diff --git a/camera/Camera.cpp b/camera/Camera.cpp
index 2244682..35b8e21 100644
--- a/camera/Camera.cpp
+++ b/camera/Camera.cpp
@@ -19,7 +19,6 @@
 #define LOG_TAG "Camera"
 #include <utils/Log.h>
 #include <utils/threads.h>
-#include <utils/String16.h>
 #include <binder/IPCThreadState.h>
 #include <binder/IServiceManager.h>
 #include <binder/IMemory.h>
@@ -70,7 +69,7 @@
     // deadlock if we call any method of ICamera here.
 }
 
-sp<Camera> Camera::connect(int cameraId, const String16& clientPackageName,
+sp<Camera> Camera::connect(int cameraId, const std::string& clientPackageName,
         int clientUid, int clientPid, int targetSdkVersion, bool overrideToPortrait,
         bool forceSlowJpegMode)
 {
diff --git a/camera/CameraBase.cpp b/camera/CameraBase.cpp
index 9ae4607..be1d4c5 100644
--- a/camera/CameraBase.cpp
+++ b/camera/CameraBase.cpp
@@ -31,6 +31,7 @@
 
 #include <camera/CameraBase.h>
 #include <camera/CameraUtils.h>
+#include <camera/StringUtils.h>
 
 // needed to instantiate
 #include <camera/Camera.h>
@@ -58,7 +59,7 @@
 }
 
 status_t CameraStatus::writeToParcel(android::Parcel* parcel) const {
-    auto res = parcel->writeString16(String16(cameraId));
+    auto res = parcel->writeString16(toString16(cameraId));
     if (res != OK) return res;
 
     res = parcel->writeInt32(status);
@@ -66,12 +67,12 @@
 
     std::vector<String16> unavailablePhysicalIds16;
     for (auto& id8 : unavailablePhysicalIds) {
-        unavailablePhysicalIds16.push_back(String16(id8));
+        unavailablePhysicalIds16.push_back(toString16(id8));
     }
     res = parcel->writeString16Vector(unavailablePhysicalIds16);
     if (res != OK) return res;
 
-    res = parcel->writeString16(String16(clientPackage));
+    res = parcel->writeString16(toString16(clientPackage));
     return res;
 }
 
@@ -79,7 +80,7 @@
     String16 tempCameraId;
     auto res = parcel->readString16(&tempCameraId);
     if (res != OK) return res;
-    cameraId = String8(tempCameraId);
+    cameraId = toString8(tempCameraId);
 
     res = parcel->readInt32(&status);
     if (res != OK) return res;
@@ -88,13 +89,13 @@
     res = parcel->readString16Vector(&unavailablePhysicalIds16);
     if (res != OK) return res;
     for (auto& id16 : unavailablePhysicalIds16) {
-        unavailablePhysicalIds.push_back(String8(id16));
+        unavailablePhysicalIds.push_back(toStdString(id16));
     }
 
     String16 tempClientPackage;
     res = parcel->readString16(&tempClientPackage);
     if (res != OK) return res;
-    clientPackage = String8(tempClientPackage);
+    clientPackage = toStdString(tempClientPackage);
 
     return res;
 }
@@ -142,7 +143,7 @@
         sp<IServiceManager> sm = defaultServiceManager();
         sp<IBinder> binder;
         do {
-            binder = sm->getService(String16(kCameraServiceName));
+            binder = sm->getService(toString16(kCameraServiceName));
             if (binder != 0) {
                 break;
             }
@@ -161,7 +162,7 @@
 
 template <typename TCam, typename TCamTraits>
 sp<TCam> CameraBase<TCam, TCamTraits>::connect(int cameraId,
-                                               const String16& clientPackageName,
+                                               const std::string& clientPackageName,
                                                int clientUid, int clientPid, int targetSdkVersion,
                                                bool overrideToPortrait, bool forceSlowJpegMode)
 {
diff --git a/camera/CameraSessionStats.cpp b/camera/CameraSessionStats.cpp
index 9e9793d..36bf24c 100644
--- a/camera/CameraSessionStats.cpp
+++ b/camera/CameraSessionStats.cpp
@@ -20,6 +20,7 @@
 #include <utils/String16.h>
 
 #include <camera/CameraSessionStats.h>
+#include <camera/StringUtils.h>
 
 #include <binder/Parcel.h>
 
@@ -282,8 +283,8 @@
         mSessionIndex(0),
         mCameraExtensionSessionStats() {}
 
-CameraSessionStats::CameraSessionStats(const String16& cameraId,
-        int facing, int newCameraState, const String16& clientName,
+CameraSessionStats::CameraSessionStats(const std::string& cameraId,
+        int facing, int newCameraState, const std::string& clientName,
         int apiLevel, bool isNdk, int32_t latencyMs, int64_t logId) :
                 mCameraId(cameraId),
                 mFacing(facing),
@@ -425,10 +426,10 @@
         return err;
     }
 
-    mCameraId = id;
+    mCameraId = toStdString(id);
     mFacing = facing;
     mNewCameraState = newCameraState;
-    mClientName = clientName;
+    mClientName = toStdString(clientName);
     mApiLevel = apiLevel;
     mIsNdk = isNdk;
     mLatencyMs = latencyMs;
@@ -440,7 +441,7 @@
     mResultErrorCount = resultErrorCount;
     mDeviceError = deviceError;
     mStreamStats = std::move(streamStats);
-    mUserTag = userTag;
+    mUserTag = toStdString(userTag);
     mVideoStabilizationMode = videoStabilizationMode;
     mSessionIndex = sessionIdx;
     mCameraExtensionSessionStats = extStats;
@@ -456,7 +457,7 @@
 
     status_t err = OK;
 
-    if ((err = parcel->writeString16(mCameraId)) != OK) {
+    if ((err = parcel->writeString16(toString16(mCameraId))) != OK) {
         ALOGE("%s: Failed to write camera id!", __FUNCTION__);
         return err;
     }
@@ -471,7 +472,7 @@
         return err;
     }
 
-    if ((err = parcel->writeString16(mClientName)) != OK) {
+    if ((err = parcel->writeString16(toString16(mClientName))) != OK) {
         ALOGE("%s: Failed to write client name!", __FUNCTION__);
         return err;
     }
@@ -531,7 +532,7 @@
         return err;
     }
 
-    if ((err = parcel->writeString16(mUserTag)) != OK) {
+    if ((err = parcel->writeString16(toString16(mUserTag))) != OK) {
         ALOGE("%s: Failed to write user tag!", __FUNCTION__);
         return err;
     }
diff --git a/camera/CaptureResult.cpp b/camera/CaptureResult.cpp
index bb880d1..9ff2578 100644
--- a/camera/CaptureResult.cpp
+++ b/camera/CaptureResult.cpp
@@ -18,6 +18,7 @@
 #include <utils/Log.h>
 
 #include <camera/CaptureResult.h>
+#include <camera/StringUtils.h>
 #include <binder/Parcel.h>
 
 namespace android {
@@ -47,7 +48,7 @@
             ALOGE("%s: Failed to read camera id: %d", __FUNCTION__, res);
             return res;
         }
-        errorPhysicalCameraId = cameraId;
+        errorPhysicalCameraId = toStdString(cameraId);
     }
     parcel->readInt64(&lastCompletedRegularFrameNumber);
     parcel->readInt64(&lastCompletedReprocessFrameNumber);
@@ -75,7 +76,7 @@
     if (errorPhysicalCameraId.size() > 0) {
         parcel->writeBool(true);
         status_t res = OK;
-        if ((res = parcel->writeString16(errorPhysicalCameraId)) != OK) {
+        if ((res = parcel->writeString16(toString16(errorPhysicalCameraId))) != OK) {
             ALOGE("%s: Failed to write physical camera ID to parcel: %d", __FUNCTION__, res);
             return res;
         }
@@ -96,13 +97,15 @@
 status_t PhysicalCaptureResultInfo::readFromParcel(const android::Parcel* parcel) {
     status_t res;
 
-    mPhysicalCameraId.setTo(u"");
+    mPhysicalCameraId = "";
     mPhysicalCameraMetadata.clear();
 
-    if ((res = parcel->readString16(&mPhysicalCameraId)) != OK) {
+    String16 physicalCameraId;
+    if ((res = parcel->readString16(&physicalCameraId)) != OK) {
         ALOGE("%s: Failed to read camera id: %d", __FUNCTION__, res);
         return res;
     }
+    mPhysicalCameraId = toStdString(physicalCameraId);
 
     if ((res = mPhysicalCameraMetadata.readFromParcel(parcel)) != OK) {
         ALOGE("%s: Failed to read metadata from parcel: %d", __FUNCTION__, res);
@@ -113,7 +116,7 @@
 
 status_t PhysicalCaptureResultInfo::writeToParcel(android::Parcel* parcel) const {
     status_t res;
-    if ((res = parcel->writeString16(mPhysicalCameraId)) != OK) {
+    if ((res = parcel->writeString16(toString16(mPhysicalCameraId))) != OK) {
         ALOGE("%s: Failed to write physical camera ID to parcel: %d",
                 __FUNCTION__, res);
         return res;
@@ -187,7 +190,8 @@
             return res;
         }
 
-        mPhysicalMetadatas.emplace(mPhysicalMetadatas.end(), cameraId, physicalMetadata);
+        mPhysicalMetadatas.emplace(mPhysicalMetadatas.end(), toStdString(cameraId),
+                physicalMetadata);
     }
     ALOGV("%s: Read physical metadata from parcel", __FUNCTION__);
 
@@ -228,7 +232,7 @@
         return BAD_VALUE;
     }
     for (const auto& physicalMetadata : mPhysicalMetadatas) {
-        if ((res = parcel->writeString16(physicalMetadata.mPhysicalCameraId)) != OK) {
+        if ((res = parcel->writeString16(toString16(physicalMetadata.mPhysicalCameraId))) != OK) {
             ALOGE("%s: Failed to write physical camera ID to parcel: %d",
                     __FUNCTION__, res);
             return res;
diff --git a/camera/aidl/android/hardware/ICameraService.aidl b/camera/aidl/android/hardware/ICameraService.aidl
index f8e1631..ed37b2d 100644
--- a/camera/aidl/android/hardware/ICameraService.aidl
+++ b/camera/aidl/android/hardware/ICameraService.aidl
@@ -82,7 +82,7 @@
      */
     ICamera connect(ICameraClient client,
             int cameraId,
-            String opPackageName,
+            @utf8InCpp String opPackageName,
             int clientUid, int clientPid,
             int targetSdkVersion,
             boolean overrideToPortrait,
@@ -93,9 +93,9 @@
      * Only supported for device HAL versions >= 3.2
      */
     ICameraDeviceUser connectDevice(ICameraDeviceCallbacks callbacks,
-            String cameraId,
-            String opPackageName,
-            @nullable String featureId,
+            @utf8InCpp String cameraId,
+            @utf8InCpp String opPackageName,
+            @nullable @utf8InCpp String featureId,
             int clientUid, int oomScoreOffset,
             int targetSdkVersion,
             boolean overrideToPortrait);
@@ -139,7 +139,7 @@
      * Read the static camera metadata for a camera device.
      * Only supported for device HAL versions >= 3.2
      */
-    CameraMetadataNative getCameraCharacteristics(String cameraId, int targetSdkVersion,
+    CameraMetadataNative getCameraCharacteristics(@utf8InCpp String cameraId, int targetSdkVersion,
             boolean overrideToPortrait);
 
     /**
@@ -160,7 +160,7 @@
     /**
      * Read the legacy camera1 parameters into a String
      */
-    String getLegacyParameters(int cameraId);
+    @utf8InCpp String getLegacyParameters(int cameraId);
 
     /**
      * apiVersion constants for supportsCameraApi
@@ -169,21 +169,21 @@
     const int API_VERSION_2 = 2;
 
     // Determines if a particular API version is supported directly for a cameraId.
-    boolean supportsCameraApi(String cameraId, int apiVersion);
+    boolean supportsCameraApi(@utf8InCpp String cameraId, int apiVersion);
     // Determines if a cameraId is a hidden physical camera of a logical multi-camera.
-    boolean isHiddenPhysicalCamera(String cameraId);
+    boolean isHiddenPhysicalCamera(@utf8InCpp String cameraId);
     // Inject the external camera to replace the internal camera session.
-    ICameraInjectionSession injectCamera(String packageName, String internalCamId,
-            String externalCamId, in ICameraInjectionCallback CameraInjectionCallback);
+    ICameraInjectionSession injectCamera(@utf8InCpp String packageName, @utf8InCpp String internalCamId,
+            @utf8InCpp String externalCamId, in ICameraInjectionCallback CameraInjectionCallback);
 
-    void setTorchMode(String cameraId, boolean enabled, IBinder clientBinder);
+    void setTorchMode(@utf8InCpp String cameraId, boolean enabled, IBinder clientBinder);
 
     // Change the brightness level of the flash unit associated with cameraId to strengthLevel.
     // If the torch is in OFF state and strengthLevel > 0 then the torch will also be turned ON.
-    void turnOnTorchWithStrengthLevel(String cameraId, int strengthLevel, IBinder clientBinder);
+    void turnOnTorchWithStrengthLevel(@utf8InCpp String cameraId, int strengthLevel, IBinder clientBinder);
 
     // Get the brightness level of the flash unit associated with cameraId.
-    int getTorchStrengthLevel(String cameraId);
+    int getTorchStrengthLevel(@utf8InCpp String cameraId);
 
     /**
      * Notify the camera service of a system event.  Should only be called from system_server.
@@ -233,7 +233,7 @@
      *
      * @return the key that must be used to report updates to previously reported stats.
      */
-    String reportExtensionSessionStats(in CameraExtensionSessionStats stats);
+    @utf8InCpp String reportExtensionSessionStats(in CameraExtensionSessionStats stats);
 
     // Bitfield constants for notifyDeviceStateChange
     // All bits >= 32 are for custom vendor states
diff --git a/camera/aidl/android/hardware/ICameraServiceListener.aidl b/camera/aidl/android/hardware/ICameraServiceListener.aidl
index 5f17f5b..23a87d3 100644
--- a/camera/aidl/android/hardware/ICameraServiceListener.aidl
+++ b/camera/aidl/android/hardware/ICameraServiceListener.aidl
@@ -51,13 +51,14 @@
     // Use to initialize variables only
     const int STATUS_UNKNOWN          = -1;
 
-    oneway void onStatusChanged(int status, String cameraId);
+    oneway void onStatusChanged(int status, @utf8InCpp String cameraId);
 
     /**
      * Notify registered client about status changes for a physical camera backing
      * a logical camera.
      */
-    oneway void onPhysicalCameraStatusChanged(int status, String cameraId, String physicalCameraId);
+    oneway void onPhysicalCameraStatusChanged(int status, @utf8InCpp String cameraId,
+            @utf8InCpp String physicalCameraId);
 
     /**
      * The torch mode status of a camera.
@@ -81,9 +82,9 @@
     // Use to initialize variables only
     const int TORCH_STATUS_UNKNOWN = -1;
 
-    oneway void onTorchStatusChanged(int status, String cameraId);
+    oneway void onTorchStatusChanged(int status, @utf8InCpp String cameraId);
 
-    oneway void onTorchStrengthLevelChanged(String cameraId, int newTorchStrength);
+    oneway void onTorchStrengthLevelChanged(@utf8InCpp String cameraId, int newTorchStrength);
 
     /**
      * Notify registered clients about camera access priority changes.
@@ -97,6 +98,6 @@
      * Only clients with android.permission.CAMERA_OPEN_CLOSE_LISTENER permission
      * will receive such callbacks.
      */
-    oneway void onCameraOpened(String cameraId, String clientPackageId);
-    oneway void onCameraClosed(String cameraId);
+    oneway void onCameraOpened(@utf8InCpp String cameraId, @utf8InCpp String clientPackageId);
+    oneway void onCameraClosed(@utf8InCpp String cameraId);
 }
diff --git a/camera/aidl/android/hardware/ICameraServiceProxy.aidl b/camera/aidl/android/hardware/ICameraServiceProxy.aidl
index 4faa6b4..dcd69b0 100644
--- a/camera/aidl/android/hardware/ICameraServiceProxy.aidl
+++ b/camera/aidl/android/hardware/ICameraServiceProxy.aidl
@@ -44,14 +44,14 @@
      * {@link android.hardware.camera2.CameraMetadata#SCALER_ROTATE_AND_CROP_180},
      * {@link android.hardware.camera2.CameraMetadata#SCALER_ROTATE_AND_CROP_270}).
      */
-    int getRotateAndCropOverride(String packageName, int lensFacing, int userId);
+    int getRotateAndCropOverride(@utf8InCpp String packageName, int lensFacing, int userId);
 
     /**
      * Returns the necessary autoframing override for the top activity which
      * will be one of ({@link android.hardware.camera2.CameraMetadata#AUTOFRAMING_FALSE},
      * {@link android.hardware.camera2.CameraMetadata#AUTOFRAMING_TRUE}).
      */
-    int getAutoframingOverride(String packageName);
+    int getAutoframingOverride(@utf8InCpp String packageName);
 
     /**
      * Checks if the camera has been disabled via device policy.
diff --git a/camera/camera2/CaptureRequest.cpp b/camera/camera2/CaptureRequest.cpp
index 7a8a4ba..071f34e 100644
--- a/camera/camera2/CaptureRequest.cpp
+++ b/camera/camera2/CaptureRequest.cpp
@@ -21,6 +21,7 @@
 #include <utils/String16.h>
 
 #include <camera/camera2/CaptureRequest.h>
+#include <camera/StringUtils.h>
 
 #include <binder/Parcel.h>
 #include <gui/Surface.h>
@@ -74,7 +75,7 @@
             return err;
         }
         ALOGV("%s: Read metadata from parcel", __FUNCTION__);
-        mPhysicalCameraSettings.push_back({std::string(String8(id).string()), settings});
+        mPhysicalCameraSettings.push_back({toStdString(id), settings});
     }
 
     int isReprocess = 0;
@@ -157,7 +158,7 @@
             ALOGE("%s: Failed to read user tag!", __FUNCTION__);
             return BAD_VALUE;
         }
-        mUserTag = String8(userTag).c_str();
+        mUserTag = toStdString(userTag);
     }
 
     return OK;
@@ -179,7 +180,7 @@
     }
 
     for (const auto &it : mPhysicalCameraSettings) {
-        if ((err = parcel->writeString16(String16(it.id.c_str()))) != OK) {
+        if ((err = parcel->writeString16(toString16(it.id))) != OK) {
             ALOGE("%s: Failed to camera id!", __FUNCTION__);
             return err;
         }
@@ -232,7 +233,7 @@
         parcel->writeInt32(0);
     } else {
         parcel->writeInt32(1);
-        parcel->writeString16(String16(mUserTag.c_str()));
+        parcel->writeString16(toString16(mUserTag));
     }
 
     return OK;
diff --git a/camera/camera2/ConcurrentCamera.cpp b/camera/camera2/ConcurrentCamera.cpp
index 01a695c..67aa876 100644
--- a/camera/camera2/ConcurrentCamera.cpp
+++ b/camera/camera2/ConcurrentCamera.cpp
@@ -20,6 +20,7 @@
 #include <utils/String16.h>
 
 #include <camera/camera2/ConcurrentCamera.h>
+#include <camera/StringUtils.h>
 
 #include <binder/Parcel.h>
 
@@ -53,7 +54,7 @@
             ALOGE("%s: Failed to read camera id!", __FUNCTION__);
             return err;
         }
-        mConcurrentCameraIds.push_back(std::string(String8(id).string()));
+        mConcurrentCameraIds.push_back(toStdString(id));
     }
     return OK;
 }
@@ -73,7 +74,7 @@
     }
 
     for (const auto &it : mConcurrentCameraIds) {
-        if ((err = parcel->writeString16(String16(it.c_str()))) != OK) {
+        if ((err = parcel->writeString16(toString16(it))) != OK) {
             ALOGE("%s: Failed to write the camera id string to parcel: %d", __FUNCTION__, err);
             return err;
         }
@@ -99,7 +100,7 @@
         ALOGE("%s: Failed to read sessionConfiguration!", __FUNCTION__);
         return err;
     }
-    mCameraId = std::string(String8(id).string());
+    mCameraId = toStdString(id);
     return OK;
 }
 
@@ -111,7 +112,7 @@
     }
 
     status_t err = OK;
-    if ((err = parcel->writeString16(String16(mCameraId.c_str()))) != OK) {
+    if ((err = parcel->writeString16(toString16(mCameraId))) != OK) {
         ALOGE("%s: Failed to write camera id!", __FUNCTION__);
         return err;
     }
diff --git a/camera/camera2/OutputConfiguration.cpp b/camera/camera2/OutputConfiguration.cpp
index da4484a..33220ce 100644
--- a/camera/camera2/OutputConfiguration.cpp
+++ b/camera/camera2/OutputConfiguration.cpp
@@ -21,6 +21,7 @@
 #include <utils/Log.h>
 
 #include <camera/camera2/OutputConfiguration.h>
+#include <camera/StringUtils.h>
 #include <binder/Parcel.h>
 #include <gui/view/Surface.h>
 #include <system/camera_metadata.h>
@@ -65,7 +66,7 @@
     return mIsShared;
 }
 
-String16 OutputConfiguration::getPhysicalCameraId() const {
+std::string OutputConfiguration::getPhysicalCameraId() const {
     return mPhysicalCameraId;
 }
 
@@ -183,7 +184,9 @@
         return err;
     }
 
-    parcel->readString16(&mPhysicalCameraId);
+    String16 physicalCameraId;
+    parcel->readString16(&physicalCameraId);
+    mPhysicalCameraId = toStdString(physicalCameraId);
 
     int isMultiResolution = 0;
     if ((err = parcel->readInt32(&isMultiResolution)) != OK) {
@@ -246,7 +249,7 @@
     for (auto& surface : surfaceShims) {
         ALOGV("%s: OutputConfiguration: %p, name %s", __FUNCTION__,
                 surface.graphicBufferProducer.get(),
-                String8(surface.name).string());
+                toString8(surface.name).string());
         mGbps.push_back(surface.graphicBufferProducer);
     }
 
@@ -258,14 +261,14 @@
           " physicalCameraId = %s, isMultiResolution = %d, streamUseCase = %" PRId64
           ", timestampBase = %d, mirrorMode = %d, useReadoutTimestamp = %d",
           __FUNCTION__, mRotation, mSurfaceSetID, mSurfaceType,
-          String8(mPhysicalCameraId).string(), mIsMultiResolution, mStreamUseCase, timestampBase,
+          mPhysicalCameraId.c_str(), mIsMultiResolution, mStreamUseCase, timestampBase,
           mMirrorMode, mUseReadoutTimestamp);
 
     return err;
 }
 
 OutputConfiguration::OutputConfiguration(sp<IGraphicBufferProducer>& gbp, int rotation,
-        const String16& physicalId,
+        const std::string& physicalId,
         int surfaceSetID, bool isShared) {
     mGbps.push_back(gbp);
     mRotation = rotation;
@@ -284,7 +287,7 @@
 
 OutputConfiguration::OutputConfiguration(
         const std::vector<sp<IGraphicBufferProducer>>& gbps,
-    int rotation, const String16& physicalCameraId, int surfaceSetID,  int surfaceType,
+    int rotation, const std::string& physicalCameraId, int surfaceSetID,  int surfaceType,
     int width, int height, bool isShared)
   : mGbps(gbps), mRotation(rotation), mSurfaceSetID(surfaceSetID), mSurfaceType(surfaceType),
     mWidth(width), mHeight(height), mIsDeferred(false), mIsShared(isShared),
@@ -331,7 +334,8 @@
     err = parcel->writeParcelableVector(surfaceShims);
     if (err != OK) return err;
 
-    err = parcel->writeString16(mPhysicalCameraId);
+    String16 physicalCameraId = toString16(mPhysicalCameraId);
+    err = parcel->writeString16(physicalCameraId);
     if (err != OK) return err;
 
     err = parcel->writeInt32(mIsMultiResolution ? 1 : 0);
diff --git a/camera/include/camera/Camera.h b/camera/include/camera/Camera.h
index 21b57af..6655f82 100644
--- a/camera/include/camera/Camera.h
+++ b/camera/include/camera/Camera.h
@@ -56,9 +56,9 @@
     typedef CameraListener                     TCamListener;
     typedef ::android::hardware::ICamera       TCamUser;
     typedef ::android::hardware::ICameraClient TCamCallbacks;
-    typedef ::android::binder::Status(::android::hardware::ICameraService::*TCamConnectService)
+    typedef ::android::binder::Status (::android::hardware::ICameraService::*TCamConnectService)
         (const sp<::android::hardware::ICameraClient>&,
-        int, const String16&, int, int, int, bool, bool,
+        int, const std::string&, int, int, int, bool, bool,
         /*out*/
         sp<::android::hardware::ICamera>*);
     static TCamConnectService     fnConnectService;
@@ -80,7 +80,7 @@
             // construct a camera client from an existing remote
     static  sp<Camera>  create(const sp<::android::hardware::ICamera>& camera);
     static  sp<Camera>  connect(int cameraId,
-                                const String16& clientPackageName,
+                                const std::string& clientPackageName,
                                 int clientUid, int clientPid, int targetSdkVersion,
                                 bool overrideToPortrait, bool forceSlowJpegMode);
 
diff --git a/camera/include/camera/CameraBase.h b/camera/include/camera/CameraBase.h
index b20dc1b..6af7f2a 100644
--- a/camera/include/camera/CameraBase.h
+++ b/camera/include/camera/CameraBase.h
@@ -73,7 +73,7 @@
     /**
      * The name of the camera device
      */
-    String8 cameraId;
+    std::string cameraId;
 
     /**
      * Its current status, one of the ICameraService::STATUS_* fields
@@ -83,18 +83,18 @@
     /**
      * Unavailable physical camera names for a multi-camera device
      */
-    std::vector<String8> unavailablePhysicalIds;
+    std::vector<std::string> unavailablePhysicalIds;
 
     /**
      * Client package name if camera is open, otherwise not applicable
      */
-    String8 clientPackage;
+    std::string clientPackage;
 
     virtual status_t writeToParcel(android::Parcel* parcel) const;
     virtual status_t readFromParcel(const android::Parcel* parcel);
 
-    CameraStatus(String8 id, int32_t s, const std::vector<String8>& unavailSubIds,
-            const String8& clientPkg) : cameraId(id), status(s),
+    CameraStatus(std::string id, int32_t s, const std::vector<std::string>& unavailSubIds,
+            const std::string& clientPkg) : cameraId(id), status(s),
             unavailablePhysicalIds(unavailSubIds), clientPackage(clientPkg) {}
     CameraStatus() : status(ICameraServiceListener::STATUS_PRESENT) {}
 };
@@ -118,7 +118,7 @@
     typedef typename TCamTraits::TCamConnectService TCamConnectService;
 
     static sp<TCam>      connect(int cameraId,
-                                 const String16& clientPackageName,
+                                 const std::string& clientPackageName,
                                  int clientUid, int clientPid, int targetSdkVersion,
                                  bool overrideToPortrait, bool forceSlowJpegMode);
     virtual void         disconnect();
diff --git a/camera/include/camera/CameraSessionStats.h b/camera/include/camera/CameraSessionStats.h
index 071bc73..70ca0b3 100644
--- a/camera/include/camera/CameraSessionStats.h
+++ b/camera/include/camera/CameraSessionStats.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_HARDWARE_CAMERA_SERVICE_SESSION_STATS_H
 #define ANDROID_HARDWARE_CAMERA_SERVICE_SESSION_STATS_H
 
+#include <string>
+
 #include <binder/Parcelable.h>
 
 #include <camera/CameraMetadata.h>
@@ -121,10 +123,10 @@
     static const int CAMERA_API_LEVEL_1;
     static const int CAMERA_API_LEVEL_2;
 
-    String16 mCameraId;
+    std::string mCameraId;
     int mFacing;
     int mNewCameraState;
-    String16 mClientName;
+    std::string mClientName;
     int mApiLevel;
     bool mIsNdk;
     // latency in ms for camera open, close, or session creation.
@@ -157,7 +159,7 @@
     // Whether the device runs into an error state
     bool mDeviceError;
     std::vector<CameraStreamStats> mStreamStats;
-    String16 mUserTag;
+    std::string mUserTag;
     int mVideoStabilizationMode;
     int mSessionIndex;
 
@@ -165,8 +167,8 @@
 
     // Constructors
     CameraSessionStats();
-    CameraSessionStats(const String16& cameraId, int facing, int newCameraState,
-                       const String16& clientName, int apiLevel, bool isNdk, int32_t latencyMs,
+    CameraSessionStats(const std::string& cameraId, int facing, int newCameraState,
+                       const std::string& clientName, int apiLevel, bool isNdk, int32_t latencyMs,
                        int64_t logId);
 
     virtual status_t readFromParcel(const android::Parcel* parcel) override;
diff --git a/camera/include/camera/CaptureResult.h b/camera/include/camera/CaptureResult.h
index de534ab..e08c9ca 100644
--- a/camera/include/camera/CaptureResult.h
+++ b/camera/include/camera/CaptureResult.h
@@ -74,7 +74,7 @@
      * a reference to physical camera device.
      * Empty otherwise.
      */
-    String16  errorPhysicalCameraId;
+    std::string errorPhysicalCameraId;
 
     // The last completed frame numbers shouldn't be checked in onResultReceived() and notifyError()
     // because the output buffers could be arriving after onResultReceived() and
@@ -150,13 +150,13 @@
         : mPhysicalCameraId(),
           mPhysicalCameraMetadata() {
     }
-    PhysicalCaptureResultInfo(const String16& cameraId,
+    PhysicalCaptureResultInfo(const std::string& cameraId,
             const CameraMetadata& cameraMetadata)
             : mPhysicalCameraId(cameraId),
               mPhysicalCameraMetadata(cameraMetadata) {
     }
 
-    String16  mPhysicalCameraId;
+    std::string mPhysicalCameraId;
     CameraMetadata mPhysicalCameraMetadata;
 
     virtual status_t                readFromParcel(const android::Parcel* parcel) override;
diff --git a/camera/include/camera/StringUtils.h b/camera/include/camera/StringUtils.h
new file mode 100644
index 0000000..b9dfbfc
--- /dev/null
+++ b/camera/include/camera/StringUtils.h
@@ -0,0 +1,82 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_SERVERS_CAMERA_STRINGUTILS_H
+#define ANDROID_SERVERS_CAMERA_STRINGUTILS_H
+
+#include <codecvt>
+#include <locale>
+#include <memory>
+#include <optional>
+#include <string>
+
+#include <fmt/printf.h>
+#include <utils/String8.h>
+#include <utils/String16.h>
+
+namespace android {
+    inline String8 toString8(const std::string &str) {
+        return String8(str.c_str());
+    }
+
+    inline String8 toString8(const String16 &str) {
+        return String8(str);
+    }
+
+    inline String8 toString8(const char *str) {
+        return String8(str);
+    }
+
+    inline String16 toString16(const std::string &str) {
+        return String16(str.c_str());
+    }
+
+    inline String16 toString16(const String8 &str) {
+        return String16(str);
+    }
+
+    inline String16 toString16(const char *str) {
+        return String16(str);
+    }
+
+    inline std::optional<String16> toString16(std::optional<std::string> str) {
+        if (str.has_value()) {
+            return std::optional<String16>(toString16(str.value()));
+        }
+
+        return std::nullopt;
+    }
+
+    inline std::string toStdString(const String8 &str) {
+        return std::string(str.string());
+    }
+
+    inline std::string toStdString(const String16 &str) {
+        std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
+        return convert.to_bytes(str.string());
+    }
+
+    /**
+     * Convert a non-null-terminated UTF16 string to a UTF8 string (i.e. in jni functions)
+     * len is the number of characters.
+     */
+    inline std::string toStdString(const char16_t *str, size_t len) {
+        std::wstring_convert<std::codecvt_utf8_utf16<char16_t>, char16_t> convert;
+        return convert.to_bytes(str, str + len);
+    }
+} // namespace android
+
+#endif // ANDROID_SERVERS_CAMERA_STRINGUTILS_H
diff --git a/camera/include/camera/camera2/OutputConfiguration.h b/camera/include/camera/camera2/OutputConfiguration.h
index 16fddb5..3f74b4a 100644
--- a/camera/include/camera/camera2/OutputConfiguration.h
+++ b/camera/include/camera/camera2/OutputConfiguration.h
@@ -17,6 +17,8 @@
 #ifndef ANDROID_HARDWARE_CAMERA2_OUTPUTCONFIGURATION_H
 #define ANDROID_HARDWARE_CAMERA2_OUTPUTCONFIGURATION_H
 
+#include <string>
+
 #include <gui/IGraphicBufferProducer.h>
 #include <binder/Parcelable.h>
 
@@ -63,7 +65,7 @@
     int32_t                    getColorSpace() const;
     bool                       isDeferred() const;
     bool                       isShared() const;
-    String16                   getPhysicalCameraId() const;
+    std::string                getPhysicalCameraId() const;
     bool                       isMultiResolution() const;
     int64_t                    getStreamUseCase() const;
     int                        getTimestampBase() const;
@@ -90,11 +92,11 @@
     OutputConfiguration(const android::Parcel& parcel);
 
     OutputConfiguration(sp<IGraphicBufferProducer>& gbp, int rotation,
-            const String16& physicalCameraId,
+            const std::string& physicalCameraId,
             int surfaceSetID = INVALID_SET_ID, bool isShared = false);
 
     OutputConfiguration(const std::vector<sp<IGraphicBufferProducer>>& gbps,
-                        int rotation, const String16& physicalCameraId,
+                        int rotation, const std::string& physicalCameraId,
                         int surfaceSetID = INVALID_SET_ID,
                         int surfaceType = OutputConfiguration::SURFACE_TYPE_UNKNOWN, int width = 0,
                         int height = 0, bool isShared = false);
@@ -192,7 +194,7 @@
     int                        mHeight;
     bool                       mIsDeferred;
     bool                       mIsShared;
-    String16                   mPhysicalCameraId;
+    std::string                mPhysicalCameraId;
     bool                       mIsMultiResolution;
     std::vector<int32_t>       mSensorPixelModesUsed;
     int64_t                    mDynamicRangeProfile;
diff --git a/camera/ndk/impl/ACameraDevice.cpp b/camera/ndk/impl/ACameraDevice.cpp
index 1dae0f9..8bdb6d4 100644
--- a/camera/ndk/impl/ACameraDevice.cpp
+++ b/camera/ndk/impl/ACameraDevice.cpp
@@ -21,6 +21,7 @@
 #include <inttypes.h>
 #include <android/hardware/ICameraService.h>
 #include <gui/Surface.h>
+#include <camera/StringUtils.h>
 #include "ACameraDevice.h"
 #include "ACameraMetadata.h"
 #include "ACaptureRequest.h"
@@ -234,8 +235,7 @@
             return ret;
         }
 
-        String16 physicalId16(output.mPhysicalCameraId.c_str());
-        OutputConfiguration outConfig(iGBP, output.mRotation, physicalId16,
+        OutputConfiguration outConfig(iGBP, output.mRotation, output.mPhysicalCameraId,
                 OutputConfiguration::INVALID_SET_ID, true);
 
         for (auto& anw : output.mSharedWindows) {
@@ -299,8 +299,7 @@
         return ret;
     }
 
-    String16 physicalId16(output->mPhysicalCameraId.c_str());
-    OutputConfiguration outConfig(iGBP, output->mRotation, physicalId16,
+    OutputConfiguration outConfig(iGBP, output->mRotation, output->mPhysicalCameraId,
             OutputConfiguration::INVALID_SET_ID, true);
 
     for (auto& anw : output->mSharedWindows) {
@@ -683,9 +682,8 @@
         if (ret != ACAMERA_OK) {
             return ret;
         }
-        String16 physicalId16(outConfig.mPhysicalCameraId.c_str());
         outputSet.insert(std::make_pair(
-                anw, OutputConfiguration(iGBP, outConfig.mRotation, physicalId16,
+                anw, OutputConfiguration(iGBP, outConfig.mRotation, outConfig.mPhysicalCameraId,
                         OutputConfiguration::INVALID_SET_ID, outConfig.mIsShared)));
     }
     auto addSet = outputSet;
@@ -919,7 +917,7 @@
         msg->setObject(kSessionSpKey, session);
         if (cbh.mIsLogicalCameraCallback) {
             if (resultExtras.errorPhysicalCameraId.size() > 0) {
-                String8 cameraId(resultExtras.errorPhysicalCameraId);
+                String8 cameraId = toString8(resultExtras.errorPhysicalCameraId);
                 msg->setString(kFailingPhysicalCameraId, cameraId.string(), cameraId.size());
             }
             msg->setPointer(kCallbackFpKey, (void*) cbh.mOnLogicalCameraCaptureFailed);
@@ -1215,7 +1213,7 @@
                     std::vector<std::string> physicalCameraIds;
                     std::vector<sp<ACameraMetadata>> physicalMetadataCopy;
                     for (size_t i = 0; i < physicalResultInfo.size(); i++) {
-                        String8 physicalId8(physicalResultInfo[i].mPhysicalCameraId);
+                        String8 physicalId8 = toString8(physicalResultInfo[i].mPhysicalCameraId);
                         physicalCameraIds.push_back(physicalId8.c_str());
 
                         CameraMetadata clone = physicalResultInfo[i].mPhysicalCameraMetadata;
diff --git a/camera/ndk/impl/ACameraManager.cpp b/camera/ndk/impl/ACameraManager.cpp
index 837b5be..299ffc0 100644
--- a/camera/ndk/impl/ACameraManager.cpp
+++ b/camera/ndk/impl/ACameraManager.cpp
@@ -25,6 +25,7 @@
 #include <cutils/properties.h>
 #include <stdlib.h>
 #include <camera/CameraUtils.h>
+#include <camera/StringUtils.h>
 #include <camera/VendorTagDescriptor.h>
 
 using namespace android::acam;
@@ -84,7 +85,7 @@
         sp<IServiceManager> sm = defaultServiceManager();
         sp<IBinder> binder;
         do {
-            binder = sm->getService(String16(kCameraServiceName));
+            binder = sm->getService(toString16(kCameraServiceName));
             if (binder != nullptr) {
                 break;
             }
@@ -188,12 +189,12 @@
     sp<CameraManagerGlobal> cm = mCameraManager.promote();
     if (cm != nullptr) {
         AutoMutex lock(cm->mLock);
-        std::vector<String8> cameraIdList;
+        std::vector<std::string> cameraIdList;
         for (auto& pair : cm->mDeviceStatusMap) {
             cameraIdList.push_back(pair.first);
         }
 
-        for (String8 cameraId : cameraIdList) {
+        for (const std::string& cameraId : cameraIdList) {
             cm->onStatusChangedLocked(
                     CameraServiceListener::STATUS_NOT_PRESENT, cameraId);
         }
@@ -259,7 +260,7 @@
     // Send initial callbacks if callback is newly registered
     if (pair.second) {
         for (auto& pair : mDeviceStatusMap) {
-            const String8& cameraId = pair.first;
+            const std::string& cameraId = pair.first;
             int32_t status = pair.second.getStatus();
             // Don't send initial callbacks for camera ids which don't support
             // camera2
@@ -273,12 +274,12 @@
                     cb.mAvailable : cb.mUnavailable;
             msg->setPointer(kCallbackFpKey, (void *) cbFunc);
             msg->setPointer(kContextKey, cb.mContext);
-            msg->setString(kCameraIdKey, AString(cameraId));
+            msg->setString(kCameraIdKey, AString(cameraId.c_str()));
             mPendingCallbackCnt++;
             msg->post();
 
             // Physical camera unavailable callback
-            std::set<String8> unavailablePhysicalCameras =
+            std::set<std::string> unavailablePhysicalCameras =
                     pair.second.getUnavailablePhysicalIds();
             for (const auto& physicalCameraId : unavailablePhysicalCameras) {
                 sp<AMessage> msg = new AMessage(kWhatSendSinglePhysicalCameraCallback, mHandler);
@@ -286,8 +287,8 @@
                         cb.mPhysicalCamUnavailable;
                 msg->setPointer(kCallbackFpKey, (void *) cbFunc);
                 msg->setPointer(kContextKey, cb.mContext);
-                msg->setString(kCameraIdKey, AString(cameraId));
-                msg->setString(kPhysicalCameraIdKey, AString(physicalCameraId));
+                msg->setString(kCameraIdKey, AString(cameraId.c_str()));
+                msg->setString(kPhysicalCameraIdKey, AString(physicalCameraId.c_str()));
                 mPendingCallbackCnt++;
                 msg->post();
             }
@@ -295,11 +296,11 @@
     }
 }
 
-bool CameraManagerGlobal::supportsCamera2ApiLocked(const String8 &cameraId) {
+bool CameraManagerGlobal::supportsCamera2ApiLocked(const std::string &cameraId) {
     bool camera2Support = false;
     auto cs = getCameraServiceLocked();
     binder::Status serviceRet =
-        cs->supportsCameraApi(String16(cameraId),
+        cs->supportsCameraApi(cameraId,
                 hardware::ICameraService::API_VERSION_2, &camera2Support);
     if (!serviceRet.isOk()) {
         ALOGE("%s: supportsCameraApi2Locked() call failed for cameraId  %s",
@@ -309,7 +310,7 @@
     return camera2Support;
 }
 
-void CameraManagerGlobal::getCameraIdList(std::vector<String8>* cameraIds) {
+void CameraManagerGlobal::getCameraIdList(std::vector<std::string>* cameraIds) {
     // Ensure that we have initialized/refreshed the list of available devices
     Mutex::Autolock _l(mLock);
     // Needed to make sure we're connected to cameraservice
@@ -459,10 +460,10 @@
 }
 
 binder::Status CameraManagerGlobal::CameraServiceListener::onStatusChanged(
-        int32_t status, const String16& cameraId) {
+        int32_t status, const std::string& cameraId) {
     sp<CameraManagerGlobal> cm = mCameraManager.promote();
     if (cm != nullptr) {
-        cm->onStatusChanged(status, String8(cameraId));
+        cm->onStatusChanged(status, cameraId);
     } else {
         ALOGE("Cannot deliver status change. Global camera manager died");
     }
@@ -470,10 +471,10 @@
 }
 
 binder::Status CameraManagerGlobal::CameraServiceListener::onPhysicalCameraStatusChanged(
-        int32_t status, const String16& cameraId, const String16& physicalCameraId) {
+        int32_t status, const std::string& cameraId, const std::string& physicalCameraId) {
     sp<CameraManagerGlobal> cm = mCameraManager.promote();
     if (cm != nullptr) {
-        cm->onStatusChanged(status, String8(cameraId), String8(physicalCameraId));
+        cm->onStatusChanged(status, cameraId, physicalCameraId);
     } else {
         ALOGE("Cannot deliver physical camera status change. Global camera manager died");
     }
@@ -495,13 +496,13 @@
 }
 
 void CameraManagerGlobal::onStatusChanged(
-        int32_t status, const String8& cameraId) {
+        int32_t status, const std::string& cameraId) {
     Mutex::Autolock _l(mLock);
     onStatusChangedLocked(status, cameraId);
 }
 
 void CameraManagerGlobal::onStatusChangedLocked(
-        int32_t status, const String8& cameraId) {
+        int32_t status, const std::string& cameraId) {
     if (!validStatus(status)) {
         ALOGE("%s: Invalid status %d", __FUNCTION__, status);
         return;
@@ -534,7 +535,7 @@
                     cb.mAvailable : cb.mUnavailable;
             msg->setPointer(kCallbackFpKey, (void *) cbFp);
             msg->setPointer(kContextKey, cb.mContext);
-            msg->setString(kCameraIdKey, AString(cameraId));
+            msg->setString(kCameraIdKey, AString(cameraId.c_str()));
             mPendingCallbackCnt++;
             msg->post();
         }
@@ -545,13 +546,13 @@
 }
 
 void CameraManagerGlobal::onStatusChanged(
-        int32_t status, const String8& cameraId, const String8& physicalCameraId) {
+        int32_t status, const std::string& cameraId, const std::string& physicalCameraId) {
     Mutex::Autolock _l(mLock);
     onStatusChangedLocked(status, cameraId, physicalCameraId);
 }
 
 void CameraManagerGlobal::onStatusChangedLocked(
-        int32_t status, const String8& cameraId, const String8& physicalCameraId) {
+        int32_t status, const std::string& cameraId, const std::string& physicalCameraId) {
     if (!validStatus(status)) {
         ALOGE("%s: Invalid status %d", __FUNCTION__, status);
         return;
@@ -567,7 +568,7 @@
     if (logicalCamStatus != hardware::ICameraServiceListener::STATUS_PRESENT &&
             logicalCamStatus != hardware::ICameraServiceListener::STATUS_NOT_AVAILABLE) {
         ALOGE("%s: Physical camera id %s status %d change for an invalid logical camera state %d",
-                __FUNCTION__, physicalCameraId.string(), status, logicalCamStatus);
+                __FUNCTION__, physicalCameraId.c_str(), status, logicalCamStatus);
         return;
     }
 
@@ -588,8 +589,8 @@
                     cb.mPhysicalCamAvailable : cb.mPhysicalCamUnavailable;
             msg->setPointer(kCallbackFpKey, (void *) cbFp);
             msg->setPointer(kContextKey, cb.mContext);
-            msg->setString(kCameraIdKey, AString(cameraId));
-            msg->setString(kPhysicalCameraIdKey, AString(physicalCameraId));
+            msg->setString(kCameraIdKey, AString(cameraId.c_str()));
+            msg->setString(kPhysicalCameraIdKey, AString(physicalCameraId.c_str()));
             mPendingCallbackCnt++;
             msg->post();
         }
@@ -607,20 +608,20 @@
 }
 
 bool CameraManagerGlobal::StatusAndHAL3Support::addUnavailablePhysicalId(
-        const String8& physicalCameraId) {
+        const std::string& physicalCameraId) {
     std::lock_guard<std::mutex> lock(mLock);
     auto result = unavailablePhysicalIds.insert(physicalCameraId);
     return result.second;
 }
 
 bool CameraManagerGlobal::StatusAndHAL3Support::removeUnavailablePhysicalId(
-        const String8& physicalCameraId) {
+        const std::string& physicalCameraId) {
     std::lock_guard<std::mutex> lock(mLock);
     auto count = unavailablePhysicalIds.erase(physicalCameraId);
     return count > 0;
 }
 
-std::set<String8> CameraManagerGlobal::StatusAndHAL3Support::getUnavailablePhysicalIds() {
+std::set<std::string> CameraManagerGlobal::StatusAndHAL3Support::getUnavailablePhysicalIds() {
     std::lock_guard<std::mutex> lock(mLock);
     return unavailablePhysicalIds;
 }
@@ -635,7 +636,7 @@
 ACameraManager::getCameraIdList(ACameraIdList** cameraIdList) {
     Mutex::Autolock _l(mLock);
 
-    std::vector<String8> idList;
+    std::vector<std::string> idList;
     CameraManagerGlobal::getInstance()->getCameraIdList(&idList);
 
     int numCameras = idList.size();
@@ -652,7 +653,7 @@
         return ACAMERA_ERROR_NOT_ENOUGH_MEMORY;
     }
     for (int i = 0; i < numCameras; i++) {
-        const char* src = idList[i].string();
+        const char* src = idList[i].c_str();
         size_t dstSize = strlen(src) + 1;
         char* dst = new char[dstSize];
         if (!dst) {
@@ -694,7 +695,7 @@
 
     CameraMetadata rawMetadata;
     int targetSdkVersion = android_get_application_target_sdk_version();
-    binder::Status serviceRet = cs->getCameraCharacteristics(String16(cameraIdStr),
+    binder::Status serviceRet = cs->getCameraCharacteristics(cameraIdStr,
             targetSdkVersion, /*overrideToPortrait*/false, &rawMetadata);
     if (!serviceRet.isOk()) {
         switch(serviceRet.serviceSpecificErrorCode()) {
@@ -745,7 +746,7 @@
     // No way to get package name from native.
     // Send a zero length package name and let camera service figure it out from UID
     binder::Status serviceRet = cs->connectDevice(
-            callbacks, String16(cameraId), String16(""), {},
+            callbacks, cameraId, "", {},
             hardware::ICameraService::USE_CALLING_UID, /*oomScoreOffset*/0,
             targetSdkVersion, /*overrideToPortrait*/false, /*out*/&deviceRemote);
 
diff --git a/camera/ndk/impl/ACameraManager.h b/camera/ndk/impl/ACameraManager.h
index 0dd79da..c135d0f 100644
--- a/camera/ndk/impl/ACameraManager.h
+++ b/camera/ndk/impl/ACameraManager.h
@@ -62,7 +62,7 @@
     /**
      * Return camera IDs that support camera2
      */
-    void getCameraIdList(std::vector<String8> *cameraIds);
+    void getCameraIdList(std::vector<std::string> *cameraIds);
 
   private:
     sp<hardware::ICameraService> mCameraService;
@@ -87,23 +87,23 @@
     class CameraServiceListener final : public hardware::BnCameraServiceListener {
       public:
         explicit CameraServiceListener(CameraManagerGlobal* cm) : mCameraManager(cm) {}
-        virtual binder::Status onStatusChanged(int32_t status, const String16& cameraId);
+        virtual binder::Status onStatusChanged(int32_t status, const std::string& cameraId);
         virtual binder::Status onPhysicalCameraStatusChanged(int32_t status,
-                const String16& cameraId, const String16& physicalCameraId);
+                const std::string& cameraId, const std::string& physicalCameraId);
 
         // Torch API not implemented yet
-        virtual binder::Status onTorchStatusChanged(int32_t, const String16&) {
+        virtual binder::Status onTorchStatusChanged(int32_t, const std::string&) {
             return binder::Status::ok();
         }
-        virtual binder::Status onTorchStrengthLevelChanged(const String16&, int32_t) {
+        virtual binder::Status onTorchStrengthLevelChanged(const std::string&, int32_t) {
             return binder::Status::ok();
         }
 
         virtual binder::Status onCameraAccessPrioritiesChanged();
-        virtual binder::Status onCameraOpened(const String16&, const String16&) {
+        virtual binder::Status onCameraOpened(const std::string&, const std::string&) {
             return binder::Status::ok();
         }
-        virtual binder::Status onCameraClosed(const String16&) {
+        virtual binder::Status onCameraClosed(const std::string&) {
             return binder::Status::ok();
         }
 
@@ -203,20 +203,20 @@
 
     sp<hardware::ICameraService> getCameraServiceLocked();
     void onCameraAccessPrioritiesChanged();
-    void onStatusChanged(int32_t status, const String8& cameraId);
-    void onStatusChangedLocked(int32_t status, const String8& cameraId);
-    void onStatusChanged(int32_t status, const String8& cameraId, const String8& physicalCameraId);
-    void onStatusChangedLocked(int32_t status, const String8& cameraId,
-           const String8& physicalCameraId);
+    void onStatusChanged(int32_t status, const std::string& cameraId);
+    void onStatusChangedLocked(int32_t status, const std::string& cameraId);
+    void onStatusChanged(int32_t status, const std::string& cameraId, const std::string& physicalCameraId);
+    void onStatusChangedLocked(int32_t status, const std::string& cameraId,
+           const std::string& physicalCameraId);
     // Utils for status
     static bool validStatus(int32_t status);
     static bool isStatusAvailable(int32_t status);
-    bool supportsCamera2ApiLocked(const String8 &cameraId);
+    bool supportsCamera2ApiLocked(const std::string &cameraId);
 
     // The sort logic must match the logic in
     // libcameraservice/common/CameraProviderManager.cpp::getAPI1CompatibleCameraDeviceIds
     struct CameraIdComparator {
-        bool operator()(const String8& a, const String8& b) const {
+        bool operator()(const std::string& a, const std::string& b) const {
             uint32_t aUint = 0, bUint = 0;
             bool aIsUint = base::ParseUint(a.c_str(), &aUint);
             bool bIsUint = base::ParseUint(b.c_str(), &bUint);
@@ -238,22 +238,22 @@
       private:
         int32_t status = hardware::ICameraServiceListener::STATUS_NOT_PRESENT;
         mutable std::mutex mLock;
-        std::set<String8> unavailablePhysicalIds;
+        std::set<std::string> unavailablePhysicalIds;
       public:
         const bool supportsHAL3 = false;
         StatusAndHAL3Support(int32_t st, bool HAL3support):
                 status(st), supportsHAL3(HAL3support) { };
         StatusAndHAL3Support() = default;
 
-        bool addUnavailablePhysicalId(const String8& physicalCameraId);
-        bool removeUnavailablePhysicalId(const String8& physicalCameraId);
+        bool addUnavailablePhysicalId(const std::string& physicalCameraId);
+        bool removeUnavailablePhysicalId(const std::string& physicalCameraId);
         int32_t getStatus();
         void updateStatus(int32_t newStatus);
-        std::set<String8> getUnavailablePhysicalIds();
+        std::set<std::string> getUnavailablePhysicalIds();
     };
 
     // Map camera_id -> status
-    std::map<String8, StatusAndHAL3Support, CameraIdComparator> mDeviceStatusMap;
+    std::map<std::string, StatusAndHAL3Support, CameraIdComparator> mDeviceStatusMap;
 
     // For the singleton instance
     static Mutex sLock;
diff --git a/camera/tests/CameraBinderTests.cpp b/camera/tests/CameraBinderTests.cpp
index 1af5637..bb963ab 100644
--- a/camera/tests/CameraBinderTests.cpp
+++ b/camera/tests/CameraBinderTests.cpp
@@ -43,6 +43,7 @@
 #include <camera/camera2/OutputConfiguration.h>
 #include <camera/camera2/SessionConfiguration.h>
 #include <camera/camera2/SubmitInfo.h>
+#include <camera/StringUtils.h>
 
 #include <gui/BufferItemConsumer.h>
 #include <gui/IGraphicBufferProducer.h>
@@ -68,15 +69,15 @@
 
 // Stub listener implementation
 class TestCameraServiceListener : public hardware::BnCameraServiceListener {
-    std::map<String16, int32_t> mCameraTorchStatuses;
-    std::map<String16, int32_t> mCameraStatuses;
+    std::map<std::string, int32_t> mCameraTorchStatuses;
+    std::map<std::string, int32_t> mCameraStatuses;
     mutable Mutex mLock;
     mutable Condition mCondition;
     mutable Condition mTorchCondition;
 public:
     virtual ~TestCameraServiceListener() {};
 
-    virtual binder::Status onStatusChanged(int32_t status, const String16& cameraId) {
+    virtual binder::Status onStatusChanged(int32_t status, const std::string& cameraId) override {
         Mutex::Autolock l(mLock);
         mCameraStatuses[cameraId] = status;
         mCondition.broadcast();
@@ -84,36 +85,37 @@
     };
 
     virtual binder::Status onPhysicalCameraStatusChanged(int32_t /*status*/,
-            const String16& /*cameraId*/, const String16& /*physicalCameraId*/) {
+            const std::string& /*cameraId*/, const std::string& /*physicalCameraId*/) override {
         // No op
         return binder::Status::ok();
     };
 
-    virtual binder::Status onTorchStatusChanged(int32_t status, const String16& cameraId) {
+    virtual binder::Status onTorchStatusChanged(int32_t status,
+            const std::string& cameraId) override {
         Mutex::Autolock l(mLock);
         mCameraTorchStatuses[cameraId] = status;
         mTorchCondition.broadcast();
         return binder::Status::ok();
     };
 
-    virtual binder::Status onTorchStrengthLevelChanged(const String16& /*cameraId*/,
-            int32_t /*torchStrength*/) {
+    virtual binder::Status onTorchStrengthLevelChanged(const std::string& /*cameraId*/,
+            int32_t /*torchStrength*/) override {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraAccessPrioritiesChanged() {
+    virtual binder::Status onCameraAccessPrioritiesChanged() override {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraOpened(const String16& /*cameraId*/,
-            const String16& /*clientPackageName*/) {
+    virtual binder::Status onCameraOpened(const std::string& /*cameraId*/,
+            const std::string& /*clientPackageName*/) {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraClosed(const String16& /*cameraId*/) {
+    virtual binder::Status onCameraClosed(const std::string& /*cameraId*/) override {
         // No op
         return binder::Status::ok();
     }
@@ -136,7 +138,7 @@
     bool waitForTorchState(int32_t status, int32_t cameraId) const {
         Mutex::Autolock l(mLock);
 
-        const auto& iter = mCameraTorchStatuses.find(String16(String8::format("%d", cameraId)));
+        const auto& iter = mCameraTorchStatuses.find(std::to_string(cameraId));
         if (iter != mCameraTorchStatuses.end() && iter->second == status) {
             return true;
         }
@@ -147,7 +149,7 @@
                 return false;
             }
             const auto& iter =
-                    mCameraTorchStatuses.find(String16(String8::format("%d", cameraId)));
+                    mCameraTorchStatuses.find(std::to_string(cameraId));
             foundStatus = (iter != mCameraTorchStatuses.end() && iter->second == status);
         }
         return true;
@@ -155,14 +157,14 @@
 
     int32_t getTorchStatus(int32_t cameraId) const {
         Mutex::Autolock l(mLock);
-        const auto& iter = mCameraTorchStatuses.find(String16(String8::format("%d", cameraId)));
+        const auto& iter = mCameraTorchStatuses.find(std::to_string(cameraId));
         if (iter == mCameraTorchStatuses.end()) {
             return hardware::ICameraServiceListener::TORCH_STATUS_UNKNOWN;
         }
         return iter->second;
     };
 
-    int32_t getStatus(const String16& cameraId) const {
+    int32_t getStatus(const std::string& cameraId) const {
         Mutex::Autolock l(mLock);
         const auto& iter = mCameraStatuses.find(cameraId);
         if (iter == mCameraStatuses.end()) {
@@ -352,11 +354,11 @@
 
     EXPECT_EQ(numCameras, static_cast<const int>(statuses.size()));
     for (const auto &it : statuses) {
-        listener->onStatusChanged(it.status, String16(it.cameraId));
+        listener->onStatusChanged(it.status, it.cameraId);
     }
 
     for (int32_t i = 0; i < numCameras; i++) {
-        String16 cameraId = String16(String8::format("%d", i));
+        std::string cameraId = std::to_string(i);
         bool isSupported = false;
         res = service->supportsCameraApi(cameraId,
                 hardware::ICameraService::API_VERSION_2, &isSupported);
@@ -384,7 +386,7 @@
         // Check connect binder calls
         sp<TestCameraDeviceCallbacks> callbacks(new TestCameraDeviceCallbacks());
         sp<hardware::camera2::ICameraDeviceUser> device;
-        res = service->connectDevice(callbacks, cameraId, String16("meeeeeeeee!"),
+        res = service->connectDevice(callbacks, cameraId, "meeeeeeeee!",
                 {}, hardware::ICameraService::USE_CALLING_UID, /*oomScoreOffset*/ 0,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__,
                 /*overrideToPortrait*/false, /*out*/&device);
@@ -423,12 +425,12 @@
     sp<TestCameraServiceListener> serviceListener;
 
     std::pair<sp<TestCameraDeviceCallbacks>, sp<hardware::camera2::ICameraDeviceUser>>
-            openNewDevice(const String16& deviceId) {
+            openNewDevice(const std::string& deviceId) {
         sp<TestCameraDeviceCallbacks> callbacks(new TestCameraDeviceCallbacks());
         sp<hardware::camera2::ICameraDeviceUser> device;
         {
             SCOPED_TRACE("openNewDevice");
-            binder::Status res = service->connectDevice(callbacks, deviceId, String16("meeeeeeeee!"),
+            binder::Status res = service->connectDevice(callbacks, deviceId, "meeeeeeeee!",
                     {}, hardware::ICameraService::USE_CALLING_UID, /*oomScoreOffset*/ 0,
                     /*targetSdkVersion*/__ANDROID_API_FUTURE__,
                     /*overrideToPortrait*/false, /*out*/&device);
@@ -464,7 +466,7 @@
         std::vector<hardware::CameraStatus> statuses;
         service->addListener(serviceListener, &statuses);
         for (const auto &it : statuses) {
-            serviceListener->onStatusChanged(it.status, String16(it.cameraId));
+            serviceListener->onStatusChanged(it.status, it.cameraId);
         }
         service->getNumberOfCameras(hardware::ICameraService::CAMERA_TYPE_BACKWARD_COMPATIBLE,
                 &numCameras);
@@ -484,9 +486,8 @@
     ASSERT_NOT_NULL(service);
     EXPECT_TRUE(serviceListener->waitForNumCameras(numCameras));
     for (int32_t i = 0; i < numCameras; i++) {
-        String8 cameraId8 = String8::format("%d", i);
+        std::string cameraId = std::to_string(i);
         // Make sure we're available, or skip device tests otherwise
-        String16 cameraId(cameraId8);
         int32_t s = serviceListener->getStatus(cameraId);
         EXPECT_EQ(hardware::ICameraServiceListener::STATUS_PRESENT, s);
         if (s != hardware::ICameraServiceListener::STATUS_PRESENT) {
@@ -513,7 +514,7 @@
 
         sp<Surface> surface(new Surface(gbProducer, /*controlledByApp*/false));
 
-        String16 noPhysicalId;
+        std::string noPhysicalId;
         OutputConfiguration output(gbProducer, /*rotation*/0, noPhysicalId);
 
         // Can we configure?
@@ -550,7 +551,7 @@
         EXPECT_TRUE(res.isOk()) << res;
 
         hardware::camera2::CaptureRequest request;
-        request.mPhysicalCameraSettings.push_back({cameraId8.string(), requestTemplate});
+        request.mPhysicalCameraSettings.push_back({cameraId, requestTemplate});
         request.mSurfaceList.add(surface);
         request.mIsReprocess = false;
         int64_t lastFrameNumber = 0;
@@ -577,7 +578,7 @@
                 /*out*/&requestTemplate);
         EXPECT_TRUE(res.isOk()) << res;
         hardware::camera2::CaptureRequest request2;
-        request2.mPhysicalCameraSettings.push_back({cameraId8.string(), requestTemplate});
+        request2.mPhysicalCameraSettings.push_back({cameraId, requestTemplate});
         request2.mSurfaceList.add(surface);
         request2.mIsReprocess = false;
         callbacks->clearStatus();
@@ -610,10 +611,10 @@
         EXPECT_TRUE(res.isOk()) << res;
         android::hardware::camera2::CaptureRequest request3;
         android::hardware::camera2::CaptureRequest request4;
-        request3.mPhysicalCameraSettings.push_back({cameraId8.string(), requestTemplate});
+        request3.mPhysicalCameraSettings.push_back({cameraId, requestTemplate});
         request3.mSurfaceList.add(surface);
         request3.mIsReprocess = false;
-        request4.mPhysicalCameraSettings.push_back({cameraId8.string(), requestTemplate2});
+        request4.mPhysicalCameraSettings.push_back({cameraId, requestTemplate2});
         request4.mSurfaceList.add(surface);
         request4.mIsReprocess = false;
         std::vector<hardware::camera2::CaptureRequest> requestList;
diff --git a/camera/tests/CameraCharacteristicsPermission.cpp b/camera/tests/CameraCharacteristicsPermission.cpp
index f2fa48c..1de7cb4 100644
--- a/camera/tests/CameraCharacteristicsPermission.cpp
+++ b/camera/tests/CameraCharacteristicsPermission.cpp
@@ -62,7 +62,7 @@
 TEST_F(CameraCharacteristicsPermission, TestCameraPermission) {
     for (int32_t cameraId = 0; cameraId < numCameras; cameraId++) {
 
-        String16 cameraIdStr = String16(String8::format("%d", cameraId));
+        std::string cameraIdStr = std::to_string(cameraId);
         bool isSupported = false;
         auto rc = mCameraService->supportsCameraApi(cameraIdStr,
                 hardware::ICameraService::API_VERSION_2, &isSupported);
diff --git a/camera/tests/CameraZSLTests.cpp b/camera/tests/CameraZSLTests.cpp
index 6423709..3ae7659 100644
--- a/camera/tests/CameraZSLTests.cpp
+++ b/camera/tests/CameraZSLTests.cpp
@@ -27,6 +27,7 @@
 #include <camera/CameraParameters.h>
 #include <camera/CameraMetadata.h>
 #include <camera/Camera.h>
+#include <camera/StringUtils.h>
 #include <android/hardware/ICameraService.h>
 
 using namespace android;
@@ -169,7 +170,7 @@
         sp<SurfaceControl> surfaceControl;
         sp<ICamera> cameraDevice;
 
-        String16 cameraIdStr = String16(String8::format("%d", cameraId));
+        std::string cameraIdStr = std::to_string(cameraId);
         bool isSupported = false;
         rc = mCameraService->supportsCameraApi(cameraIdStr,
                 hardware::ICameraService::API_VERSION_1, &isSupported);
@@ -208,7 +209,7 @@
         }
 
         rc = mCameraService->connect(this, cameraId,
-                String16("ZSLTest"), hardware::ICameraService::USE_CALLING_UID,
+                "ZSLTest", hardware::ICameraService::USE_CALLING_UID,
                 hardware::ICameraService::USE_CALLING_PID,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__,
                 /*overrideToPortrait*/false, /*forceSlowJpegMode*/false, &cameraDevice);
diff --git a/camera/tests/fuzzer/camera_Parameters_fuzzer.cpp b/camera/tests/fuzzer/camera_Parameters_fuzzer.cpp
index 45b3526..07efc20 100644
--- a/camera/tests/fuzzer/camera_Parameters_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_Parameters_fuzzer.cpp
@@ -19,6 +19,7 @@
 #include <fcntl.h>
 #include <fuzzer/FuzzedDataProvider.h>
 #include <utils/String16.h>
+#include <camera/StringUtils.h>
 
 using namespace std;
 using namespace android;
@@ -77,7 +78,7 @@
         } else {
             params = mFDP->ConsumeRandomLengthString();
         }
-        *obj = new type(String8(params.c_str()));
+        *obj = new type(toString8(params));
     }
 }
 
diff --git a/camera/tests/fuzzer/camera_SessionStats_fuzzer.cpp b/camera/tests/fuzzer/camera_SessionStats_fuzzer.cpp
index 2f2ad77..c9bb20c 100644
--- a/camera/tests/fuzzer/camera_SessionStats_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_SessionStats_fuzzer.cpp
@@ -17,6 +17,7 @@
 #include <CameraSessionStats.h>
 #include <binder/Parcel.h>
 #include <fuzzer/FuzzedDataProvider.h>
+#include <camera/StringUtils.h>
 #include "camera2common.h"
 
 using namespace std;
@@ -100,10 +101,9 @@
     if (fdp.ConsumeBool()) {
         cameraSessionStats = new CameraSessionStats();
     } else {
-        string camId = fdp.ConsumeRandomLengthString();
-        String16 cameraId(camId.c_str());
+        string cameraId = fdp.ConsumeRandomLengthString();
         if (fdp.ConsumeBool()) {
-            parcelCamSessionStats.writeString16(cameraId);
+            parcelCamSessionStats.writeString16(toString16(cameraId));
         }
         int32_t facing = fdp.ConsumeIntegral<int32_t>();
         if (fdp.ConsumeBool()) {
@@ -113,10 +113,9 @@
         if (fdp.ConsumeBool()) {
             parcelCamSessionStats.writeInt32(newCameraState);
         }
-        string name = fdp.ConsumeRandomLengthString();
-        String16 clientName(name.c_str());
+        string clientName = fdp.ConsumeRandomLengthString();
         if (fdp.ConsumeBool()) {
-            parcelCamSessionStats.writeString16(clientName);
+            parcelCamSessionStats.writeString16(toString16(clientName));
         }
         int32_t apiLevel = fdp.ConsumeIntegral<int32_t>();
         if (fdp.ConsumeBool()) {
diff --git a/camera/tests/fuzzer/camera_c2CaptureRequest_fuzzer.cpp b/camera/tests/fuzzer/camera_c2CaptureRequest_fuzzer.cpp
index 06215a5..494ec1b 100644
--- a/camera/tests/fuzzer/camera_c2CaptureRequest_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_c2CaptureRequest_fuzzer.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <CameraMetadata.h>
+#include <camera/StringUtils.h>
 #include <camera2/CaptureRequest.h>
 #include <fuzzer/FuzzedDataProvider.h>
 #include <gui/Surface.h>
@@ -45,7 +46,7 @@
     for (size_t idx = 0; idx < physicalCameraSettingsSize; ++idx) {
         string id = fdp.ConsumeRandomLengthString();
         if (fdp.ConsumeBool()) {
-            parcelCamCaptureReq.writeString16(String16(id.c_str()));
+            parcelCamCaptureReq.writeString16(toString16(id));
         }
         CameraMetadata cameraMetadata;
         if (fdp.ConsumeBool()) {
diff --git a/camera/tests/fuzzer/camera_c2OutputConfiguration_fuzzer.cpp b/camera/tests/fuzzer/camera_c2OutputConfiguration_fuzzer.cpp
index 51ac4e8..2fe9a94 100644
--- a/camera/tests/fuzzer/camera_c2OutputConfiguration_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_c2OutputConfiguration_fuzzer.cpp
@@ -38,8 +38,7 @@
         outputConfiguration = new OutputConfiguration();
     } else {
         int32_t rotation = fdp.ConsumeIntegral<int32_t>();
-        string phyCameraId = fdp.ConsumeRandomLengthString();
-        String16 physicalCameraId(phyCameraId.c_str());
+        string physicalCameraId = fdp.ConsumeRandomLengthString();
         int32_t surfaceSetID = fdp.ConsumeIntegral<int32_t>();
         bool isShared = fdp.ConsumeBool();
 
diff --git a/camera/tests/fuzzer/camera_c2SessionConfiguration_fuzzer.cpp b/camera/tests/fuzzer/camera_c2SessionConfiguration_fuzzer.cpp
index b2de95d..7cd0e59 100644
--- a/camera/tests/fuzzer/camera_c2SessionConfiguration_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_c2SessionConfiguration_fuzzer.cpp
@@ -65,8 +65,7 @@
             surface.clear();
         }
         int32_t rotation = fdp.ConsumeIntegral<int32_t>();
-        string phyCameraId = fdp.ConsumeRandomLengthString();
-        String16 physicalCameraId(phyCameraId.c_str());
+        string physicalCameraId = fdp.ConsumeRandomLengthString();
         int32_t surfaceSetID = fdp.ConsumeIntegral<int32_t>();
         bool isShared = fdp.ConsumeBool();
         outputConfiguration =
diff --git a/camera/tests/fuzzer/camera_captureResult_fuzzer.cpp b/camera/tests/fuzzer/camera_captureResult_fuzzer.cpp
index 1396431..dd857d4 100644
--- a/camera/tests/fuzzer/camera_captureResult_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_captureResult_fuzzer.cpp
@@ -32,8 +32,7 @@
     if (fdp.ConsumeBool()) {
         physicalCaptureResultInfo = new PhysicalCaptureResultInfo();
     } else {
-        string camId = fdp.ConsumeRandomLengthString();
-        String16 cameraId(camId.c_str());
+        string cameraId = fdp.ConsumeRandomLengthString();
         CameraMetadata cameraMetadata = CameraMetadata();
         physicalCaptureResultInfo = new PhysicalCaptureResultInfo(cameraId, cameraMetadata);
     }
@@ -47,9 +46,7 @@
     }
     if (fdp.ConsumeBool()) {
         captureResult->mResultExtras = CaptureResultExtras();
-        string errCamId = fdp.ConsumeRandomLengthString();
-        String16 errCameraId(errCamId.c_str());
-        captureResult->mResultExtras.errorPhysicalCameraId = errCameraId;
+        captureResult->mResultExtras.errorPhysicalCameraId = fdp.ConsumeRandomLengthString();
         captureResult->mResultExtras.isValid();
         invokeReadWriteNullParcel<CaptureResultExtras>(&(captureResult->mResultExtras));
     }
diff --git a/camera/tests/fuzzer/camera_fuzzer.cpp b/camera/tests/fuzzer/camera_fuzzer.cpp
index f9ef98e..d09a6dd 100644
--- a/camera/tests/fuzzer/camera_fuzzer.cpp
+++ b/camera/tests/fuzzer/camera_fuzzer.cpp
@@ -149,7 +149,7 @@
     sp<IBinder> binder = sm->getService(String16("media.camera"));
     mCameraService = interface_cast<ICameraService>(binder);
     mCameraService->connect(this, mFDP->ConsumeIntegral<int32_t>() /* cameraId */,
-                            String16("CAMERAFUZZ"), hardware::ICameraService::USE_CALLING_UID,
+                            "CAMERAFUZZ", hardware::ICameraService::USE_CALLING_UID,
                             hardware::ICameraService::USE_CALLING_PID,
                             /*targetSdkVersion*/ __ANDROID_API_FUTURE__,
                             /*overrideToPortrait*/false, /*forceSlowJpegMode*/false, &cameraDevice);
@@ -294,18 +294,15 @@
         cameraStatus = new CameraStatus();
     } else {
         string cid = mFDP->ConsumeRandomLengthString();
-        String8 id(cid.c_str());
         int32_t status = mFDP->ConsumeIntegral<int32_t>();
         size_t unavailSubIdsSize = mFDP->ConsumeIntegralInRange<size_t>(kSizeMin, kSizeMax);
-        vector<String8> unavailSubIds;
+        vector<std::string> unavailSubIds;
         for (size_t idx = 0; idx < unavailSubIdsSize; ++idx) {
             string subId = mFDP->ConsumeRandomLengthString();
-            String8 unavailSubId(subId.c_str());
-            unavailSubIds.push_back(unavailSubId);
+            unavailSubIds.push_back(subId);
         }
-        string clientPkg = mFDP->ConsumeRandomLengthString();
-        String8 clientPackage(clientPkg.c_str());
-        cameraStatus = new CameraStatus(id, status, unavailSubIds, clientPackage);
+        string clientPackage = mFDP->ConsumeRandomLengthString();
+        cameraStatus = new CameraStatus(cid, status, unavailSubIds, clientPackage);
     }
 
     invokeReadWriteParcel<CameraStatus>(cameraStatus);
diff --git a/media/libstagefright/CameraSource.cpp b/media/libstagefright/CameraSource.cpp
index 967c316..4441121 100644
--- a/media/libstagefright/CameraSource.cpp
+++ b/media/libstagefright/CameraSource.cpp
@@ -32,6 +32,7 @@
 #include <media/stagefright/MetaData.h>
 #include <camera/Camera.h>
 #include <camera/CameraParameters.h>
+#include <camera/StringUtils.h>
 #include <gui/Surface.h>
 #include <utils/String8.h>
 #include <cutils/properties.h>
@@ -146,7 +147,7 @@
 
 status_t CameraSource::isCameraAvailable(
     const sp<hardware::ICamera>& camera, const sp<ICameraRecordingProxy>& proxy,
-    int32_t cameraId, const String16& clientName, uid_t clientUid, pid_t clientPid) {
+    int32_t cameraId, const std::string& clientName, uid_t clientUid, pid_t clientPid) {
 
     if (camera == 0) {
         mCamera = Camera::connect(cameraId, clientName, clientUid, clientPid,
@@ -535,7 +536,7 @@
     status_t err = OK;
 
     if ((err = isCameraAvailable(camera, proxy, cameraId,
-            clientName, clientUid, clientPid)) != OK) {
+            toStdString(clientName), clientUid, clientPid)) != OK) {
         ALOGE("Camera connection could not be established.");
         return err;
     }
diff --git a/media/libstagefright/include/media/stagefright/CameraSource.h b/media/libstagefright/include/media/stagefright/CameraSource.h
index e8770ed..fcd17b9 100644
--- a/media/libstagefright/include/media/stagefright/CameraSource.h
+++ b/media/libstagefright/include/media/stagefright/CameraSource.h
@@ -259,7 +259,7 @@
     status_t isCameraAvailable(const sp<hardware::ICamera>& camera,
                                const sp<ICameraRecordingProxy>& proxy,
                                int32_t cameraId,
-                               const String16& clientName,
+                               const std::string& clientName,
                                uid_t clientUid,
                                pid_t clientPid);
 
diff --git a/services/camera/libcameraservice/CameraFlashlight.cpp b/services/camera/libcameraservice/CameraFlashlight.cpp
index ffd38be..d9d8a3d 100644
--- a/services/camera/libcameraservice/CameraFlashlight.cpp
+++ b/services/camera/libcameraservice/CameraFlashlight.cpp
@@ -47,14 +47,14 @@
 CameraFlashlight::~CameraFlashlight() {
 }
 
-status_t CameraFlashlight::createFlashlightControl(const String8& cameraId) {
+status_t CameraFlashlight::createFlashlightControl(const std::string& cameraId) {
     ALOGV("%s: creating a flash light control for camera %s", __FUNCTION__,
-            cameraId.string());
+            cameraId.c_str());
     if (mFlashControl != NULL) {
         return INVALID_OPERATION;
     }
 
-    if (mProviderManager->supportSetTorchMode(cameraId.string())) {
+    if (mProviderManager->supportSetTorchMode(cameraId)) {
         mFlashControl = new ProviderFlashControl(mProviderManager);
     } else {
         ALOGE("Flashlight control not supported by this device!");
@@ -64,7 +64,7 @@
     return OK;
 }
 
-status_t CameraFlashlight::setTorchMode(const String8& cameraId, bool enabled) {
+status_t CameraFlashlight::setTorchMode(const std::string& cameraId, bool enabled) {
     if (!mFlashlightMapInitialized) {
         ALOGE("%s: findFlashUnits() must be called before this method.",
                __FUNCTION__);
@@ -72,7 +72,7 @@
     }
 
     ALOGV("%s: set torch mode of camera %s to %d", __FUNCTION__,
-            cameraId.string(), enabled);
+            cameraId.c_str(), enabled);
 
     status_t res = OK;
     Mutex::Autolock l(mLock);
@@ -87,7 +87,7 @@
         // TODO: Move torch status checks and state updates behind this CameraFlashlight lock
         // to avoid other similar race conditions.
         ALOGE("%s: Camera device %s is in use, cannot set torch mode.",
-                __FUNCTION__, cameraId.string());
+                __FUNCTION__, cameraId.c_str());
         return -EBUSY;
     }
 
@@ -117,7 +117,7 @@
     return res;
 }
 
-status_t CameraFlashlight::turnOnTorchWithStrengthLevel(const String8& cameraId,
+status_t CameraFlashlight::turnOnTorchWithStrengthLevel(const std::string& cameraId,
             int32_t torchStrength) {
     if (!mFlashlightMapInitialized) {
         ALOGE("%s: findFlashUnits() must be called before this method.",
@@ -126,13 +126,13 @@
     }
 
     ALOGV("%s: set torch strength of camera %s to %d", __FUNCTION__,
-            cameraId.string(), torchStrength);
+            cameraId.c_str(), torchStrength);
     status_t res = OK;
     Mutex::Autolock l(mLock);
 
     if (mOpenedCameraIds.indexOf(cameraId) != NAME_NOT_FOUND) {
         ALOGE("%s: Camera device %s is in use, cannot be turned ON.",
-                __FUNCTION__, cameraId.string());
+                __FUNCTION__, cameraId.c_str());
         return -EBUSY;
     }
 
@@ -148,7 +148,7 @@
 }
 
 
-status_t CameraFlashlight::getTorchStrengthLevel(const String8& cameraId,
+status_t CameraFlashlight::getTorchStrengthLevel(const std::string& cameraId,
             int32_t* torchStrength) {
     status_t res = OK;
     if (!mFlashlightMapInitialized) {
@@ -174,13 +174,13 @@
     Mutex::Autolock l(mLock);
     status_t res;
 
-    std::vector<String8> cameraIds;
+    std::vector<std::string> cameraIds;
     std::vector<std::string> ids = mProviderManager->getCameraDeviceIds();
     int numberOfCameras = static_cast<int>(ids.size());
     cameraIds.resize(numberOfCameras);
     // No module, must be provider
     for (size_t i = 0; i < cameraIds.size(); i++) {
-        cameraIds[i] = String8(ids[i].c_str());
+        cameraIds[i] = ids[i];
     }
 
     mFlashControl.clear();
@@ -195,17 +195,17 @@
         res = createFlashlightControl(id);
         if (res) {
             ALOGE("%s: failed to create flash control for %s", __FUNCTION__,
-                    id.string());
+                    id.c_str());
         } else {
             res = mFlashControl->hasFlashUnit(id, &hasFlash);
             if (res == -EUSERS || res == -EBUSY) {
                 ALOGE("%s: failed to check if camera %s has a flash unit. Some "
                         "camera devices may be opened", __FUNCTION__,
-                        id.string());
+                        id.c_str());
                 return res;
             } else if (res) {
                 ALOGE("%s: failed to check if camera %s has a flash unit. %s"
-                        " (%d)", __FUNCTION__, id.string(), strerror(-res),
+                        " (%d)", __FUNCTION__, id.c_str(), strerror(-res),
                         res);
             }
 
@@ -218,12 +218,12 @@
     return OK;
 }
 
-bool CameraFlashlight::hasFlashUnit(const String8& cameraId) {
+bool CameraFlashlight::hasFlashUnit(const std::string& cameraId) {
     Mutex::Autolock l(mLock);
     return hasFlashUnitLocked(cameraId);
 }
 
-bool CameraFlashlight::hasFlashUnitLocked(const String8& cameraId) {
+bool CameraFlashlight::hasFlashUnitLocked(const std::string& cameraId) {
     if (!mFlashlightMapInitialized) {
         ALOGE("%s: findFlashUnits() must be called before this method.",
                __FUNCTION__);
@@ -234,23 +234,23 @@
     if (index == NAME_NOT_FOUND) {
         // Might be external camera
         ALOGW("%s: camera %s not present when findFlashUnits() was called",
-                __FUNCTION__, cameraId.string());
+                __FUNCTION__, cameraId.c_str());
         return false;
     }
 
     return mHasFlashlightMap.valueAt(index);
 }
 
-bool CameraFlashlight::isBackwardCompatibleMode(const String8& cameraId) {
+bool CameraFlashlight::isBackwardCompatibleMode(const std::string& cameraId) {
     bool backwardCompatibleMode = false;
     if (mProviderManager != nullptr &&
-            !mProviderManager->supportSetTorchMode(cameraId.string())) {
+            !mProviderManager->supportSetTorchMode(cameraId)) {
         backwardCompatibleMode = true;
     }
     return backwardCompatibleMode;
 }
 
-status_t CameraFlashlight::prepareDeviceOpen(const String8& cameraId) {
+status_t CameraFlashlight::prepareDeviceOpen(const std::string& cameraId) {
     ALOGV("%s: prepare for device open", __FUNCTION__);
 
     Mutex::Autolock l(mLock);
@@ -270,10 +270,9 @@
             std::vector<std::string> ids = mProviderManager->getCameraDeviceIds();
             int numCameras = static_cast<int>(ids.size());
             for (int i = 0; i < numCameras; i++) {
-                String8 id8(ids[i].c_str());
-                if (hasFlashUnitLocked(id8)) {
+                if (hasFlashUnitLocked(ids[i])) {
                     mCallbacks->onTorchStatusChanged(
-                            id8, TorchModeStatus::NOT_AVAILABLE);
+                            ids[i], TorchModeStatus::NOT_AVAILABLE);
                 }
             }
         }
@@ -289,8 +288,8 @@
     return OK;
 }
 
-status_t CameraFlashlight::deviceClosed(const String8& cameraId) {
-    ALOGV("%s: device %s is closed", __FUNCTION__, cameraId.string());
+status_t CameraFlashlight::deviceClosed(const std::string& cameraId) {
+    ALOGV("%s: device %s is closed", __FUNCTION__, cameraId.c_str());
 
     Mutex::Autolock l(mLock);
     if (!mFlashlightMapInitialized) {
@@ -302,7 +301,7 @@
     ssize_t index = mOpenedCameraIds.indexOf(cameraId);
     if (index == NAME_NOT_FOUND) {
         ALOGE("%s: couldn't find camera %s in the opened list", __FUNCTION__,
-                cameraId.string());
+                cameraId.c_str());
     } else {
         mOpenedCameraIds.removeAt(index);
     }
@@ -316,10 +315,9 @@
         std::vector<std::string> ids = mProviderManager->getCameraDeviceIds();
         int numCameras = static_cast<int>(ids.size());
         for (int i = 0; i < numCameras; i++) {
-            String8 id8(ids[i].c_str());
-            if (hasFlashUnitLocked(id8)) {
+            if (hasFlashUnitLocked(ids[i])) {
                 mCallbacks->onTorchStatusChanged(
-                        id8, TorchModeStatus::AVAILABLE_OFF);
+                        ids[i], TorchModeStatus::AVAILABLE_OFF);
             }
         }
     }
@@ -343,35 +341,35 @@
 ProviderFlashControl::~ProviderFlashControl() {
 }
 
-status_t ProviderFlashControl::hasFlashUnit(const String8& cameraId, bool *hasFlash) {
+status_t ProviderFlashControl::hasFlashUnit(const std::string& cameraId, bool *hasFlash) {
     if (!hasFlash) {
         return BAD_VALUE;
     }
-    *hasFlash = mProviderManager->hasFlashUnit(cameraId.string());
+    *hasFlash = mProviderManager->hasFlashUnit(cameraId);
     return OK;
 }
 
-status_t ProviderFlashControl::setTorchMode(const String8& cameraId, bool enabled) {
+status_t ProviderFlashControl::setTorchMode(const std::string& cameraId, bool enabled) {
     ALOGV("%s: set camera %s torch mode to %d", __FUNCTION__,
-            cameraId.string(), enabled);
+            cameraId.c_str(), enabled);
 
-    return mProviderManager->setTorchMode(cameraId.string(), enabled);
+    return mProviderManager->setTorchMode(cameraId, enabled);
 }
 
-status_t ProviderFlashControl::turnOnTorchWithStrengthLevel(const String8& cameraId,
+status_t ProviderFlashControl::turnOnTorchWithStrengthLevel(const std::string& cameraId,
             int32_t torchStrength) {
     ALOGV("%s: change torch strength level of camera %s to %d", __FUNCTION__,
-            cameraId.string(), torchStrength);
+            cameraId.c_str(), torchStrength);
 
-    return mProviderManager->turnOnTorchWithStrengthLevel(cameraId.string(), torchStrength);
+    return mProviderManager->turnOnTorchWithStrengthLevel(cameraId, torchStrength);
 }
 
-status_t ProviderFlashControl::getTorchStrengthLevel(const String8& cameraId,
+status_t ProviderFlashControl::getTorchStrengthLevel(const std::string& cameraId,
             int32_t* torchStrength) {
     ALOGV("%s: get torch strength level of camera %s", __FUNCTION__,
-            cameraId.string());
+            cameraId.c_str());
 
-    return mProviderManager->getTorchStrengthLevel(cameraId.string(), torchStrength);
+    return mProviderManager->getTorchStrengthLevel(cameraId, torchStrength);
 }
 // ProviderFlashControl implementation ends
 
diff --git a/services/camera/libcameraservice/CameraFlashlight.h b/services/camera/libcameraservice/CameraFlashlight.h
index 1703ddc..733c928 100644
--- a/services/camera/libcameraservice/CameraFlashlight.h
+++ b/services/camera/libcameraservice/CameraFlashlight.h
@@ -17,6 +17,7 @@
 #ifndef ANDROID_SERVERS_CAMERA_CAMERAFLASHLIGHT_H
 #define ANDROID_SERVERS_CAMERA_CAMERAFLASHLIGHT_H
 
+#include <string>
 #include <gui/GLConsumer.h>
 #include <gui/Surface.h>
 #include <utils/KeyedVector.h>
@@ -38,20 +39,21 @@
         // cause the torch mode to be turned off in HAL v1 devices. If
         // previously-on torch mode is turned off,
         // callbacks.torch_mode_status_change() should be invoked.
-        virtual status_t hasFlashUnit(const String8& cameraId,
+        virtual status_t hasFlashUnit(const std::string& cameraId,
                     bool *hasFlash) = 0;
 
         // set the torch mode to on or off.
-        virtual status_t setTorchMode(const String8& cameraId,
+        virtual status_t setTorchMode(const std::string& cameraId,
                     bool enabled) = 0;
 
         // Change the brightness level of the torch. If the torch is OFF and
         // torchStrength >= 1, then the torch will also be turned ON.
-        virtual status_t turnOnTorchWithStrengthLevel(const String8& cameraId,
+        virtual status_t turnOnTorchWithStrengthLevel(const std::string& cameraId,
                     int32_t torchStrength) = 0;
 
         // Returns the torch strength level.
-        virtual status_t getTorchStrengthLevel(const String8& cameraId, int32_t* torchStrength) = 0;
+        virtual status_t getTorchStrengthLevel(const std::string& cameraId,
+                int32_t* torchStrength) = 0;
 };
 
 /**
@@ -70,49 +72,49 @@
 
         // Whether a camera device has a flash unit. Before findFlashUnits() is
         // called, this function always returns false.
-        bool hasFlashUnit(const String8& cameraId);
+        bool hasFlashUnit(const std::string& cameraId);
 
         // set the torch mode to on or off.
-        status_t setTorchMode(const String8& cameraId, bool enabled);
+        status_t setTorchMode(const std::string& cameraId, bool enabled);
 
         // Change the torch strength level of the flash unit in torch mode.
-        status_t turnOnTorchWithStrengthLevel(const String8& cameraId, int32_t torchStrength);
+        status_t turnOnTorchWithStrengthLevel(const std::string& cameraId, int32_t torchStrength);
 
         // Get the torch strength level
-        status_t getTorchStrengthLevel(const String8& cameraId, int32_t* torchStrength);
+        status_t getTorchStrengthLevel(const std::string& cameraId, int32_t* torchStrength);
 
         // Notify CameraFlashlight that camera service is going to open a camera
         // device. CameraFlashlight will free the resources that may cause the
         // camera open to fail. Camera service must call this function before
         // opening a camera device.
-        status_t prepareDeviceOpen(const String8& cameraId);
+        status_t prepareDeviceOpen(const std::string& cameraId);
 
         // Notify CameraFlashlight that camera service has closed a camera
         // device. CameraFlashlight may invoke callbacks for torch mode
         // available depending on the implementation.
-        status_t deviceClosed(const String8& cameraId);
+        status_t deviceClosed(const std::string& cameraId);
 
     private:
         // create flashlight control based on camera module API and camera
         // device API versions.
-        status_t createFlashlightControl(const String8& cameraId);
+        status_t createFlashlightControl(const std::string& cameraId);
 
         // mLock should be locked.
-        bool hasFlashUnitLocked(const String8& cameraId);
+        bool hasFlashUnitLocked(const std::string& cameraId);
 
         // Check if flash control is in backward compatible mode (simulated torch API by
         // opening cameras)
-        bool isBackwardCompatibleMode(const String8& cameraId);
+        bool isBackwardCompatibleMode(const std::string& cameraId);
 
         sp<FlashControlBase> mFlashControl;
 
         sp<CameraProviderManager> mProviderManager;
 
         CameraProviderManager::StatusListener* mCallbacks;
-        SortedVector<String8> mOpenedCameraIds;
+        SortedVector<std::string> mOpenedCameraIds;
 
         // camera id -> if it has a flash unit
-        KeyedVector<String8, bool> mHasFlashlightMap;
+        KeyedVector<std::string, bool> mHasFlashlightMap;
         bool mFlashlightMapInitialized;
 
         Mutex mLock; // protect CameraFlashlight API
@@ -127,10 +129,10 @@
         virtual ~ProviderFlashControl();
 
         // FlashControlBase
-        status_t hasFlashUnit(const String8& cameraId, bool *hasFlash);
-        status_t setTorchMode(const String8& cameraId, bool enabled);
-        status_t turnOnTorchWithStrengthLevel(const String8& cameraId, int32_t torchStrength);
-        status_t getTorchStrengthLevel(const String8& cameraId, int32_t* torchStrength);
+        status_t hasFlashUnit(const std::string& cameraId, bool *hasFlash);
+        status_t setTorchMode(const std::string& cameraId, bool enabled);
+        status_t turnOnTorchWithStrengthLevel(const std::string& cameraId, int32_t torchStrength);
+        status_t getTorchStrengthLevel(const std::string& cameraId, int32_t* torchStrength);
 
     private:
         sp<CameraProviderManager> mProviderManager;
diff --git a/services/camera/libcameraservice/CameraService.cpp b/services/camera/libcameraservice/CameraService.cpp
index bf85029..c50464c 100644
--- a/services/camera/libcameraservice/CameraService.cpp
+++ b/services/camera/libcameraservice/CameraService.cpp
@@ -24,6 +24,8 @@
 #include <cstdlib>
 #include <cstring>
 #include <ctime>
+#include <iostream>
+#include <sstream>
 #include <string>
 #include <sys/types.h>
 #include <inttypes.h>
@@ -36,7 +38,6 @@
 #include <aidl/AidlCameraService.h>
 #include <android-base/macros.h>
 #include <android-base/parseint.h>
-#include <android-base/stringprintf.h>
 #include <android/permission/PermissionChecker.h>
 #include <binder/ActivityManager.h>
 #include <binder/AppOpsManager.h>
@@ -71,6 +72,7 @@
 #include <system/camera_metadata.h>
 #include <binder/IServiceManager.h>
 #include <binder/IActivityManager.h>
+#include <camera/StringUtils.h>
 
 #include <system/camera.h>
 
@@ -91,7 +93,6 @@
 
 namespace android {
 
-using base::StringPrintf;
 using binder::Status;
 using namespace camera3;
 using frameworks::cameraservice::service::V2_0::implementation::HidlCameraService;
@@ -116,28 +117,17 @@
     android_atomic_write(level, &gLogLevel);
 }
 
-// Convenience methods for constructing binder::Status objects for error returns
-
-#define STATUS_ERROR(errorCode, errorString) \
-    binder::Status::fromServiceSpecificError(errorCode, \
-            String8::format("%s:%d: %s", __FUNCTION__, __LINE__, errorString))
-
-#define STATUS_ERROR_FMT(errorCode, errorString, ...) \
-    binder::Status::fromServiceSpecificError(errorCode, \
-            String8::format("%s:%d: " errorString, __FUNCTION__, __LINE__, \
-                    __VA_ARGS__))
-
 // ----------------------------------------------------------------------------
 
-static const String16 sDumpPermission("android.permission.DUMP");
-static const String16 sManageCameraPermission("android.permission.MANAGE_CAMERA");
-static const String16 sCameraPermission("android.permission.CAMERA");
-static const String16 sSystemCameraPermission("android.permission.SYSTEM_CAMERA");
-static const String16
+static const std::string sDumpPermission("android.permission.DUMP");
+static const std::string sManageCameraPermission("android.permission.MANAGE_CAMERA");
+static const std::string sCameraPermission("android.permission.CAMERA");
+static const std::string sSystemCameraPermission("android.permission.SYSTEM_CAMERA");
+static const std::string
         sCameraSendSystemEventsPermission("android.permission.CAMERA_SEND_SYSTEM_EVENTS");
-static const String16 sCameraOpenCloseListenerPermission(
+static const std::string sCameraOpenCloseListenerPermission(
         "android.permission.CAMERA_OPEN_CLOSE_LISTENER");
-static const String16
+static const std::string
         sCameraInjectExternalCameraPermission("android.permission.CAMERA_INJECT_EXTERNAL_CAMERA");
 // Constant integer for FGS Logging, used to denote the API type for logger
 static const int LOG_FGS_CAMERA_API = 1;
@@ -145,12 +135,13 @@
 static constexpr int32_t kSystemNativeClientScore = resource_policy::PERCEPTIBLE_APP_ADJ;
 static constexpr int32_t kSystemNativeClientState =
         ActivityManager::PROCESS_STATE_PERSISTENT_UI;
+static const std::string kServiceName("cameraserver");
 
-const String8 CameraService::kOfflineDevice("offline-");
-const String16 CameraService::kWatchAllClientsFlag("all");
+const std::string CameraService::kOfflineDevice("offline-");
+const std::string CameraService::kWatchAllClientsFlag("all");
 
 // Set to keep track of logged service error events.
-static std::set<String8> sServiceErrorEventSet;
+static std::set<std::string> sServiceErrorEventSet;
 
 CameraService::CameraService(
         std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper) :
@@ -181,7 +172,7 @@
 }
 
 void CameraService::onServiceRegistration(const String16& name, const sp<IBinder>&) {
-    if (name != String16(kAppopsServiceName)) {
+    if (name != toString16(kAppopsServiceName)) {
         return;
     }
 
@@ -219,9 +210,9 @@
     // boot availability for cameraservice, use checkService which is
     // non blocking and register for notifications
     sp<IServiceManager> sm = defaultServiceManager();
-    sp<IBinder> binder = sm->checkService(String16(kAppopsServiceName));
+    sp<IBinder> binder = sm->checkService(toString16(kAppopsServiceName));
     if (!binder) {
-        sm->registerForNotifications(String16(kAppopsServiceName), this);
+        sm->registerForNotifications(toString16(kAppopsServiceName), this);
     } else {
         mAppOps.setCameraAudioRestriction(mAudioRestriction);
     }
@@ -257,8 +248,8 @@
             if (res != OK) {
                 ALOGE("%s: Unable to initialize camera provider manager: %s (%d)",
                         __FUNCTION__, strerror(-res), res);
-                logServiceError(String8::format("Unable to initialize camera provider manager"),
-                ERROR_DISCONNECTED);
+                logServiceError("Unable to initialize camera provider manager",
+                        ERROR_DISCONNECTED);
                 return res;
             }
         }
@@ -283,14 +274,12 @@
 
 
     for (auto& cameraId : deviceIds) {
-        String8 id8 = String8(cameraId.c_str());
-        if (getCameraState(id8) == nullptr) {
-            onDeviceStatusChanged(id8, CameraDeviceStatus::PRESENT);
+        if (getCameraState(cameraId) == nullptr) {
+            onDeviceStatusChanged(cameraId, CameraDeviceStatus::PRESENT);
         }
         if (unavailPhysicalIds.count(cameraId) > 0) {
             for (const auto& physicalId : unavailPhysicalIds[cameraId]) {
-                String8 physicalId8 = String8(physicalId.c_str());
-                onDeviceStatusChanged(id8, physicalId8, CameraDeviceStatus::NOT_PRESENT);
+                onDeviceStatusChanged(cameraId, physicalId, CameraDeviceStatus::NOT_PRESENT);
             }
         }
     }
@@ -310,7 +299,7 @@
     return OK;
 }
 
-void CameraService::broadcastTorchModeStatus(const String8& cameraId, TorchModeStatus status,
+void CameraService::broadcastTorchModeStatus(const std::string& cameraId, TorchModeStatus status,
         SystemCameraKind systemCameraKind) {
     Mutex::Autolock lock(mStatusListenerLock);
     for (auto& i : mListenerList) {
@@ -321,7 +310,7 @@
             continue;
         }
         auto ret = i->getListener()->onTorchStatusChanged(mapToInterface(status),
-                String16{cameraId});
+                cameraId);
         i->handleBinderStatus(ret, "%s: Failed to trigger onTorchStatusChanged for %d:%d: %d",
                 __FUNCTION__, i->getListenerUid(), i->getListenerPid(), ret.exceptionCode());
     }
@@ -343,7 +332,7 @@
     mNormalDeviceIdsWithoutSystemCamera.clear();
     for (auto &deviceId : normalDeviceIds) {
         SystemCameraKind deviceKind = SystemCameraKind::PUBLIC;
-        if (getSystemCameraKind(String8(deviceId.c_str()), &deviceKind) != OK) {
+        if (getSystemCameraKind(deviceId, &deviceKind) != OK) {
             ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, deviceId.c_str());
             continue;
         }
@@ -358,14 +347,15 @@
               mNormalDeviceIdsWithoutSystemCamera.size());
 }
 
-status_t CameraService::getSystemCameraKind(const String8& cameraId, SystemCameraKind *kind) const {
+status_t CameraService::getSystemCameraKind(const std::string& cameraId,
+        SystemCameraKind *kind) const {
     auto state = getCameraState(cameraId);
     if (state != nullptr) {
         *kind = state->getSystemCameraKind();
         return OK;
     }
     // Hidden physical camera ids won't have CameraState
-    return mCameraProviderManager->getSystemCameraKind(cameraId.c_str(), kind);
+    return mCameraProviderManager->getSystemCameraKind(cameraId, kind);
 }
 
 void CameraService::updateCameraNumAndIds() {
@@ -388,9 +378,8 @@
     for (const auto& cameraId : mNormalDeviceIdsWithoutSystemCamera) {
         int facing = -1;
         int orientation = 0;
-        String8 cameraId8(cameraId.c_str());
         int portraitRotation;
-        getDeviceVersion(cameraId8, /*overrideToPortrait*/false, /*out*/&portraitRotation,
+        getDeviceVersion(cameraId, /*overrideToPortrait*/false, /*out*/&portraitRotation,
                 /*out*/&facing, /*out*/&orientation);
         if (facing == -1) {
             ALOGE("%s: Unable to get camera device \"%s\" facing", __FUNCTION__, cameraId.c_str());
@@ -422,8 +411,7 @@
     }
 }
 
-void CameraService::addStates(const String8 id) {
-    std::string cameraId(id.c_str());
+void CameraService::addStates(const std::string& cameraId) {
     CameraResourceCost cost;
     status_t res = mCameraProviderManager->getResourceCost(cameraId, &cost);
     if (res != OK) {
@@ -438,61 +426,61 @@
     }
     std::vector<std::string> physicalCameraIds;
     mCameraProviderManager->isLogicalCamera(cameraId, &physicalCameraIds);
-    std::set<String8> conflicting;
+    std::set<std::string> conflicting;
     for (size_t i = 0; i < cost.conflictingDevices.size(); i++) {
-        conflicting.emplace(String8(cost.conflictingDevices[i].c_str()));
+        conflicting.emplace(cost.conflictingDevices[i]);
     }
 
     {
         Mutex::Autolock lock(mCameraStatesLock);
-        mCameraStates.emplace(id, std::make_shared<CameraState>(id, cost.resourceCost,
+        mCameraStates.emplace(cameraId, std::make_shared<CameraState>(cameraId, cost.resourceCost,
                 conflicting, deviceKind, physicalCameraIds));
     }
 
-    if (mFlashlight->hasFlashUnit(id)) {
+    if (mFlashlight->hasFlashUnit(cameraId)) {
         Mutex::Autolock al(mTorchStatusMutex);
-        mTorchStatusMap.add(id, TorchModeStatus::AVAILABLE_OFF);
+        mTorchStatusMap.add(cameraId, TorchModeStatus::AVAILABLE_OFF);
 
-        broadcastTorchModeStatus(id, TorchModeStatus::AVAILABLE_OFF, deviceKind);
+        broadcastTorchModeStatus(cameraId, TorchModeStatus::AVAILABLE_OFF, deviceKind);
     }
 
     updateCameraNumAndIds();
-    logDeviceAdded(id, "Device added");
+    logDeviceAdded(cameraId, "Device added");
 }
 
-void CameraService::removeStates(const String8 id) {
+void CameraService::removeStates(const std::string& cameraId) {
     updateCameraNumAndIds();
-    if (mFlashlight->hasFlashUnit(id)) {
+    if (mFlashlight->hasFlashUnit(cameraId)) {
         Mutex::Autolock al(mTorchStatusMutex);
-        mTorchStatusMap.removeItem(id);
+        mTorchStatusMap.removeItem(cameraId);
     }
 
     {
         Mutex::Autolock lock(mCameraStatesLock);
-        mCameraStates.erase(id);
+        mCameraStates.erase(cameraId);
     }
 }
 
-void CameraService::onDeviceStatusChanged(const String8& id,
+void CameraService::onDeviceStatusChanged(const std::string& cameraId,
         CameraDeviceStatus newHalStatus) {
     ALOGI("%s: Status changed for cameraId=%s, newStatus=%d", __FUNCTION__,
-            id.string(), newHalStatus);
+            cameraId.c_str(), newHalStatus);
 
     StatusInternal newStatus = mapToInternal(newHalStatus);
 
-    std::shared_ptr<CameraState> state = getCameraState(id);
+    std::shared_ptr<CameraState> state = getCameraState(cameraId);
 
     if (state == nullptr) {
         if (newStatus == StatusInternal::PRESENT) {
             ALOGI("%s: Unknown camera ID %s, a new camera is added",
-                    __FUNCTION__, id.string());
+                    __FUNCTION__, cameraId.c_str());
 
             // First add as absent to make sure clients are notified below
-            addStates(id);
+            addStates(cameraId);
 
-            updateStatus(newStatus, id);
+            updateStatus(newStatus, cameraId);
         } else {
-            ALOGE("%s: Bad camera ID %s", __FUNCTION__, id.string());
+            ALOGE("%s: Bad camera ID %s", __FUNCTION__, cameraId.c_str());
         }
         return;
     }
@@ -505,12 +493,12 @@
     }
 
     if (newStatus == StatusInternal::NOT_PRESENT) {
-        logDeviceRemoved(id, String8::format("Device status changed from %d to %d", oldStatus,
+        logDeviceRemoved(cameraId, fmt::sprintf("Device status changed from %d to %d", oldStatus,
                 newStatus));
 
         // Set the device status to NOT_PRESENT, clients will no longer be able to connect
         // to this device until the status changes
-        updateStatus(StatusInternal::NOT_PRESENT, id);
+        updateStatus(StatusInternal::NOT_PRESENT, cameraId);
 
         sp<BasicClient> clientToDisconnectOnline, clientToDisconnectOffline;
         {
@@ -522,28 +510,28 @@
 
             // Remove online as well as offline client from the list of active clients,
             // if they are present
-            clientToDisconnectOnline = removeClientLocked(id);
-            clientToDisconnectOffline = removeClientLocked(kOfflineDevice + id);
+            clientToDisconnectOnline = removeClientLocked(cameraId);
+            clientToDisconnectOffline = removeClientLocked(kOfflineDevice + cameraId);
         }
 
-        disconnectClient(id, clientToDisconnectOnline);
-        disconnectClient(kOfflineDevice + id, clientToDisconnectOffline);
+        disconnectClient(cameraId, clientToDisconnectOnline);
+        disconnectClient(kOfflineDevice + cameraId, clientToDisconnectOffline);
 
-        removeStates(id);
+        removeStates(cameraId);
     } else {
         if (oldStatus == StatusInternal::NOT_PRESENT) {
-            logDeviceAdded(id, String8::format("Device status changed from %d to %d", oldStatus,
+            logDeviceAdded(cameraId, fmt::sprintf("Device status changed from %d to %d", oldStatus,
                     newStatus));
         }
-        updateStatus(newStatus, id);
+        updateStatus(newStatus, cameraId);
     }
 }
 
-void CameraService::onDeviceStatusChanged(const String8& id,
-        const String8& physicalId,
+void CameraService::onDeviceStatusChanged(const std::string& id,
+        const std::string& physicalId,
         CameraDeviceStatus newHalStatus) {
     ALOGI("%s: Status changed for cameraId=%s, physicalCameraId=%s, newStatus=%d",
-            __FUNCTION__, id.string(), physicalId.string(), newHalStatus);
+            __FUNCTION__, id.c_str(), physicalId.c_str(), newHalStatus);
 
     StatusInternal newStatus = mapToInternal(newHalStatus);
 
@@ -551,7 +539,7 @@
 
     if (state == nullptr) {
         ALOGE("%s: Physical camera id %s status change on a non-present ID %s",
-                __FUNCTION__, physicalId.string(), id.string());
+                __FUNCTION__, physicalId.c_str(), id.c_str());
         return;
     }
 
@@ -559,7 +547,7 @@
     if (logicalCameraStatus != StatusInternal::PRESENT &&
             logicalCameraStatus != StatusInternal::NOT_AVAILABLE) {
         ALOGE("%s: Physical camera id %s status %d change for an invalid logical camera state %d",
-                __FUNCTION__, physicalId.string(), newHalStatus, logicalCameraStatus);
+                __FUNCTION__, physicalId.c_str(), newHalStatus, logicalCameraStatus);
         return;
     }
 
@@ -571,21 +559,18 @@
     }
 
     if (updated) {
-        String8 idCombo = id + " : " + physicalId;
+        std::string idCombo = id + " : " + physicalId;
         if (newStatus == StatusInternal::PRESENT) {
-            logDeviceAdded(idCombo,
-                    String8::format("Device status changed to %d", newStatus));
+            logDeviceAdded(idCombo, fmt::sprintf("Device status changed to %d", newStatus));
         } else {
-            logDeviceRemoved(idCombo,
-                    String8::format("Device status changed to %d", newStatus));
+            logDeviceRemoved(idCombo, fmt::sprintf("Device status changed to %d", newStatus));
         }
         // Avoid calling getSystemCameraKind() with mStatusListenerLock held (b/141756275)
         SystemCameraKind deviceKind = SystemCameraKind::PUBLIC;
         if (getSystemCameraKind(id, &deviceKind) != OK) {
-            ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, id.string());
+            ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, id.c_str());
             return;
         }
-        String16 id16(id), physicalId16(physicalId);
         Mutex::Autolock lock(mStatusListenerLock);
         for (auto& listener : mListenerList) {
             if (shouldSkipStatusUpdates(deviceKind, listener->isVendorListener(),
@@ -595,7 +580,7 @@
                 continue;
             }
             auto ret = listener->getListener()->onPhysicalCameraStatusChanged(
-                    mapToInterface(newStatus), id16, physicalId16);
+                    mapToInterface(newStatus), id, physicalId);
             listener->handleBinderStatus(ret,
                     "%s: Failed to trigger onPhysicalCameraStatusChanged for %d:%d: %d",
                     __FUNCTION__, listener->getListenerUid(), listener->getListenerPid(),
@@ -604,10 +589,10 @@
     }
 }
 
-void CameraService::disconnectClient(const String8& id, sp<BasicClient> clientToDisconnect) {
+void CameraService::disconnectClient(const std::string& id, sp<BasicClient> clientToDisconnect) {
     if (clientToDisconnect.get() != nullptr) {
         ALOGI("%s: Client for camera ID %s evicted due to device status change from HAL",
-                __FUNCTION__, id.string());
+                __FUNCTION__, id.c_str());
         // Notify the client of disconnection
         clientToDisconnect->notifyError(
                 hardware::camera2::ICameraDeviceCallbacks::ERROR_CAMERA_DISCONNECTED,
@@ -616,13 +601,13 @@
     }
 }
 
-void CameraService::onTorchStatusChanged(const String8& cameraId,
+void CameraService::onTorchStatusChanged(const std::string& cameraId,
         TorchModeStatus newStatus) {
     SystemCameraKind systemCameraKind = SystemCameraKind::PUBLIC;
     status_t res = getSystemCameraKind(cameraId, &systemCameraKind);
     if (res != OK) {
         ALOGE("%s: Could not get system camera kind for camera id %s", __FUNCTION__,
-                cameraId.string());
+                cameraId.c_str());
         return;
     }
     Mutex::Autolock al(mTorchStatusMutex);
@@ -630,34 +615,33 @@
 }
 
 
-void CameraService::onTorchStatusChanged(const String8& cameraId,
+void CameraService::onTorchStatusChanged(const std::string& cameraId,
         TorchModeStatus newStatus, SystemCameraKind systemCameraKind) {
     Mutex::Autolock al(mTorchStatusMutex);
     onTorchStatusChangedLocked(cameraId, newStatus, systemCameraKind);
 }
 
-void CameraService::broadcastTorchStrengthLevel(const String8& cameraId,
+void CameraService::broadcastTorchStrengthLevel(const std::string& cameraId,
         int32_t newStrengthLevel) {
     Mutex::Autolock lock(mStatusListenerLock);
     for (auto& i : mListenerList) {
-        auto ret = i->getListener()->onTorchStrengthLevelChanged(String16{cameraId},
-                newStrengthLevel);
+        auto ret = i->getListener()->onTorchStrengthLevelChanged(cameraId, newStrengthLevel);
         i->handleBinderStatus(ret,
                 "%s: Failed to trigger onTorchStrengthLevelChanged for %d:%d: %d", __FUNCTION__,
                 i->getListenerUid(), i->getListenerPid(), ret.exceptionCode());
     }
 }
 
-void CameraService::onTorchStatusChangedLocked(const String8& cameraId,
+void CameraService::onTorchStatusChangedLocked(const std::string& cameraId,
         TorchModeStatus newStatus, SystemCameraKind systemCameraKind) {
     ALOGI("%s: Torch status changed for cameraId=%s, newStatus=%d",
-            __FUNCTION__, cameraId.string(), newStatus);
+            __FUNCTION__, cameraId.c_str(), newStatus);
 
     TorchModeStatus status;
     status_t res = getTorchStatusLocked(cameraId, &status);
     if (res) {
         ALOGE("%s: cannot get torch status of camera %s: %s (%d)",
-                __FUNCTION__, cameraId.string(), strerror(-res), res);
+                __FUNCTION__, cameraId.c_str(), strerror(-res), res);
         return;
     }
     if (status == newStatus) {
@@ -682,18 +666,18 @@
             if (oldUid != newUid) {
                 // If the UID has changed, log the status and update current UID in mTorchUidMap
                 if (status == TorchModeStatus::AVAILABLE_ON) {
-                    notifier.noteFlashlightOff(cameraId, oldUid);
+                    notifier.noteFlashlightOff(toString8(cameraId), oldUid);
                 }
                 if (newStatus == TorchModeStatus::AVAILABLE_ON) {
-                    notifier.noteFlashlightOn(cameraId, newUid);
+                    notifier.noteFlashlightOn(toString8(cameraId), newUid);
                 }
                 iter->second.second = newUid;
             } else {
                 // If the UID has not changed, log the status
                 if (newStatus == TorchModeStatus::AVAILABLE_ON) {
-                    notifier.noteFlashlightOn(cameraId, oldUid);
+                    notifier.noteFlashlightOn(toString8(cameraId), oldUid);
                 } else {
-                    notifier.noteFlashlightOff(cameraId, oldUid);
+                    notifier.noteFlashlightOff(toString8(cameraId), oldUid);
                 }
             }
         }
@@ -707,11 +691,11 @@
     attributionSource.pid = callingPid;
     attributionSource.uid = callingUid;
     bool checkPermissionForSystemCamera = permissionChecker.checkPermissionForPreflight(
-            sSystemCameraPermission, attributionSource, String16(), AppOpsManager::OP_NONE)
-            != permission::PermissionChecker::PERMISSION_HARD_DENIED;
+            toString16(sSystemCameraPermission), attributionSource, String16(),
+            AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
     bool checkPermissionForCamera = permissionChecker.checkPermissionForPreflight(
-            sCameraPermission, attributionSource, String16(), AppOpsManager::OP_NONE)
-            != permission::PermissionChecker::PERMISSION_HARD_DENIED;
+            toString16(sCameraPermission), attributionSource, String16(),
+            AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
     return checkPermissionForSystemCamera && checkPermissionForCamera;
 }
 
@@ -750,13 +734,13 @@
     ATRACE_CALL();
     Mutex::Autolock l(mServiceLock);
     std::string cameraIdStr = cameraIdIntToStrLocked(cameraId);
-    if (shouldRejectSystemCameraConnection(String8(cameraIdStr.c_str()))) {
+    if (shouldRejectSystemCameraConnection(cameraIdStr)) {
         return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Unable to retrieve camera"
                 "characteristics for system only device %s: ", cameraIdStr.c_str());
     }
 
     if (!mInitialized) {
-        logServiceError(String8::format("Camera subsystem is not available"),ERROR_DISCONNECTED);
+        logServiceError("Camera subsystem is not available", ERROR_DISCONNECTED);
         return STATUS_ERROR(ERROR_DISCONNECTED,
                 "Camera subsystem is not available");
     }
@@ -775,13 +759,13 @@
     Status ret = Status::ok();
     int portraitRotation;
     status_t err = mCameraProviderManager->getCameraInfo(
-            cameraIdStr.c_str(), overrideToPortrait, &portraitRotation, cameraInfo);
+            cameraIdStr, overrideToPortrait, &portraitRotation, cameraInfo);
     if (err != OK) {
         ret = STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
                 "Error retrieving camera info from device %d: %s (%d)", cameraId,
                 strerror(-err), err);
-        logServiceError(String8::format("Error retrieving camera info from device %d",cameraId),
-            ERROR_INVALID_OPERATION);
+        logServiceError(std::string("Error retrieving camera info from device ")
+                + std::to_string(cameraId), ERROR_INVALID_OPERATION);
     }
 
     return ret;
@@ -796,8 +780,8 @@
     attributionSource.pid = callingPid;
     attributionSource.uid = callingUid;
     bool checkPermissionForSystemCamera = permissionChecker.checkPermissionForPreflight(
-                sSystemCameraPermission, attributionSource, String16(), AppOpsManager::OP_NONE)
-                != permission::PermissionChecker::PERMISSION_HARD_DENIED;
+                toString16(sSystemCameraPermission), attributionSource, String16(),
+                AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
     if (checkPermissionForSystemCamera || getpid() == callingPid) {
         deviceIds = &mNormalDeviceIds;
     }
@@ -810,12 +794,12 @@
     return (*deviceIds)[cameraIdInt];
 }
 
-String8 CameraService::cameraIdIntToStr(int cameraIdInt) {
+std::string CameraService::cameraIdIntToStr(int cameraIdInt) {
     Mutex::Autolock lock(mServiceLock);
-    return String8(cameraIdIntToStrLocked(cameraIdInt).c_str());
+    return cameraIdIntToStrLocked(cameraIdInt);
 }
 
-Status CameraService::getCameraCharacteristics(const String16& cameraId,
+Status CameraService::getCameraCharacteristics(const std::string& cameraId,
         int targetSdkVersion, bool overrideToPortrait, CameraMetadata* cameraInfo) {
     ATRACE_CALL();
     if (!cameraInfo) {
@@ -825,43 +809,41 @@
 
     if (!mInitialized) {
         ALOGE("%s: Camera HAL couldn't be initialized", __FUNCTION__);
-        logServiceError(String8::format("Camera subsystem is not available"),ERROR_DISCONNECTED);
+        logServiceError("Camera subsystem is not available", ERROR_DISCONNECTED);
         return STATUS_ERROR(ERROR_DISCONNECTED,
                 "Camera subsystem is not available");;
     }
 
-    if (shouldRejectSystemCameraConnection(String8(cameraId))) {
+    if (shouldRejectSystemCameraConnection(cameraId)) {
         return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Unable to retrieve camera"
-                "characteristics for system only device %s: ", String8(cameraId).string());
+                "characteristics for system only device %s: ", cameraId.c_str());
     }
 
     Status ret{};
 
-
-    std::string cameraIdStr = String8(cameraId).string();
     bool overrideForPerfClass =
             SessionConfigurationUtils::targetPerfClassPrimaryCamera(mPerfClassPrimaryCameraIds,
-                    cameraIdStr, targetSdkVersion);
+                    cameraId, targetSdkVersion);
     status_t res = mCameraProviderManager->getCameraCharacteristics(
-            cameraIdStr, overrideForPerfClass, cameraInfo, overrideToPortrait);
+            cameraId, overrideForPerfClass, cameraInfo, overrideToPortrait);
     if (res != OK) {
         if (res == NAME_NOT_FOUND) {
             return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT, "Unable to retrieve camera "
-                    "characteristics for unknown device %s: %s (%d)", String8(cameraId).string(),
+                    "characteristics for unknown device %s: %s (%d)", cameraId.c_str(),
                     strerror(-res), res);
         } else {
-            logServiceError(String8::format("Unable to retrieve camera characteristics for "
-            "device %s.", String8(cameraId).string()),ERROR_INVALID_OPERATION);
+            logServiceError(fmt::sprintf("Unable to retrieve camera characteristics for device %s.",
+                    cameraId.c_str()), ERROR_INVALID_OPERATION);
             return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Unable to retrieve camera "
-                    "characteristics for device %s: %s (%d)", String8(cameraId).string(),
+                    "characteristics for device %s: %s (%d)", cameraId.c_str(),
                     strerror(-res), res);
         }
     }
     SystemCameraKind deviceKind = SystemCameraKind::PUBLIC;
-    if (getSystemCameraKind(String8(cameraId), &deviceKind) != OK) {
-        ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, String8(cameraId).string());
+    if (getSystemCameraKind(cameraId, &deviceKind) != OK) {
+        ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, cameraId.c_str());
         return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Unable to retrieve camera kind "
-                "for device %s", String8(cameraId).string());
+                "for device %s", cameraId.c_str());
     }
     int callingPid = CameraThreadState::getCallingPid();
     int callingUid = CameraThreadState::getCallingUid();
@@ -874,19 +856,19 @@
     attributionSource.pid = callingPid;
     attributionSource.uid = callingUid;
     bool checkPermissionForCamera = permissionChecker.checkPermissionForPreflight(
-                sCameraPermission, attributionSource, String16(), AppOpsManager::OP_NONE)
-                != permission::PermissionChecker::PERMISSION_HARD_DENIED;
+                toString16(sCameraPermission), attributionSource, String16(),
+                AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
     if ((callingPid != getpid()) &&
             (deviceKind != SystemCameraKind::SYSTEM_ONLY_CAMERA) &&
             !checkPermissionForCamera) {
         res = cameraInfo->removePermissionEntries(
-                mCameraProviderManager->getProviderTagIdLocked(String8(cameraId).string()),
+                mCameraProviderManager->getProviderTagIdLocked(cameraId),
                 &tagsRemoved);
         if (res != OK) {
             cameraInfo->clear();
             return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Failed to remove camera"
                     " characteristics needing camera permission for device %s: %s (%d)",
-                    String8(cameraId).string(), strerror(-res), res);
+                    cameraId.c_str(), strerror(-res), res);
         }
     }
 
@@ -896,7 +878,7 @@
         if (res != OK) {
             cameraInfo->clear();
             return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Failed to insert camera "
-                    "keys needing permission for device %s: %s (%d)", String8(cameraId).string(),
+                    "keys needing permission for device %s: %s (%d)", cameraId.c_str(),
                     strerror(-res), res);
         }
     }
@@ -904,7 +886,7 @@
     return ret;
 }
 
-Status CameraService::getTorchStrengthLevel(const String16& cameraId,
+Status CameraService::getTorchStrengthLevel(const std::string& cameraId,
         int32_t* torchStrength) {
     ATRACE_CALL();
     Mutex::Autolock l(mServiceLock);
@@ -918,22 +900,21 @@
         return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, "Strength level should not be null.");
     }
 
-    status_t res = mCameraProviderManager->getTorchStrengthLevel(String8(cameraId).string(),
-        torchStrength);
+    status_t res = mCameraProviderManager->getTorchStrengthLevel(cameraId, torchStrength);
     if (res != OK) {
         return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Unable to retrieve torch "
-            "strength level for device %s: %s (%d)", String8(cameraId).string(),
+            "strength level for device %s: %s (%d)", cameraId.c_str(),
             strerror(-res), res);
     }
     ALOGI("%s: Torch strength level is: %d", __FUNCTION__, *torchStrength);
     return Status::ok();
 }
 
-String8 CameraService::getFormattedCurrentTime() {
+std::string CameraService::getFormattedCurrentTime() {
     time_t now = time(nullptr);
     char formattedTime[64];
     strftime(formattedTime, sizeof(formattedTime), "%m-%d %H:%M:%S", localtime(&now));
-    return String8(formattedTime);
+    return std::string(formattedTime);
 }
 
 Status CameraService::getCameraVendorTagDescriptor(
@@ -971,7 +952,7 @@
     BasicClient::BasicClient::sCameraService = nullptr;
 }
 
-std::pair<int, IPCTransport> CameraService::getDeviceVersion(const String8& cameraId,
+std::pair<int, IPCTransport> CameraService::getDeviceVersion(const std::string& cameraId,
         bool overrideToPortrait, int* portraitRotation, int* facing, int* orientation) {
     ATRACE_CALL();
 
@@ -980,18 +961,17 @@
     status_t res;
     hardware::hidl_version maxVersion{0,0};
     IPCTransport transport = IPCTransport::INVALID;
-    res = mCameraProviderManager->getHighestSupportedVersion(cameraId.string(),
-            &maxVersion, &transport);
+    res = mCameraProviderManager->getHighestSupportedVersion(cameraId, &maxVersion, &transport);
     if (res != OK || transport == IPCTransport::INVALID) {
         ALOGE("%s: Unable to get highest supported version for camera id %s", __FUNCTION__,
-                cameraId.string());
+                cameraId.c_str());
         return std::make_pair(-1, IPCTransport::INVALID) ;
     }
     deviceVersion = HARDWARE_DEVICE_API_VERSION(maxVersion.get_major(), maxVersion.get_minor());
 
     hardware::CameraInfo info;
     if (facing) {
-        res = mCameraProviderManager->getCameraInfo(cameraId.string(), overrideToPortrait,
+        res = mCameraProviderManager->getCameraInfo(cameraId, overrideToPortrait,
                 portraitRotation, &info);
         if (res != OK) {
             return std::make_pair(-1, IPCTransport::INVALID);
@@ -1023,8 +1003,8 @@
 }
 
 Status CameraService::makeClient(const sp<CameraService>& cameraService,
-        const sp<IInterface>& cameraCb, const String16& packageName, bool systemNativeClient,
-        const std::optional<String16>& featureId,  const String8& cameraId,
+        const sp<IInterface>& cameraCb, const std::string& packageName, bool systemNativeClient,
+        const std::optional<std::string>& featureId,  const std::string& cameraId,
         int api1CameraId, int facing, int sensorOrientation, int clientPid, uid_t clientUid,
         int servicePid, std::pair<int, IPCTransport> deviceVersionAndTransport,
         apiLevel effectiveApiLevel, bool overrideForPerfClass, bool overrideToPortrait,
@@ -1038,7 +1018,7 @@
                 ALOGE("Camera using old HAL version: %d", deviceVersion);
                 return STATUS_ERROR_FMT(ERROR_DEPRECATED_HAL,
                         "Camera device \"%s\" HAL version %d no longer supported",
-                        cameraId.string(), deviceVersion);
+                        cameraId.c_str(), deviceVersion);
                 break;
             case CAMERA_DEVICE_API_VERSION_3_0:
             case CAMERA_DEVICE_API_VERSION_3_1:
@@ -1054,13 +1034,14 @@
                 ALOGE("Unknown camera device HAL version: %d", deviceVersion);
                 return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
                         "Camera device \"%s\" has unknown HAL version %d",
-                        cameraId.string(), deviceVersion);
+                        cameraId.c_str(), deviceVersion);
         }
     }
     if (effectiveApiLevel == API_1) { // Camera1 API route
         sp<ICameraClient> tmp = static_cast<ICameraClient*>(cameraCb.get());
         *client = new Camera2Client(cameraService, tmp, cameraService->mCameraServiceProxyWrapper,
-                packageName, featureId, cameraId, api1CameraId, facing, sensorOrientation,
+                packageName, featureId, cameraId,
+                api1CameraId, facing, sensorOrientation,
                 clientPid, clientUid, servicePid, overrideForPerfClass, overrideToPortrait,
                 forceSlowJpegMode);
         ALOGI("%s: Camera1 API (legacy), override to portrait %d, forceSlowJpegMode %d",
@@ -1077,18 +1058,18 @@
     return Status::ok();
 }
 
-String8 CameraService::toString(std::set<userid_t> intSet) {
-    String8 s("");
+std::string CameraService::toString(std::set<userid_t> intSet) {
+    std::ostringstream s;
     bool first = true;
     for (userid_t i : intSet) {
         if (first) {
-            s.appendFormat("%d", i);
+            s << std::to_string(i);
             first = false;
         } else {
-            s.appendFormat(", %d", i);
+            s << ", " << std::to_string(i);
         }
     }
-    return s;
+    return std::move(s.str());
 }
 
 int32_t CameraService::mapToInterface(TorchModeStatus status) {
@@ -1154,13 +1135,12 @@
 Status CameraService::initializeShimMetadata(int cameraId) {
     int uid = CameraThreadState::getCallingUid();
 
-    String16 internalPackageName("cameraserver");
-    String8 id = String8::format("%d", cameraId);
+    std::string cameraIdStr = std::to_string(cameraId);
     Status ret = Status::ok();
     sp<Client> tmp = nullptr;
     if (!(ret = connectHelper<ICameraClient,Client>(
-            sp<ICameraClient>{nullptr}, id, cameraId,
-            internalPackageName, /*systemNativeClient*/ false, {}, uid, USE_CALLING_PID,
+            sp<ICameraClient>{nullptr}, cameraIdStr, cameraId,
+            kServiceName, /*systemNativeClient*/ false, {}, uid, USE_CALLING_PID,
             API_1, /*shimUpdateOnly*/ true, /*oomScoreOffset*/ 0,
             /*targetSdkVersion*/ __ANDROID_API_FUTURE__, /*overrideToPortrait*/ true,
             /*forceSlowJpegMode*/false, /*out*/ tmp)
@@ -1183,17 +1163,17 @@
         return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, "Parameters must not be null");
     }
 
-    String8 id = String8::format("%d", cameraId);
+    std::string cameraIdStr = std::to_string(cameraId);
 
     // Check if we already have parameters
     {
         // Scope for service lock
         Mutex::Autolock lock(mServiceLock);
-        auto cameraState = getCameraState(id);
+        auto cameraState = getCameraState(cameraIdStr);
         if (cameraState == nullptr) {
-            ALOGE("%s: Invalid camera ID: %s", __FUNCTION__, id.string());
+            ALOGE("%s: Invalid camera ID: %s", __FUNCTION__, cameraIdStr.c_str());
             return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                    "Invalid camera ID: %s", id.string());
+                    "Invalid camera ID: %s", cameraIdStr.c_str());
         }
         CameraParameters p = cameraState->getShimParams();
         if (!p.isEmpty()) {
@@ -1214,11 +1194,11 @@
     {
         // Scope for service lock
         Mutex::Autolock lock(mServiceLock);
-        auto cameraState = getCameraState(id);
+        auto cameraState = getCameraState(cameraIdStr);
         if (cameraState == nullptr) {
-            ALOGE("%s: Invalid camera ID: %s", __FUNCTION__, id.string());
+            ALOGE("%s: Invalid camera ID: %s", __FUNCTION__, cameraIdStr.c_str());
             return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                    "Invalid camera ID: %s", id.string());
+                    "Invalid camera ID: %s", cameraIdStr.c_str());
         }
         CameraParameters p = cameraState->getShimParams();
         if (!p.isEmpty()) {
@@ -1244,12 +1224,13 @@
     }
 }
 
-static status_t getUidForPackage(String16 packageName, int userId, /*inout*/uid_t& uid, int err) {
+static status_t getUidForPackage(const std::string &packageName, int userId, /*inout*/uid_t& uid,
+        int err) {
     PermissionController pc;
-    uid = pc.getPackageUid(packageName, 0);
+    uid = pc.getPackageUid(toString16(packageName), 0);
     if (uid <= 0) {
-        ALOGE("Unknown package: '%s'", String8(packageName).string());
-        dprintf(err, "Unknown package: '%s'\n", String8(packageName).string());
+        ALOGE("Unknown package: '%s'", packageName.c_str());
+        dprintf(err, "Unknown package: '%s'\n", packageName.c_str());
         return BAD_VALUE;
     }
 
@@ -1263,8 +1244,8 @@
     return NO_ERROR;
 }
 
-Status CameraService::validateConnectLocked(const String8& cameraId,
-        const String8& clientName8, /*inout*/int& clientUid, /*inout*/int& clientPid,
+Status CameraService::validateConnectLocked(const std::string& cameraId,
+        const std::string& clientName8, /*inout*/int& clientUid, /*inout*/int& clientPid,
         /*out*/int& originalClientPid) const {
 
 #ifdef __BRILLO__
@@ -1286,14 +1267,14 @@
         ALOGE("CameraService::connect X (PID %d) rejected (camera HAL module not loaded)",
                 callingPid);
         return STATUS_ERROR_FMT(ERROR_DISCONNECTED,
-                "No camera HAL module available to open camera device \"%s\"", cameraId.string());
+                "No camera HAL module available to open camera device \"%s\"", cameraId.c_str());
     }
 
     if (getCameraState(cameraId) == nullptr) {
         ALOGE("CameraService::connect X (PID %d) rejected (invalid camera ID %s)", callingPid,
-                cameraId.string());
+                cameraId.c_str());
         return STATUS_ERROR_FMT(ERROR_DISCONNECTED,
-                "No camera device with ID \"%s\" available", cameraId.string());
+                "No camera device with ID \"%s\" available", cameraId.c_str());
     }
 
     status_t err = checkIfDeviceIsUsable(cameraId);
@@ -1302,17 +1283,17 @@
             case -ENODEV:
             case -EBUSY:
                 return STATUS_ERROR_FMT(ERROR_DISCONNECTED,
-                        "No camera device with ID \"%s\" currently available", cameraId.string());
+                        "No camera device with ID \"%s\" currently available", cameraId.c_str());
             default:
                 return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
-                        "Unknown error connecting to ID \"%s\"", cameraId.string());
+                        "Unknown error connecting to ID \"%s\"", cameraId.c_str());
         }
     }
     return Status::ok();
 }
 
-Status CameraService::validateClientPermissionsLocked(const String8& cameraId,
-        const String8& clientName8, int& clientUid, int& clientPid,
+Status CameraService::validateClientPermissionsLocked(const std::string& cameraId,
+        const std::string& clientName, int& clientUid, int& clientPid,
         /*out*/int& originalClientPid) const {
     permission::PermissionChecker permissionChecker;
     AttributionSourceState attributionSource{};
@@ -1329,8 +1310,8 @@
         return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
                 "Untrusted caller (calling PID %d, UID %d) trying to "
                 "forward camera access to camera %s for client %s (PID %d, UID %d)",
-                callingPid, callingUid, cameraId.string(),
-                clientName8.string(), clientUid, clientPid);
+                callingPid, callingUid, cameraId.c_str(),
+                clientName.c_str(), clientUid, clientPid);
     }
 
     // Check if we can trust clientPid
@@ -1342,21 +1323,21 @@
         return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
                 "Untrusted caller (calling PID %d, UID %d) trying to "
                 "forward camera access to camera %s for client %s (PID %d, UID %d)",
-                callingPid, callingUid, cameraId.string(),
-                clientName8.string(), clientUid, clientPid);
+                callingPid, callingUid, cameraId.c_str(),
+                clientName.c_str(), clientUid, clientPid);
     }
 
     if (shouldRejectSystemCameraConnection(cameraId)) {
         ALOGW("Attempting to connect to system-only camera id %s, connection rejected",
                 cameraId.c_str());
         return STATUS_ERROR_FMT(ERROR_DISCONNECTED, "No camera device with ID \"%s\" is"
-                                "available", cameraId.string());
+                                "available", cameraId.c_str());
     }
     SystemCameraKind deviceKind = SystemCameraKind::PUBLIC;
     if (getSystemCameraKind(cameraId, &deviceKind) != OK) {
-        ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, cameraId.string());
+        ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, cameraId.c_str());
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT, "No camera device with ID \"%s\""
-                "found while trying to query device kind", cameraId.string());
+                "found while trying to query device kind", cameraId.c_str());
 
     }
 
@@ -1365,27 +1346,27 @@
     // android.permission.SYSTEM_CAMERA for system only camera devices).
     attributionSource.pid = clientPid;
     attributionSource.uid = clientUid;
-    attributionSource.packageName = clientName8;
+    attributionSource.packageName = clientName;
     bool checkPermissionForCamera = permissionChecker.checkPermissionForPreflight(
-            sCameraPermission, attributionSource, String16(), AppOpsManager::OP_NONE)
-            != permission::PermissionChecker::PERMISSION_HARD_DENIED;
+            toString16(sCameraPermission), attributionSource, String16(),
+            AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
     if (callingPid != getpid() &&
                 (deviceKind != SystemCameraKind::SYSTEM_ONLY_CAMERA) && !checkPermissionForCamera) {
         ALOGE("Permission Denial: can't use the camera pid=%d, uid=%d", clientPid, clientUid);
         return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
                 "Caller \"%s\" (PID %d, UID %d) cannot open camera \"%s\" without camera permission",
-                clientName8.string(), clientUid, clientPid, cameraId.string());
+                clientName.c_str(), clientUid, clientPid, cameraId.c_str());
     }
 
     // Make sure the UID is in an active state to use the camera
-    if (!mUidPolicy->isUidActive(callingUid, String16(clientName8))) {
+    if (!mUidPolicy->isUidActive(callingUid, clientName)) {
         int32_t procState = mUidPolicy->getProcState(callingUid);
         ALOGE("Access Denial: can't use the camera from an idle UID pid=%d, uid=%d",
             clientPid, clientUid);
         return STATUS_ERROR_FMT(ERROR_DISABLED,
                 "Caller \"%s\" (PID %d, UID %d) cannot open camera \"%s\" from background ("
                 "calling UID %d proc state %" PRId32 ")",
-                clientName8.string(), clientUid, clientPid, cameraId.string(),
+                clientName.c_str(), clientUid, clientPid, cameraId.c_str(),
                 callingUid, procState);
     }
 
@@ -1394,7 +1375,7 @@
         ALOGE("Access Denial: cannot use the camera when sensor privacy is enabled");
         return STATUS_ERROR_FMT(ERROR_DISABLED,
                 "Caller \"%s\" (PID %d, UID %d) cannot open camera \"%s\" when sensor privacy "
-                "is enabled", clientName8.string(), clientUid, clientPid, cameraId.string());
+                "is enabled", clientName.c_str(), clientUid, clientPid, cameraId.c_str());
     }
 
     // Only use passed in clientPid to check permission. Use calling PID as the client PID that's
@@ -1410,32 +1391,32 @@
             (mAllowedUsers.find(clientUserId) == mAllowedUsers.end())) {
         ALOGE("CameraService::connect X (PID %d) rejected (cannot connect from "
                 "device user %d, currently allowed device users: %s)", callingPid, clientUserId,
-                toString(mAllowedUsers).string());
+                toString(mAllowedUsers).c_str());
         return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
                 "Callers from device user %d are not currently allowed to connect to camera \"%s\"",
-                clientUserId, cameraId.string());
+                clientUserId, cameraId.c_str());
     }
 
     return Status::ok();
 }
 
-status_t CameraService::checkIfDeviceIsUsable(const String8& cameraId) const {
+status_t CameraService::checkIfDeviceIsUsable(const std::string& cameraId) const {
     auto cameraState = getCameraState(cameraId);
     int callingPid = CameraThreadState::getCallingPid();
     if (cameraState == nullptr) {
         ALOGE("CameraService::connect X (PID %d) rejected (invalid camera ID %s)", callingPid,
-                cameraId.string());
+                cameraId.c_str());
         return -ENODEV;
     }
 
     StatusInternal currentStatus = cameraState->getStatus();
     if (currentStatus == StatusInternal::NOT_PRESENT) {
         ALOGE("CameraService::connect X (PID %d) rejected (camera %s is not connected)",
-                callingPid, cameraId.string());
+                callingPid, cameraId.c_str());
         return -ENODEV;
     } else if (currentStatus == StatusInternal::ENUMERATING) {
         ALOGE("CameraService::connect X (PID %d) rejected, (camera %s is initializing)",
-                callingPid, cameraId.string());
+                callingPid, cameraId.c_str());
         return -EBUSY;
     }
 
@@ -1452,13 +1433,13 @@
     auto evicted = mActiveClientManager.addAndEvict(clientDescriptor);
 
     logConnected(desc->getKey(), static_cast<int>(desc->getOwnerId()),
-            String8(client->getPackageName()));
+            client->getPackageName());
 
     if (evicted.size() > 0) {
         // This should never happen - clients should already have been removed in disconnect
         for (auto& i : evicted) {
             ALOGE("%s: Invalid state: Client for camera %s was not removed in disconnect",
-                    __FUNCTION__, i->getKey().string());
+                    __FUNCTION__, i->getKey().c_str());
         }
 
         LOG_ALWAYS_FATAL("%s: Invalid state for CameraService, clients not evicted properly",
@@ -1476,12 +1457,12 @@
     }
 }
 
-status_t CameraService::handleEvictionsLocked(const String8& cameraId, int clientPid,
-        apiLevel effectiveApiLevel, const sp<IBinder>& remoteCallback, const String8& packageName,
-        int oomScoreOffset, bool systemNativeClient,
+status_t CameraService::handleEvictionsLocked(const std::string& cameraId, int clientPid,
+        apiLevel effectiveApiLevel, const sp<IBinder>& remoteCallback,
+        const std::string& packageName, int oomScoreOffset, bool systemNativeClient,
         /*out*/
         sp<BasicClient>* client,
-        std::shared_ptr<resource_policy::ClientDescriptor<String8, sp<BasicClient>>>* partial) {
+        std::shared_ptr<resource_policy::ClientDescriptor<std::string, sp<BasicClient>>>* partial) {
     ATRACE_CALL();
     status_t ret = NO_ERROR;
     std::vector<DescriptorPtr> evictedClients;
@@ -1539,7 +1520,7 @@
         auto state = getCameraState(cameraId);
         if (state == nullptr) {
             ALOGE("CameraService::connect X (PID %d) rejected (no camera device with ID %s)",
-                clientPid, cameraId.string());
+                clientPid, cameraId.c_str());
             // Should never get here because validateConnectLocked should have errored out
             return BAD_VALUE;
         }
@@ -1567,25 +1548,25 @@
                     " priority).", clientPid);
 
             sp<BasicClient> clientSp = clientDescriptor->getValue();
-            String8 curTime = getFormattedCurrentTime();
+            std::string curTime = getFormattedCurrentTime();
             auto incompatibleClients =
                     mActiveClientManager.getIncompatibleClients(clientDescriptor);
 
-            String8 msg = String8::format("%s : DENIED connect device %s client for package %s "
-                    "(PID %d, score %d state %d) due to eviction policy", curTime.string(),
-                    cameraId.string(), packageName.string(), clientPid,
+            std::string msg = fmt::sprintf("%s : DENIED connect device %s client for package %s "
+                    "(PID %d, score %d state %d) due to eviction policy", curTime.c_str(),
+                    cameraId.c_str(), packageName.c_str(), clientPid,
                     clientPriority.getScore(), clientPriority.getState());
 
             for (auto& i : incompatibleClients) {
-                msg.appendFormat("\n   - Blocked by existing device %s client for package %s"
+                msg += fmt::sprintf("\n   - Blocked by existing device %s client for package %s"
                         "(PID %" PRId32 ", score %" PRId32 ", state %" PRId32 ")",
-                        i->getKey().string(),
-                        String8{i->getValue()->getPackageName()}.string(),
+                        i->getKey().c_str(),
+                        i->getValue()->getPackageName().c_str(),
                         i->getOwnerId(), i->getPriority().getScore(),
                         i->getPriority().getState());
                 ALOGE("   Conflicts with: Device %s, client package %s (PID %"
-                        PRId32 ", score %" PRId32 ", state %" PRId32 ")", i->getKey().string(),
-                        String8{i->getValue()->getPackageName()}.string(), i->getOwnerId(),
+                        PRId32 ", score %" PRId32 ", state %" PRId32 ")", i->getKey().c_str(),
+                        i->getValue()->getPackageName().c_str(), i->getOwnerId(),
                         i->getPriority().getScore(), i->getPriority().getState());
             }
 
@@ -1614,17 +1595,17 @@
             }
 
             ALOGE("CameraService::connect evicting conflicting client for camera ID %s",
-                    i->getKey().string());
+                    i->getKey().c_str());
             evictedClients.push_back(i);
 
             // Log the clients evicted
-            logEvent(String8::format("EVICT device %s client held by package %s (PID"
+            logEvent(fmt::sprintf("EVICT device %s client held by package %s (PID"
                     " %" PRId32 ", score %" PRId32 ", state %" PRId32 ")\n - Evicted by device %s client for"
                     " package %s (PID %d, score %" PRId32 ", state %" PRId32 ")",
-                    i->getKey().string(), String8{clientSp->getPackageName()}.string(),
+                    i->getKey().c_str(), clientSp->getPackageName().c_str(),
                     i->getOwnerId(), i->getPriority().getScore(),
-                    i->getPriority().getState(), cameraId.string(),
-                    packageName.string(), clientPid, clientPriority.getScore(),
+                    i->getPriority().getState(), cameraId.c_str(),
+                    packageName.c_str(), clientPid, clientPriority.getScore(),
                     clientPriority.getState()));
 
             // Notify the client of disconnection
@@ -1650,18 +1631,18 @@
 
     for (const auto& i : evictedClients) {
         ALOGV("%s: Waiting for disconnect to complete for client for device %s (PID %" PRId32 ")",
-                __FUNCTION__, i->getKey().string(), i->getOwnerId());
+                __FUNCTION__, i->getKey().c_str(), i->getOwnerId());
         ret = mActiveClientManager.waitUntilRemoved(i, DEFAULT_DISCONNECT_TIMEOUT_NS);
         if (ret == TIMED_OUT) {
             ALOGE("%s: Timed out waiting for client for device %s to disconnect, "
-                    "current clients:\n%s", __FUNCTION__, i->getKey().string(),
-                    mActiveClientManager.toString().string());
+                    "current clients:\n%s", __FUNCTION__, i->getKey().c_str(),
+                    mActiveClientManager.toString().c_str());
             return -EBUSY;
         }
         if (ret != NO_ERROR) {
             ALOGE("%s: Received error waiting for client for device %s to disconnect: %s (%d), "
-                    "current clients:\n%s", __FUNCTION__, i->getKey().string(), strerror(-ret),
-                    ret, mActiveClientManager.toString().string());
+                    "current clients:\n%s", __FUNCTION__, i->getKey().c_str(), strerror(-ret),
+                    ret, mActiveClientManager.toString().c_str());
             return ret;
         }
     }
@@ -1683,7 +1664,7 @@
 Status CameraService::connect(
         const sp<ICameraClient>& cameraClient,
         int api1CameraId,
-        const String16& clientPackageName,
+        const std::string& clientPackageName,
         int clientUid,
         int clientPid,
         int targetSdkVersion,
@@ -1695,16 +1676,16 @@
     ATRACE_CALL();
     Status ret = Status::ok();
 
-    String8 id = cameraIdIntToStr(api1CameraId);
+    std::string cameraIdStr = cameraIdIntToStr(api1CameraId);
     sp<Client> client = nullptr;
-    ret = connectHelper<ICameraClient,Client>(cameraClient, id, api1CameraId,
-            clientPackageName,/*systemNativeClient*/ false, {}, clientUid, clientPid, API_1,
+    ret = connectHelper<ICameraClient,Client>(cameraClient, cameraIdStr, api1CameraId,
+            clientPackageName, /*systemNativeClient*/ false, {}, clientUid, clientPid, API_1,
             /*shimUpdateOnly*/ false, /*oomScoreOffset*/ 0, targetSdkVersion,
             overrideToPortrait, forceSlowJpegMode, /*out*/client);
 
     if(!ret.isOk()) {
-        logRejected(id, CameraThreadState::getCallingPid(), String8(clientPackageName),
-                ret.toString8());
+        logRejected(cameraIdStr, CameraThreadState::getCallingPid(), clientPackageName,
+                toStdString(ret.toString8()));
         return ret;
     }
 
@@ -1735,7 +1716,7 @@
     return false;
 }
 
-bool CameraService::shouldRejectSystemCameraConnection(const String8& cameraId) const {
+bool CameraService::shouldRejectSystemCameraConnection(const std::string& cameraId) const {
     // Rules for rejection:
     // 1) If cameraserver tries to access this camera device, accept the
     //    connection.
@@ -1780,9 +1761,9 @@
 
 Status CameraService::connectDevice(
         const sp<hardware::camera2::ICameraDeviceCallbacks>& cameraCb,
-        const String16& cameraId,
-        const String16& clientPackageName,
-        const std::optional<String16>& clientFeatureId,
+        const std::string& cameraId,
+        const std::string& clientPackageName,
+        const std::optional<std::string>& clientFeatureId,
         int clientUid, int oomScoreOffset, int targetSdkVersion,
         bool overrideToPortrait,
         /*out*/
@@ -1790,25 +1771,24 @@
 
     ATRACE_CALL();
     Status ret = Status::ok();
-    String8 id = String8(cameraId);
     sp<CameraDeviceClient> client = nullptr;
-    String16 clientPackageNameAdj = clientPackageName;
+    std::string clientPackageNameAdj = clientPackageName;
     int callingPid = CameraThreadState::getCallingPid();
     bool systemNativeClient = false;
     if (doesClientHaveSystemUid() && (clientPackageNameAdj.size() == 0)) {
         std::string systemClient =
-                StringPrintf("client.pid<%d>", CameraThreadState::getCallingPid());
-        clientPackageNameAdj = String16(systemClient.c_str());
+                fmt::sprintf("client.pid<%d>", CameraThreadState::getCallingPid());
+        clientPackageNameAdj = systemClient;
         systemNativeClient = true;
     }
 
     if (oomScoreOffset < 0) {
-        String8 msg =
-                String8::format("Cannot increase the priority of a client %s pid %d for "
-                        "camera id %s", String8(clientPackageNameAdj).string(), callingPid,
-                        id.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg =
+                fmt::sprintf("Cannot increase the priority of a client %s pid %d for "
+                        "camera id %s", clientPackageNameAdj.c_str(), callingPid,
+                        cameraId.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     userid_t clientUserId = multiuser_get_user_id(clientUid);
@@ -1818,32 +1798,30 @@
     }
 
     if (mCameraServiceProxyWrapper->isCameraDisabled(clientUserId)) {
-        String8 msg =
-                String8::format("Camera disabled by device policy");
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(ERROR_DISABLED, msg.string());
+        std::string msg = "Camera disabled by device policy";
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(ERROR_DISABLED, msg.c_str());
     }
 
     // enforce system camera permissions
     if (oomScoreOffset > 0 &&
             !hasPermissionsForSystemCamera(callingPid, CameraThreadState::getCallingUid()) &&
             !isTrustedCallingUid(CameraThreadState::getCallingUid())) {
-        String8 msg =
-                String8::format("Cannot change the priority of a client %s pid %d for "
+        std::string msg = fmt::sprintf("Cannot change the priority of a client %s pid %d for "
                         "camera id %s without SYSTEM_CAMERA permissions",
-                        String8(clientPackageNameAdj).string(), callingPid, id.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(ERROR_PERMISSION_DENIED, msg.string());
+                        clientPackageNameAdj.c_str(), callingPid, cameraId.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(ERROR_PERMISSION_DENIED, msg.c_str());
     }
 
-    ret = connectHelper<hardware::camera2::ICameraDeviceCallbacks,CameraDeviceClient>(cameraCb, id,
-            /*api1CameraId*/-1, clientPackageNameAdj, systemNativeClient,clientFeatureId,
+    ret = connectHelper<hardware::camera2::ICameraDeviceCallbacks,CameraDeviceClient>(cameraCb,
+            cameraId, /*api1CameraId*/-1, clientPackageNameAdj, systemNativeClient, clientFeatureId,
             clientUid, USE_CALLING_PID, API_2, /*shimUpdateOnly*/ false, oomScoreOffset,
             targetSdkVersion, overrideToPortrait, /*forceSlowJpegMode*/false,
             /*out*/client);
 
     if(!ret.isOk()) {
-        logRejected(id, callingPid, String8(clientPackageNameAdj), ret.toString8());
+        logRejected(cameraId, callingPid, clientPackageNameAdj, toStdString(ret.toString8()));
         return ret;
     }
 
@@ -1874,11 +1852,11 @@
     return ret;
 }
 
-String16 CameraService::getPackageNameFromUid(int clientUid) {
-    String16 packageName("");
+std::string CameraService::getPackageNameFromUid(int clientUid) {
+    std::string packageName("");
 
     sp<IServiceManager> sm = defaultServiceManager();
-    sp<IBinder> binder = sm->getService(String16(kPermissionServiceName));
+    sp<IBinder> binder = sm->getService(toString16(kPermissionServiceName));
     if (binder == 0) {
         ALOGE("Cannot get permission service");
         // Return empty package name and the further interaction
@@ -1899,22 +1877,22 @@
     }
 
     // Arbitrarily pick the first name in the list
-    packageName = packages[0];
+    packageName = toStdString(packages[0]);
 
     return packageName;
 }
 
 template<class CALLBACK, class CLIENT>
-Status CameraService::connectHelper(const sp<CALLBACK>& cameraCb, const String8& cameraId,
-        int api1CameraId, const String16& clientPackageNameMaybe, bool systemNativeClient,
-        const std::optional<String16>& clientFeatureId, int clientUid, int clientPid,
+Status CameraService::connectHelper(const sp<CALLBACK>& cameraCb, const std::string& cameraId,
+        int api1CameraId, const std::string& clientPackageNameMaybe, bool systemNativeClient,
+        const std::optional<std::string>& clientFeatureId, int clientUid, int clientPid,
         apiLevel effectiveApiLevel, bool shimUpdateOnly, int oomScoreOffset, int targetSdkVersion,
         bool overrideToPortrait, bool forceSlowJpegMode,
         /*out*/sp<CLIENT>& device) {
     binder::Status ret = binder::Status::ok();
 
     bool isNonSystemNdk = false;
-    String16 clientPackageName;
+    std::string clientPackageName;
     if (clientPackageNameMaybe.size() <= 0) {
         // NDK calls don't come with package names, but we need one for various cases.
         // Generally, there's a 1:1 mapping between UID and package name, but shared UIDs
@@ -1929,14 +1907,12 @@
         clientPackageName = clientPackageNameMaybe;
     }
 
-    String8 clientName8(clientPackageName);
-
     int originalClientPid = 0;
 
     int packagePid = (clientPid == USE_CALLING_PID) ?
         CameraThreadState::getCallingPid() : clientPid;
     ALOGI("CameraService::connect call (PID %d \"%s\", camera ID %s) and "
-            "Camera API version %d", packagePid, clientName8.string(), cameraId.string(),
+            "Camera API version %d", packagePid, clientPackageName.c_str(), cameraId.c_str(),
             static_cast<int>(effectiveApiLevel));
 
     nsecs_t openTimeNs = systemTime();
@@ -1955,11 +1931,11 @@
                     , clientPid);
             return STATUS_ERROR_FMT(ERROR_MAX_CAMERAS_IN_USE,
                     "Cannot open camera %s for \"%s\" (PID %d): Too many other clients connecting",
-                    cameraId.string(), clientName8.string(), clientPid);
+                    cameraId.c_str(), clientPackageName.c_str(), clientPid);
         }
 
         // Enforce client permissions and do basic validity checks
-        if(!(ret = validateConnectLocked(cameraId, clientName8,
+        if(!(ret = validateConnectLocked(cameraId, clientPackageName,
                 /*inout*/clientUid, /*inout*/clientPid, /*out*/originalClientPid)).isOk()) {
             return ret;
         }
@@ -1976,27 +1952,27 @@
         status_t err;
 
         sp<BasicClient> clientTmp = nullptr;
-        std::shared_ptr<resource_policy::ClientDescriptor<String8, sp<BasicClient>>> partial;
+        std::shared_ptr<resource_policy::ClientDescriptor<std::string, sp<BasicClient>>> partial;
         if ((err = handleEvictionsLocked(cameraId, originalClientPid, effectiveApiLevel,
-                IInterface::asBinder(cameraCb), clientName8, oomScoreOffset, systemNativeClient,
-                /*out*/&clientTmp, /*out*/&partial)) != NO_ERROR) {
+                IInterface::asBinder(cameraCb), clientPackageName, oomScoreOffset,
+                systemNativeClient, /*out*/&clientTmp, /*out*/&partial)) != NO_ERROR) {
             switch (err) {
                 case -ENODEV:
                     return STATUS_ERROR_FMT(ERROR_DISCONNECTED,
                             "No camera device with ID \"%s\" currently available",
-                            cameraId.string());
+                            cameraId.c_str());
                 case -EBUSY:
                     return STATUS_ERROR_FMT(ERROR_CAMERA_IN_USE,
                             "Higher-priority client using camera, ID \"%s\" currently unavailable",
-                            cameraId.string());
+                            cameraId.c_str());
                 case -EUSERS:
                     return STATUS_ERROR_FMT(ERROR_MAX_CAMERAS_IN_USE,
                             "Too many cameras already open, cannot open camera \"%s\"",
-                            cameraId.string());
+                            cameraId.c_str());
                 default:
                     return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
                             "Unexpected error %s (%d) opening camera \"%s\"",
-                            strerror(-err), err, cameraId.string());
+                            strerror(-err), err, cameraId.c_str());
             }
         }
 
@@ -2014,17 +1990,17 @@
                 getDeviceVersion(cameraId, overrideToPortrait, /*out*/&portraitRotation,
                         /*out*/&facing, /*out*/&orientation);
         if (facing == -1) {
-            ALOGE("%s: Unable to get camera device \"%s\"  facing", __FUNCTION__, cameraId.string());
+            ALOGE("%s: Unable to get camera device \"%s\"  facing", __FUNCTION__, cameraId.c_str());
             return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
-                    "Unable to get camera device \"%s\" facing", cameraId.string());
+                    "Unable to get camera device \"%s\" facing", cameraId.c_str());
         }
 
         sp<BasicClient> tmp = nullptr;
         bool overrideForPerfClass = SessionConfigurationUtils::targetPerfClassPrimaryCamera(
-                mPerfClassPrimaryCameraIds, cameraId.string(), targetSdkVersion);
+                mPerfClassPrimaryCameraIds, cameraId, targetSdkVersion);
         if(!(ret = makeClient(this, cameraCb, clientPackageName, systemNativeClient,
-                clientFeatureId, cameraId, api1CameraId, facing, orientation,
-                clientPid, clientUid, getpid(),
+                clientFeatureId, cameraId, api1CameraId, facing,
+                orientation, clientPid, clientUid, getpid(),
                 deviceVersionAndTransport, effectiveApiLevel, overrideForPerfClass,
                 overrideToPortrait, forceSlowJpegMode,
                 /*out*/&tmp)).isOk()) {
@@ -2035,7 +2011,7 @@
         LOG_ALWAYS_FATAL_IF(client.get() == nullptr, "%s: CameraService in invalid state",
                 __FUNCTION__);
 
-        String8 monitorTags = isClientWatched(client.get()) ? mMonitorTags : String8("");
+        std::string monitorTags = isClientWatched(client.get()) ? mMonitorTags : std::string();
         err = client->initialize(mCameraProviderManager, monitorTags);
         if (err != OK) {
             ALOGE("%s: Could not initialize client from HAL.", __FUNCTION__);
@@ -2043,24 +2019,24 @@
             switch(err) {
                 case BAD_VALUE:
                     return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                            "Illegal argument to HAL module for camera \"%s\"", cameraId.string());
+                            "Illegal argument to HAL module for camera \"%s\"", cameraId.c_str());
                 case -EBUSY:
                     return STATUS_ERROR_FMT(ERROR_CAMERA_IN_USE,
-                            "Camera \"%s\" is already open", cameraId.string());
+                            "Camera \"%s\" is already open", cameraId.c_str());
                 case -EUSERS:
                     return STATUS_ERROR_FMT(ERROR_MAX_CAMERAS_IN_USE,
                             "Too many cameras already open, cannot open camera \"%s\"",
-                            cameraId.string());
+                            cameraId.c_str());
                 case PERMISSION_DENIED:
                     return STATUS_ERROR_FMT(ERROR_PERMISSION_DENIED,
-                            "No permission to open camera \"%s\"", cameraId.string());
+                            "No permission to open camera \"%s\"", cameraId.c_str());
                 case -EACCES:
                     return STATUS_ERROR_FMT(ERROR_DISABLED,
-                            "Camera \"%s\" disabled by policy", cameraId.string());
+                            "Camera \"%s\" disabled by policy", cameraId.c_str());
                 case -ENODEV:
                 default:
                     return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
-                            "Failed to initialize camera \"%s\": %s (%d)", cameraId.string(),
+                            "Failed to initialize camera \"%s\": %s (%d)", cameraId.c_str(),
                             strerror(-err), err);
             }
         }
@@ -2077,7 +2053,7 @@
                 cameraState->setShimParams(params);
             } else {
                 ALOGE("%s: Cannot update shim parameters for camera %s, no such device exists.",
-                        __FUNCTION__, cameraId.string());
+                        __FUNCTION__, cameraId.c_str());
             }
         }
 
@@ -2128,7 +2104,7 @@
         } else if (isCameraPrivacyEnabled) {
             // no camera mute supported, but privacy is on! => disconnect
             ALOGI("Camera mute not supported for package: %s, camera id: %s",
-                    String8(client->getPackageName()).string(), cameraId.string());
+                    client->getPackageName().c_str(), cameraId.c_str());
             // Do not hold mServiceLock while disconnecting clients, but
             // retain the condition blocking other clients from connecting
             // in mServiceLockWrapper if held.
@@ -2144,7 +2120,7 @@
             mServiceLock.lock();
 
             return STATUS_ERROR_FMT(ERROR_DISABLED,
-                    "Camera \"%s\" disabled due to camera mute", cameraId.string());
+                    "Camera \"%s\" disabled due to camera mute", cameraId.c_str());
         }
 
         if (shimUpdateOnly) {
@@ -2182,7 +2158,7 @@
                 if(res != OK) {
                     return STATUS_ERROR_FMT(ERROR_DISCONNECTED,
                             "No camera device with ID \"%s\" currently available",
-                            mInjectionExternalCamId.string());
+                            mInjectionExternalCamId.c_str());
                 }
                 res = clientSp->injectCamera(mInjectionExternalCamId, mCameraProviderManager);
                 if (res != OK) {
@@ -2190,7 +2166,7 @@
                 }
             } else {
                 ALOGE("%s: Internal camera ID = %s 's client does not exist!",
-                        __FUNCTION__, mInjectionInternalCamId.string());
+                        __FUNCTION__, mInjectionInternalCamId.c_str());
                 res = NO_INIT;
                 mInjectionStatusListener->notifyInjectionError(mInjectionExternalCamId, res);
             }
@@ -2200,7 +2176,8 @@
     return ret;
 }
 
-status_t CameraService::addOfflineClient(String8 cameraId, sp<BasicClient> offlineClient) {
+status_t CameraService::addOfflineClient(const std::string &cameraId,
+        sp<BasicClient> offlineClient) {
     if (offlineClient.get() == nullptr) {
         return BAD_VALUE;
     }
@@ -2229,7 +2206,7 @@
         const auto& onlinePriority = onlineClientDesc->getPriority();
         auto offlineClientDesc = CameraClientManager::makeClientDescriptor(
                 kOfflineDevice + onlineClientDesc->getKey(), offlineClient, /*cost*/ 0,
-                /*conflictingKeys*/ std::set<String8>(), onlinePriority.getScore(),
+                /*conflictingKeys*/ std::set<std::string>(), onlinePriority.getScore(),
                 onlineClientDesc->getOwnerId(), onlinePriority.getState(),
                 // native clients don't have offline processing support.
                 /*ommScoreOffset*/ 0, /*systemNativeClient*/false);
@@ -2245,7 +2222,8 @@
             return BAD_VALUE;
         }
 
-        String8 monitorTags = isClientWatched(offlineClient.get()) ? mMonitorTags : String8("");
+        std::string monitorTags = isClientWatched(offlineClient.get())
+                ? mMonitorTags : std::string();
         auto err = offlineClient->initialize(mCameraProviderManager, monitorTags);
         if (err != OK) {
             ALOGE("%s: Could not initialize offline client.", __FUNCTION__);
@@ -2256,7 +2234,7 @@
         if (evicted.size() > 0) {
             for (auto& i : evicted) {
                 ALOGE("%s: Invalid state: Offline client for camera %s was not removed ",
-                        __FUNCTION__, i->getKey().string());
+                        __FUNCTION__, i->getKey().c_str());
             }
 
             LOG_ALWAYS_FATAL("%s: Invalid state for CameraService, offline clients not evicted "
@@ -2267,7 +2245,7 @@
 
         logConnectedOffline(offlineClientDesc->getKey(),
                 static_cast<int>(offlineClientDesc->getOwnerId()),
-                String8(offlineClient->getPackageName()));
+                offlineClient->getPackageName());
 
         sp<IBinder> remoteCallback = offlineClient->getRemote();
         if (remoteCallback != nullptr) {
@@ -2278,8 +2256,8 @@
     return OK;
 }
 
-Status CameraService::turnOnTorchWithStrengthLevel(const String16& cameraId, int32_t torchStrength,
-        const sp<IBinder>& clientBinder) {
+Status CameraService::turnOnTorchWithStrengthLevel(const std::string& cameraId,
+        int32_t torchStrength, const sp<IBinder>& clientBinder) {
     Mutex::Autolock lock(mServiceLock);
 
     ATRACE_CALL();
@@ -2289,60 +2267,59 @@
                 "Torch client binder in null.");
     }
 
-    String8 id = String8(cameraId.string());
     int uid = CameraThreadState::getCallingUid();
 
-    if (shouldRejectSystemCameraConnection(id)) {
+    if (shouldRejectSystemCameraConnection(cameraId)) {
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT, "Unable to change the strength level"
-                "for system only device %s: ", id.string());
+                "for system only device %s: ", cameraId.c_str());
     }
 
     // verify id is valid
-    auto state = getCameraState(id);
+    auto state = getCameraState(cameraId);
     if (state == nullptr) {
-        ALOGE("%s: camera id is invalid %s", __FUNCTION__, id.string());
+        ALOGE("%s: camera id is invalid %s", __FUNCTION__, cameraId.c_str());
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-            "Camera ID \"%s\" is a not valid camera ID", id.string());
+            "Camera ID \"%s\" is a not valid camera ID", cameraId.c_str());
     }
 
     StatusInternal cameraStatus = state->getStatus();
     if (cameraStatus != StatusInternal::NOT_AVAILABLE &&
             cameraStatus != StatusInternal::PRESENT) {
-        ALOGE("%s: camera id is invalid %s, status %d", __FUNCTION__, id.string(),
+        ALOGE("%s: camera id is invalid %s, status %d", __FUNCTION__, cameraId.c_str(),
             (int)cameraStatus);
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                "Camera ID \"%s\" is a not valid camera ID", id.string());
+                "Camera ID \"%s\" is a not valid camera ID", cameraId.c_str());
     }
 
     {
         Mutex::Autolock al(mTorchStatusMutex);
         TorchModeStatus status;
-        status_t err = getTorchStatusLocked(id, &status);
+        status_t err = getTorchStatusLocked(cameraId, &status);
         if (err != OK) {
             if (err == NAME_NOT_FOUND) {
              return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                    "Camera \"%s\" does not have a flash unit", id.string());
+                    "Camera \"%s\" does not have a flash unit", cameraId.c_str());
             }
             ALOGE("%s: getting current torch status failed for camera %s",
-                    __FUNCTION__, id.string());
+                    __FUNCTION__, cameraId.c_str());
             return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
                     "Error changing torch strength level for camera \"%s\": %s (%d)",
-                    id.string(), strerror(-err), err);
+                    cameraId.c_str(), strerror(-err), err);
         }
 
         if (status == TorchModeStatus::NOT_AVAILABLE) {
             if (cameraStatus == StatusInternal::NOT_AVAILABLE) {
                 ALOGE("%s: torch mode of camera %s is not available because "
-                        "camera is in use.", __FUNCTION__, id.string());
+                        "camera is in use.", __FUNCTION__, cameraId.c_str());
                 return STATUS_ERROR_FMT(ERROR_CAMERA_IN_USE,
                         "Torch for camera \"%s\" is not available due to an existing camera user",
-                        id.string());
+                        cameraId.c_str());
             } else {
                 ALOGE("%s: torch mode of camera %s is not available due to "
-                       "insufficient resources", __FUNCTION__, id.string());
+                       "insufficient resources", __FUNCTION__, cameraId.c_str());
                 return STATUS_ERROR_FMT(ERROR_MAX_CAMERAS_IN_USE,
                         "Torch for camera \"%s\" is not available due to insufficient resources",
-                        id.string());
+                        cameraId.c_str());
             }
         }
     }
@@ -2353,44 +2330,44 @@
     }
     // Check if the current torch strength level is same as the new one.
     bool shouldSkipTorchStrengthUpdates = mCameraProviderManager->shouldSkipTorchStrengthUpdate(
-            id.string(), torchStrength);
+            cameraId, torchStrength);
 
-    status_t err = mFlashlight->turnOnTorchWithStrengthLevel(id, torchStrength);
+    status_t err = mFlashlight->turnOnTorchWithStrengthLevel(cameraId, torchStrength);
 
     if (err != OK) {
         int32_t errorCode;
-        String8 msg;
+        std::string msg;
         switch (err) {
             case -ENOSYS:
-                msg = String8::format("Camera \"%s\" has no flashlight.",
-                    id.string());
+                msg = fmt::sprintf("Camera \"%s\" has no flashlight.",
+                    cameraId.c_str());
                 errorCode = ERROR_ILLEGAL_ARGUMENT;
                 break;
             case -EBUSY:
-                msg = String8::format("Camera \"%s\" is in use",
-                    id.string());
+                msg = fmt::sprintf("Camera \"%s\" is in use",
+                    cameraId.c_str());
                 errorCode = ERROR_CAMERA_IN_USE;
                 break;
             case -EINVAL:
-                msg = String8::format("Torch strength level %d is not within the "
+                msg = fmt::sprintf("Torch strength level %d is not within the "
                         "valid range.", torchStrength);
                 errorCode = ERROR_ILLEGAL_ARGUMENT;
                 break;
             default:
-                msg = String8::format("Changing torch strength level failed.");
+                msg = "Changing torch strength level failed.";
                 errorCode = ERROR_INVALID_OPERATION;
         }
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(errorCode, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(errorCode, msg.c_str());
     }
 
     {
         // update the link to client's death
         // Store the last client that turns on each camera's torch mode.
         Mutex::Autolock al(mTorchClientMapMutex);
-        ssize_t index = mTorchClientMap.indexOfKey(id);
+        ssize_t index = mTorchClientMap.indexOfKey(cameraId);
         if (index == NAME_NOT_FOUND) {
-            mTorchClientMap.add(id, clientBinder);
+            mTorchClientMap.add(cameraId, clientBinder);
         } else {
             mTorchClientMap.valueAt(index)->unlinkToDeath(this);
             mTorchClientMap.replaceValueAt(index, clientBinder);
@@ -2399,16 +2376,15 @@
     }
 
     int clientPid = CameraThreadState::getCallingPid();
-    const char *id_cstr = id.c_str();
     ALOGI("%s: Torch strength for camera id %s changed to %d for client PID %d",
-            __FUNCTION__, id_cstr, torchStrength, clientPid);
+            __FUNCTION__, cameraId.c_str(), torchStrength, clientPid);
     if (!shouldSkipTorchStrengthUpdates) {
-        broadcastTorchStrengthLevel(id, torchStrength);
+        broadcastTorchStrengthLevel(cameraId, torchStrength);
     }
     return Status::ok();
 }
 
-Status CameraService::setTorchMode(const String16& cameraId, bool enabled,
+Status CameraService::setTorchMode(const std::string& cameraId, bool enabled,
         const sp<IBinder>& clientBinder) {
     Mutex::Autolock lock(mServiceLock);
 
@@ -2419,58 +2395,58 @@
                 "Torch client Binder is null");
     }
 
-    String8 id = String8(cameraId.string());
     int uid = CameraThreadState::getCallingUid();
 
-    if (shouldRejectSystemCameraConnection(id)) {
+    if (shouldRejectSystemCameraConnection(cameraId)) {
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT, "Unable to set torch mode"
-                " for system only device %s: ", id.string());
+                " for system only device %s: ", cameraId.c_str());
     }
     // verify id is valid.
-    auto state = getCameraState(id);
+    auto state = getCameraState(cameraId);
     if (state == nullptr) {
-        ALOGE("%s: camera id is invalid %s", __FUNCTION__, id.string());
+        ALOGE("%s: camera id is invalid %s", __FUNCTION__, cameraId.c_str());
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                "Camera ID \"%s\" is a not valid camera ID", id.string());
+                "Camera ID \"%s\" is a not valid camera ID", cameraId.c_str());
     }
 
     StatusInternal cameraStatus = state->getStatus();
     if (cameraStatus != StatusInternal::PRESENT &&
             cameraStatus != StatusInternal::NOT_AVAILABLE) {
-        ALOGE("%s: camera id is invalid %s, status %d", __FUNCTION__, id.string(), (int)cameraStatus);
+        ALOGE("%s: camera id is invalid %s, status %d", __FUNCTION__, cameraId.c_str(),
+                (int)cameraStatus);
         return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                "Camera ID \"%s\" is a not valid camera ID", id.string());
+                "Camera ID \"%s\" is a not valid camera ID", cameraId.c_str());
     }
 
     {
         Mutex::Autolock al(mTorchStatusMutex);
         TorchModeStatus status;
-        status_t err = getTorchStatusLocked(id, &status);
+        status_t err = getTorchStatusLocked(cameraId, &status);
         if (err != OK) {
             if (err == NAME_NOT_FOUND) {
                 return STATUS_ERROR_FMT(ERROR_ILLEGAL_ARGUMENT,
-                        "Camera \"%s\" does not have a flash unit", id.string());
+                        "Camera \"%s\" does not have a flash unit", cameraId.c_str());
             }
             ALOGE("%s: getting current torch status failed for camera %s",
-                    __FUNCTION__, id.string());
+                    __FUNCTION__, cameraId.c_str());
             return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION,
-                    "Error updating torch status for camera \"%s\": %s (%d)", id.string(),
+                    "Error updating torch status for camera \"%s\": %s (%d)", cameraId.c_str(),
                     strerror(-err), err);
         }
 
         if (status == TorchModeStatus::NOT_AVAILABLE) {
             if (cameraStatus == StatusInternal::NOT_AVAILABLE) {
                 ALOGE("%s: torch mode of camera %s is not available because "
-                        "camera is in use", __FUNCTION__, id.string());
+                        "camera is in use", __FUNCTION__, cameraId.c_str());
                 return STATUS_ERROR_FMT(ERROR_CAMERA_IN_USE,
                         "Torch for camera \"%s\" is not available due to an existing camera user",
-                        id.string());
+                        cameraId.c_str());
             } else {
                 ALOGE("%s: torch mode of camera %s is not available due to "
-                        "insufficient resources", __FUNCTION__, id.string());
+                        "insufficient resources", __FUNCTION__, cameraId.c_str());
                 return STATUS_ERROR_FMT(ERROR_MAX_CAMERAS_IN_USE,
                         "Torch for camera \"%s\" is not available due to insufficient resources",
-                        id.string());
+                        cameraId.c_str());
             }
         }
     }
@@ -2482,40 +2458,40 @@
         updateTorchUidMapLocked(cameraId, uid);
     }
 
-    status_t err = mFlashlight->setTorchMode(id, enabled);
+    status_t err = mFlashlight->setTorchMode(cameraId, enabled);
 
     if (err != OK) {
         int32_t errorCode;
-        String8 msg;
+        std::string msg;
         switch (err) {
             case -ENOSYS:
-                msg = String8::format("Camera \"%s\" has no flashlight",
-                    id.string());
+                msg = fmt::sprintf("Camera \"%s\" has no flashlight",
+                    cameraId.c_str());
                 errorCode = ERROR_ILLEGAL_ARGUMENT;
                 break;
             case -EBUSY:
-                msg = String8::format("Camera \"%s\" is in use",
-                    id.string());
+                msg = fmt::sprintf("Camera \"%s\" is in use",
+                    cameraId.c_str());
                 errorCode = ERROR_CAMERA_IN_USE;
                 break;
             default:
-                msg = String8::format(
+                msg = fmt::sprintf(
                     "Setting torch mode of camera \"%s\" to %d failed: %s (%d)",
-                    id.string(), enabled, strerror(-err), err);
+                    cameraId.c_str(), enabled, strerror(-err), err);
                 errorCode = ERROR_INVALID_OPERATION;
         }
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        logServiceError(msg,errorCode);
-        return STATUS_ERROR(errorCode, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        logServiceError(msg, errorCode);
+        return STATUS_ERROR(errorCode, msg.c_str());
     }
 
     {
         // update the link to client's death
         Mutex::Autolock al(mTorchClientMapMutex);
-        ssize_t index = mTorchClientMap.indexOfKey(id);
+        ssize_t index = mTorchClientMap.indexOfKey(cameraId);
         if (enabled) {
             if (index == NAME_NOT_FOUND) {
-                mTorchClientMap.add(id, clientBinder);
+                mTorchClientMap.add(cameraId, clientBinder);
             } else {
                 mTorchClientMap.valueAt(index)->unlinkToDeath(this);
                 mTorchClientMap.replaceValueAt(index, clientBinder);
@@ -2527,21 +2503,20 @@
     }
 
     int clientPid = CameraThreadState::getCallingPid();
-    const char *id_cstr = id.c_str();
-    const char *torchState = enabled ? "on" : "off";
-    ALOGI("Torch for camera id %s turned %s for client PID %d", id_cstr, torchState, clientPid);
-    logTorchEvent(id_cstr, torchState , clientPid);
+    std::string torchState = enabled ? "on" : "off";
+    ALOGI("Torch for camera id %s turned %s for client PID %d", cameraId.c_str(),
+            torchState.c_str(), clientPid);
+    logTorchEvent(cameraId, torchState, clientPid);
     return Status::ok();
 }
 
-void CameraService::updateTorchUidMapLocked(const String16& cameraId, int uid) {
-    String8 id = String8(cameraId.string());
-    if (mTorchUidMap.find(id) == mTorchUidMap.end()) {
-        mTorchUidMap[id].first = uid;
-        mTorchUidMap[id].second = uid;
+void CameraService::updateTorchUidMapLocked(const std::string& cameraId, int uid) {
+    if (mTorchUidMap.find(cameraId) == mTorchUidMap.end()) {
+        mTorchUidMap[cameraId].first = uid;
+        mTorchUidMap[cameraId].second = uid;
     } else {
         // Set the pending UID
-        mTorchUidMap[id].first = uid;
+        mTorchUidMap[cameraId].first = uid;
     }
 }
 
@@ -2554,7 +2529,7 @@
     if (pid != selfPid) {
         // Ensure we're being called by system_server, or similar process with
         // permissions to notify the camera service about system events
-        if (!checkCallingPermission(sCameraSendSystemEventsPermission)) {
+        if (!checkCallingPermission(toString16(sCameraSendSystemEventsPermission))) {
             const int uid = CameraThreadState::getCallingUid();
             ALOGE("Permission Denial: cannot send updates to camera service about system"
                     " events from pid=%d, uid=%d", pid, uid);
@@ -2628,7 +2603,7 @@
     if (pid != selfPid) {
         // Ensure we're being called by system_server, or similar process with
         // permissions to notify the camera service about system events
-        if (!checkCallingPermission(sCameraSendSystemEventsPermission)) {
+        if (!checkCallingPermission(toString16(sCameraSendSystemEventsPermission))) {
             const int uid = CameraThreadState::getCallingUid();
             ALOGE("Permission Denial: cannot send updates to camera service about device"
                     " state changes from pid=%d, uid=%d", pid, uid);
@@ -2659,7 +2634,7 @@
     if (callingPid != selfPid) {
         // Ensure we're being called by system_server, or similar process with
         // permissions to notify the camera service about system events
-        if (!checkCallingPermission(sCameraSendSystemEventsPermission)) {
+        if (!checkCallingPermission(toString16(sCameraSendSystemEventsPermission))) {
             const int uid = CameraThreadState::getCallingUid();
             ALOGE("Permission Denial: cannot send updates to camera service about orientation"
                     " changes from pid=%d, uid=%d", callingPid, uid);
@@ -2701,7 +2676,7 @@
 
     if (!mInitialized) {
         ALOGE("%s: Camera HAL couldn't be initialized", __FUNCTION__);
-        logServiceError(String8::format("Camera subsystem is not available"),ERROR_DISCONNECTED);
+        logServiceError("Camera subsystem is not available", ERROR_DISCONNECTED);
         return STATUS_ERROR(ERROR_DISCONNECTED,
                 "Camera subsystem is not available");
     }
@@ -2713,8 +2688,7 @@
         std::vector<std::string> validCombination;
         for (auto &cameraId : combination) {
             // if the camera state is not present, skip
-            String8 cameraIdStr(cameraId.c_str());
-            auto state = getCameraState(cameraIdStr);
+            auto state = getCameraState(cameraId);
             if (state == nullptr) {
                 ALOGW("%s: camera id %s does not exist", __FUNCTION__, cameraId.c_str());
                 continue;
@@ -2723,7 +2697,7 @@
             if (status == StatusInternal::NOT_PRESENT || status == StatusInternal::ENUMERATING) {
                 continue;
             }
-            if (shouldRejectSystemCameraConnection(cameraIdStr)) {
+            if (shouldRejectSystemCameraConnection(cameraId)) {
                 continue;
             }
             validCombination.push_back(cameraId);
@@ -2757,8 +2731,8 @@
     attributionSource.pid = callingPid;
     attributionSource.uid = callingUid;
     bool checkPermissionForCamera = permissionChecker.checkPermissionForPreflight(
-                sCameraPermission, attributionSource, String16(), AppOpsManager::OP_NONE)
-                != permission::PermissionChecker::PERMISSION_HARD_DENIED;
+                toString16(sCameraPermission), attributionSource, String16(),
+                AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
     if ((callingPid != getpid()) && !checkPermissionForCamera) {
         ALOGE("%s: pid %d doesn't have camera permissions", __FUNCTION__, callingPid);
         return STATUS_ERROR(ERROR_PERMISSION_DENIED,
@@ -2771,7 +2745,7 @@
                     cameraIdsAndSessionConfigurations, mPerfClassPrimaryCameraIds,
                     targetSdkVersion, isSupported);
     if (res != OK) {
-        logServiceError(String8::format("Unable to query session configuration support"),
+        logServiceError("Unable to query session configuration support",
             ERROR_INVALID_OPERATION);
         return STATUS_ERROR_FMT(ERROR_INVALID_OPERATION, "Unable to query session configuration "
                 "support %s (%d)", strerror(-res), res);
@@ -2811,7 +2785,7 @@
     attributionSource.uid = clientUid;
     attributionSource.pid = clientPid;
     bool openCloseCallbackAllowed = permissionChecker.checkPermissionForPreflight(
-            sCameraOpenCloseListenerPermission, attributionSource, String16(),
+            toString16(sCameraOpenCloseListenerPermission), attributionSource, String16(),
             AppOpsManager::OP_NONE) != permission::PermissionChecker::PERMISSION_HARD_DENIED;
 
     Mutex::Autolock lock(mServiceLock);
@@ -2831,11 +2805,11 @@
                         openCloseCallbackAllowed);
         auto ret = serviceListener->initialize(isProcessLocalTest);
         if (ret != NO_ERROR) {
-            String8 msg = String8::format("Failed to initialize service listener: %s (%d)",
+            std::string msg = fmt::sprintf("Failed to initialize service listener: %s (%d)",
                     strerror(-ret), ret);
-            logServiceError(msg,ERROR_ILLEGAL_ARGUMENT);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.string());
+            logServiceError(msg, ERROR_ILLEGAL_ARGUMENT);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
         // The listener still needs to be added to the list of listeners, regardless of what
         // permissions the listener process has / whether it is a vendor listener. Since it might be
@@ -2850,7 +2824,7 @@
         for (auto& i : mCameraStates) {
             cameraStatuses->emplace_back(i.first,
                     mapToInterface(i.second->getStatus()), i.second->getUnavailablePhysicalIds(),
-                    openCloseCallbackAllowed ? i.second->getClientPackage() : String8::empty());
+                    openCloseCallbackAllowed ? i.second->getClientPackage() : std::string());
         }
     }
     // Remove the camera statuses that should be hidden from the client, we do
@@ -2869,9 +2843,9 @@
                             clientUid);}), cameraStatuses->end());
 
     //cameraStatuses will have non-eligible camera ids removed.
-    std::set<String16> idsChosenForCallback;
+    std::set<std::string> idsChosenForCallback;
     for (const auto &s : *cameraStatuses) {
-        idsChosenForCallback.insert(String16(s.cameraId));
+        idsChosenForCallback.insert(s.cameraId);
     }
 
     /*
@@ -2881,7 +2855,7 @@
     {
         Mutex::Autolock al(mTorchStatusMutex);
         for (size_t i = 0; i < mTorchStatusMap.size(); i++ ) {
-            String16 id = String16(mTorchStatusMap.keyAt(i).string());
+            const std::string &id = mTorchStatusMap.keyAt(i);
             // The camera id is visible to the client. Fine to send torch
             // callback.
             if (idsChosenForCallback.find(id) != idsChosenForCallback.end()) {
@@ -2923,7 +2897,7 @@
     return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, "Unregistered listener given to removeListener");
 }
 
-Status CameraService::getLegacyParameters(int cameraId, /*out*/String16* parameters) {
+Status CameraService::getLegacyParameters(int cameraId, /*out*/std::string* parameters) {
 
     ATRACE_CALL();
     ALOGV("%s: for camera ID = %d", __FUNCTION__, cameraId);
@@ -2942,37 +2916,34 @@
     }
 
     String8 shimParamsString8 = shimParams.flatten();
-    String16 shimParamsString16 = String16(shimParamsString8);
 
-    *parameters = shimParamsString16;
+    *parameters = toStdString(shimParamsString8);
 
     return ret;
 }
 
-Status CameraService::supportsCameraApi(const String16& cameraId, int apiVersion,
+Status CameraService::supportsCameraApi(const std::string& cameraId, int apiVersion,
         /*out*/ bool *isSupported) {
     ATRACE_CALL();
 
-    const String8 id = String8(cameraId);
-
-    ALOGV("%s: for camera ID = %s", __FUNCTION__, id.string());
+    ALOGV("%s: for camera ID = %s", __FUNCTION__, cameraId.c_str());
 
     switch (apiVersion) {
         case API_VERSION_1:
         case API_VERSION_2:
             break;
         default:
-            String8 msg = String8::format("Unknown API version %d", apiVersion);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.string());
+            std::string msg = fmt::sprintf("Unknown API version %d", apiVersion);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     int portraitRotation;
-    auto deviceVersionAndTransport = getDeviceVersion(id, false, &portraitRotation);
+    auto deviceVersionAndTransport = getDeviceVersion(cameraId, false, &portraitRotation);
     if (deviceVersionAndTransport.first == -1) {
-        String8 msg = String8::format("Unknown camera ID %s", id.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Unknown camera ID %s", cameraId.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (deviceVersionAndTransport.second == IPCTransport::HIDL) {
         int deviceVersion = deviceVersionAndTransport.first;
@@ -2982,11 +2953,11 @@
             case CAMERA_DEVICE_API_VERSION_3_1:
                 if (apiVersion == API_VERSION_2) {
                     ALOGV("%s: Camera id %s uses HAL version %d <3.2, doesn't support api2 without "
-                            "shim", __FUNCTION__, id.string(), deviceVersion);
+                            "shim", __FUNCTION__, cameraId.c_str(), deviceVersion);
                     *isSupported = false;
                 } else { // if (apiVersion == API_VERSION_1) {
                     ALOGV("%s: Camera id %s uses older HAL before 3.2, but api1 is always "
-                            "supported", __FUNCTION__, id.string());
+                            "supported", __FUNCTION__, cameraId.c_str());
                     *isSupported = true;
                 }
                 break;
@@ -2997,14 +2968,14 @@
             case CAMERA_DEVICE_API_VERSION_3_6:
             case CAMERA_DEVICE_API_VERSION_3_7:
                 ALOGV("%s: Camera id %s uses HAL3.2 or newer, supports api1/api2 directly",
-                        __FUNCTION__, id.string());
+                        __FUNCTION__, cameraId.c_str());
                 *isSupported = true;
                 break;
             default: {
-                String8 msg = String8::format("Unknown device version %x for device %s",
-                        deviceVersion, id.string());
-                ALOGE("%s: %s", __FUNCTION__, msg.string());
-                return STATUS_ERROR(ERROR_INVALID_OPERATION, msg.string());
+                std::string msg = fmt::sprintf("Unknown device version %x for device %s",
+                        deviceVersion, cameraId.c_str());
+                ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+                return STATUS_ERROR(ERROR_INVALID_OPERATION, msg.c_str());
             }
         }
     } else {
@@ -3013,27 +2984,25 @@
     return Status::ok();
 }
 
-Status CameraService::isHiddenPhysicalCamera(const String16& cameraId,
+Status CameraService::isHiddenPhysicalCamera(const std::string& cameraId,
         /*out*/ bool *isSupported) {
     ATRACE_CALL();
 
-    const String8 id = String8(cameraId);
-
-    ALOGV("%s: for camera ID = %s", __FUNCTION__, id.string());
-    *isSupported = mCameraProviderManager->isHiddenPhysicalCamera(id.string());
+    ALOGV("%s: for camera ID = %s", __FUNCTION__, cameraId.c_str());
+    *isSupported = mCameraProviderManager->isHiddenPhysicalCamera(cameraId);
 
     return Status::ok();
 }
 
 Status CameraService::injectCamera(
-        const String16& packageName, const String16& internalCamId,
-        const String16& externalCamId,
+        const std::string& packageName, const std::string& internalCamId,
+        const std::string& externalCamId,
         const sp<ICameraInjectionCallback>& callback,
         /*out*/
         sp<ICameraInjectionSession>* cameraInjectionSession) {
     ATRACE_CALL();
 
-    if (!checkCallingPermission(sCameraInjectExternalCameraPermission)) {
+    if (!checkCallingPermission(toString16(sCameraInjectExternalCameraPermission))) {
         const int pid = CameraThreadState::getCallingPid();
         const int uid = CameraThreadState::getCallingUid();
         ALOGE("Permission Denial: can't inject camera pid=%d, uid=%d", pid, uid);
@@ -3044,13 +3013,13 @@
     ALOGV(
         "%s: Package name = %s, Internal camera ID = %s, External camera ID = "
         "%s",
-        __FUNCTION__, String8(packageName).string(),
-        String8(internalCamId).string(), String8(externalCamId).string());
+        __FUNCTION__, packageName.c_str(),
+        internalCamId.c_str(), externalCamId.c_str());
 
     {
         Mutex::Autolock lock(mInjectionParametersLock);
-        mInjectionInternalCamId = String8(internalCamId);
-        mInjectionExternalCamId = String8(externalCamId);
+        mInjectionInternalCamId = internalCamId;
+        mInjectionExternalCamId = externalCamId;
         mInjectionStatusListener->addListener(callback);
         *cameraInjectionSession = new CameraInjectionSession(this);
         status_t res = NO_ERROR;
@@ -3065,7 +3034,7 @@
             if(res != OK) {
                 return STATUS_ERROR_FMT(ERROR_DISCONNECTED,
                         "No camera device with ID \"%s\" currently available",
-                        mInjectionExternalCamId.string());
+                        mInjectionExternalCamId.c_str());
             }
             res = clientSp->injectCamera(mInjectionExternalCamId, mCameraProviderManager);
             if(res != OK) {
@@ -3080,7 +3049,7 @@
 }
 
 Status CameraService::reportExtensionSessionStats(
-        const hardware::CameraExtensionSessionStats& stats, String16* sessionKey /*out*/) {
+        const hardware::CameraExtensionSessionStats& stats, std::string* sessionKey /*out*/) {
     ALOGV("%s: reported %s", __FUNCTION__, stats.toString().c_str());
     *sessionKey = mCameraServiceProxyWrapper->updateExtensionStats(stats);
     return Status::ok();
@@ -3147,7 +3116,7 @@
 }
 
 std::shared_ptr<CameraService::CameraState> CameraService::getCameraState(
-        const String8& cameraId) const {
+        const std::string& cameraId) const {
     std::shared_ptr<CameraState> state;
     {
         Mutex::Autolock lock(mCameraStatesLock);
@@ -3159,12 +3128,12 @@
     return state;
 }
 
-sp<CameraService::BasicClient> CameraService::removeClientLocked(const String8& cameraId) {
+sp<CameraService::BasicClient> CameraService::removeClientLocked(const std::string& cameraId) {
     // Remove from active clients list
     auto clientDescriptorPtr = mActiveClientManager.remove(cameraId);
     if (clientDescriptorPtr == nullptr) {
         ALOGW("%s: Could not evict client, no client for camera ID %s", __FUNCTION__,
-                cameraId.string());
+                cameraId.c_str());
         return sp<BasicClient>{nullptr};
     }
 
@@ -3219,16 +3188,14 @@
 
         evicted.push_back(clientSp);
 
-        String8 curTime = getFormattedCurrentTime();
-
         ALOGE("Evicting conflicting client for camera ID %s due to user change",
-                i->getKey().string());
+                i->getKey().c_str());
 
         // Log the clients evicted
-        logEvent(String8::format("EVICT device %s client held by package %s (PID %"
+        logEvent(fmt::sprintf("EVICT device %s client held by package %s (PID %"
                 PRId32 ", score %" PRId32 ", state %" PRId32 ")\n   - Evicted due"
-                " to user switch.", i->getKey().string(),
-                String8{clientSp->getPackageName()}.string(),
+                " to user switch.", i->getKey().c_str(),
+                clientSp->getPackageName().c_str(),
                 i->getOwnerId(), i->getPriority().getScore(),
                 i->getPriority().getState()));
 
@@ -3251,12 +3218,12 @@
     mServiceLock.lock();
 }
 
-void CameraService::logEvent(const char* event) {
-    String8 curTime = getFormattedCurrentTime();
+void CameraService::logEvent(const std::string &event) {
+    std::string curTime = getFormattedCurrentTime();
     Mutex::Autolock l(mLogLock);
-    String8 msg = String8::format("%s : %s", curTime.string(), event);
+    std::string msg = curTime + " : " + event;
     // For service error events, print the msg only once.
-    if(!msg.contains("SERVICE ERROR")) {
+    if (msg.find("SERVICE ERROR") != std::string::npos) {
         mEventLog.add(msg);
     } else if(sServiceErrorEventSet.find(msg) == sServiceErrorEventSet.end()) {
         // Error event not added to the dumpsys log before
@@ -3265,77 +3232,78 @@
     }
 }
 
-void CameraService::logDisconnected(const char* cameraId, int clientPid,
-        const char* clientPackage) {
+void CameraService::logDisconnected(const std::string &cameraId, int clientPid,
+        const std::string &clientPackage) {
     // Log the clients evicted
-    logEvent(String8::format("DISCONNECT device %s client for package %s (PID %d)", cameraId,
-            clientPackage, clientPid));
+    logEvent(fmt::sprintf("DISCONNECT device %s client for package %s (PID %d)", cameraId.c_str(),
+            clientPackage.c_str(), clientPid));
 }
 
-void CameraService::logDisconnectedOffline(const char* cameraId, int clientPid,
-        const char* clientPackage) {
+void CameraService::logDisconnectedOffline(const std::string &cameraId, int clientPid,
+        const std::string &clientPackage) {
     // Log the clients evicted
-    logEvent(String8::format("DISCONNECT offline device %s client for package %s (PID %d)",
-                cameraId, clientPackage, clientPid));
+    logEvent(fmt::sprintf("DISCONNECT offline device %s client for package %s (PID %d)",
+            cameraId.c_str(), clientPackage.c_str(), clientPid));
 }
 
-void CameraService::logConnected(const char* cameraId, int clientPid,
-        const char* clientPackage) {
+void CameraService::logConnected(const std::string &cameraId, int clientPid,
+        const std::string &clientPackage) {
     // Log the clients evicted
-    logEvent(String8::format("CONNECT device %s client for package %s (PID %d)", cameraId,
-            clientPackage, clientPid));
+    logEvent(fmt::sprintf("CONNECT device %s client for package %s (PID %d)", cameraId.c_str(),
+            clientPackage.c_str(), clientPid));
 }
 
-void CameraService::logConnectedOffline(const char* cameraId, int clientPid,
-        const char* clientPackage) {
+void CameraService::logConnectedOffline(const std::string &cameraId, int clientPid,
+        const std::string &clientPackage) {
     // Log the clients evicted
-    logEvent(String8::format("CONNECT offline device %s client for package %s (PID %d)", cameraId,
-            clientPackage, clientPid));
+    logEvent(fmt::sprintf("CONNECT offline device %s client for package %s (PID %d)",
+            cameraId.c_str(), clientPackage.c_str(), clientPid));
 }
 
-void CameraService::logRejected(const char* cameraId, int clientPid,
-        const char* clientPackage, const char* reason) {
+void CameraService::logRejected(const std::string &cameraId, int clientPid,
+        const std::string &clientPackage, const std::string &reason) {
     // Log the client rejected
-    logEvent(String8::format("REJECT device %s client for package %s (PID %d), reason: (%s)",
-            cameraId, clientPackage, clientPid, reason));
+    logEvent(fmt::sprintf("REJECT device %s client for package %s (PID %d), reason: (%s)",
+            cameraId.c_str(), clientPackage.c_str(), clientPid, reason.c_str()));
 }
 
-void CameraService::logTorchEvent(const char* cameraId, const char *torchState, int clientPid) {
+void CameraService::logTorchEvent(const std::string &cameraId, const std::string &torchState,
+        int clientPid) {
     // Log torch event
-    logEvent(String8::format("Torch for camera id %s turned %s for client PID %d", cameraId,
-            torchState, clientPid));
+    logEvent(fmt::sprintf("Torch for camera id %s turned %s for client PID %d", cameraId.c_str(),
+            torchState.c_str(), clientPid));
 }
 
 void CameraService::logUserSwitch(const std::set<userid_t>& oldUserIds,
         const std::set<userid_t>& newUserIds) {
-    String8 newUsers = toString(newUserIds);
-    String8 oldUsers = toString(oldUserIds);
+    std::string newUsers = toString(newUserIds);
+    std::string oldUsers = toString(oldUserIds);
     if (oldUsers.size() == 0) {
         oldUsers = "<None>";
     }
     // Log the new and old users
-    logEvent(String8::format("USER_SWITCH previous allowed user IDs: %s, current allowed user IDs: %s",
-            oldUsers.string(), newUsers.string()));
+    logEvent(fmt::sprintf("USER_SWITCH previous allowed user IDs: %s, current allowed user IDs: %s",
+            oldUsers.c_str(), newUsers.c_str()));
 }
 
-void CameraService::logDeviceRemoved(const char* cameraId, const char* reason) {
+void CameraService::logDeviceRemoved(const std::string &cameraId, const std::string &reason) {
     // Log the device removal
-    logEvent(String8::format("REMOVE device %s, reason: (%s)", cameraId, reason));
+    logEvent(fmt::sprintf("REMOVE device %s, reason: (%s)", cameraId.c_str(), reason.c_str()));
 }
 
-void CameraService::logDeviceAdded(const char* cameraId, const char* reason) {
+void CameraService::logDeviceAdded(const std::string &cameraId, const std::string &reason) {
     // Log the device removal
-    logEvent(String8::format("ADD device %s, reason: (%s)", cameraId, reason));
+    logEvent(fmt::sprintf("ADD device %s, reason: (%s)", cameraId.c_str(), reason.c_str()));
 }
 
-void CameraService::logClientDied(int clientPid, const char* reason) {
+void CameraService::logClientDied(int clientPid, const std::string &reason) {
     // Log the device removal
-    logEvent(String8::format("DIED client(s) with PID %d, reason: (%s)", clientPid, reason));
+    logEvent(fmt::sprintf("DIED client(s) with PID %d, reason: (%s)", clientPid, reason.c_str()));
 }
 
-void CameraService::logServiceError(const char* msg, int errorCode) {
-    String8 curTime = getFormattedCurrentTime();
-    logEvent(String8::format("SERVICE ERROR: %s : %d (%s)", msg, errorCode, strerror(-errorCode)));
+void CameraService::logServiceError(const std::string &msg, int errorCode) {
+    logEvent(fmt::sprintf("SERVICE ERROR: %s : %d (%s)", msg.c_str(), errorCode,
+            strerror(-errorCode)));
 }
 
 status_t CameraService::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
@@ -3455,9 +3423,9 @@
 
 CameraService::Client::Client(const sp<CameraService>& cameraService,
         const sp<ICameraClient>& cameraClient,
-        const String16& clientPackageName, bool systemNativeClient,
-        const std::optional<String16>& clientFeatureId,
-        const String8& cameraIdStr,
+        const std::string& clientPackageName, bool systemNativeClient,
+        const std::optional<std::string>& clientFeatureId,
+        const std::string& cameraIdStr,
         int api1CameraId, int cameraFacing, int sensorOrientation,
         int clientPid, uid_t clientUid,
         int servicePid, bool overrideToPortrait) :
@@ -3493,8 +3461,8 @@
 
 CameraService::BasicClient::BasicClient(const sp<CameraService>& cameraService,
         const sp<IBinder>& remoteCallback,
-        const String16& clientPackageName, bool nativeClient,
-        const std::optional<String16>& clientFeatureId, const String8& cameraIdStr,
+        const std::string& clientPackageName, bool nativeClient,
+        const std::optional<std::string>& clientFeatureId, const std::string& cameraIdStr,
         int cameraFacing, int sensorOrientation, int clientPid, uid_t clientUid,
         int servicePid, bool overrideToPortrait):
         mDestructionStarted(false),
@@ -3545,9 +3513,9 @@
     mDisconnected = true;
 
     sCameraService->removeByClient(this);
-    sCameraService->logDisconnected(mCameraIdStr, mClientPid, String8(mClientPackageName));
+    sCameraService->logDisconnected(mCameraIdStr, mClientPid, mClientPackageName);
     sCameraService->mCameraProviderManager->removeRef(CameraProviderManager::DeviceMode::CAMERA,
-            mCameraIdStr.c_str());
+            mCameraIdStr);
 
     sp<IBinder> remote = getRemote();
     if (remote != nullptr) {
@@ -3557,7 +3525,7 @@
     finishCameraOps();
     // Notify flashlight that a camera device is closed.
     sCameraService->mFlashlight->deviceClosed(mCameraIdStr);
-    ALOGI("%s: Disconnected client for camera %s for PID %d", __FUNCTION__, mCameraIdStr.string(),
+    ALOGI("%s: Disconnected client for camera %s for PID %d", __FUNCTION__, mCameraIdStr.c_str(),
             mClientPid);
 
     // client shouldn't be able to call into us anymore
@@ -3581,7 +3549,7 @@
     return OK;
 }
 
-status_t CameraService::BasicClient::startWatchingTags(const String8&, int) {
+status_t CameraService::BasicClient::startWatchingTags(const std::string&, int) {
     // Can't watch tags directly, must go through CameraService::startWatchingTags
     return OK;
 }
@@ -3596,7 +3564,7 @@
     return OK;
 }
 
-String16 CameraService::BasicClient::getPackageName() const {
+std::string CameraService::BasicClient::getPackageName() const {
     return mClientPackageName;
 }
 
@@ -3653,7 +3621,7 @@
 status_t CameraService::BasicClient::handleAppOpMode(int32_t mode) {
     if (mode == AppOpsManager::MODE_ERRORED) {
         ALOGI("Camera %s: Access for \"%s\" has been revoked",
-                mCameraIdStr.string(), String8(mClientPackageName).string());
+                mCameraIdStr.c_str(), mClientPackageName.c_str());
         return PERMISSION_DENIED;
     } else if (!mUidIsTrusted && mode == AppOpsManager::MODE_IGNORED) {
         // If the calling Uid is trusted (a native service), the AppOpsManager could
@@ -3669,7 +3637,7 @@
         // capabilities are unknown.
         if (!isUidActive || !isCameraPrivacyEnabled) {
             ALOGI("Camera %s: Access for \"%s\" has been restricted",
-                    mCameraIdStr.string(), String8(mClientPackageName).string());
+                    mCameraIdStr.c_str(), mClientPackageName.c_str());
             // Return the same error as for device policy manager rejection
             return -EACCES;
         }
@@ -3682,18 +3650,18 @@
 
     {
         ALOGV("%s: Start camera ops, package name = %s, client UID = %d",
-              __FUNCTION__, String8(mClientPackageName).string(), mClientUid);
+              __FUNCTION__, mClientPackageName.c_str(), mClientUid);
     }
     if (mAppOpsManager != nullptr) {
         // Notify app ops that the camera is not available
         mOpsCallback = new OpsCallback(this);
         mAppOpsManager->startWatchingMode(AppOpsManager::OP_CAMERA,
-                mClientPackageName, mOpsCallback);
+                toString16(mClientPackageName), mOpsCallback);
 
         // Just check for camera acccess here on open - delay startOp until
         // camera frames start streaming in startCameraStreamingOps
         int32_t mode = mAppOpsManager->checkOp(AppOpsManager::OP_CAMERA, mClientUid,
-                mClientPackageName);
+                toString16(mClientPackageName));
         status_t res = handleAppOpMode(mode);
         if (res != OK) {
             return res;
@@ -3726,12 +3694,13 @@
     }
 
     ALOGV("%s: Start camera streaming ops, package name = %s, client UID = %d",
-            __FUNCTION__, String8(mClientPackageName).string(), mClientUid);
+            __FUNCTION__, mClientPackageName.c_str(), mClientUid);
 
     if (mAppOpsManager != nullptr) {
         int32_t mode = mAppOpsManager->startOpNoThrow(AppOpsManager::OP_CAMERA, mClientUid,
-                mClientPackageName, /*startIfModeDefault*/ false, mClientFeatureId,
-                String16("start camera ") + String16(mCameraIdStr));
+                toString16(mClientPackageName), /*startIfModeDefault*/ false,
+                toString16(mClientFeatureId),
+                toString16("start camera ") + toString16(mCameraIdStr));
         status_t res = handleAppOpMode(mode);
         if (res != OK) {
             return res;
@@ -3747,14 +3716,14 @@
     ATRACE_CALL();
 
     ALOGV("%s: Start camera noteAppOp, package name = %s, client UID = %d",
-            __FUNCTION__, String8(mClientPackageName).string(), mClientUid);
+            __FUNCTION__, mClientPackageName.c_str(), mClientUid);
 
     // noteAppOp is only used for when camera mute is not supported, in order
     // to trigger the sensor privacy "Unblock" dialog
     if (mAppOpsManager != nullptr) {
         int32_t mode = mAppOpsManager->noteOp(AppOpsManager::OP_CAMERA, mClientUid,
-                mClientPackageName, mClientFeatureId,
-                String16("start camera ") + String16(mCameraIdStr));
+                toString16(mClientPackageName), toString16(mClientFeatureId),
+                toString16("start camera ") + toString16(mCameraIdStr));
         status_t res = handleAppOpMode(mode);
         if (res != OK) {
             return res;
@@ -3778,7 +3747,7 @@
 
     if (mAppOpsManager != nullptr) {
         mAppOpsManager->finishOp(AppOpsManager::OP_CAMERA, mClientUid,
-                mClientPackageName, mClientFeatureId);
+                toString16(mClientPackageName), toString16(mClientFeatureId));
         mOpsStreaming = false;
     }
 
@@ -3834,7 +3803,7 @@
 
     int32_t res;
     res = mAppOpsManager->checkOp(AppOpsManager::OP_CAMERA,
-            mClientUid, mClientPackageName);
+            mClientUid, toString16(mClientPackageName));
     ALOGV("checkOp returns: %d, %s ", res,
             res == AppOpsManager::MODE_ALLOWED ? "ALLOWED" :
             res == AppOpsManager::MODE_IGNORED ? "IGNORED" :
@@ -3842,15 +3811,15 @@
             "UNKNOWN");
 
     if (res == AppOpsManager::MODE_ERRORED) {
-        ALOGI("Camera %s: Access for \"%s\" revoked", mCameraIdStr.string(),
-              String8(mClientPackageName).string());
+        ALOGI("Camera %s: Access for \"%s\" revoked", mCameraIdStr.c_str(),
+              mClientPackageName.c_str());
         block();
     } else if (res == AppOpsManager::MODE_IGNORED) {
         bool isUidActive = sCameraService->mUidPolicy->isUidActive(mClientUid, mClientPackageName);
         bool isCameraPrivacyEnabled =
                 sCameraService->mSensorPrivacyPolicy->isCameraPrivacyEnabled();
         ALOGI("Camera %s: Access for \"%s\" has been restricted, isUidTrusted %d, isUidActive %d",
-                mCameraIdStr.string(), String8(mClientPackageName).string(),
+                mCameraIdStr.c_str(), mClientPackageName.c_str(),
                 mUidIsTrusted, isUidActive);
         // If the calling Uid is trusted (a native service), or the client Uid is active (WAR for
         // b/175320666), the AppOpsManager could return MODE_IGNORED. Do not treat such cases as
@@ -3931,7 +3900,7 @@
             | ActivityManager::UID_OBSERVER_ACTIVE | ActivityManager::UID_OBSERVER_PROCSTATE
             | ActivityManager::UID_OBSERVER_PROC_OOM_ADJ,
             ActivityManager::PROCESS_STATE_UNKNOWN,
-            String16("cameraserver"), emptyUidArray, 0, mObserverToken);
+            toString16(kServiceName), emptyUidArray, 0, mObserverToken);
     if (res == OK) {
         mRegistered = true;
         ALOGV("UidPolicy: Registered with ActivityManager");
@@ -3941,7 +3910,7 @@
 }
 
 void CameraService::UidPolicy::onServiceRegistration(const String16& name, const sp<IBinder>&) {
-    if (name != String16(kActivityServiceName)) {
+    if (name != toString16(kActivityServiceName)) {
         return;
     }
 
@@ -3953,9 +3922,9 @@
     // If not available then register for notifications, instead of blocking
     // till the service is ready
     sp<IServiceManager> sm = defaultServiceManager();
-    sp<IBinder> binder = sm->checkService(String16(kActivityServiceName));
+    sp<IBinder> binder = sm->checkService(toString16(kActivityServiceName));
     if (!binder) {
-        sm->registerForNotifications(String16(kActivityServiceName), this);
+        sm->registerForNotifications(toString16(kActivityServiceName), this);
     } else {
         registerWithActivityManager();
     }
@@ -4074,7 +4043,7 @@
         monitoredUid.procAdj = resource_policy::UNKNOWN_ADJ;
         monitoredUid.refCount = 1;
         it = mMonitoredUids.emplace(std::pair<uid_t, MonitoredUid>(uid, monitoredUid)).first;
-        status_t res = mAm.addUidToObserver(mObserverToken, String16("cameraserver"), uid);
+        status_t res = mAm.addUidToObserver(mObserverToken, toString16(kServiceName), uid);
         if (res != OK) {
             ALOGE("UidPolicy: Failed to add uid to observer: 0x%08x", res);
         }
@@ -4095,7 +4064,7 @@
         it->second.refCount--;
         if (it->second.refCount == 0) {
             mMonitoredUids.erase(it);
-            status_t res = mAm.removeUidFromObserver(mObserverToken, String16("cameraserver"), uid);
+            status_t res = mAm.removeUidFromObserver(mObserverToken, toString16(kServiceName), uid);
             if (res != OK) {
                 ALOGE("UidPolicy: Failed to remove uid from observer: 0x%08x", res);
             }
@@ -4107,7 +4076,7 @@
     }
 }
 
-bool CameraService::UidPolicy::isUidActive(uid_t uid, String16 callingPackage) {
+bool CameraService::UidPolicy::isUidActive(uid_t uid, const std::string &callingPackage) {
     Mutex::Autolock _l(mUidLock);
     return isUidActiveLocked(uid, callingPackage);
 }
@@ -4115,7 +4084,7 @@
 static const int64_t kPollUidActiveTimeoutTotalMillis = 300;
 static const int64_t kPollUidActiveTimeoutMillis = 50;
 
-bool CameraService::UidPolicy::isUidActiveLocked(uid_t uid, String16 callingPackage) {
+bool CameraService::UidPolicy::isUidActiveLocked(uid_t uid, const std::string &callingPackage) {
     // Non-app UIDs are considered always active
     // If activity manager is unreachable, assume everything is active
     if (uid < FIRST_APPLICATION_UID || !mRegistered) {
@@ -4142,7 +4111,7 @@
             // some polling which should happen pretty rarely anyway as the race is hard
             // to hit.
             active = mActiveUids.find(uid) != mActiveUids.end();
-            if (!active) active = am.isUidActive(uid, callingPackage);
+            if (!active) active = am.isUidActive(uid, toString16(callingPackage));
             if (active) {
                 break;
             }
@@ -4182,12 +4151,12 @@
     return procState;
 }
 
-void CameraService::UidPolicy::UidPolicy::addOverrideUid(uid_t uid,
-        String16 callingPackage, bool active) {
+void CameraService::UidPolicy::addOverrideUid(uid_t uid,
+        const std::string &callingPackage, bool active) {
     updateOverrideUid(uid, callingPackage, active, true);
 }
 
-void CameraService::UidPolicy::removeOverrideUid(uid_t uid, String16 callingPackage) {
+void CameraService::UidPolicy::removeOverrideUid(uid_t uid, const std::string &callingPackage) {
     updateOverrideUid(uid, callingPackage, false, false);
 }
 
@@ -4198,7 +4167,7 @@
     mActiveUids.clear();
 }
 
-void CameraService::UidPolicy::updateOverrideUid(uid_t uid, String16 callingPackage,
+void CameraService::UidPolicy::updateOverrideUid(uid_t uid, const std::string &callingPackage,
         bool active, bool insert) {
     bool wasActive = false;
     bool isActive = false;
@@ -4241,7 +4210,7 @@
 
 void CameraService::SensorPrivacyPolicy::onServiceRegistration(const String16& name,
                                                                const sp<IBinder>&) {
-    if (name != String16(kSensorPrivacyServiceName)) {
+    if (name != toString16(kSensorPrivacyServiceName)) {
         return;
     }
 
@@ -4252,9 +4221,9 @@
     // Use checkservice to see if the sensor_privacy service is available
     // If service is not available then register for notification
     sp<IServiceManager> sm = defaultServiceManager();
-    sp<IBinder> binder = sm->checkService(String16(kSensorPrivacyServiceName));
+    sp<IBinder> binder = sm->checkService(toString16(kSensorPrivacyServiceName));
     if (!binder) {
-        sm->registerForNotifications(String16(kSensorPrivacyServiceName),this);
+        sm->registerForNotifications(toString16(kSensorPrivacyServiceName),this);
     } else {
         registerWithSensorPrivacyManager();
     }
@@ -4318,8 +4287,8 @@
 //                  CameraState
 // ----------------------------------------------------------------------------
 
-CameraService::CameraState::CameraState(const String8& id, int cost,
-        const std::set<String8>& conflicting, SystemCameraKind systemCameraKind,
+CameraService::CameraState::CameraState(const std::string& id, int cost,
+        const std::set<std::string>& conflicting, SystemCameraKind systemCameraKind,
         const std::vector<std::string>& physicalCameras) : mId(id),
         mStatus(StatusInternal::NOT_PRESENT), mCost(cost), mConflicting(conflicting),
         mSystemCameraKind(systemCameraKind), mPhysicalCameras(physicalCameras) {}
@@ -4331,9 +4300,9 @@
     return mStatus;
 }
 
-std::vector<String8> CameraService::CameraState::getUnavailablePhysicalIds() const {
+std::vector<std::string> CameraService::CameraState::getUnavailablePhysicalIds() const {
     Mutex::Autolock lock(mStatusLock);
-    std::vector<String8> res(mUnavailablePhysicalIds.begin(), mUnavailablePhysicalIds.end());
+    std::vector<std::string> res(mUnavailablePhysicalIds.begin(), mUnavailablePhysicalIds.end());
     return res;
 }
 
@@ -4349,14 +4318,10 @@
     return mCost;
 }
 
-std::set<String8> CameraService::CameraState::getConflicting() const {
+std::set<std::string> CameraService::CameraState::getConflicting() const {
     return mConflicting;
 }
 
-String8 CameraService::CameraState::getId() const {
-    return mId;
-}
-
 SystemCameraKind CameraService::CameraState::getSystemCameraKind() const {
     return mSystemCameraKind;
 }
@@ -4366,24 +4331,24 @@
             != mPhysicalCameras.end();
 }
 
-bool CameraService::CameraState::addUnavailablePhysicalId(const String8& physicalId) {
+bool CameraService::CameraState::addUnavailablePhysicalId(const std::string& physicalId) {
     Mutex::Autolock lock(mStatusLock);
     auto result = mUnavailablePhysicalIds.insert(physicalId);
     return result.second;
 }
 
-bool CameraService::CameraState::removeUnavailablePhysicalId(const String8& physicalId) {
+bool CameraService::CameraState::removeUnavailablePhysicalId(const std::string& physicalId) {
     Mutex::Autolock lock(mStatusLock);
     auto count = mUnavailablePhysicalIds.erase(physicalId);
     return count > 0;
 }
 
-void CameraService::CameraState::setClientPackage(const String8& clientPackage) {
+void CameraService::CameraState::setClientPackage(const std::string& clientPackage) {
     Mutex::Autolock lock(mStatusLock);
     mClientPackage = clientPackage;
 }
 
-String8 CameraService::CameraState::getClientPackage() const {
+std::string CameraService::CameraState::getClientPackage() const {
     Mutex::Autolock lock(mStatusLock);
     return mClientPackage;
 }
@@ -4393,23 +4358,23 @@
 // ----------------------------------------------------------------------------
 
 void CameraService::ClientEventListener::onClientAdded(
-        const resource_policy::ClientDescriptor<String8,
+        const resource_policy::ClientDescriptor<std::string,
         sp<CameraService::BasicClient>>& descriptor) {
     const auto& basicClient = descriptor.getValue();
     if (basicClient.get() != nullptr) {
         BatteryNotifier& notifier(BatteryNotifier::getInstance());
-        notifier.noteStartCamera(descriptor.getKey(),
+        notifier.noteStartCamera(toString8(descriptor.getKey()),
                 static_cast<int>(basicClient->getClientUid()));
     }
 }
 
 void CameraService::ClientEventListener::onClientRemoved(
-        const resource_policy::ClientDescriptor<String8,
+        const resource_policy::ClientDescriptor<std::string,
         sp<CameraService::BasicClient>>& descriptor) {
     const auto& basicClient = descriptor.getValue();
     if (basicClient.get() != nullptr) {
         BatteryNotifier& notifier(BatteryNotifier::getInstance());
-        notifier.noteStopCamera(descriptor.getKey(),
+        notifier.noteStopCamera(toString8(descriptor.getKey()),
                 static_cast<int>(basicClient->getClientUid()));
     }
 }
@@ -4426,7 +4391,7 @@
 CameraService::CameraClientManager::~CameraClientManager() {}
 
 sp<CameraService::BasicClient> CameraService::CameraClientManager::getCameraClient(
-        const String8& id) const {
+        const std::string& id) const {
     auto descriptor = get(id);
     if (descriptor == nullptr) {
         return sp<BasicClient>{nullptr};
@@ -4434,56 +4399,57 @@
     return descriptor->getValue();
 }
 
-String8 CameraService::CameraClientManager::toString() const {
+std::string CameraService::CameraClientManager::toString() const {
     auto all = getAll();
-    String8 ret("[");
+    std::ostringstream ret;
+    ret << "[";
     bool hasAny = false;
     for (auto& i : all) {
         hasAny = true;
-        String8 key = i->getKey();
+        std::string key = i->getKey();
         int32_t cost = i->getCost();
         int32_t pid = i->getOwnerId();
         int32_t score = i->getPriority().getScore();
         int32_t state = i->getPriority().getState();
         auto conflicting = i->getConflicting();
         auto clientSp = i->getValue();
-        String8 packageName;
+        std::string packageName;
         userid_t clientUserId = 0;
         if (clientSp.get() != nullptr) {
-            packageName = String8{clientSp->getPackageName()};
+            packageName = clientSp->getPackageName();
             uid_t clientUid = clientSp->getClientUid();
             clientUserId = multiuser_get_user_id(clientUid);
         }
-        ret.appendFormat("\n(Camera ID: %s, Cost: %" PRId32 ", PID: %" PRId32 ", Score: %"
-                PRId32 ", State: %" PRId32, key.string(), cost, pid, score, state);
+        ret << fmt::sprintf("\n(Camera ID: %s, Cost: %" PRId32 ", PID: %" PRId32 ", Score: %"
+                PRId32 ", State: %" PRId32, key.c_str(), cost, pid, score, state);
 
         if (clientSp.get() != nullptr) {
-            ret.appendFormat("User Id: %d, ", clientUserId);
+            ret << fmt::sprintf("User Id: %d, ", clientUserId);
         }
         if (packageName.size() != 0) {
-            ret.appendFormat("Client Package Name: %s", packageName.string());
+            ret << fmt::sprintf("Client Package Name: %s", packageName.c_str());
         }
 
-        ret.append(", Conflicting Client Devices: {");
+        ret << ", Conflicting Client Devices: {";
         for (auto& j : conflicting) {
-            ret.appendFormat("%s, ", j.string());
+            ret << fmt::sprintf("%s, ", j.c_str());
         }
-        ret.append("})");
+        ret << "})";
     }
-    if (hasAny) ret.append("\n");
-    ret.append("]\n");
-    return ret;
+    if (hasAny) ret << "\n";
+    ret << "]\n";
+    return std::move(ret.str());
 }
 
 CameraService::DescriptorPtr CameraService::CameraClientManager::makeClientDescriptor(
-        const String8& key, const sp<BasicClient>& value, int32_t cost,
-        const std::set<String8>& conflictingKeys, int32_t score, int32_t ownerId,
+        const std::string& key, const sp<BasicClient>& value, int32_t cost,
+        const std::set<std::string>& conflictingKeys, int32_t score, int32_t ownerId,
         int32_t state, int32_t oomScoreOffset, bool systemNativeClient) {
 
     int32_t score_adj = systemNativeClient ? kSystemNativeClientScore : score;
-    int32_t state_adj = systemNativeClient ? kSystemNativeClientState: state;
+    int32_t state_adj = systemNativeClient ? kSystemNativeClientState : state;
 
-    return std::make_shared<resource_policy::ClientDescriptor<String8, sp<BasicClient>>>(
+    return std::make_shared<resource_policy::ClientDescriptor<std::string, sp<BasicClient>>>(
             key, value, cost, conflictingKeys, score_adj, ownerId, state_adj,
             systemNativeClient, oomScoreOffset);
 }
@@ -4522,7 +4488,7 @@
 }
 
 void CameraService::InjectionStatusListener::notifyInjectionError(
-        String8 injectedCamId, status_t err) {
+        const std::string &injectedCamId, status_t err) {
     if (mCameraInjectionCallback == nullptr) {
         ALOGW("InjectionStatusListener: mCameraInjectionCallback == nullptr");
         return;
@@ -4533,37 +4499,37 @@
             mCameraInjectionCallback->onInjectionError(
                     ICameraInjectionCallback::ERROR_INJECTION_SESSION);
             ALOGE("No camera device with ID \"%s\" currently available!",
-                    injectedCamId.string());
+                    injectedCamId.c_str());
             break;
         case -EBUSY:
             mCameraInjectionCallback->onInjectionError(
                     ICameraInjectionCallback::ERROR_INJECTION_SESSION);
             ALOGE("Higher-priority client using camera, ID \"%s\" currently unavailable!",
-                    injectedCamId.string());
+                    injectedCamId.c_str());
             break;
         case DEAD_OBJECT:
             mCameraInjectionCallback->onInjectionError(
                     ICameraInjectionCallback::ERROR_INJECTION_SESSION);
             ALOGE("Camera ID \"%s\" object is dead!",
-                    injectedCamId.string());
+                    injectedCamId.c_str());
             break;
         case INVALID_OPERATION:
             mCameraInjectionCallback->onInjectionError(
                     ICameraInjectionCallback::ERROR_INJECTION_SESSION);
             ALOGE("Camera ID \"%s\" encountered an operating or internal error!",
-                    injectedCamId.string());
+                    injectedCamId.c_str());
             break;
         case UNKNOWN_TRANSACTION:
             mCameraInjectionCallback->onInjectionError(
                     ICameraInjectionCallback::ERROR_INJECTION_UNSUPPORTED);
             ALOGE("Camera ID \"%s\" method doesn't support!",
-                    injectedCamId.string());
+                    injectedCamId.c_str());
             break;
         default:
             mCameraInjectionCallback->onInjectionError(
                     ICameraInjectionCallback::ERROR_INJECTION_INVALID_ERROR);
             ALOGE("Unexpected error %s (%d) opening camera \"%s\"!",
-                    strerror(-err), err, injectedCamId.string());
+                    strerror(-err), err, injectedCamId.c_str());
     }
 }
 
@@ -4639,10 +4605,10 @@
         Mutex::Autolock l(mCameraStatesLock);
         // Start collecting the info for open sessions and store it in temp file.
         for (const auto& state : mCameraStates) {
-            String8 cameraId = state.first;
+            std::string cameraId = state.first;
             auto clientDescriptor = mActiveClientManager.get(cameraId);
             if (clientDescriptor != nullptr) {
-                dprintf(mMemFd, "== Camera device %s dynamic info: ==\n", cameraId.string());
+                dprintf(mMemFd, "== Camera device %s dynamic info: ==\n", cameraId.c_str());
                 // Log the current open session info before device is disconnected.
                 dumpOpenSessionClientLogs(mMemFd, args, cameraId);
             }
@@ -4653,7 +4619,7 @@
 status_t CameraService::dump(int fd, const Vector<String16>& args) {
     ATRACE_CALL();
 
-    if (checkCallingPermission(sDumpPermission) == false) {
+    if (checkCallingPermission(toString16(sDumpPermission)) == false) {
         dprintf(fd, "Permission Denial: can't dump CameraService from pid=%d, uid=%d\n",
                 CameraThreadState::getCallingPid(),
                 CameraThreadState::getCallingUid());
@@ -4682,9 +4648,9 @@
     for (size_t i = 0; i < mNormalDeviceIds.size(); i++) {
         dprintf(fd, "    Device %zu maps to \"%s\"\n", i, mNormalDeviceIds[i].c_str());
     }
-    String8 activeClientString = mActiveClientManager.toString();
-    dprintf(fd, "Active Camera Clients:\n%s", activeClientString.string());
-    dprintf(fd, "Allowed user IDs: %s\n", toString(mAllowedUsers).string());
+    std::string activeClientString = mActiveClientManager.toString();
+    dprintf(fd, "Active Camera Clients:\n%s", activeClientString.c_str());
+    dprintf(fd, "Allowed user IDs: %s\n", toString(mAllowedUsers).c_str());
     if (mStreamUseCaseOverrides.size() > 0) {
         dprintf(fd, "Active stream use case overrides:");
         for (int64_t useCaseOverride : mStreamUseCaseOverrides) {
@@ -4702,18 +4668,18 @@
 
     int argSize = args.size();
     for (int i = 0; i < argSize; i++) {
-        if (args[i] == TagMonitor::kMonitorOption) {
+        if (args[i] == toString16(TagMonitor::kMonitorOption)) {
             if (i + 1 < argSize) {
-                mMonitorTags = String8(args[i + 1]);
+                mMonitorTags = toStdString(args[i + 1]);
             }
             break;
         }
     }
 
     for (auto& state : mCameraStates) {
-        String8 cameraId = state.first;
+        const std::string &cameraId = state.first;
 
-        dprintf(fd, "== Camera device %s dynamic info: ==\n", cameraId.string());
+        dprintf(fd, "== Camera device %s dynamic info: ==\n", cameraId.c_str());
 
         CameraParameters p = state.second->getShimParams();
         if (!p.isEmpty()) {
@@ -4764,8 +4730,8 @@
         if (args[i] == verboseOption) {
             // change logging level
             if (i + 1 >= n) continue;
-            String8 levelStr(args[i+1]);
-            int level = atoi(levelStr.string());
+            std::string levelStr = toStdString(args[i+1]);
+            int level = atoi(levelStr.c_str());
             dprintf(fd, "\nSetting log level to %d.\n", level);
             setLogLevel(level);
         } else if (args[i] == unreachableOption) {
@@ -4811,11 +4777,11 @@
 }
 
 void CameraService::dumpOpenSessionClientLogs(int fd,
-        const Vector<String16>& args, const String8& cameraId) {
+        const Vector<String16>& args, const std::string& cameraId) {
     auto clientDescriptor = mActiveClientManager.get(cameraId);
     dprintf(fd, "  %s : Device %s is open. Client instance dump:\n",
-            getFormattedCurrentTime().string(),
-            cameraId.string());
+            getFormattedCurrentTime().c_str(),
+            cameraId.c_str());
     dprintf(fd, "    Client priority score: %d state: %d\n",
         clientDescriptor->getPriority().getScore(),
         clientDescriptor->getPriority().getState());
@@ -4823,14 +4789,14 @@
 
     auto client = clientDescriptor->getValue();
     dprintf(fd, "    Client package: %s\n",
-        String8(client->getPackageName()).string());
+        client->getPackageName().c_str());
 
     client->dumpClient(fd, args);
 }
 
-void CameraService::dumpClosedSessionClientLogs(int fd, const String8& cameraId) {
+void CameraService::dumpClosedSessionClientLogs(int fd, const std::string& cameraId) {
     dprintf(fd, "  Device %s is closed, no client instance\n",
-                    cameraId.string());
+                    cameraId.c_str());
 }
 
 void CameraService::dumpEventLog(int fd) {
@@ -4838,7 +4804,7 @@
 
     Mutex::Autolock l(mLogLock);
     for (const auto& msg : mEventLog) {
-        dprintf(fd, "  %s\n", msg.string());
+        dprintf(fd, "  %s\n", msg.c_str());
     }
 
     if (mEventLog.size() == DEFAULT_EVENT_LOG_LENGTH) {
@@ -4849,7 +4815,7 @@
     dprintf(fd, "\n");
 }
 
-void CameraService::cacheClientTagDumpIfNeeded(const char *cameraId, BasicClient* client) {
+void CameraService::cacheClientTagDumpIfNeeded(const std::string &cameraId, BasicClient* client) {
     Mutex::Autolock lock(mLogLock);
     if (!isClientWatchedLocked(client)) { return; }
 
@@ -4858,34 +4824,26 @@
 
     if (dumpVector.empty()) { return; }
 
-    std::string dumpString;
+    std::ostringstream dumpString;
 
-    String8 currentTime = getFormattedCurrentTime();
-    dumpString += "Cached @ ";
-    dumpString += currentTime.string();
-    dumpString += "\n"; // First line is the timestamp of when client is cached.
-
-
-    const String16 &packageName = client->getPackageName();
-
-    String8 packageName8 = String8(packageName);
-    const char *printablePackageName = packageName8.lockBuffer(packageName.size());
-
+    std::string currentTime = getFormattedCurrentTime();
+    dumpString << "Cached @ ";
+    dumpString << currentTime;
+    dumpString << "\n"; // First line is the timestamp of when client is cached.
 
     size_t i = dumpVector.size();
 
     // Store the string in reverse order (latest last)
     while (i > 0) {
          i--;
-         dumpString += cameraId;
-         dumpString += ":";
-         dumpString += printablePackageName;
-         dumpString += "  ";
-         dumpString += dumpVector[i]; // implicitly ends with '\n'
+         dumpString << cameraId;
+         dumpString << ":";
+         dumpString << client->getPackageName();
+         dumpString << "  ";
+         dumpString << dumpVector[i]; // implicitly ends with '\n'
     }
 
-    packageName8.unlockBuffer();
-    mWatchedClientsDumpCache[packageName] = dumpString;
+    mWatchedClientsDumpCache[client->getPackageName()] = dumpString.str();
 }
 
 void CameraService::handleTorchClientBinderDied(const wp<IBinder> &who) {
@@ -4893,7 +4851,7 @@
     for (size_t i = 0; i < mTorchClientMap.size(); i++) {
         if (mTorchClientMap[i] == who) {
             // turn off the torch mode that was turned on by dead client
-            String8 cameraId = mTorchClientMap.keyAt(i);
+            std::string cameraId = mTorchClientMap.keyAt(i);
             status_t res = mFlashlight->setTorchMode(cameraId, false);
             if (res) {
                 ALOGE("%s: torch client died but couldn't turn off torch: "
@@ -4913,7 +4871,7 @@
       * binder driver
       */
     // PID here is approximate and can be wrong.
-    logClientDied(CameraThreadState::getCallingPid(), String8("Binder died unexpectedly"));
+    logClientDied(CameraThreadState::getCallingPid(), "Binder died unexpectedly");
 
     // check torch client
     handleTorchClientBinderDied(who);
@@ -4928,11 +4886,11 @@
             __FUNCTION__);
 }
 
-void CameraService::updateStatus(StatusInternal status, const String8& cameraId) {
+void CameraService::updateStatus(StatusInternal status, const std::string& cameraId) {
     updateStatus(status, cameraId, {});
 }
 
-void CameraService::updateStatus(StatusInternal status, const String8& cameraId,
+void CameraService::updateStatus(StatusInternal status, const std::string& cameraId,
         std::initializer_list<StatusInternal> rejectSourceStates) {
     // Do not lock mServiceLock here or can get into a deadlock from
     // connect() -> disconnect -> updateStatus
@@ -4941,14 +4899,14 @@
 
     if (state == nullptr) {
         ALOGW("%s: Could not update the status for %s, no such device exists", __FUNCTION__,
-                cameraId.string());
+                cameraId.c_str());
         return;
     }
 
     // Avoid calling getSystemCameraKind() with mStatusListenerLock held (b/141756275)
     SystemCameraKind deviceKind = SystemCameraKind::PUBLIC;
     if (getSystemCameraKind(cameraId, &deviceKind) != OK) {
-        ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, cameraId.string());
+        ALOGE("%s: Invalid camera id %s, skipping", __FUNCTION__, cameraId.c_str());
         return;
     }
 
@@ -4959,7 +4917,7 @@
     // of the listeners with both the mStatusLock and mStatusListenerLock held
     state->updateStatus(status, cameraId, rejectSourceStates, [this, &deviceKind,
                         &logicalCameraIds]
-            (const String8& cameraId, StatusInternal status) {
+            (const std::string& cameraId, StatusInternal status) {
 
             if (status != StatusInternal::ENUMERATING) {
                 // Update torch status if it has a flash unit.
@@ -4978,7 +4936,7 @@
             }
 
             Mutex::Autolock lock(mStatusListenerLock);
-            notifyPhysicalCameraStatusLocked(mapToInterface(status), String16(cameraId),
+            notifyPhysicalCameraStatusLocked(mapToInterface(status), cameraId,
                     logicalCameraIds, deviceKind);
 
             for (auto& listener : mListenerList) {
@@ -4991,7 +4949,7 @@
                     continue;
                 }
                 auto ret = listener->getListener()->onStatusChanged(mapToInterface(status),
-                        String16(cameraId));
+                        cameraId);
                 listener->handleBinderStatus(ret,
                         "%s: Failed to trigger onStatusChanged callback for %d:%d: %d",
                         __FUNCTION__, listener->getListenerUid(), listener->getListenerPid(),
@@ -5000,18 +4958,18 @@
         });
 }
 
-void CameraService::updateOpenCloseStatus(const String8& cameraId, bool open,
-        const String16& clientPackageName) {
+void CameraService::updateOpenCloseStatus(const std::string& cameraId, bool open,
+        const std::string& clientPackageName) {
     auto state = getCameraState(cameraId);
     if (state == nullptr) {
         ALOGW("%s: Could not update the status for %s, no such device exists", __FUNCTION__,
-                cameraId.string());
+                cameraId.c_str());
         return;
     }
     if (open) {
-        state->setClientPackage(String8(clientPackageName));
+        state->setClientPackage(clientPackageName);
     } else {
-        state->setClientPackage(String8::empty());
+        state->setClientPackage(std::string());
     }
 
     Mutex::Autolock lock(mStatusListenerLock);
@@ -5022,11 +4980,10 @@
         }
 
         binder::Status ret;
-        String16 cameraId64(cameraId);
         if (open) {
-            ret = it->getListener()->onCameraOpened(cameraId64, clientPackageName);
+            ret = it->getListener()->onCameraOpened(cameraId, clientPackageName);
         } else {
-            ret = it->getListener()->onCameraClosed(cameraId64);
+            ret = it->getListener()->onCameraClosed(cameraId);
         }
 
         it->handleBinderStatus(ret,
@@ -5037,7 +4994,7 @@
 
 template<class Func>
 void CameraService::CameraState::updateStatus(StatusInternal status,
-        const String8& cameraId,
+        const std::string& cameraId,
         std::initializer_list<StatusInternal> rejectSourceStates,
         Func onStatusUpdatedLocked) {
     Mutex::Autolock lock(mStatusLock);
@@ -5049,7 +5006,7 @@
     }
 
     ALOGV("%s: Status has changed for camera ID %s from %#x to %#x", __FUNCTION__,
-            cameraId.string(), oldStatus, status);
+            cameraId.c_str(), oldStatus, status);
 
     if (oldStatus == StatusInternal::NOT_PRESENT &&
             (status != StatusInternal::PRESENT &&
@@ -5069,7 +5026,7 @@
     for (auto& rejectStatus : rejectSourceStates) {
         if (oldStatus == rejectStatus) {
             ALOGV("%s: Rejecting status transition for Camera ID %s,  since the source "
-                    "state was was in one of the bad states.", __FUNCTION__, cameraId.string());
+                    "state was was in one of the bad states.", __FUNCTION__, cameraId.c_str());
             mStatus = oldStatus;
             return;
         }
@@ -5079,7 +5036,7 @@
 }
 
 status_t CameraService::getTorchStatusLocked(
-        const String8& cameraId,
+        const std::string& cameraId,
         TorchModeStatus *status) const {
     if (!status) {
         return BAD_VALUE;
@@ -5094,7 +5051,7 @@
     return OK;
 }
 
-status_t CameraService::setTorchStatusLocked(const String8& cameraId,
+status_t CameraService::setTorchStatusLocked(const std::string& cameraId,
         TorchModeStatus status) {
     ssize_t index = mTorchStatusMap.indexOfKey(cameraId);
     if (index == NAME_NOT_FOUND) {
@@ -5105,20 +5062,20 @@
     return OK;
 }
 
-std::list<String16> CameraService::getLogicalCameras(
-        const String8& physicalCameraId) {
-    std::list<String16> retList;
+std::list<std::string> CameraService::getLogicalCameras(
+        const std::string& physicalCameraId) {
+    std::list<std::string> retList;
     Mutex::Autolock lock(mCameraStatesLock);
     for (const auto& state : mCameraStates) {
-        if (state.second->containsPhysicalCamera(physicalCameraId.c_str())) {
-            retList.emplace_back(String16(state.first));
+        if (state.second->containsPhysicalCamera(physicalCameraId)) {
+            retList.emplace_back(state.first);
         }
     }
     return retList;
 }
 
 void CameraService::notifyPhysicalCameraStatusLocked(int32_t status,
-        const String16& physicalCameraId, const std::list<String16>& logicalCameraIds,
+        const std::string& physicalCameraId, const std::list<std::string>& logicalCameraIds,
         SystemCameraKind deviceKind) {
     // mStatusListenerLock is expected to be locked
     for (const auto& logicalCameraId : logicalCameraIds) {
@@ -5129,7 +5086,7 @@
             if (shouldSkipStatusUpdates(deviceKind, listener->isVendorListener(),
                     listener->getListenerPid(), listener->getListenerUid())) {
                 ALOGV("Skipping discovery callback for system-only camera device %s",
-                        String8(physicalCameraId).c_str());
+                        physicalCameraId.c_str());
                 continue;
             }
             auto ret = listener->getListener()->onPhysicalCameraStatusChanged(status,
@@ -5169,44 +5126,44 @@
 
 // NOTE: This is a remote API - make sure all args are validated
 status_t CameraService::shellCommand(int in, int out, int err, const Vector<String16>& args) {
-    if (!checkCallingPermission(sManageCameraPermission, nullptr, nullptr)) {
+    if (!checkCallingPermission(toString16(sManageCameraPermission), nullptr, nullptr)) {
         return PERMISSION_DENIED;
     }
     if (in == BAD_TYPE || out == BAD_TYPE || err == BAD_TYPE) {
         return BAD_VALUE;
     }
-    if (args.size() >= 3 && args[0] == String16("set-uid-state")) {
+    if (args.size() >= 3 && args[0] == toString16("set-uid-state")) {
         return handleSetUidState(args, err);
-    } else if (args.size() >= 2 && args[0] == String16("reset-uid-state")) {
+    } else if (args.size() >= 2 && args[0] == toString16("reset-uid-state")) {
         return handleResetUidState(args, err);
-    } else if (args.size() >= 2 && args[0] == String16("get-uid-state")) {
+    } else if (args.size() >= 2 && args[0] == toString16("get-uid-state")) {
         return handleGetUidState(args, out, err);
-    } else if (args.size() >= 2 && args[0] == String16("set-rotate-and-crop")) {
+    } else if (args.size() >= 2 && args[0] == toString16("set-rotate-and-crop")) {
         return handleSetRotateAndCrop(args);
-    } else if (args.size() >= 1 && args[0] == String16("get-rotate-and-crop")) {
+    } else if (args.size() >= 1 && args[0] == toString16("get-rotate-and-crop")) {
         return handleGetRotateAndCrop(out);
-    } else if (args.size() >= 2 && args[0] == String16("set-autoframing")) {
+    } else if (args.size() >= 2 && args[0] == toString16("set-autoframing")) {
         return handleSetAutoframing(args);
-    } else if (args.size() >= 1 && args[0] == String16("get-autoframing")) {
+    } else if (args.size() >= 1 && args[0] == toString16("get-autoframing")) {
         return handleGetAutoframing(out);
-    } else if (args.size() >= 2 && args[0] == String16("set-image-dump-mask")) {
+    } else if (args.size() >= 2 && args[0] == toString16("set-image-dump-mask")) {
         return handleSetImageDumpMask(args);
-    } else if (args.size() >= 1 && args[0] == String16("get-image-dump-mask")) {
+    } else if (args.size() >= 1 && args[0] == toString16("get-image-dump-mask")) {
         return handleGetImageDumpMask(out);
-    } else if (args.size() >= 2 && args[0] == String16("set-camera-mute")) {
+    } else if (args.size() >= 2 && args[0] == toString16("set-camera-mute")) {
         return handleSetCameraMute(args);
-    } else if (args.size() >= 2 && args[0] == String16("set-stream-use-case-override")) {
+    } else if (args.size() >= 2 && args[0] == toString16("set-stream-use-case-override")) {
         return handleSetStreamUseCaseOverrides(args);
-    } else if (args.size() >= 1 && args[0] == String16("clear-stream-use-case-override")) {
+    } else if (args.size() >= 1 && args[0] == toString16("clear-stream-use-case-override")) {
         handleClearStreamUseCaseOverrides();
         return OK;
-    } else if (args.size() >= 1 && args[0] == String16("set-zoom-override")) {
+    } else if (args.size() >= 1 && args[0] == toString16("set-zoom-override")) {
         return handleSetZoomOverride(args);
-    } else if (args.size() >= 2 && args[0] == String16("watch")) {
+    } else if (args.size() >= 2 && args[0] == toString16("watch")) {
         return handleWatchCommand(args, in, out);
-    } else if (args.size() >= 2 && args[0] == String16("set-watchdog")) {
+    } else if (args.size() >= 2 && args[0] == toString16("set-watchdog")) {
         return handleSetCameraServiceWatchdog(args);
-    } else if (args.size() == 1 && args[0] == String16("help")) {
+    } else if (args.size() == 1 && args[0] == toString16("help")) {
         printHelp(out);
         return OK;
     }
@@ -5215,19 +5172,19 @@
 }
 
 status_t CameraService::handleSetUidState(const Vector<String16>& args, int err) {
-    String16 packageName = args[1];
+    std::string packageName = toStdString(args[1]);
 
     bool active = false;
-    if (args[2] == String16("active")) {
+    if (args[2] == toString16("active")) {
         active = true;
-    } else if ((args[2] != String16("idle"))) {
-        ALOGE("Expected active or idle but got: '%s'", String8(args[2]).string());
+    } else if ((args[2] != toString16("idle"))) {
+        ALOGE("Expected active or idle but got: '%s'", toStdString(args[2]).c_str());
         return BAD_VALUE;
     }
 
     int userId = 0;
-    if (args.size() >= 5 && args[3] == String16("--user")) {
-        userId = atoi(String8(args[4]));
+    if (args.size() >= 5 && args[3] == toString16("--user")) {
+        userId = atoi(toStdString(args[4]).c_str());
     }
 
     uid_t uid;
@@ -5240,11 +5197,11 @@
 }
 
 status_t CameraService::handleResetUidState(const Vector<String16>& args, int err) {
-    String16 packageName = args[1];
+    std::string packageName = toStdString(args[1]);
 
     int userId = 0;
-    if (args.size() >= 4 && args[2] == String16("--user")) {
-        userId = atoi(String8(args[3]));
+    if (args.size() >= 4 && args[2] == toString16("--user")) {
+        userId = atoi(toStdString(args[3]).c_str());
     }
 
     uid_t uid;
@@ -5257,11 +5214,11 @@
 }
 
 status_t CameraService::handleGetUidState(const Vector<String16>& args, int out, int err) {
-    String16 packageName = args[1];
+    std::string packageName = toStdString(args[1]);
 
     int userId = 0;
-    if (args.size() >= 4 && args[2] == String16("--user")) {
-        userId = atoi(String8(args[3]));
+    if (args.size() >= 4 && args[2] == toString16("--user")) {
+        userId = atoi(toStdString(args[3]).c_str());
     }
 
     uid_t uid;
@@ -5277,7 +5234,7 @@
 }
 
 status_t CameraService::handleSetRotateAndCrop(const Vector<String16>& args) {
-    int rotateValue = atoi(String8(args[1]));
+    int rotateValue = atoi(toStdString(args[1]).c_str());
     if (rotateValue < ANDROID_SCALER_ROTATE_AND_CROP_NONE ||
             rotateValue > ANDROID_SCALER_ROTATE_AND_CROP_AUTO) return BAD_VALUE;
     Mutex::Autolock lock(mServiceLock);
@@ -5301,7 +5258,7 @@
 
 status_t CameraService::handleSetAutoframing(const Vector<String16>& args) {
     char* end;
-    int autoframingValue = (int) strtol(String8(args[1]), &end, /*base=*/10);
+    int autoframingValue = (int) strtol(toStdString(args[1]).c_str(), &end, /*base=*/10);
     if ((*end != '\0') ||
             (autoframingValue != ANDROID_CONTROL_AUTOFRAMING_OFF &&
              autoframingValue != ANDROID_CONTROL_AUTOFRAMING_ON &&
@@ -5328,7 +5285,7 @@
 }
 
 status_t CameraService::handleSetCameraServiceWatchdog(const Vector<String16>& args) {
-    int enableWatchdog = atoi(String8(args[1]));
+    int enableWatchdog = atoi(toStdString(args[1]).c_str());
 
     if (enableWatchdog < 0 || enableWatchdog > 1) return BAD_VALUE;
 
@@ -5364,11 +5321,11 @@
 status_t CameraService::handleSetImageDumpMask(const Vector<String16>& args) {
     char *endPtr;
     errno = 0;
-    String8 maskString8 = String8(args[1]);
-    long maskValue = strtol(maskString8.c_str(), &endPtr, 10);
+    std::string maskString = toStdString(args[1]);
+    long maskValue = strtol(maskString.c_str(), &endPtr, 10);
 
     if (errno != 0) return BAD_VALUE;
-    if (endPtr != maskString8.c_str() + maskString8.size()) return BAD_VALUE;
+    if (endPtr != maskString.c_str() + maskString.size()) return BAD_VALUE;
     if (maskValue < 0 || maskValue > 1) return BAD_VALUE;
 
     Mutex::Autolock lock(mServiceLock);
@@ -5385,7 +5342,7 @@
 }
 
 status_t CameraService::handleSetCameraMute(const Vector<String16>& args) {
-    int muteValue = strtol(String8(args[1]), nullptr, 10);
+    int muteValue = strtol(toStdString(args[1]).c_str(), nullptr, 10);
     if (errno != 0) return BAD_VALUE;
 
     if (muteValue < 0 || muteValue > 1) return BAD_VALUE;
@@ -5412,23 +5369,23 @@
     std::vector<int64_t> useCasesOverride;
     for (size_t i = 1; i < args.size(); i++) {
         int64_t useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_DEFAULT;
-        String8 arg8 = String8(args[i]);
-        if (arg8 == "DEFAULT") {
+        std::string arg = toStdString(args[i]);
+        if (arg == "DEFAULT") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_DEFAULT;
-        } else if (arg8 == "PREVIEW") {
+        } else if (arg == "PREVIEW") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_PREVIEW;
-        } else if (arg8 == "STILL_CAPTURE") {
+        } else if (arg == "STILL_CAPTURE") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_STILL_CAPTURE;
-        } else if (arg8 == "VIDEO_RECORD") {
+        } else if (arg == "VIDEO_RECORD") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_VIDEO_RECORD;
-        } else if (arg8 == "PREVIEW_VIDEO_STILL") {
+        } else if (arg == "PREVIEW_VIDEO_STILL") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_PREVIEW_VIDEO_STILL;
-        } else if (arg8 == "VIDEO_CALL") {
+        } else if (arg == "VIDEO_CALL") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_VIDEO_CALL;
-        } else if (arg8 == "CROPPED_RAW") {
+        } else if (arg == "CROPPED_RAW") {
             useCase = ANDROID_SCALER_AVAILABLE_STREAM_USE_CASES_CROPPED_RAW;
         } else {
-            ALOGE("%s: Invalid stream use case %s", __FUNCTION__, arg8.c_str());
+            ALOGE("%s: Invalid stream use case %s", __FUNCTION__, arg.c_str());
             return BAD_VALUE;
         }
         useCasesOverride.push_back(useCase);
@@ -5447,7 +5404,7 @@
 
 status_t CameraService::handleSetZoomOverride(const Vector<String16>& args) {
     char* end;
-    int zoomOverrideValue = strtol(String8(args[1]), &end, /*base=*/10);
+    int zoomOverrideValue = strtol(toStdString(args[1]).c_str(), &end, /*base=*/10);
     if ((*end != '\0') ||
             (zoomOverrideValue != -1 &&
              zoomOverrideValue != ANDROID_CONTROL_SETTINGS_OVERRIDE_OFF &&
@@ -5474,15 +5431,15 @@
 }
 
 status_t CameraService::handleWatchCommand(const Vector<String16>& args, int inFd, int outFd) {
-    if (args.size() >= 3 && args[1] == String16("start")) {
+    if (args.size() >= 3 && args[1] == toString16("start")) {
         return startWatchingTags(args, outFd);
-    } else if (args.size() == 2 && args[1] == String16("stop")) {
+    } else if (args.size() == 2 && args[1] == toString16("stop")) {
         return stopWatchingTags(outFd);
-    } else if (args.size() == 2 && args[1] == String16("dump")) {
+    } else if (args.size() == 2 && args[1] == toString16("dump")) {
         return printWatchedTags(outFd);
-    } else if (args.size() >= 2 && args[1] == String16("live")) {
+    } else if (args.size() >= 2 && args[1] == toString16("live")) {
         return printWatchedTagsUntilInterrupt(args, inFd, outFd);
-    } else if (args.size() == 2 && args[1] == String16("clear")) {
+    } else if (args.size() == 2 && args[1] == toString16("clear")) {
         return clearCachedMonitoredTagDumps(outFd);
     }
     dprintf(outFd, "Camera service watch commands:\n"
@@ -5503,7 +5460,7 @@
     Mutex::Autolock lock(mLogLock);
     size_t tagsIdx; // index of '-m'
     String16 tags("");
-    for (tagsIdx = 2; tagsIdx < args.size() && args[tagsIdx] != String16("-m"); tagsIdx++);
+    for (tagsIdx = 2; tagsIdx < args.size() && args[tagsIdx] != toString16("-m"); tagsIdx++);
     if (tagsIdx < args.size() - 1) {
         tags = args[tagsIdx + 1];
     } else {
@@ -5512,16 +5469,17 @@
     }
 
     size_t clientsIdx; // index of '-c'
-    String16 clients = kWatchAllClientsFlag; // watch all clients if no clients are provided
-    for (clientsIdx = 2; clientsIdx < args.size() && args[clientsIdx] != String16("-c");
+    // watch all clients if no clients are provided
+    String16 clients = toString16(kWatchAllClientsFlag);
+    for (clientsIdx = 2; clientsIdx < args.size() && args[clientsIdx] != toString16("-c");
          clientsIdx++);
     if (clientsIdx < args.size() - 1) {
         clients = args[clientsIdx + 1];
     }
-    parseClientsToWatchLocked(String8(clients));
+    parseClientsToWatchLocked(toStdString(clients));
 
     // track tags to initialize future clients with the monitoring information
-    mMonitorTags = String8(tags);
+    mMonitorTags = toStdString(tags);
 
     bool serviceLock = tryLock(mServiceLock);
     int numWatchedClients = 0;
@@ -5545,7 +5503,7 @@
 status_t CameraService::stopWatchingTags(int outFd) {
     // clear mMonitorTags to prevent new clients from monitoring tags at initialization
     Mutex::Autolock lock(mLogLock);
-    mMonitorTags = String8::empty();
+    mMonitorTags = "";
 
     mWatchedClientPackages.clear();
     mWatchedClientsDumpCache.clear();
@@ -5573,7 +5531,7 @@
 
 status_t CameraService::printWatchedTags(int outFd) {
     Mutex::Autolock logLock(mLogLock);
-    std::set<String16> connectedMonitoredClients;
+    std::set<std::string> connectedMonitoredClients;
 
     bool printedSomething = false; // tracks if any monitoring information was printed
                                    // (from either cached or active clients)
@@ -5596,17 +5554,14 @@
         }
 
         // Print tag dumps for active client
-        const String8 &cameraId = clientDescriptor->getKey();
-        String8 packageName8 = String8(client->getPackageName());
-        const char *printablePackageName = packageName8.lockBuffer(packageName8.size());
-        dprintf(outFd, "Client: %s (active)\n", printablePackageName);
+        const std::string &cameraId = clientDescriptor->getKey();
+        dprintf(outFd, "Client: %s (active)\n", client->getPackageName().c_str());
         while(printIdx > 0) {
             printIdx--;
-            dprintf(outFd, "%s:%s  %s", cameraId.string(), printablePackageName,
+            dprintf(outFd, "%s:%s  %s", cameraId.c_str(), client->getPackageName().c_str(),
                     dumpVector[printIdx].c_str());
         }
         dprintf(outFd, "\n");
-        packageName8.unlockBuffer();
         printedSomething = true;
 
         connectedMonitoredClients.emplace(client->getPackageName());
@@ -5615,12 +5570,12 @@
 
     // Print entries in mWatchedClientsDumpCache for clients that are not connected
     for (const auto &kv: mWatchedClientsDumpCache) {
-        const String16 &package = kv.first;
+        const std::string &package = kv.first;
         if (connectedMonitoredClients.find(package) != connectedMonitoredClients.end()) {
             continue;
         }
 
-        dprintf(outFd, "Client: %s (cached)\n", String8(package).string());
+        dprintf(outFd, "Client: %s (cached)\n", package.c_str());
         dprintf(outFd, "%s\n", kv.second.c_str());
         printedSomething = true;
     }
@@ -5634,8 +5589,8 @@
 
 // Print all events in vector `events' that came after lastPrintedEvent
 void printNewWatchedEvents(int outFd,
-                           const char *cameraId,
-                           const String16 &packageName,
+                           const std::string &cameraId,
+                           const std::string &packageName,
                            const std::vector<std::string> &events,
                            const std::string &lastPrintedEvent) {
     if (events.empty()) { return; }
@@ -5649,17 +5604,13 @@
 
     if (lastPrintedIdx == 0) { return; } // early exit if no new event in `events`
 
-    String8 packageName8(packageName);
-    const char *printablePackageName = packageName8.lockBuffer(packageName8.size());
-
     // print events in chronological order (latest event last)
     size_t idxToPrint = lastPrintedIdx;
     do {
         idxToPrint--;
-        dprintf(outFd, "%s:%s  %s", cameraId, printablePackageName, events[idxToPrint].c_str());
+        dprintf(outFd, "%s:%s  %s", cameraId.c_str(), packageName.c_str(),
+                events[idxToPrint].c_str());
     } while (idxToPrint != 0);
-
-    packageName8.unlockBuffer();
 }
 
 // Returns true if adb shell cmd watch should be interrupted based on data in inFd. The watch
@@ -5736,12 +5687,12 @@
     long refreshTimeoutMs = 1000L; // refresh every 1s by default
     if (args.size() > 2) {
         size_t intervalIdx; // index of '-n'
-        for (intervalIdx = 2; intervalIdx < args.size() && String16("-n") != args[intervalIdx];
+        for (intervalIdx = 2; intervalIdx < args.size() && toString16("-n") != args[intervalIdx];
              intervalIdx++);
 
         size_t intervalValIdx = intervalIdx + 1;
         if (intervalValIdx < args.size()) {
-            refreshTimeoutMs = strtol(String8(args[intervalValIdx].string()), nullptr, 10);
+            refreshTimeoutMs = strtol(toStdString(args[intervalValIdx]).c_str(), nullptr, 10);
             if (errno) { return BAD_VALUE; }
         }
     }
@@ -5750,7 +5701,7 @@
     refreshTimeoutMs = refreshTimeoutMs < 10 ? 10 : refreshTimeoutMs;
 
     dprintf(outFd, "Press return to exit...\n\n");
-    std::map<String16, std::string> packageNameToLastEvent;
+    std::map<std::string, std::string> packageNameToLastEvent;
 
     while (true) {
         bool serviceLock = tryLock(mServiceLock);
@@ -5765,7 +5716,7 @@
             if (client.get() == nullptr) { continue; }
             if (!isClientWatchedLocked(client.get())) { continue; }
 
-            const String16 &packageName = client->getPackageName();
+            const std::string &packageName = client->getPackageName();
             // This also initializes the map entries with an empty string
             const std::string& lastPrintedEvent = packageNameToLastEvent[packageName];
 
@@ -5773,15 +5724,12 @@
             client->dumpWatchedEventsToVector(latestEvents);
 
             if (!latestEvents.empty()) {
-                String8 cameraId = clientDescriptor->getKey();
-                const char *printableCameraId = cameraId.lockBuffer(cameraId.size());
                 printNewWatchedEvents(outFd,
-                                      printableCameraId,
+                                      clientDescriptor->getKey(),
                                       packageName,
                                       latestEvents,
                                       lastPrintedEvent);
                 packageNameToLastEvent[packageName] = latestEvents[0];
-                cameraId.unlockBuffer();
             }
         }
         if (shouldInterruptWatchCommand(inFd, outFd, refreshTimeoutMs)) {
@@ -5791,17 +5739,14 @@
     return OK;
 }
 
-void CameraService::parseClientsToWatchLocked(String8 clients) {
+void CameraService::parseClientsToWatchLocked(const std::string &clients) {
     mWatchedClientPackages.clear();
 
-    const char *allSentinel = String8(kWatchAllClientsFlag).string();
+    std::istringstream iss(clients);
+    std::string nextClient;
 
-    char *tokenized = clients.lockBuffer(clients.size());
-    char *savePtr;
-    char *nextClient = strtok_r(tokenized, ",", &savePtr);
-
-    while (nextClient != nullptr) {
-        if (strcmp(nextClient, allSentinel) == 0) {
+    while (std::getline(iss, nextClient, ',')) {
+        if (nextClient == kWatchAllClientsFlag) {
             // Don't need to track any other package if 'all' is present
             mWatchedClientPackages.clear();
             mWatchedClientPackages.emplace(kWatchAllClientsFlag);
@@ -5810,9 +5755,7 @@
 
         // track package names
         mWatchedClientPackages.emplace(nextClient);
-        nextClient = strtok_r(nullptr, ",", &savePtr);
     }
-    clients.unlockBuffer();
 }
 
 status_t CameraService::printHelp(int out) {
@@ -5876,13 +5819,13 @@
     return mode;
 }
 
-status_t CameraService::checkIfInjectionCameraIsPresent(const String8& externalCamId,
+status_t CameraService::checkIfInjectionCameraIsPresent(const std::string& externalCamId,
         sp<BasicClient> clientSp) {
     std::unique_ptr<AutoConditionLock> lock =
             AutoConditionLock::waitAndAcquire(mServiceLockWrapper);
     status_t res = NO_ERROR;
     if ((res = checkIfDeviceIsUsable(externalCamId)) != NO_ERROR) {
-        ALOGW("Device %s is not usable!", externalCamId.string());
+        ALOGW("Device %s is not usable!", externalCamId.c_str());
         mInjectionStatusListener->notifyInjectionError(
                 externalCamId, UNKNOWN_TRANSACTION);
         clientSp->notifyError(
diff --git a/services/camera/libcameraservice/CameraService.h b/services/camera/libcameraservice/CameraService.h
index 3214d4c..bc65293 100644
--- a/services/camera/libcameraservice/CameraService.h
+++ b/services/camera/libcameraservice/CameraService.h
@@ -119,19 +119,19 @@
     /////////////////////////////////////////////////////////////////////
     // HAL Callbacks - implements CameraProviderManager::StatusListener
 
-    virtual void        onDeviceStatusChanged(const String8 &cameraId,
+    virtual void        onDeviceStatusChanged(const std::string &cameraId,
             CameraDeviceStatus newHalStatus) override;
-    virtual void        onDeviceStatusChanged(const String8 &cameraId,
-            const String8 &physicalCameraId,
+    virtual void        onDeviceStatusChanged(const std::string &cameraId,
+            const std::string &physicalCameraId,
             CameraDeviceStatus newHalStatus) override;
     // This method may hold CameraProviderManager::mInterfaceMutex as a part
     // of calling getSystemCameraKind() internally. Care should be taken not to
     // directly / indirectly call this from callers who also hold
     // mInterfaceMutex.
-    virtual void        onTorchStatusChanged(const String8& cameraId,
+    virtual void        onTorchStatusChanged(const std::string& cameraId,
             TorchModeStatus newStatus) override;
     // Does not hold CameraProviderManager::mInterfaceMutex.
-    virtual void        onTorchStatusChanged(const String8& cameraId,
+    virtual void        onTorchStatusChanged(const std::string& cameraId,
             TorchModeStatus newStatus,
             SystemCameraKind kind) override;
     virtual void        onNewProviderRegistered() override;
@@ -142,7 +142,7 @@
 
     virtual binder::Status     getCameraInfo(int cameraId, bool overrideToPortrait,
             hardware::CameraInfo* cameraInfo) override;
-    virtual binder::Status     getCameraCharacteristics(const String16& cameraId,
+    virtual binder::Status     getCameraCharacteristics(const std::string& cameraId,
             int targetSdkVersion, bool overrideToPortrait, CameraMetadata* cameraInfo) override;
     virtual binder::Status     getCameraVendorTagDescriptor(
             /*out*/
@@ -152,15 +152,16 @@
             hardware::camera2::params::VendorTagDescriptorCache* cache);
 
     virtual binder::Status     connect(const sp<hardware::ICameraClient>& cameraClient,
-            int32_t cameraId, const String16& clientPackageName,
+            int32_t cameraId, const std::string& clientPackageName,
             int32_t clientUid, int clientPid, int targetSdkVersion,
             bool overrideToPortrait, bool forceSlowJpegMode,
             /*out*/
             sp<hardware::ICamera>* device) override;
 
     virtual binder::Status     connectDevice(
-            const sp<hardware::camera2::ICameraDeviceCallbacks>& cameraCb, const String16& cameraId,
-            const String16& clientPackageName, const std::optional<String16>& clientFeatureId,
+            const sp<hardware::camera2::ICameraDeviceCallbacks>& cameraCb,
+            const std::string& cameraId,
+            const std::string& clientPackageName, const std::optional<std::string>& clientFeatureId,
             int32_t clientUid, int scoreOffset, int targetSdkVersion, bool overrideToPortrait,
             /*out*/
             sp<hardware::camera2::ICameraDeviceUser>* device);
@@ -182,15 +183,15 @@
     virtual binder::Status    getLegacyParameters(
             int32_t cameraId,
             /*out*/
-            String16* parameters);
+            std::string* parameters);
 
-    virtual binder::Status    setTorchMode(const String16& cameraId, bool enabled,
+    virtual binder::Status    setTorchMode(const std::string& cameraId, bool enabled,
             const sp<IBinder>& clientBinder);
 
-    virtual binder::Status    turnOnTorchWithStrengthLevel(const String16& cameraId,
+    virtual binder::Status    turnOnTorchWithStrengthLevel(const std::string& cameraId,
             int32_t torchStrength, const sp<IBinder>& clientBinder);
 
-    virtual binder::Status    getTorchStrengthLevel(const String16& cameraId,
+    virtual binder::Status    getTorchStrengthLevel(const std::string& cameraId,
             int32_t* torchStrength);
 
     virtual binder::Status    notifySystemEvent(int32_t eventId,
@@ -202,24 +203,24 @@
 
     // OK = supports api of that version, -EOPNOTSUPP = does not support
     virtual binder::Status    supportsCameraApi(
-            const String16& cameraId, int32_t apiVersion,
+            const std::string& cameraId, int32_t apiVersion,
             /*out*/
             bool *isSupported);
 
     virtual binder::Status    isHiddenPhysicalCamera(
-            const String16& cameraId,
+            const std::string& cameraId,
             /*out*/
             bool *isSupported);
 
     virtual binder::Status injectCamera(
-            const String16& packageName, const String16& internalCamId,
-            const String16& externalCamId,
+            const std::string& packageName, const std::string& internalCamId,
+            const std::string& externalCamId,
             const sp<hardware::camera2::ICameraInjectionCallback>& callback,
             /*out*/
             sp<hardware::camera2::ICameraInjectionSession>* cameraInjectionSession);
 
     virtual binder::Status reportExtensionSessionStats(
-            const hardware::CameraExtensionSessionStats& stats, String16* sessionKey /*out*/);
+            const hardware::CameraExtensionSessionStats& stats, std::string* sessionKey /*out*/);
 
     // Extra permissions checks
     virtual status_t    onTransact(uint32_t code, const Parcel& data,
@@ -242,7 +243,7 @@
     void cacheDump();
 
     // Register an offline client for a given active camera id
-    status_t addOfflineClient(String8 cameraId, sp<BasicClient> offlineClient);
+    status_t addOfflineClient(const std::string &cameraId, sp<BasicClient> offlineClient);
 
     /////////////////////////////////////////////////////////////////////
     // Client functionality
@@ -261,7 +262,7 @@
 
     /////////////////////////////////////////////////////////////////////
     // CameraDeviceFactory functionality
-    std::pair<int, IPCTransport>    getDeviceVersion(const String8& cameraId,
+    std::pair<int, IPCTransport>    getDeviceVersion(const std::string& cameraId,
             bool overrideToPortrait, int* portraitRotation,
             int* facing = nullptr, int* orientation = nullptr);
 
@@ -289,7 +290,7 @@
     friend class CameraService;
     public:
         virtual status_t       initialize(sp<CameraProviderManager> manager,
-                const String8& monitorTags) = 0;
+                const std::string& monitorTags) = 0;
         virtual binder::Status disconnect();
 
         // because we can't virtually inherit IInterface, which breaks
@@ -310,12 +311,12 @@
         // Internal dump method to be called by CameraService
         virtual status_t dumpClient(int fd, const Vector<String16>& args) = 0;
 
-        virtual status_t startWatchingTags(const String8 &tags, int outFd);
+        virtual status_t startWatchingTags(const std::string &tags, int outFd);
         virtual status_t stopWatchingTags(int outFd);
         virtual status_t dumpWatchedEventsToVector(std::vector<std::string> &out);
 
         // Return the package name for this client
-        virtual String16 getPackageName() const;
+        virtual std::string getPackageName() const;
 
         // Return the camera facing for this client
         virtual int getCameraFacing() const;
@@ -383,7 +384,7 @@
 
         // The injection camera session to replace the internal camera
         // session.
-        virtual status_t injectCamera(const String8& injectedCamId,
+        virtual status_t injectCamera(const std::string& injectedCamId,
                 sp<CameraProviderManager> manager) = 0;
 
         // Stop the injection camera and restore to internal camera session.
@@ -392,10 +393,10 @@
     protected:
         BasicClient(const sp<CameraService>& cameraService,
                 const sp<IBinder>& remoteCallback,
-                const String16& clientPackageName,
+                const std::string& clientPackageName,
                 bool nativeClient,
-                const std::optional<String16>& clientFeatureId,
-                const String8& cameraIdStr,
+                const std::optional<std::string>& clientFeatureId,
+                const std::string& cameraIdStr,
                 int cameraFacing,
                 int sensorOrientation,
                 int clientPid,
@@ -413,12 +414,12 @@
 
         // these are initialized in the constructor.
         static sp<CameraService>        sCameraService;
-        const String8                   mCameraIdStr;
+        const std::string               mCameraIdStr;
         const int                       mCameraFacing;
         const int                       mOrientation;
-        String16                        mClientPackageName;
+        std::string                     mClientPackageName;
         bool                            mSystemNativeClient;
-        std::optional<String16>         mClientFeatureId;
+        std::optional<std::string>      mClientFeatureId;
         pid_t                           mClientPid;
         const uid_t                     mClientUid;
         const pid_t                     mServicePid;
@@ -505,10 +506,10 @@
         // Interface used by CameraService
         Client(const sp<CameraService>& cameraService,
                 const sp<hardware::ICameraClient>& cameraClient,
-                const String16& clientPackageName,
+                const std::string& clientPackageName,
                 bool systemNativeClient,
-                const std::optional<String16>& clientFeatureId,
-                const String8& cameraIdStr,
+                const std::optional<std::string>& clientFeatureId,
+                const std::string& cameraIdStr,
                 int api1CameraId,
                 int cameraFacing,
                 int sensorOrientation,
@@ -552,13 +553,13 @@
      */
     class ClientEventListener {
     public:
-        void onClientAdded(const resource_policy::ClientDescriptor<String8,
+        void onClientAdded(const resource_policy::ClientDescriptor<std::string,
                 sp<CameraService::BasicClient>>& descriptor);
-        void onClientRemoved(const resource_policy::ClientDescriptor<String8,
+        void onClientRemoved(const resource_policy::ClientDescriptor<std::string,
                 sp<CameraService::BasicClient>>& descriptor);
     }; // class ClientEventListener
 
-    typedef std::shared_ptr<resource_policy::ClientDescriptor<String8,
+    typedef std::shared_ptr<resource_policy::ClientDescriptor<std::string,
             sp<CameraService::BasicClient>>> DescriptorPtr;
 
     /**
@@ -569,7 +570,7 @@
      * This class manages the eviction behavior for the camera clients.  See the parent class
      * implementation in utils/ClientManager for the specifics of this behavior.
      */
-    class CameraClientManager : public resource_policy::ClientManager<String8,
+    class CameraClientManager : public resource_policy::ClientManager<std::string,
             sp<CameraService::BasicClient>, ClientEventListener> {
     public:
         CameraClientManager();
@@ -579,18 +580,19 @@
          * Return a strong pointer to the active BasicClient for this camera ID, or an empty
          * if none exists.
          */
-        sp<CameraService::BasicClient> getCameraClient(const String8& id) const;
+        sp<CameraService::BasicClient> getCameraClient(const std::string& id) const;
 
         /**
          * Return a string describing the current state.
          */
-        String8 toString() const;
+        std::string toString() const;
 
         /**
          * Make a ClientDescriptor object wrapping the given BasicClient strong pointer.
          */
-        static DescriptorPtr makeClientDescriptor(const String8& key, const sp<BasicClient>& value,
-                int32_t cost, const std::set<String8>& conflictingKeys, int32_t score,
+        static DescriptorPtr makeClientDescriptor(const std::string& key,
+                const sp<BasicClient>& value, int32_t cost,
+                const std::set<std::string>& conflictingKeys, int32_t score,
                 int32_t ownerId, int32_t state, int oomScoreOffset, bool systemNativeClient);
 
         /**
@@ -650,7 +652,7 @@
          * Make a new CameraState and set the ID, cost, and conflicting devices using the values
          * returned in the HAL's camera_info struct for each device.
          */
-        CameraState(const String8& id, int cost, const std::set<String8>& conflicting,
+        CameraState(const std::string& id, int cost, const std::set<std::string>& conflicting,
                 SystemCameraKind deviceKind, const std::vector<std::string>& physicalCameras);
         virtual ~CameraState();
 
@@ -664,7 +666,7 @@
         /**
          * This function updates the status for this camera device, unless the given status
          * is in the given list of rejected status states, and execute the function passed in
-         * with a signature onStatusUpdateLocked(const String8&, int32_t)
+         * with a signature onStatusUpdateLocked(const std::string&, int32_t)
          * if the status has changed.
          *
          * This method is idempotent, and will not result in the function passed to
@@ -673,7 +675,7 @@
          */
         template<class Func>
         void updateStatus(StatusInternal status,
-                const String8& cameraId,
+                const std::string& cameraId,
                 std::initializer_list<StatusInternal> rejectSourceStates,
                 Func onStatusUpdatedLocked);
 
@@ -696,12 +698,7 @@
         /**
          * Return a set of the IDs of conflicting devices advertised by the HAL for this device.
          */
-        std::set<String8> getConflicting() const;
-
-        /**
-         * Return the ID of this camera device.
-         */
-        String8 getId() const;
+        std::set<std::string> getConflicting() const;
 
         /**
          * Return the kind (SystemCameraKind) of this camera device.
@@ -717,28 +714,28 @@
         /**
          * Add/Remove the unavailable physical camera ID.
          */
-        bool addUnavailablePhysicalId(const String8& physicalId);
-        bool removeUnavailablePhysicalId(const String8& physicalId);
+        bool addUnavailablePhysicalId(const std::string& physicalId);
+        bool removeUnavailablePhysicalId(const std::string& physicalId);
 
         /**
          * Set and get client package name.
          */
-        void setClientPackage(const String8& clientPackage);
-        String8 getClientPackage() const;
+        void setClientPackage(const std::string& clientPackage);
+        std::string getClientPackage() const;
 
         /**
          * Return the unavailable physical ids for this device.
          *
          * This method acquires mStatusLock.
          */
-        std::vector<String8> getUnavailablePhysicalIds() const;
+        std::vector<std::string> getUnavailablePhysicalIds() const;
     private:
-        const String8 mId;
+        const std::string mId;
         StatusInternal mStatus; // protected by mStatusLock
         const int mCost;
-        std::set<String8> mConflicting;
-        std::set<String8> mUnavailablePhysicalIds;
-        String8 mClientPackage;
+        std::set<std::string> mConflicting;
+        std::set<std::string> mUnavailablePhysicalIds;
+        std::string mClientPackage;
         mutable Mutex mStatusLock;
         CameraParameters mShimParams;
         const SystemCameraKind mSystemCameraKind;
@@ -758,7 +755,7 @@
         void registerSelf();
         void unregisterSelf();
 
-        bool isUidActive(uid_t uid, String16 callingPackage);
+        bool isUidActive(uid_t uid, const std::string &callingPackage);
         int32_t getProcState(uid_t uid);
 
         // IUidObserver
@@ -769,8 +766,8 @@
                 int32_t capability) override;
         void onUidProcAdjChanged(uid_t uid, int adj) override;
 
-        void addOverrideUid(uid_t uid, String16 callingPackage, bool active);
-        void removeOverrideUid(uid_t uid, String16 callingPackage);
+        void addOverrideUid(uid_t uid, const std::string &callingPackage, bool active);
+        void removeOverrideUid(uid_t uid, const std::string &callingPackage);
 
         void registerMonitorUid(uid_t uid, bool openCamera);
         void unregisterMonitorUid(uid_t uid, bool closeCamera);
@@ -781,9 +778,10 @@
         // IBinder::DeathRecipient implementation
         virtual void binderDied(const wp<IBinder> &who);
     private:
-        bool isUidActiveLocked(uid_t uid, String16 callingPackage);
+        bool isUidActiveLocked(uid_t uid, const std::string &callingPackage);
         int32_t getProcStateLocked(uid_t uid);
-        void updateOverrideUid(uid_t uid, String16 callingPackage, bool active, bool insert);
+        void updateOverrideUid(uid_t uid, const std::string &callingPackage, bool active,
+                bool insert);
         void registerWithActivityManager();
 
         struct MonitoredUid {
@@ -853,8 +851,8 @@
 
     // Add/remove a new camera to camera and torch state lists or remove an unplugged one
     // Caller must not hold mServiceLock
-    void addStates(const String8 id);
-    void removeStates(const String8 id);
+    void addStates(const std::string& id);
+    void removeStates(const std::string& id);
 
     // Check if we can connect, before we acquire the service lock.
     // The returned originalClientPid is the PID of the original process that wants to connect to
@@ -863,24 +861,25 @@
     // originalClientPid and clientPid are usually the same except when the application uses
     // mediaserver to connect to camera (using MediaRecorder to connect to camera). In that case,
     // clientPid is the PID of mediaserver and originalClientPid is the PID of the application.
-    binder::Status validateConnectLocked(const String8& cameraId, const String8& clientName8,
+    binder::Status validateConnectLocked(const std::string& cameraId, const std::string& clientName,
             /*inout*/int& clientUid, /*inout*/int& clientPid, /*out*/int& originalClientPid) const;
-    binder::Status validateClientPermissionsLocked(const String8& cameraId, const String8& clientName8,
-            /*inout*/int& clientUid, /*inout*/int& clientPid, /*out*/int& originalClientPid) const;
+    binder::Status validateClientPermissionsLocked(const std::string& cameraId,
+            const std::string& clientName, /*inout*/int& clientUid, /*inout*/int& clientPid,
+            /*out*/int& originalClientPid) const;
 
     // Handle active client evictions, and update service state.
     // Only call with with mServiceLock held.
-    status_t handleEvictionsLocked(const String8& cameraId, int clientPid,
-        apiLevel effectiveApiLevel, const sp<IBinder>& remoteCallback, const String8& packageName,
-        int scoreOffset, bool systemNativeClient,
+    status_t handleEvictionsLocked(const std::string& cameraId, int clientPid,
+        apiLevel effectiveApiLevel, const sp<IBinder>& remoteCallback,
+        const std::string& packageName, int scoreOffset, bool systemNativeClient,
         /*out*/
         sp<BasicClient>* client,
-        std::shared_ptr<resource_policy::ClientDescriptor<String8, sp<BasicClient>>>* partial);
+        std::shared_ptr<resource_policy::ClientDescriptor<std::string, sp<BasicClient>>>* partial);
 
     // Should an operation attempt on a cameraId be rejected ? (this can happen
     // under various conditions. For example if a camera device is advertised as
     // system only or hidden secure camera, amongst possible others.
-    bool shouldRejectSystemCameraConnection(const String8 & cameraId) const;
+    bool shouldRejectSystemCameraConnection(const std::string& cameraId) const;
 
     // Should a device status update be skipped for a particular camera device ? (this can happen
     // under various conditions. For example if a camera device is advertised as
@@ -892,7 +891,7 @@
     // getSystemCameraKind() needs mInterfaceMutex which might lead to deadlocks
     // if held along with mStatusListenerLock (depending on lock ordering, b/141756275), it is
     // recommended that we don't call this function with mStatusListenerLock held.
-    status_t getSystemCameraKind(const String8& cameraId, SystemCameraKind *kind) const;
+    status_t getSystemCameraKind(const std::string& cameraId, SystemCameraKind *kind) const;
 
     // Update the set of API1Compatible camera devices without including system
     // cameras and secure cameras. This is used for hiding system only cameras
@@ -908,13 +907,13 @@
     // as for legacy apps we will toggle the app op for all packages in the UID.
     // The caveat is that the operation may be attributed to the wrong package and
     // stats based on app ops may be slightly off.
-    String16 getPackageNameFromUid(int clientUid);
+    std::string getPackageNameFromUid(int clientUid);
 
     // Single implementation shared between the various connect calls
     template<class CALLBACK, class CLIENT>
-    binder::Status connectHelper(const sp<CALLBACK>& cameraCb, const String8& cameraId,
-            int api1CameraId, const String16& clientPackageNameMaybe, bool systemNativeClient,
-            const std::optional<String16>& clientFeatureId, int clientUid, int clientPid,
+    binder::Status connectHelper(const sp<CALLBACK>& cameraCb, const std::string& cameraId,
+            int api1CameraId, const std::string& clientPackageNameMaybe, bool systemNativeClient,
+            const std::optional<std::string>& clientFeatureId, int clientUid, int clientPid,
             apiLevel effectiveApiLevel, bool shimUpdateOnly, int scoreOffset, int targetSdkVersion,
             bool overrideToPortrait, bool forceSlowJpegMode,
             /*out*/sp<CLIENT>& device);
@@ -926,37 +925,38 @@
     std::shared_ptr<WaitableMutexWrapper> mServiceLockWrapper;
 
     // Return NO_ERROR if the device with a give ID can be connected to
-    status_t checkIfDeviceIsUsable(const String8& cameraId) const;
+    status_t checkIfDeviceIsUsable(const std::string& cameraId) const;
 
     // Container for managing currently active application-layer clients
     CameraClientManager mActiveClientManager;
 
     // Adds client logs during open session to the file pointed by fd.
-    void dumpOpenSessionClientLogs(int fd, const Vector<String16>& args, const String8& cameraId);
+    void dumpOpenSessionClientLogs(int fd, const Vector<String16>& args,
+            const std::string& cameraId);
 
     // Adds client logs during closed session to the file pointed by fd.
-    void dumpClosedSessionClientLogs(int fd, const String8& cameraId);
+    void dumpClosedSessionClientLogs(int fd, const std::string& cameraId);
 
     // Mapping from camera ID -> state for each device, map is protected by mCameraStatesLock
-    std::map<String8, std::shared_ptr<CameraState>> mCameraStates;
+    std::map<std::string, std::shared_ptr<CameraState>> mCameraStates;
 
     // Mutex guarding mCameraStates map
     mutable Mutex mCameraStatesLock;
 
     // Circular buffer for storing event logging for dumps
-    RingBuffer<String8> mEventLog;
+    RingBuffer<std::string> mEventLog;
     Mutex mLogLock;
 
     // set of client package names to watch. if this set contains 'all', then all clients will
     // be watched. Access should be guarded by mLogLock
-    std::set<String16> mWatchedClientPackages;
+    std::set<std::string> mWatchedClientPackages;
     // cache of last monitored tags dump immediately before the client disconnects. If a client
     // re-connects, its entry is not updated until it disconnects again. Access should be guarded
     // by mLogLock
-    std::map<String16, std::string> mWatchedClientsDumpCache;
+    std::map<std::string, std::string> mWatchedClientsDumpCache;
 
     // The last monitored tags set by client
-    String8 mMonitorTags;
+    std::string mMonitorTags;
 
     // Currently allowed user IDs
     std::set<userid_t> mAllowedUsers;
@@ -966,7 +966,7 @@
      *
      * This acquires mCameraStatesLock.
      */
-    std::shared_ptr<CameraService::CameraState> getCameraState(const String8& cameraId) const;
+    std::shared_ptr<CameraService::CameraState> getCameraState(const std::string& cameraId) const;
 
     /**
      * Evict client who's remote binder has died.  Returns true if this client was in the active
@@ -997,7 +997,7 @@
      * Returns the underlying camera Id string mapped to a camera id int
      * Empty string is returned when the cameraIdInt is invalid.
      */
-    String8 cameraIdIntToStr(int cameraIdInt);
+    std::string cameraIdIntToStr(int cameraIdInt);
 
     /**
      * Returns the underlying camera Id string mapped to a camera id int
@@ -1011,7 +1011,7 @@
      *
      * This method must be called with mServiceLock held.
      */
-    sp<CameraService::BasicClient> removeClientLocked(const String8& cameraId);
+    sp<CameraService::BasicClient> removeClientLocked(const std::string& cameraId);
 
     /**
      * Handle a notification that the current device user has changed.
@@ -1021,39 +1021,41 @@
     /**
      * Add an event log message.
      */
-    void logEvent(const char* event);
+    void logEvent(const std::string &event);
 
     /**
      * Add an event log message that a client has been disconnected.
      */
-    void logDisconnected(const char* cameraId, int clientPid, const char* clientPackage);
+    void logDisconnected(const std::string &cameraId, int clientPid,
+            const std::string &clientPackage);
 
     /**
      * Add an event log message that a client has been disconnected from offline device.
      */
-    void logDisconnectedOffline(const char* cameraId, int clientPid, const char* clientPackage);
+    void logDisconnectedOffline(const std::string &cameraId, int clientPid,
+            const std::string &clientPackage);
 
     /**
      * Add an event log message that an offline client has been connected.
      */
-    void logConnectedOffline(const char* cameraId, int clientPid,
-            const char* clientPackage);
+    void logConnectedOffline(const std::string &cameraId, int clientPid,
+            const std::string &clientPackage);
 
     /**
      * Add an event log message that a client has been connected.
      */
-    void logConnected(const char* cameraId, int clientPid, const char* clientPackage);
+    void logConnected(const std::string &cameraId, int clientPid, const std::string &clientPackage);
 
     /**
      * Add an event log message that a client's connect attempt has been rejected.
      */
-    void logRejected(const char* cameraId, int clientPid, const char* clientPackage,
-            const char* reason);
+    void logRejected(const std::string &cameraId, int clientPid, const std::string &clientPackage,
+            const std::string &reason);
 
     /**
      * Add an event log message when a client calls setTorchMode succesfully.
      */
-    void logTorchEvent(const char* cameraId, const char *torchState, int clientPid);
+    void logTorchEvent(const std::string &cameraId, const std::string &torchState, int clientPid);
 
     /**
      * Add an event log message that the current device user has been switched.
@@ -1064,30 +1066,30 @@
     /**
      * Add an event log message that a device has been removed by the HAL
      */
-    void logDeviceRemoved(const char* cameraId, const char* reason);
+    void logDeviceRemoved(const std::string &cameraId, const std::string &reason);
 
     /**
      * Add an event log message that a device has been added by the HAL
      */
-    void logDeviceAdded(const char* cameraId, const char* reason);
+    void logDeviceAdded(const std::string &cameraId, const std::string &reason);
 
     /**
      * Add an event log message that a client has unexpectedly died.
      */
-    void logClientDied(int clientPid, const char* reason);
+    void logClientDied(int clientPid, const std::string &reason);
 
     /**
      * Add a event log message that a serious service-level error has occured
      * The errorCode should be one of the Android Errors
      */
-    void logServiceError(const char* msg, int errorCode);
+    void logServiceError(const std::string &msg, int errorCode);
 
     /**
      * Dump the event log to an FD
      */
     void dumpEventLog(int fd);
 
-    void cacheClientTagDumpIfNeeded(const char *cameraId, BasicClient *client);
+    void cacheClientTagDumpIfNeeded(const std::string &cameraId, BasicClient *client);
 
     /**
      * This method will acquire mServiceLock
@@ -1203,18 +1205,19 @@
      * This method acquires mStatusLock and mStatusListenerLock.
      */
     void updateStatus(StatusInternal status,
-            const String8& cameraId,
+            const std::string& cameraId,
             std::initializer_list<StatusInternal>
                 rejectedSourceStates);
     void updateStatus(StatusInternal status,
-            const String8& cameraId);
+            const std::string& cameraId);
 
     /**
      * Update the opened/closed status of the given camera id.
      *
      * This method acqiures mStatusListenerLock.
      */
-    void updateOpenCloseStatus(const String8& cameraId, bool open, const String16& packageName);
+    void updateOpenCloseStatus(const std::string& cameraId, bool open,
+            const std::string& packageName);
 
     // flashlight control
     sp<CameraFlashlight> mFlashlight;
@@ -1225,38 +1228,38 @@
     // guard mTorchUidMap
     Mutex                mTorchUidMapMutex;
     // camera id -> torch status
-    KeyedVector<String8, TorchModeStatus>
+    KeyedVector<std::string, TorchModeStatus>
             mTorchStatusMap;
     // camera id -> torch client binder
     // only store the last client that turns on each camera's torch mode
-    KeyedVector<String8, sp<IBinder>> mTorchClientMap;
+    KeyedVector<std::string, sp<IBinder>> mTorchClientMap;
     // camera id -> [incoming uid, current uid] pair
-    std::map<String8, std::pair<int, int>> mTorchUidMap;
+    std::map<std::string, std::pair<int, int>> mTorchUidMap;
 
     // check and handle if torch client's process has died
     void handleTorchClientBinderDied(const wp<IBinder> &who);
 
     // handle torch mode status change and invoke callbacks. mTorchStatusMutex
     // should be locked.
-    void onTorchStatusChangedLocked(const String8& cameraId,
+    void onTorchStatusChangedLocked(const std::string& cameraId,
             TorchModeStatus newStatus,
             SystemCameraKind systemCameraKind);
 
     // get a camera's torch status. mTorchStatusMutex should be locked.
-    status_t getTorchStatusLocked(const String8 &cameraId,
+    status_t getTorchStatusLocked(const std::string &cameraId,
              TorchModeStatus *status) const;
 
     // set a camera's torch status. mTorchStatusMutex should be locked.
-    status_t setTorchStatusLocked(const String8 &cameraId,
+    status_t setTorchStatusLocked(const std::string &cameraId,
             TorchModeStatus status);
 
     // notify physical camera status when the physical camera is public.
     // Expects mStatusListenerLock to be locked.
-    void notifyPhysicalCameraStatusLocked(int32_t status, const String16& physicalCameraId,
-            const std::list<String16>& logicalCameraIds, SystemCameraKind deviceKind);
+    void notifyPhysicalCameraStatusLocked(int32_t status, const std::string& physicalCameraId,
+            const std::list<std::string>& logicalCameraIds, SystemCameraKind deviceKind);
 
     // get list of logical cameras which are backed by physicalCameraId
-    std::list<String16> getLogicalCameras(const String8& physicalCameraId);
+    std::list<std::string> getLogicalCameras(const std::string& physicalCameraId);
 
 
     // IBinder::DeathRecipient implementation
@@ -1348,7 +1351,7 @@
     // Parses comma separated clients list and adds them to mWatchedClientPackages.
     // Does not acquire mLogLock before modifying mWatchedClientPackages. It is the caller's
     // responsibility to acquire mLogLock before calling this function.
-    void parseClientsToWatchLocked(String8 clients);
+    void parseClientsToWatchLocked(const std::string &clients);
 
     // Prints the shell command help
     status_t printHelp(int out);
@@ -1365,39 +1368,37 @@
     /**
      * Get the current system time as a formatted string.
      */
-    static String8 getFormattedCurrentTime();
+    static std::string getFormattedCurrentTime();
 
     static binder::Status makeClient(const sp<CameraService>& cameraService,
-            const sp<IInterface>& cameraCb, const String16& packageName,
-            bool systemNativeClient, const std::optional<String16>& featureId,
-            const String8& cameraId, int api1CameraId, int facing, int sensorOrientation,
+            const sp<IInterface>& cameraCb, const std::string& packageName,
+            bool systemNativeClient, const std::optional<std::string>& featureId,
+            const std::string& cameraId, int api1CameraId, int facing, int sensorOrientation,
             int clientPid, uid_t clientUid, int servicePid,
             std::pair<int, IPCTransport> deviceVersionAndIPCTransport, apiLevel effectiveApiLevel,
             bool overrideForPerfClass, bool overrideToPortrait, bool forceSlowJpegMode,
             /*out*/sp<BasicClient>* client);
 
-    status_t checkCameraAccess(const String16& opPackageName);
-
-    static String8 toString(std::set<userid_t> intSet);
+    static std::string toString(std::set<userid_t> intSet);
     static int32_t mapToInterface(TorchModeStatus status);
     static StatusInternal mapToInternal(CameraDeviceStatus status);
     static int32_t mapToInterface(StatusInternal status);
 
 
-    void broadcastTorchModeStatus(const String8& cameraId,
+    void broadcastTorchModeStatus(const std::string& cameraId,
             TorchModeStatus status, SystemCameraKind systemCameraKind);
 
-    void broadcastTorchStrengthLevel(const String8& cameraId, int32_t newTorchStrengthLevel);
+    void broadcastTorchStrengthLevel(const std::string& cameraId, int32_t newTorchStrengthLevel);
 
-    void disconnectClient(const String8& id, sp<BasicClient> clientToDisconnect);
+    void disconnectClient(const std::string& id, sp<BasicClient> clientToDisconnect);
 
     // Regular online and offline devices must not be in conflict at camera service layer.
     // Use separate keys for offline devices.
-    static const String8 kOfflineDevice;
+    static const std::string kOfflineDevice;
 
     // Sentinel value to be stored in `mWatchedClientsPackages` to indicate that all clients should
     // be watched.
-    static const String16 kWatchAllClientsFlag;
+    static const std::string kWatchAllClientsFlag;
 
     // TODO: right now each BasicClient holds one AppOpsManager instance.
     // We can refactor the code so all of clients share this instance
@@ -1438,7 +1439,7 @@
 
             void addListener(const sp<hardware::camera2::ICameraInjectionCallback>& callback);
             void removeListener();
-            void notifyInjectionError(String8 injectedCamId, status_t err);
+            void notifyInjectionError(const std::string &injectedCamId, status_t err);
 
             // IBinder::DeathRecipient implementation
             virtual void binderDied(const wp<IBinder>& who);
@@ -1467,15 +1468,15 @@
 
     // When injecting the camera, it will check whether the injecting camera status is unavailable.
     // If it is, the disconnect function will be called to to prevent camera access on the device.
-    status_t checkIfInjectionCameraIsPresent(const String8& externalCamId,
+    status_t checkIfInjectionCameraIsPresent(const std::string& externalCamId,
             sp<BasicClient> clientSp);
 
     void clearInjectionParameters();
 
     // This is the existing camera id being replaced.
-    String8 mInjectionInternalCamId;
+    std::string mInjectionInternalCamId;
     // This is the external camera Id replacing the internalId.
-    String8 mInjectionExternalCamId;
+    std::string mInjectionExternalCamId;
     bool mInjectionInitPending = false;
     // Guard mInjectionInternalCamId and mInjectionInitPending.
     Mutex mInjectionParametersLock;
@@ -1483,7 +1484,7 @@
     // Track the folded/unfoled device state. 0 == UNFOLDED, 4 == FOLDED
     int64_t mDeviceState;
 
-    void updateTorchUidMapLocked(const String16& cameraId, int uid);
+    void updateTorchUidMapLocked(const std::string& cameraId, int uid);
 };
 
 } // namespace android
diff --git a/services/camera/libcameraservice/CameraServiceWatchdog.h b/services/camera/libcameraservice/CameraServiceWatchdog.h
index de6ac9e..9f25865 100644
--- a/services/camera/libcameraservice/CameraServiceWatchdog.h
+++ b/services/camera/libcameraservice/CameraServiceWatchdog.h
@@ -32,7 +32,6 @@
 #include <chrono>
 #include <thread>
 #include <time.h>
-#include <utils/String8.h>
 #include <utils/Thread.h>
 #include <utils/Log.h>
 #include <unordered_map>
@@ -58,13 +57,13 @@
 };
 
 public:
-    explicit CameraServiceWatchdog(const String8 &cameraId,
+    explicit CameraServiceWatchdog(const std::string &cameraId,
             std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper) :
                     mCameraId(cameraId), mPause(true), mMaxCycles(kMaxCycles),
                     mCycleLengthMs(kCycleLengthMs), mEnabled(true),
                     mCameraServiceProxyWrapper(cameraServiceProxyWrapper) {};
 
-    explicit CameraServiceWatchdog (const String8 &cameraId, size_t maxCycles,
+    explicit CameraServiceWatchdog (const std::string &cameraId, size_t maxCycles,
             uint32_t cycleLengthMs, bool enabled,
             std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper) :
                     mCameraId(cameraId), mPause(true), mMaxCycles(maxCycles),
@@ -151,7 +150,7 @@
     Mutex           mWatchdogLock;      // Lock for condition variable
     Mutex           mEnabledLock;       // Lock for enabled status
     Condition       mWatchdogCondition; // Condition variable for stop/start
-    String8         mCameraId;          // Camera Id the watchdog belongs to
+    std::string     mCameraId;          // Camera Id the watchdog belongs to
     bool            mPause;             // True if tid map is empty
     uint32_t        mMaxCycles;         // Max cycles
     uint32_t        mCycleLengthMs;     // Length of time elapsed per cycle
diff --git a/services/camera/libcameraservice/aidl/AidlCameraService.cpp b/services/camera/libcameraservice/aidl/AidlCameraService.cpp
index 4232a81..a62f6de 100644
--- a/services/camera/libcameraservice/aidl/AidlCameraService.cpp
+++ b/services/camera/libcameraservice/aidl/AidlCameraService.cpp
@@ -86,7 +86,7 @@
     if (_aidl_return == nullptr) { return fromSStatus(SStatus::ILLEGAL_ARGUMENT); }
 
     ::android::CameraMetadata cameraMetadata;
-    UStatus ret = mCameraService->getCameraCharacteristics(String16(in_cameraId.c_str()),
+    UStatus ret = mCameraService->getCameraCharacteristics(in_cameraId,
                                                            mVndkVersion,
                                                            /* overrideToPortrait= */ false,
                                                            &cameraMetadata);
@@ -140,8 +140,8 @@
     sp<hardware::camera2::ICameraDeviceCallbacks> callbacks = hybridCallbacks;
     binder::Status serviceRet = mCameraService->connectDevice(
             callbacks,
-            String16(in_cameraId.c_str()),
-            String16(""),
+            in_cameraId,
+            std::string(),
             /* clientFeatureId= */{},
             hardware::ICameraService::USE_CALLING_UID,
             /* scoreOffset= */ 0,
@@ -249,7 +249,7 @@
             [this](const hardware::CameraStatus& s) {
                 bool supportsHAL3 = false;
                 binder::Status sRet =
-                            mCameraService->supportsCameraApi(String16(s.cameraId),
+                            mCameraService->supportsCameraApi(s.cameraId,
                                     UICameraService::API_VERSION_2, &supportsHAL3);
                 return !sRet.isOk() || !supportsHAL3;
             }), cameraStatusAndIds->end());
diff --git a/services/camera/libcameraservice/aidl/AidlCameraServiceListener.cpp b/services/camera/libcameraservice/aidl/AidlCameraServiceListener.cpp
index e183063..d7ab0d9 100644
--- a/services/camera/libcameraservice/aidl/AidlCameraServiceListener.cpp
+++ b/services/camera/libcameraservice/aidl/AidlCameraServiceListener.cpp
@@ -18,6 +18,7 @@
 #include <aidl/AidlUtils.h>
 #include <aidl/android/frameworks/cameraservice/common/Status.h>
 #include <aidl/android/frameworks/cameraservice/service/CameraStatusAndId.h>
+#include <camera/StringUtils.h>
 
 namespace android::frameworks::cameraservice::service::implementation {
 
@@ -27,34 +28,31 @@
 using SStatus = ::aidl::android::frameworks::cameraservice::common::Status;
 
 binder::Status AidlCameraServiceListener::onStatusChanged(
-        int32_t status, const ::android::String16& cameraId) {
+        int32_t status, const std::string& cameraId) {
     SCameraDeviceStatus sStatus = convertCameraStatusToAidl(status);
-    std::string sCameraId = String8(cameraId).string();
-    auto ret = mBase->onStatusChanged(sStatus, sCameraId);
+    auto ret = mBase->onStatusChanged(sStatus, cameraId);
     LOG_STATUS_ERROR_IF_NOT_OK(ret, "onStatusChanged")
     return binder::Status::ok();
 }
 
 binder::Status AidlCameraServiceListener::onPhysicalCameraStatusChanged(
-        int32_t status, const ::android::String16& cameraId,
-        const ::android::String16& physicalCameraId) {
+        int32_t status, const std::string& cameraId,
+        const std::string& physicalCameraId) {
     SCameraDeviceStatus sStatus = convertCameraStatusToAidl(status);
-    std::string sCameraId = String8(cameraId).string();
-    std::string sPhysicalCameraId = String8(physicalCameraId).string();
 
-    auto ret = mBase->onPhysicalCameraStatusChanged(sStatus, sCameraId, sPhysicalCameraId);
+    auto ret = mBase->onPhysicalCameraStatusChanged(sStatus, cameraId, physicalCameraId);
     LOG_STATUS_ERROR_IF_NOT_OK(ret, "onPhysicalCameraStatusChanged")
     return binder::Status::ok();
 }
 
 ::android::binder::Status AidlCameraServiceListener::onTorchStatusChanged(
-    int32_t, const ::android::String16&) {
+    int32_t, const std::string&) {
   // We don't implement onTorchStatusChanged
   return binder::Status::ok();
 }
 
 ::android::binder::Status AidlCameraServiceListener::onTorchStrengthLevelChanged(
-    const ::android::String16&, int32_t) {
+    const std::string&, int32_t) {
     // We don't implement onTorchStrengthLevelChanged
     return binder::Status::ok();
 }
diff --git a/services/camera/libcameraservice/aidl/AidlCameraServiceListener.h b/services/camera/libcameraservice/aidl/AidlCameraServiceListener.h
index 906dd8e..6483fe1 100644
--- a/services/camera/libcameraservice/aidl/AidlCameraServiceListener.h
+++ b/services/camera/libcameraservice/aidl/AidlCameraServiceListener.h
@@ -45,25 +45,25 @@
     ~AidlCameraServiceListener() = default;
 
     ::android::binder::Status onStatusChanged(int32_t status,
-            const ::android::String16& cameraId) override;
+            const std::string& cameraId) override;
     ::android::binder::Status onPhysicalCameraStatusChanged(int32_t status,
-            const ::android::String16& cameraId,
-            const ::android::String16& physicalCameraId) override;
+            const std::string& cameraId,
+            const std::string& physicalCameraId) override;
 
     ::android::binder::Status onTorchStatusChanged(
-            int32_t status, const ::android::String16& cameraId) override;
+            int32_t status, const std::string& cameraId) override;
     ::android::binder::Status onTorchStrengthLevelChanged(
-            const ::android::String16& cameraId, int32_t newStrengthLevel) override;
+            const std::string& cameraId, int32_t newStrengthLevel) override;
     binder::Status onCameraAccessPrioritiesChanged() override {
         // TODO: no implementation yet.
         return binder::Status::ok();
     }
-    binder::Status onCameraOpened(const ::android::String16& /*cameraId*/,
-            const ::android::String16& /*clientPackageId*/) override {
+    binder::Status onCameraOpened(const std::string& /*cameraId*/,
+            const std::string& /*clientPackageId*/) override {
         // empty implementation
         return binder::Status::ok();
     }
-    binder::Status onCameraClosed(const ::android::String16& /*cameraId*/) override {
+    binder::Status onCameraClosed(const std::string& /*cameraId*/) override {
         // empty implementation
         return binder::Status::ok();
     }
diff --git a/services/camera/libcameraservice/aidl/AidlUtils.cpp b/services/camera/libcameraservice/aidl/AidlUtils.cpp
index 1b8e53b..7291c5f 100644
--- a/services/camera/libcameraservice/aidl/AidlUtils.cpp
+++ b/services/camera/libcameraservice/aidl/AidlUtils.cpp
@@ -22,6 +22,7 @@
 #include <device3/Camera3StreamInterface.h>
 #include <gui/bufferqueue/1.0/H2BGraphicBufferProducer.h>
 #include <mediautils/AImageReaderUtils.h>
+#include <camera/StringUtils.h>
 
 namespace android::hardware::cameraservice::utils::conversion::aidl {
 
@@ -80,9 +81,8 @@
         iGBPs.push_back(new H2BGraphicBufferProducer(AImageReader_getHGBPFromHandle(nh)));
         native_handle_delete(nh);
     }
-    String16 physicalCameraId16(src.physicalCameraId.c_str());
     UOutputConfiguration outputConfiguration(
-        iGBPs, convertFromAidl(src.rotation), physicalCameraId16,
+        iGBPs, convertFromAidl(src.rotation), src.physicalCameraId,
         src.windowGroupId, OutputConfiguration::SURFACE_TYPE_UNKNOWN, 0, 0,
         (windowHandles.size() > 1));
     return outputConfiguration;
@@ -175,7 +175,7 @@
     dst.frameNumber = src.frameNumber;
     dst.partialResultCount = src.partialResultCount;
     dst.errorStreamId = src.errorStreamId;
-    dst.errorPhysicalCameraId = String8(src.errorPhysicalCameraId).string();
+    dst.errorPhysicalCameraId = src.errorPhysicalCameraId;
     return dst;
 }
 
@@ -217,7 +217,7 @@
 SPhysicalCaptureResultInfo convertToAidl(const UPhysicalCaptureResultInfo & src,
                                          std::shared_ptr<CaptureResultMetadataQueue> & fmq) {
     SPhysicalCaptureResultInfo dst;
-    dst.physicalCameraId = String8(src.mPhysicalCameraId).string();
+    dst.physicalCameraId = src.mPhysicalCameraId;
 
     const camera_metadata_t *rawMetadata = src.mPhysicalCameraMetadata.getAndLock();
     // Try using fmq at first.
@@ -242,12 +242,12 @@
     size_t i = 0;
     for (const auto &statusAndId : src) {
         auto &a = (*dst)[i++];
-        a.cameraId = statusAndId.cameraId.c_str();
+        a.cameraId = statusAndId.cameraId;
         a.deviceStatus = convertCameraStatusToAidl(statusAndId.status);
         size_t numUnvailPhysicalCameras = statusAndId.unavailablePhysicalIds.size();
         a.unavailPhysicalCameraIds.resize(numUnvailPhysicalCameras);
         for (size_t j = 0; j < numUnvailPhysicalCameras; j++) {
-            a.unavailPhysicalCameraIds[j] = statusAndId.unavailablePhysicalIds[j].c_str();
+            a.unavailPhysicalCameraIds[j] = statusAndId.unavailablePhysicalIds[j];
         }
     }
 }
@@ -302,4 +302,4 @@
     return OK;
 }
 
-} // namespace android::hardware::cameraservice::utils::conversion::aidl
\ No newline at end of file
+} // namespace android::hardware::cameraservice::utils::conversion::aidl
diff --git a/services/camera/libcameraservice/api1/Camera2Client.cpp b/services/camera/libcameraservice/api1/Camera2Client.cpp
index 8348cd9..4876195 100644
--- a/services/camera/libcameraservice/api1/Camera2Client.cpp
+++ b/services/camera/libcameraservice/api1/Camera2Client.cpp
@@ -18,11 +18,14 @@
 #define ATRACE_TAG ATRACE_TAG_CAMERA
 //#define LOG_NDEBUG 0
 
+#include <sstream>
+
 #include <inttypes.h>
 #include <utils/Log.h>
 #include <utils/Trace.h>
 
 #include <camera/CameraUtils.h>
+#include <camera/StringUtils.h>
 #include <cutils/properties.h>
 #include <gui/Surface.h>
 #include <android/hardware/camera2/ICameraDeviceCallbacks.h>
@@ -53,9 +56,9 @@
 Camera2Client::Camera2Client(const sp<CameraService>& cameraService,
         const sp<hardware::ICameraClient>& cameraClient,
         std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
-        const String16& clientPackageName,
-        const std::optional<String16>& clientFeatureId,
-        const String8& cameraDeviceId,
+        const std::string& clientPackageName,
+        const std::optional<std::string>& clientFeatureId,
+        const std::string& cameraDeviceId,
         int api1CameraId,
         int cameraFacing,
         int sensorOrientation,
@@ -83,7 +86,8 @@
     l.mParameters.isSlowJpegModeForced = forceSlowJpegMode;
 }
 
-status_t Camera2Client::initialize(sp<CameraProviderManager> manager, const String8& monitorTags) {
+status_t Camera2Client::initialize(sp<CameraProviderManager> manager,
+        const std::string& monitorTags) {
     return initializeImpl(manager, monitorTags);
 }
 
@@ -103,7 +107,7 @@
 }
 
 template<typename TProviderPtr>
-status_t Camera2Client::initializeImpl(TProviderPtr providerPtr, const String8& monitorTags)
+status_t Camera2Client::initializeImpl(TProviderPtr providerPtr, const std::string& monitorTags)
 {
     ATRACE_CALL();
     ALOGV("%s: Initializing client for camera %d", __FUNCTION__, mCameraId);
@@ -135,16 +139,11 @@
     CameraUtils::getRotationTransform(staticInfo, OutputConfiguration::MIRROR_MODE_AUTO,
             &mRotateAndCropPreviewTransform);
 
-    String8 threadName;
-
     mStreamingProcessor = new StreamingProcessor(this);
-    threadName = String8::format("C2-%d-StreamProc",
-            mCameraId);
 
+    std::string threadName = std::string("C2-") + std::to_string(mCameraId);
     mFrameProcessor = new FrameProcessor(mDevice, this);
-    threadName = String8::format("C2-%d-FrameProc",
-            mCameraId);
-    res = mFrameProcessor->run(threadName.string());
+    res = mFrameProcessor->run((threadName + "-FrameProc").c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start frame processor thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -152,9 +151,7 @@
     }
 
     mCaptureSequencer = new CaptureSequencer(this);
-    threadName = String8::format("C2-%d-CaptureSeq",
-            mCameraId);
-    res = mCaptureSequencer->run(threadName.string());
+    res = mCaptureSequencer->run((threadName + "-CaptureSeq").c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start capture sequencer thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -162,9 +159,7 @@
     }
 
     mJpegProcessor = new JpegProcessor(this, mCaptureSequencer);
-    threadName = String8::format("C2-%d-JpegProc",
-            mCameraId);
-    res = mJpegProcessor->run(threadName.string());
+    res = mJpegProcessor->run((threadName + "-JpegProc").c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start jpeg processor thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -172,10 +167,7 @@
     }
 
     mZslProcessor = new ZslProcessor(this, mCaptureSequencer);
-
-    threadName = String8::format("C2-%d-ZslProc",
-            mCameraId);
-    res = mZslProcessor->run(threadName.string());
+    res = mZslProcessor->run((threadName + "-ZslProc").c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start zsl processor thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -183,9 +175,7 @@
     }
 
     mCallbackProcessor = new CallbackProcessor(this);
-    threadName = String8::format("C2-%d-CallbkProc",
-            mCameraId);
-    res = mCallbackProcessor->run(threadName.string());
+    res = mCallbackProcessor->run((threadName + "-CallbkProc").c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start callback processor thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -218,47 +208,47 @@
 }
 
 status_t Camera2Client::dumpClient(int fd, const Vector<String16>& args) {
-    String8 result;
-    result.appendFormat("Client2[%d] (%p) PID: %d, dump:\n", mCameraId,
+    std::ostringstream result;
+    result << fmt::sprintf("Client2[%d] (%p) PID: %d, dump:\n", mCameraId,
             (getRemoteCallback() != NULL ?
-                    (IInterface::asBinder(getRemoteCallback()).get()) : NULL),
+                    (void *) (IInterface::asBinder(getRemoteCallback()).get()) : NULL),
             mClientPid);
-    result.append("  State: ");
-#define CASE_APPEND_ENUM(x) case x: result.append(#x "\n"); break;
+    result << "  State: ";
+#define CASE_APPEND_ENUM(x) case x: result << #x "\n"; break;
 
     const Parameters& p = mParameters.unsafeAccess();
 
-    result.append(Parameters::getStateName(p.state));
+    result << Parameters::getStateName(p.state);
 
-    result.append("\n  Current parameters:\n");
-    result.appendFormat("    Preview size: %d x %d\n",
+    result << "\n  Current parameters:\n";
+    result << fmt::sprintf("    Preview size: %d x %d\n",
             p.previewWidth, p.previewHeight);
-    result.appendFormat("    Preview FPS range: %d - %d\n",
+    result << fmt::sprintf("    Preview FPS range: %d - %d\n",
             p.previewFpsRange[0], p.previewFpsRange[1]);
-    result.appendFormat("    Preview HAL pixel format: 0x%x\n",
+    result << fmt::sprintf("    Preview HAL pixel format: 0x%x\n",
             p.previewFormat);
-    result.appendFormat("    Preview transform: %x\n",
+    result << fmt::sprintf("    Preview transform: %x\n",
             p.previewTransform);
-    result.appendFormat("    Picture size: %d x %d\n",
+    result << fmt::sprintf("    Picture size: %d x %d\n",
             p.pictureWidth, p.pictureHeight);
-    result.appendFormat("    Jpeg thumbnail size: %d x %d\n",
+    result << fmt::sprintf("    Jpeg thumbnail size: %d x %d\n",
             p.jpegThumbSize[0], p.jpegThumbSize[1]);
-    result.appendFormat("    Jpeg quality: %d, thumbnail quality: %d\n",
+    result << fmt::sprintf("    Jpeg quality: %d, thumbnail quality: %d\n",
             p.jpegQuality, p.jpegThumbQuality);
-    result.appendFormat("    Jpeg rotation: %d\n", p.jpegRotation);
-    result.appendFormat("    GPS tags %s\n",
+    result << fmt::sprintf("    Jpeg rotation: %d\n", p.jpegRotation);
+    result << fmt::sprintf("    GPS tags %s\n",
             p.gpsEnabled ? "enabled" : "disabled");
     if (p.gpsEnabled) {
-        result.appendFormat("    GPS lat x long x alt: %f x %f x %f\n",
+        result << fmt::sprintf("    GPS lat x long x alt: %f x %f x %f\n",
                 p.gpsCoordinates[0], p.gpsCoordinates[1],
                 p.gpsCoordinates[2]);
-        result.appendFormat("    GPS timestamp: %" PRId64 "\n",
+        result << fmt::sprintf("    GPS timestamp: %" PRId64 "\n",
                 p.gpsTimestamp);
-        result.appendFormat("    GPS processing method: %s\n",
+        result << fmt::sprintf("    GPS processing method: %s\n",
                 p.gpsProcessingMethod.string());
     }
 
-    result.append("    White balance mode: ");
+    result << "    White balance mode: ";
     switch (p.wbMode) {
         CASE_APPEND_ENUM(ANDROID_CONTROL_AWB_MODE_AUTO)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AWB_MODE_INCANDESCENT)
@@ -268,10 +258,10 @@
         CASE_APPEND_ENUM(ANDROID_CONTROL_AWB_MODE_CLOUDY_DAYLIGHT)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AWB_MODE_TWILIGHT)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AWB_MODE_SHADE)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("    Effect mode: ");
+    result << "    Effect mode: ";
     switch (p.effectMode) {
         CASE_APPEND_ENUM(ANDROID_CONTROL_EFFECT_MODE_OFF)
         CASE_APPEND_ENUM(ANDROID_CONTROL_EFFECT_MODE_MONO)
@@ -282,22 +272,22 @@
         CASE_APPEND_ENUM(ANDROID_CONTROL_EFFECT_MODE_WHITEBOARD)
         CASE_APPEND_ENUM(ANDROID_CONTROL_EFFECT_MODE_BLACKBOARD)
         CASE_APPEND_ENUM(ANDROID_CONTROL_EFFECT_MODE_AQUA)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("    Antibanding mode: ");
+    result << "    Antibanding mode: ";
     switch (p.antibandingMode) {
         CASE_APPEND_ENUM(ANDROID_CONTROL_AE_ANTIBANDING_MODE_AUTO)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AE_ANTIBANDING_MODE_OFF)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AE_ANTIBANDING_MODE_50HZ)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AE_ANTIBANDING_MODE_60HZ)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("    Scene mode: ");
+    result << "    Scene mode: ";
     switch (p.sceneMode) {
         case ANDROID_CONTROL_SCENE_MODE_DISABLED:
-            result.append("AUTO\n"); break;
+            result << "AUTO\n"; break;
         CASE_APPEND_ENUM(ANDROID_CONTROL_SCENE_MODE_FACE_PRIORITY)
         CASE_APPEND_ENUM(ANDROID_CONTROL_SCENE_MODE_ACTION)
         CASE_APPEND_ENUM(ANDROID_CONTROL_SCENE_MODE_PORTRAIT)
@@ -314,10 +304,10 @@
         CASE_APPEND_ENUM(ANDROID_CONTROL_SCENE_MODE_PARTY)
         CASE_APPEND_ENUM(ANDROID_CONTROL_SCENE_MODE_CANDLELIGHT)
         CASE_APPEND_ENUM(ANDROID_CONTROL_SCENE_MODE_BARCODE)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("    Flash mode: ");
+    result << "    Flash mode: ";
     switch (p.flashMode) {
         CASE_APPEND_ENUM(Parameters::FLASH_MODE_OFF)
         CASE_APPEND_ENUM(Parameters::FLASH_MODE_AUTO)
@@ -325,10 +315,10 @@
         CASE_APPEND_ENUM(Parameters::FLASH_MODE_TORCH)
         CASE_APPEND_ENUM(Parameters::FLASH_MODE_RED_EYE)
         CASE_APPEND_ENUM(Parameters::FLASH_MODE_INVALID)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("    Focus mode: ");
+    result << "    Focus mode: ";
     switch (p.focusMode) {
         CASE_APPEND_ENUM(Parameters::FOCUS_MODE_AUTO)
         CASE_APPEND_ENUM(Parameters::FOCUS_MODE_MACRO)
@@ -338,10 +328,10 @@
         CASE_APPEND_ENUM(Parameters::FOCUS_MODE_INFINITY)
         CASE_APPEND_ENUM(Parameters::FOCUS_MODE_FIXED)
         CASE_APPEND_ENUM(Parameters::FOCUS_MODE_INVALID)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("   Focus state: ");
+    result << "   Focus state: ";
     switch (p.focusState) {
         CASE_APPEND_ENUM(ANDROID_CONTROL_AF_STATE_INACTIVE)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AF_STATE_PASSIVE_SCAN)
@@ -350,12 +340,12 @@
         CASE_APPEND_ENUM(ANDROID_CONTROL_AF_STATE_ACTIVE_SCAN)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AF_STATE_FOCUSED_LOCKED)
         CASE_APPEND_ENUM(ANDROID_CONTROL_AF_STATE_NOT_FOCUSED_LOCKED)
-        default: result.append("UNKNOWN\n");
+        default: result << "UNKNOWN\n";
     }
 
-    result.append("    Focusing areas:\n");
+    result << "    Focusing areas:\n";
     for (size_t i = 0; i < p.focusingAreas.size(); i++) {
-        result.appendFormat("      [ (%d, %d, %d, %d), weight %d ]\n",
+        result << fmt::sprintf("      [ (%d, %d, %d, %d), weight %d ]\n",
                 p.focusingAreas[i].left,
                 p.focusingAreas[i].top,
                 p.focusingAreas[i].right,
@@ -363,16 +353,16 @@
                 p.focusingAreas[i].weight);
     }
 
-    result.appendFormat("    Exposure compensation index: %d\n",
+    result << fmt::sprintf("    Exposure compensation index: %d\n",
             p.exposureCompensation);
 
-    result.appendFormat("    AE lock %s, AWB lock %s\n",
+    result << fmt::sprintf("    AE lock %s, AWB lock %s\n",
             p.autoExposureLock ? "enabled" : "disabled",
             p.autoWhiteBalanceLock ? "enabled" : "disabled" );
 
-    result.appendFormat("    Metering areas:\n");
+    result << "    Metering areas:\n";
     for (size_t i = 0; i < p.meteringAreas.size(); i++) {
-        result.appendFormat("      [ (%d, %d, %d, %d), weight %d ]\n",
+        result << fmt::sprintf("      [ (%d, %d, %d, %d), weight %d ]\n",
                 p.meteringAreas[i].left,
                 p.meteringAreas[i].top,
                 p.meteringAreas[i].right,
@@ -380,54 +370,56 @@
                 p.meteringAreas[i].weight);
     }
 
-    result.appendFormat("    Zoom index: %d\n", p.zoom);
-    result.appendFormat("    Video size: %d x %d\n", p.videoWidth,
+    result << fmt::sprintf("    Zoom index: %d\n", p.zoom);
+    result << fmt::sprintf("    Video size: %d x %d\n", p.videoWidth,
             p.videoHeight);
 
-    result.appendFormat("    Recording hint is %s\n",
+    result << fmt::sprintf("    Recording hint is %s\n",
             p.recordingHint ? "set" : "not set");
 
-    result.appendFormat("    Video stabilization is %s\n",
+    result << fmt::sprintf("    Video stabilization is %s\n",
             p.videoStabilization ? "enabled" : "disabled");
 
-    result.appendFormat("    Selected still capture FPS range: %d - %d\n",
+    result << fmt::sprintf("    Selected still capture FPS range: %d - %d\n",
             p.fastInfo.bestStillCaptureFpsRange[0],
             p.fastInfo.bestStillCaptureFpsRange[1]);
 
-    result.appendFormat("    Use zero shutter lag: %s\n",
+    result << fmt::sprintf("    Use zero shutter lag: %s\n",
             p.useZeroShutterLag() ? "yes" : "no");
 
-    result.append("  Current streams:\n");
-    result.appendFormat("    Preview stream ID: %d\n",
+    result << "  Current streams:\n";
+    result << fmt::sprintf("    Preview stream ID: %d\n",
             getPreviewStreamId());
-    result.appendFormat("    Capture stream ID: %d\n",
+    result << fmt::sprintf("    Capture stream ID: %d\n",
             getCaptureStreamId());
-    result.appendFormat("    Recording stream ID: %d\n",
+    result << fmt::sprintf("    Recording stream ID: %d\n",
             getRecordingStreamId());
 
-    result.append("  Quirks for this camera:\n");
+    result << "  Quirks for this camera:\n";
     bool haveQuirk = false;
     if (p.quirks.triggerAfWithAuto) {
-        result.appendFormat("    triggerAfWithAuto\n");
+        result << "    triggerAfWithAuto\n";
         haveQuirk = true;
     }
     if (p.quirks.useZslFormat) {
-        result.appendFormat("    useZslFormat\n");
+        result << "    useZslFormat\n";
         haveQuirk = true;
     }
     if (p.quirks.meteringCropRegion) {
-        result.appendFormat("    meteringCropRegion\n");
+        result << "    meteringCropRegion\n";
         haveQuirk = true;
     }
     if (p.quirks.partialResults) {
-        result.appendFormat("    usePartialResult\n");
+        result << "    usePartialResult\n";
         haveQuirk = true;
     }
     if (!haveQuirk) {
-        result.appendFormat("    none\n");
+        result << "    none\n";
     }
 
-    write(fd, result.string(), result.size());
+    std::string resultStr = std::move(result.str());
+
+    write(fd, resultStr.c_str(), resultStr.size());
 
     mStreamingProcessor->dump(fd, args);
 
diff --git a/services/camera/libcameraservice/api1/Camera2Client.h b/services/camera/libcameraservice/api1/Camera2Client.h
index 6bdb644..fe12690 100644
--- a/services/camera/libcameraservice/api1/Camera2Client.h
+++ b/services/camera/libcameraservice/api1/Camera2Client.h
@@ -107,9 +107,9 @@
     Camera2Client(const sp<CameraService>& cameraService,
             const sp<hardware::ICameraClient>& cameraClient,
             std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
-            const String16& clientPackageName,
-            const std::optional<String16>& clientFeatureId,
-            const String8& cameraDeviceId,
+            const std::string& clientPackageName,
+            const std::optional<std::string>& clientFeatureId,
+            const std::string& cameraDeviceId,
             int api1CameraId,
             int cameraFacing,
             int sensorOrientation,
@@ -123,7 +123,7 @@
     virtual ~Camera2Client();
 
     virtual status_t initialize(sp<CameraProviderManager> manager,
-            const String8& monitorTags) override;
+            const std::string& monitorTags) override;
 
     virtual status_t dump(int fd, const Vector<String16>& args);
 
@@ -248,7 +248,7 @@
     status_t overrideVideoSnapshotSize(Parameters &params);
 
     template<typename TProviderPtr>
-    status_t initializeImpl(TProviderPtr providerPtr, const String8& monitorTags);
+    status_t initializeImpl(TProviderPtr providerPtr, const std::string& monitorTags);
 
     bool isZslEnabledInStillTemplate();
     // The current rotate & crop mode passed by camera service
diff --git a/services/camera/libcameraservice/api1/client2/CallbackProcessor.cpp b/services/camera/libcameraservice/api1/client2/CallbackProcessor.cpp
index ee764ec..17db20b 100644
--- a/services/camera/libcameraservice/api1/client2/CallbackProcessor.cpp
+++ b/services/camera/libcameraservice/api1/client2/CallbackProcessor.cpp
@@ -158,7 +158,7 @@
         res = device->createStream(mCallbackWindow,
                 params.previewWidth, params.previewHeight, callbackFormat,
                 HAL_DATASPACE_V0_JFIF, CAMERA_STREAM_ROTATION_0, &mCallbackStreamId,
-                String8(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
+                std::string(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
         if (res != OK) {
             ALOGE("%s: Camera %d: Can't create output stream for callbacks: "
                     "%s (%d)", __FUNCTION__, mId,
diff --git a/services/camera/libcameraservice/api1/client2/CaptureSequencer.cpp b/services/camera/libcameraservice/api1/client2/CaptureSequencer.cpp
index 4c9b7ed..0b5e03f 100644
--- a/services/camera/libcameraservice/api1/client2/CaptureSequencer.cpp
+++ b/services/camera/libcameraservice/api1/client2/CaptureSequencer.cpp
@@ -23,6 +23,7 @@
 #include <utils/Log.h>
 #include <utils/Trace.h>
 #include <utils/Vector.h>
+#include <camera/StringUtils.h>
 
 #include "api1/Camera2Client.h"
 #include "api1/client2/CaptureSequencer.h"
@@ -174,19 +175,19 @@
 
 
 void CaptureSequencer::dump(int fd, const Vector<String16>& /*args*/) {
-    String8 result;
+    std::string result;
     if (mCaptureRequest.entryCount() != 0) {
         result = "    Capture request:\n";
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
         mCaptureRequest.dump(fd, 2, 6);
     } else {
         result = "    Capture request: undefined\n";
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
     }
-    result = String8::format("    Current capture state: %s\n",
+    result = fmt::sprintf("    Current capture state: %s\n",
             kStateNames[mCaptureState]);
-    result.append("    Latest captured frame:\n");
-    write(fd, result.string(), result.size());
+    result += "    Latest captured frame:\n";
+    write(fd, result.c_str(), result.size());
     mNewFrame.dump(fd, 2, 6);
 }
 
diff --git a/services/camera/libcameraservice/api1/client2/JpegProcessor.cpp b/services/camera/libcameraservice/api1/client2/JpegProcessor.cpp
index 467108d..eb00bf8 100755
--- a/services/camera/libcameraservice/api1/client2/JpegProcessor.cpp
+++ b/services/camera/libcameraservice/api1/client2/JpegProcessor.cpp
@@ -83,7 +83,7 @@
     }
 
     // Find out buffer size for JPEG
-    ssize_t maxJpegSize = device->getJpegBufferSize(device->infoPhysical(String8("")),
+    ssize_t maxJpegSize = device->getJpegBufferSize(device->infoPhysical(""),
             params.pictureWidth, params.pictureHeight);
     if (maxJpegSize <= 0) {
         ALOGE("%s: Camera %d: Jpeg buffer size (%zu) is invalid ",
@@ -157,7 +157,7 @@
                 params.pictureWidth, params.pictureHeight,
                 HAL_PIXEL_FORMAT_BLOB, HAL_DATASPACE_V0_JFIF,
                 CAMERA_STREAM_ROTATION_0, &mCaptureStreamId,
-                String8(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
+                std::string(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
         if (res != OK) {
             ALOGE("%s: Camera %d: Can't create output stream for capture: "
                     "%s (%d)", __FUNCTION__, mId,
diff --git a/services/camera/libcameraservice/api1/client2/StreamingProcessor.cpp b/services/camera/libcameraservice/api1/client2/StreamingProcessor.cpp
index 2d3597c..ff71e6b 100644
--- a/services/camera/libcameraservice/api1/client2/StreamingProcessor.cpp
+++ b/services/camera/libcameraservice/api1/client2/StreamingProcessor.cpp
@@ -31,6 +31,7 @@
 #include <gui/BufferItem.h>
 #include <gui/Surface.h>
 #include <media/hardware/HardwareAPI.h>
+#include <camera/StringUtils.h>
 
 #include "common/CameraDeviceBase.h"
 #include "api1/Camera2Client.h"
@@ -198,7 +199,7 @@
         res = device->createStream(mPreviewWindow,
                 params.previewWidth, params.previewHeight,
                 CAMERA2_HAL_PIXEL_FORMAT_OPAQUE, HAL_DATASPACE_UNKNOWN,
-                CAMERA_STREAM_ROTATION_0, &mPreviewStreamId, String8(),
+                CAMERA_STREAM_ROTATION_0, &mPreviewStreamId, std::string(),
                 std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
         if (res != OK) {
             ALOGE("%s: Camera %d: Unable to create preview stream: %s (%d)",
@@ -385,7 +386,7 @@
                 params.videoWidth, params.videoHeight,
                 params.videoFormat, params.videoDataSpace,
                 CAMERA_STREAM_ROTATION_0, &mRecordingStreamId,
-                String8(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
+                std::string(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
         if (res != OK) {
             ALOGE("%s: Camera %d: Can't create output stream for recording: "
                     "%s (%d)", __FUNCTION__, mId,
@@ -585,21 +586,21 @@
 }
 
 status_t StreamingProcessor::dump(int fd, const Vector<String16>& /*args*/) {
-    String8 result;
+    std::string result;
 
-    result.append("  Current requests:\n");
+    result += "  Current requests:\n";
     if (mPreviewRequest.entryCount() != 0) {
-        result.append("    Preview request:\n");
-        write(fd, result.string(), result.size());
+        result += "    Preview request:\n";
+        write(fd, result.c_str(), result.size());
         mPreviewRequest.dump(fd, 2, 6);
         result.clear();
     } else {
-        result.append("    Preview request: undefined\n");
+        result += "    Preview request: undefined\n";
     }
 
     if (mRecordingRequest.entryCount() != 0) {
         result = "    Recording request:\n";
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
         mRecordingRequest.dump(fd, 2, 6);
         result.clear();
     } else {
@@ -609,11 +610,11 @@
     const char* streamTypeString[] = {
         "none", "preview", "record"
     };
-    result.append(String8::format("   Active request: %s (paused: %s)\n",
-                                  streamTypeString[mActiveRequest],
-                                  mPaused ? "yes" : "no"));
+    result += fmt::sprintf("   Active request: %s (paused: %s\n",
+            streamTypeString[mActiveRequest],
+            mPaused ? "yes" : "no");
 
-    write(fd, result.string(), result.size());
+    write(fd, result.c_str(), result.size());
 
     return OK;
 }
diff --git a/services/camera/libcameraservice/api1/client2/ZslProcessor.cpp b/services/camera/libcameraservice/api1/client2/ZslProcessor.cpp
index 1321e6b..d6c2415 100644
--- a/services/camera/libcameraservice/api1/client2/ZslProcessor.cpp
+++ b/services/camera/libcameraservice/api1/client2/ZslProcessor.cpp
@@ -30,6 +30,7 @@
 #include <utils/Log.h>
 #include <utils/Trace.h>
 #include <gui/Surface.h>
+#include <camera/StringUtils.h>
 
 #include "common/CameraDeviceBase.h"
 #include "api1/Camera2Client.h"
@@ -255,13 +256,13 @@
         BufferQueue::createBufferQueue(&producer, &consumer);
         mProducer = new RingBufferConsumer(consumer, GRALLOC_USAGE_HW_CAMERA_ZSL,
             mBufferQueueDepth);
-        mProducer->setName(String8("Camera2-ZslRingBufferConsumer"));
+        mProducer->setName("Camera2-ZslRingBufferConsumer");
         sp<Surface> outSurface = new Surface(producer);
 
         res = device->createStream(outSurface, params.fastInfo.usedZslSize.width,
             params.fastInfo.usedZslSize.height, HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED,
             HAL_DATASPACE_UNKNOWN, CAMERA_STREAM_ROTATION_0, &mZslStreamId,
-            String8(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
+            std::string(), std::unordered_set<int32_t>{ANDROID_SENSOR_PIXEL_MODE_DEFAULT});
         if (res != OK) {
             ALOGE("%s: Camera %d: Can't create ZSL stream: "
                     "%s (%d)", __FUNCTION__, client->getCameraId(),
@@ -680,12 +681,12 @@
 void ZslProcessor::dump(int fd, const Vector<String16>& /*args*/) const {
     Mutex::Autolock l(mInputMutex);
     if (!mLatestCapturedRequest.isEmpty()) {
-        String8 result("    Latest ZSL capture request:\n");
-        write(fd, result.string(), result.size());
+        std::string result = "    Latest ZSL capture request:\n";
+        write(fd, result.c_str(), result.size());
         mLatestCapturedRequest.dump(fd, 2, 6);
     } else {
-        String8 result("    Latest ZSL capture request: none yet\n");
-        write(fd, result.string(), result.size());
+        std::string result = "    Latest ZSL capture request: none yet\n";
+        write(fd, result.c_str(), result.size());
     }
     dumpZslQueue(fd);
 }
@@ -706,12 +707,12 @@
 }
 
 void ZslProcessor::dumpZslQueue(int fd) const {
-    String8 header("ZSL queue contents:");
-    String8 indent("    ");
-    ALOGV("%s", header.string());
+    std::string header = "ZSL queue contents:";
+    std::string indent = "    ";
+    ALOGV("%s", header.c_str());
     if (fd != -1) {
         header = indent + header + "\n";
-        write(fd, header.string(), header.size());
+        write(fd, header.c_str(), header.size());
     }
     for (size_t i = 0; i < mZslQueue.size(); i++) {
         const ZslPair &queueEntry = mZslQueue[i];
@@ -725,13 +726,13 @@
             entry = queueEntry.frame.find(ANDROID_CONTROL_AE_STATE);
             if (entry.count > 0) frameAeState = entry.data.u8[0];
         }
-        String8 result =
-                String8::format("   %zu: b: %" PRId64 "\tf: %" PRId64 ", AE state: %d", i,
+        std::string result =
+                fmt::sprintf("   %zu: b: %" PRId64 "\tf: %" PRId64 ", AE state: %d", i,
                         bufferTimestamp, frameTimestamp, frameAeState);
-        ALOGV("%s", result.string());
+        ALOGV("%s", result.c_str());
         if (fd != -1) {
             result = indent + result + "\n";
-            write(fd, result.string(), result.size());
+            write(fd, result.c_str(), result.size());
         }
 
     }
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
index 38c615d..c60f327 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.cpp
@@ -26,6 +26,7 @@
 #include <gui/Surface.h>
 #include <camera/camera2/CaptureRequest.h>
 #include <camera/CameraUtils.h>
+#include <camera/StringUtils.h>
 
 #include "common/CameraDeviceBase.h"
 #include "device3/Camera3Device.h"
@@ -42,12 +43,12 @@
 
 #define STATUS_ERROR(errorCode, errorString) \
     binder::Status::fromServiceSpecificError(errorCode, \
-            String8::format("%s:%d: %s", __FUNCTION__, __LINE__, errorString))
+            fmt::sprintf("%s:%d: %s", __FUNCTION__, __LINE__, errorString).c_str())
 
 #define STATUS_ERROR_FMT(errorCode, errorString, ...) \
     binder::Status::fromServiceSpecificError(errorCode, \
-            String8::format("%s:%d: " errorString, __FUNCTION__, __LINE__, \
-                    __VA_ARGS__))
+            fmt::sprintf("%s:%d: " errorString, __FUNCTION__, __LINE__, \
+                    __VA_ARGS__).c_str())
 
 namespace android {
 using namespace camera2;
@@ -57,10 +58,10 @@
 CameraDeviceClientBase::CameraDeviceClientBase(
         const sp<CameraService>& cameraService,
         const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
-        const String16& clientPackageName,
+        const std::string& clientPackageName,
         bool systemNativeClient,
-        const std::optional<String16>& clientFeatureId,
-        const String8& cameraId,
+        const std::optional<std::string>& clientFeatureId,
+        const std::string& cameraId,
         [[maybe_unused]] int api1CameraId,
         int cameraFacing,
         int sensorOrientation,
@@ -88,10 +89,10 @@
 CameraDeviceClient::CameraDeviceClient(const sp<CameraService>& cameraService,
         const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
         std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
-        const String16& clientPackageName,
+        const std::string& clientPackageName,
         bool systemNativeClient,
-        const std::optional<String16>& clientFeatureId,
-        const String8& cameraId,
+        const std::optional<std::string>& clientFeatureId,
+        const std::string& cameraId,
         int cameraFacing,
         int sensorOrientation,
         int clientPid,
@@ -109,16 +110,17 @@
     mOverrideForPerfClass(overrideForPerfClass) {
 
     ATRACE_CALL();
-    ALOGI("CameraDeviceClient %s: Opened", cameraId.string());
+    ALOGI("CameraDeviceClient %s: Opened", cameraId.c_str());
 }
 
 status_t CameraDeviceClient::initialize(sp<CameraProviderManager> manager,
-        const String8& monitorTags) {
+        const std::string& monitorTags) {
     return initializeImpl(manager, monitorTags);
 }
 
 template<typename TProviderPtr>
-status_t CameraDeviceClient::initializeImpl(TProviderPtr providerPtr, const String8& monitorTags) {
+status_t CameraDeviceClient::initializeImpl(TProviderPtr providerPtr,
+        const std::string& monitorTags) {
     ATRACE_CALL();
     status_t res;
 
@@ -127,10 +129,9 @@
         return res;
     }
 
-    String8 threadName;
     mFrameProcessor = new FrameProcessorBase(mDevice);
-    threadName = String8::format("CDU-%s-FrameProc", mCameraIdStr.string());
-    res = mFrameProcessor->run(threadName.string());
+    std::string threadName = std::string("CDU-") + mCameraIdStr + "-FrameProc";
+    res = mFrameProcessor->run(threadName.c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start frame processor thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -188,13 +189,13 @@
     mProviderManager = providerPtr;
     // Cache physical camera ids corresponding to this device and also the high
     // resolution sensors in this device + physical camera ids
-    mProviderManager->isLogicalCamera(mCameraIdStr.string(), &mPhysicalCameraIds);
+    mProviderManager->isLogicalCamera(mCameraIdStr, &mPhysicalCameraIds);
     if (supportsUltraHighResolutionCapture(mCameraIdStr)) {
-        mHighResolutionSensors.insert(mCameraIdStr.string());
+        mHighResolutionSensors.insert(mCameraIdStr);
     }
     for (auto &physicalId : mPhysicalCameraIds) {
-        if (supportsUltraHighResolutionCapture(String8(physicalId.c_str()))) {
-            mHighResolutionSensors.insert(physicalId.c_str());
+        if (supportsUltraHighResolutionCapture(physicalId)) {
+            mHighResolutionSensors.insert(physicalId);
         }
     }
     return OK;
@@ -222,7 +223,7 @@
     if (idx == NAME_NOT_FOUND) {
         ALOGE("%s: Camera %s: Tried to submit a request with a surface that"
                 " we have not called createStream on",
-                __FUNCTION__, mCameraIdStr.string());
+                __FUNCTION__, mCameraIdStr.c_str());
         return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Request targets Surface that is not part of current capture session");
     } else if ((compositeIdx = mCompositeStreamMap.indexOfKey(IInterface::asBinder(gbp)))
@@ -239,7 +240,7 @@
     (*outSurfaceMap)[streamSurfaceId.streamId()].push_back(streamSurfaceId.surfaceId());
 
     ALOGV("%s: Camera %s: Appending output stream %d surface %d to request",
-            __FUNCTION__, mCameraIdStr.string(), streamSurfaceId.streamId(),
+            __FUNCTION__, mCameraIdStr.c_str(), streamSurfaceId.streamId(),
             streamSurfaceId.surfaceId());
 
     if (currentStreamId != nullptr) {
@@ -282,7 +283,7 @@
 
     if (requests.empty()) {
         ALOGE("%s: Camera %s: Sent null request. Rejecting request.",
-              __FUNCTION__, mCameraIdStr.string());
+              __FUNCTION__, mCameraIdStr.c_str());
         return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, "Empty request list");
     }
 
@@ -295,19 +296,19 @@
         if (request.mIsReprocess) {
             if (!mInputStream.configured) {
                 ALOGE("%s: Camera %s: no input stream is configured.", __FUNCTION__,
-                        mCameraIdStr.string());
+                        mCameraIdStr.c_str());
                 return STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                         "No input configured for camera %s but request is for reprocessing",
-                        mCameraIdStr.string());
+                        mCameraIdStr.c_str());
             } else if (streaming) {
                 ALOGE("%s: Camera %s: streaming reprocess requests not supported.", __FUNCTION__,
-                        mCameraIdStr.string());
+                        mCameraIdStr.c_str());
                 return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                         "Repeating reprocess requests not supported");
             } else if (request.mPhysicalCameraSettings.size() > 1) {
                 ALOGE("%s: Camera %s: reprocess requests not supported for "
                         "multiple physical cameras.", __FUNCTION__,
-                        mCameraIdStr.string());
+                        mCameraIdStr.c_str());
                 return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                         "Reprocess requests not supported for multiple cameras");
             }
@@ -315,23 +316,23 @@
 
         if (request.mPhysicalCameraSettings.empty()) {
             ALOGE("%s: Camera %s: request doesn't contain any settings.", __FUNCTION__,
-                    mCameraIdStr.string());
+                    mCameraIdStr.c_str());
             return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                     "Request doesn't contain any settings");
         }
 
         //The first capture settings should always match the logical camera id
-        String8 logicalId(request.mPhysicalCameraSettings.begin()->id.c_str());
+        const std::string &logicalId = request.mPhysicalCameraSettings.begin()->id;
         if (mDevice->getId() != logicalId) {
             ALOGE("%s: Camera %s: Invalid camera request settings.", __FUNCTION__,
-                    mCameraIdStr.string());
+                    mCameraIdStr.c_str());
             return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                     "Invalid camera request settings");
         }
 
         if (request.mSurfaceList.isEmpty() && request.mStreamIdxList.size() == 0) {
             ALOGE("%s: Camera %s: Requests must have at least one surface target. "
-                    "Rejecting request.", __FUNCTION__, mCameraIdStr.string());
+                    "Rejecting request.", __FUNCTION__, mCameraIdStr.c_str());
             return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                     "Request has no output targets");
         }
@@ -357,9 +358,9 @@
 
                 ssize_t index = mConfiguredOutputs.indexOfKey(streamId);
                 if (index >= 0) {
-                    String8 requestedPhysicalId(
-                            mConfiguredOutputs.valueAt(index).getPhysicalCameraId());
-                    requestedPhysicalIds.push_back(requestedPhysicalId.string());
+                    const std::string &requestedPhysicalId =
+                            mConfiguredOutputs.valueAt(index).getPhysicalCameraId();
+                    requestedPhysicalIds.push_back(requestedPhysicalId);
                     dynamicProfileBitmap |=
                             mConfiguredOutputs.valueAt(index).getDynamicRangeProfile();
                 } else {
@@ -375,7 +376,7 @@
                 if (index < 0) {
                     ALOGE("%s: Camera %s: Tried to submit a request with a surface that"
                             " we have not called createStream on: stream %d",
-                            __FUNCTION__, mCameraIdStr.string(), streamId);
+                            __FUNCTION__, mCameraIdStr.c_str(), streamId);
                     return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                             "Request targets Surface that is not part of current capture session");
                 }
@@ -384,7 +385,7 @@
                 if ((size_t)surfaceIdx >= gbps.size()) {
                     ALOGE("%s: Camera %s: Tried to submit a request with a surface that"
                             " we have not called createStream on: stream %d, surfaceIdx %d",
-                            __FUNCTION__, mCameraIdStr.string(), streamId, surfaceIdx);
+                            __FUNCTION__, mCameraIdStr.c_str(), streamId, surfaceIdx);
                     return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                             "Request targets Surface has invalid surface index");
                 }
@@ -394,9 +395,9 @@
                     return res;
                 }
 
-                String8 requestedPhysicalId(
-                        mConfiguredOutputs.valueAt(index).getPhysicalCameraId());
-                requestedPhysicalIds.push_back(requestedPhysicalId.string());
+                const std::string &requestedPhysicalId =
+                        mConfiguredOutputs.valueAt(index).getPhysicalCameraId();
+                requestedPhysicalIds.push_back(requestedPhysicalId);
                 dynamicProfileBitmap |=
                         mConfiguredOutputs.valueAt(index).getDynamicRangeProfile();
             }
@@ -418,7 +419,7 @@
                     } else {
                         ALOGE("%s: Camera %s: Tried to submit a request with a surfaces that"
                                 " reference an unsupported dynamic range profile combination"
-                                " 0x%" PRIx64 "!", __FUNCTION__, mCameraIdStr.string(),
+                                " 0x%" PRIx64 "!", __FUNCTION__, mCameraIdStr.c_str(),
                                 dynamicProfileBitmap);
                         return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                                 "Request targets an unsupported dynamic range profile"
@@ -427,7 +428,7 @@
                 } else {
                     ALOGE("%s: Camera %s: Tried to submit a request with a surface that"
                             " references unsupported dynamic range profile 0x%x!",
-                            __FUNCTION__, mCameraIdStr.string(), i);
+                            __FUNCTION__, mCameraIdStr.c_str(), i);
                     return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                             "Request targets 10-bit Surface with unsupported dynamic range"
                             " profile");
@@ -439,7 +440,7 @@
         for (const auto& it : request.mPhysicalCameraSettings) {
             if (it.settings.isEmpty()) {
                 ALOGE("%s: Camera %s: Sent empty metadata packet. Rejecting request.",
-                        __FUNCTION__, mCameraIdStr.string());
+                        __FUNCTION__, mCameraIdStr.c_str());
                 return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                         "Request settings are empty");
             }
@@ -462,7 +463,7 @@
                 }
             }
 
-            String8 physicalId(it.id.c_str());
+            const std::string &physicalId = it.id;
             bool hasTestPatternModePhysicalKey = std::find(mSupportedPhysicalRequestKeys.begin(),
                     mSupportedPhysicalRequestKeys.end(), ANDROID_SENSOR_TEST_PATTERN_MODE) !=
                     mSupportedPhysicalRequestKeys.end();
@@ -474,7 +475,7 @@
                         it.id);
                 if (found == requestedPhysicalIds.end()) {
                     ALOGE("%s: Camera %s: Physical camera id: %s not part of attached outputs.",
-                            __FUNCTION__, mCameraIdStr.string(), physicalId.string());
+                            __FUNCTION__, mCameraIdStr.c_str(), physicalId.c_str());
                     return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
                             "Invalid physical camera id");
                 }
@@ -520,7 +521,7 @@
                 &(submitInfo->mRequestId), /*size*/1);
         loopCounter++; // loopCounter starts from 1
         ALOGV("%s: Camera %s: Creating request with ID %d (%d of %zu)",
-                __FUNCTION__, mCameraIdStr.string(), submitInfo->mRequestId,
+                __FUNCTION__, mCameraIdStr.c_str(), submitInfo->mRequestId,
                 loopCounter, requests.size());
 
         metadataRequestList.push_back(physicalSettingsList);
@@ -543,12 +544,12 @@
         err = mDevice->setStreamingRequestList(metadataRequestList, surfaceMapList,
                 &(submitInfo->mLastFrameNumber));
         if (err != OK) {
-            String8 msg = String8::format(
+            std::string msg = fmt::sprintf(
                 "Camera %s:  Got error %s (%d) after trying to set streaming request",
-                mCameraIdStr.string(), strerror(-err), err);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
+                mCameraIdStr.c_str(), strerror(-err), err);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
             res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION,
-                    msg.string());
+                    msg.c_str());
         } else {
             Mutex::Autolock idLock(mStreamingRequestIdLock);
             mStreamingRequestId = submitInfo->mRequestId;
@@ -557,17 +558,17 @@
         err = mDevice->captureList(metadataRequestList, surfaceMapList,
                 &(submitInfo->mLastFrameNumber));
         if (err != OK) {
-            String8 msg = String8::format(
+            std::string msg = fmt::sprintf(
                 "Camera %s: Got error %s (%d) after trying to submit capture request",
-                mCameraIdStr.string(), strerror(-err), err);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
+                mCameraIdStr.c_str(), strerror(-err), err);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
             res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION,
-                    msg.string());
+                    msg.c_str());
         }
         ALOGV("%s: requestId = %d ", __FUNCTION__, submitInfo->mRequestId);
     }
 
-    ALOGV("%s: Camera %s: End of function", __FUNCTION__, mCameraIdStr.string());
+    ALOGV("%s: Camera %s: End of function", __FUNCTION__, mCameraIdStr.c_str());
     return res;
 }
 
@@ -591,22 +592,22 @@
 
     Mutex::Autolock idLock(mStreamingRequestIdLock);
     if (mStreamingRequestId != requestId) {
-        String8 msg = String8::format("Camera %s: Canceling request ID %d doesn't match "
-                "current request ID %d", mCameraIdStr.string(), requestId, mStreamingRequestId);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Canceling request ID %d doesn't match "
+                "current request ID %d", mCameraIdStr.c_str(), requestId, mStreamingRequestId);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     err = mDevice->clearStreamingRequest(lastFrameNumber);
 
     if (err == OK) {
         ALOGV("%s: Camera %s: Successfully cleared streaming request",
-                __FUNCTION__, mCameraIdStr.string());
+                __FUNCTION__, mCameraIdStr.c_str());
         mStreamingRequestId = REQUEST_ID_NONE;
     } else {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error clearing streaming request: %s (%d)",
-                mCameraIdStr.string(), strerror(-err), err);
+                mCameraIdStr.c_str(), strerror(-err), err);
     }
 
     return res;
@@ -631,9 +632,9 @@
     if (!(res = checkPidStatus(__FUNCTION__)).isOk()) return res;
 
     if (offlineStreamIds == nullptr) {
-        String8 msg = String8::format("Invalid offline stream ids");
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = "Invalid offline stream ids";
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     Mutex::Autolock icl(mBinderSerializationLock);
@@ -650,15 +651,15 @@
 
     status_t err = mDevice->configureStreams(sessionParams, operatingMode);
     if (err == BAD_VALUE) {
-        String8 msg = String8::format("Camera %s: Unsupported set of inputs/outputs provided",
-                mCameraIdStr.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        res = STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Unsupported set of inputs/outputs provided",
+                mCameraIdStr.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        res = STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     } else if (err != OK) {
-        String8 msg = String8::format("Camera %s: Error configuring streams: %s (%d)",
-                mCameraIdStr.string(), strerror(-err), err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Error configuring streams: %s (%d)",
+                mCameraIdStr.c_str(), strerror(-err), err);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     } else {
         offlineStreamIds->clear();
         mDevice->getOfflineStreamIds(offlineStreamIds);
@@ -667,10 +668,10 @@
         for (size_t i = 0; i < mCompositeStreamMap.size(); ++i) {
             err = mCompositeStreamMap.valueAt(i)->configureStream();
             if (err != OK) {
-                String8 msg = String8::format("Camera %s: Error configuring composite "
-                        "streams: %s (%d)", mCameraIdStr.string(), strerror(-err), err);
-                ALOGE("%s: %s", __FUNCTION__, msg.string());
-                res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+                std::string msg = fmt::sprintf("Camera %s: Error configuring composite "
+                        "streams: %s (%d)", mCameraIdStr.c_str(), strerror(-err), err);
+                ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+                res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
                 break;
             }
 
@@ -729,35 +730,36 @@
     }
 
     if (status == nullptr) {
-        String8 msg = String8::format( "Camera %s: Invalid status!", mCameraIdStr.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf( "Camera %s: Invalid status!", mCameraIdStr.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     *status = false;
-    camera3::metadataGetter getMetadata = [this](const String8 &id, bool /*overrideForPerfClass*/) {
+    camera3::metadataGetter getMetadata = [this](const std::string &id,
+            bool /*overrideForPerfClass*/) {
           return mDevice->infoPhysical(id);};
-    ret = mProviderManager->isSessionConfigurationSupported(mCameraIdStr.string(),
+    ret = mProviderManager->isSessionConfigurationSupported(mCameraIdStr.c_str(),
             sessionConfiguration, mOverrideForPerfClass, getMetadata, status);
     switch (ret) {
         case OK:
             // Expected, do nothing.
             break;
         case INVALID_OPERATION: {
-                String8 msg = String8::format(
+                std::string msg = fmt::sprintf(
                         "Camera %s: Session configuration query not supported!",
-                        mCameraIdStr.string());
-                ALOGD("%s: %s", __FUNCTION__, msg.string());
-                res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+                        mCameraIdStr.c_str());
+                ALOGD("%s: %s", __FUNCTION__, msg.c_str());
+                res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
             }
 
             break;
         default: {
-                String8 msg = String8::format( "Camera %s: Error: %s (%d)", mCameraIdStr.string(),
+                std::string msg = fmt::sprintf( "Camera %s: Error: %s (%d)", mCameraIdStr.c_str(),
                         strerror(-ret), ret);
-                ALOGE("%s: %s", __FUNCTION__, msg.string());
+                ALOGE("%s: %s", __FUNCTION__, msg.c_str());
                 res = STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
-                        msg.string());
+                        msg.c_str());
             }
     }
 
@@ -809,10 +811,10 @@
         }
 
         if (surfaces.empty() && dIndex == NAME_NOT_FOUND) {
-            String8 msg = String8::format("Camera %s: Invalid stream ID (%d) specified, no such"
-                    " stream created yet", mCameraIdStr.string(), streamId);
-            ALOGW("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+            std::string msg = fmt::sprintf("Camera %s: Invalid stream ID (%d) specified, no such"
+                    " stream created yet", mCameraIdStr.c_str(), streamId);
+            ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
     }
 
@@ -820,10 +822,10 @@
     status_t err = mDevice->deleteStream(streamId);
 
     if (err != OK) {
-        String8 msg = String8::format("Camera %s: Unexpected error %s (%d) when deleting stream %d",
-                mCameraIdStr.string(), strerror(-err), err, streamId);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Unexpected error %s (%d) when deleting stream "
+                "%d", mCameraIdStr.c_str(), strerror(-err), err, streamId);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     } else {
         if (isInput) {
             mInputStream.configured = false;
@@ -843,11 +845,11 @@
                 status_t ret;
                 if ((ret = mCompositeStreamMap.valueAt(compositeIndex)->deleteStream())
                         != OK) {
-                    String8 msg = String8::format("Camera %s: Unexpected error %s (%d) when "
-                            "deleting composite stream %d", mCameraIdStr.string(), strerror(-err), err,
-                            streamId);
-                    ALOGE("%s: %s", __FUNCTION__, msg.string());
-                    res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+                    std::string msg = fmt::sprintf("Camera %s: Unexpected error %s (%d) when "
+                            "deleting composite stream %d", mCameraIdStr.c_str(), strerror(-err),
+                            err, streamId);
+                    ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+                    res = STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
                 }
                 mCompositeStreamMap.removeItemsAt(compositeIndex);
             }
@@ -880,7 +882,7 @@
     size_t numBufferProducers = bufferProducers.size();
     bool deferredConsumer = outputConfiguration.isDeferred();
     bool isShared = outputConfiguration.isShared();
-    String8 physicalCameraId = String8(outputConfiguration.getPhysicalCameraId());
+    const std::string &physicalCameraId = outputConfiguration.getPhysicalCameraId();
     bool deferredConsumerOnly = deferredConsumer && numBufferProducers == 0;
     bool isMultiResolution = outputConfiguration.isMultiResolution();
     int64_t dynamicRangeProfile = outputConfiguration.getDynamicRangeProfile();
@@ -923,10 +925,11 @@
         sp<IBinder> binder = IInterface::asBinder(bufferProducer);
         ssize_t index = mStreamMap.indexOfKey(binder);
         if (index != NAME_NOT_FOUND) {
-            String8 msg = String8::format("Camera %s: Surface already has a stream created for it "
-                    "(ID %zd)", mCameraIdStr.string(), index);
-            ALOGW("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ALREADY_EXISTS, msg.string());
+            std::string msg = std::string("Camera ") + mCameraIdStr
+                    + ": Surface already has a stream created for it (ID "
+                    + std::to_string(index) + ")";
+            ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ALREADY_EXISTS, msg.c_str());
         }
 
         sp<Surface> surface;
@@ -994,7 +997,7 @@
     if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error creating output stream (%d x %d, fmt %x, dataSpace %x): %s (%d)",
-                mCameraIdStr.string(), streamInfo.width, streamInfo.height, streamInfo.format,
+                mCameraIdStr.c_str(), streamInfo.width, streamInfo.height, streamInfo.format,
                 streamInfo.dataSpace, strerror(-err), err);
     } else {
         int i = 0;
@@ -1010,20 +1013,19 @@
 
         ALOGV("%s: Camera %s: Successfully created a new stream ID %d for output surface"
                     " (%d x %d) with format 0x%x.",
-                  __FUNCTION__, mCameraIdStr.string(), streamId, streamInfo.width,
+                  __FUNCTION__, mCameraIdStr.c_str(), streamId, streamInfo.width,
                   streamInfo.height, streamInfo.format);
 
         // Set transform flags to ensure preview to be rotated correctly.
         res = setStreamTransformLocked(streamId, streamInfo.mirrorMode);
 
         // Fill in mHighResolutionCameraIdToStreamIdSet map
-        const String8 &cameraIdUsed =
+        const std::string &cameraIdUsed =
                 physicalCameraId.size() != 0 ? physicalCameraId : mCameraIdStr;
-        const char *cameraIdUsedCStr = cameraIdUsed.string();
         // Only needed for high resolution sensors
-        if (mHighResolutionSensors.find(cameraIdUsedCStr) !=
+        if (mHighResolutionSensors.find(cameraIdUsed) !=
                 mHighResolutionSensors.end()) {
-            mHighResolutionCameraIdToStreamIdSet[cameraIdUsedCStr].insert(streamId);
+            mHighResolutionCameraIdToStreamIdSet[cameraIdUsed].insert(streamId);
         }
 
         *newStreamId = streamId;
@@ -1063,8 +1065,8 @@
     int streamId = camera3::CAMERA3_STREAM_ID_INVALID;
     std::vector<sp<Surface>> noSurface;
     std::vector<int> surfaceIds;
-    String8 physicalCameraId(outputConfiguration.getPhysicalCameraId());
-    const String8 &cameraIdUsed =
+    const std::string &physicalCameraId = outputConfiguration.getPhysicalCameraId();
+    const std::string &cameraIdUsed =
             physicalCameraId.size() != 0 ? physicalCameraId : mCameraIdStr;
     // Here, we override sensor pixel modes
     std::unordered_set<int32_t> overriddenSensorPixelModesUsed;
@@ -1093,7 +1095,7 @@
     if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error creating output stream (%d x %d, fmt %x, dataSpace %x): %s (%d)",
-                mCameraIdStr.string(), width, height, format, dataSpace, strerror(-err), err);
+                mCameraIdStr.c_str(), width, height, format, dataSpace, strerror(-err), err);
     } else {
         // Can not add streamId to mStreamMap here, as the surface is deferred. Add it to
         // a separate list to track. Once the deferred surface is set, this id will be
@@ -1110,18 +1112,17 @@
 
         ALOGV("%s: Camera %s: Successfully created a new stream ID %d for a deferred surface"
                 " (%d x %d) stream with format 0x%x.",
-              __FUNCTION__, mCameraIdStr.string(), streamId, width, height, format);
+              __FUNCTION__, mCameraIdStr.c_str(), streamId, width, height, format);
 
         // Set transform flags to ensure preview to be rotated correctly.
         res = setStreamTransformLocked(streamId, outputConfiguration.getMirrorMode());
 
         *newStreamId = streamId;
         // Fill in mHighResolutionCameraIdToStreamIdSet
-        const char *cameraIdUsedCStr = cameraIdUsed.string();
         // Only needed for high resolution sensors
-        if (mHighResolutionSensors.find(cameraIdUsedCStr) !=
+        if (mHighResolutionSensors.find(cameraIdUsed) !=
                 mHighResolutionSensors.end()) {
-            mHighResolutionCameraIdToStreamIdSet[cameraIdUsed.string()].insert(streamId);
+            mHighResolutionCameraIdToStreamIdSet[cameraIdUsed].insert(streamId);
         }
     }
     return res;
@@ -1145,10 +1146,10 @@
 
     err = mDevice->setStreamTransform(streamId, transform);
     if (err != OK) {
-        String8 msg = String8::format("Failed to set stream transform (stream id %d)",
+        std::string msg = fmt::sprintf("Failed to set stream transform (stream id %d)",
                 streamId);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
 
     return res;
@@ -1173,10 +1174,10 @@
     }
 
     if (mInputStream.configured) {
-        String8 msg = String8::format("Camera %s: Already has an input stream "
-                "configured (ID %d)", mCameraIdStr.string(), mInputStream.id);
-        ALOGE("%s: %s", __FUNCTION__, msg.string() );
-        return STATUS_ERROR(CameraService::ERROR_ALREADY_EXISTS, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Already has an input stream "
+                "configured (ID %d)", mCameraIdStr.c_str(), mInputStream.id);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str() );
+        return STATUS_ERROR(CameraService::ERROR_ALREADY_EXISTS, msg.c_str());
     }
 
     int streamId = -1;
@@ -1189,12 +1190,12 @@
         mInputStream.id = streamId;
 
         ALOGV("%s: Camera %s: Successfully created a new input stream ID %d",
-                __FUNCTION__, mCameraIdStr.string(), streamId);
+                __FUNCTION__, mCameraIdStr.c_str(), streamId);
 
         *newStreamId = streamId;
     } else {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
-                "Camera %s: Error creating new input stream: %s (%d)", mCameraIdStr.string(),
+                "Camera %s: Error creating new input stream: %s (%d)", mCameraIdStr.c_str(),
                 strerror(-err), err);
     }
 
@@ -1219,9 +1220,9 @@
     if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error getting input Surface: %s (%d)",
-                mCameraIdStr.string(), strerror(-err), err);
+                mCameraIdStr.c_str(), strerror(-err), err);
     } else {
-        inputSurface->name = String16("CameraInput");
+        inputSurface->name = toString16("CameraInput");
         inputSurface->graphicBufferProducer = producer;
     }
     return res;
@@ -1242,7 +1243,7 @@
 
     const std::vector<sp<IGraphicBufferProducer> >& bufferProducers =
             outputConfiguration.getGraphicBufferProducers();
-    String8 physicalCameraId(outputConfiguration.getPhysicalCameraId());
+    const std::string &physicalCameraId = outputConfiguration.getPhysicalCameraId();
 
     auto producerCount = bufferProducers.size();
     if (producerCount == 0) {
@@ -1329,12 +1330,12 @@
             case -EBUSY:
                 res = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                         "Camera %s: Error updating stream: %s (%d)",
-                        mCameraIdStr.string(), strerror(ret), ret);
+                        mCameraIdStr.c_str(), strerror(ret), ret);
                 break;
             default:
                 res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                         "Camera %s: Error updating stream: %s (%d)",
-                        mCameraIdStr.string(), strerror(ret), ret);
+                        mCameraIdStr.c_str(), strerror(ret), ret);
                 break;
         }
     } else {
@@ -1350,7 +1351,7 @@
         mConfiguredOutputs.replaceValueFor(streamId, outputConfiguration);
 
         ALOGV("%s: Camera %s: Successful stream ID %d update",
-                  __FUNCTION__, mCameraIdStr.string(), streamId);
+                  __FUNCTION__, mCameraIdStr.c_str(), streamId);
     }
 
     return res;
@@ -1385,12 +1386,12 @@
     } else if (err == BAD_VALUE) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Camera %s: Template ID %d is invalid or not supported: %s (%d)",
-                mCameraIdStr.string(), templateId, strerror(-err), err);
+                mCameraIdStr.c_str(), templateId, strerror(-err), err);
 
     } else {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error creating default request for template %d: %s (%d)",
-                mCameraIdStr.string(), templateId, strerror(-err), err);
+                mCameraIdStr.c_str(), templateId, strerror(-err), err);
     }
     return res;
 }
@@ -1437,17 +1438,17 @@
     // FIXME: Also need check repeating burst.
     Mutex::Autolock idLock(mStreamingRequestIdLock);
     if (mStreamingRequestId != REQUEST_ID_NONE) {
-        String8 msg = String8::format(
+        std::string msg = fmt::sprintf(
             "Camera %s: Try to waitUntilIdle when there are active streaming requests",
-            mCameraIdStr.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+            mCameraIdStr.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
     status_t err = mDevice->waitUntilDrained();
     if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error waiting to drain: %s (%d)",
-                mCameraIdStr.string(), strerror(-err), err);
+                mCameraIdStr.c_str(), strerror(-err), err);
     }
     ALOGV("%s Done", __FUNCTION__);
     return res;
@@ -1473,7 +1474,8 @@
     status_t err = mDevice->flush(lastFrameNumber);
     if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
-                "Camera %s: Error flushing device: %s (%d)", mCameraIdStr.string(), strerror(-err), err);
+                "Camera %s: Error flushing device: %s (%d)", mCameraIdStr.c_str(), strerror(-err),
+                err);
     }
     return res;
 }
@@ -1497,10 +1499,10 @@
     }
 
     if (index == NAME_NOT_FOUND) {
-        String8 msg = String8::format("Camera %s: Invalid stream ID (%d) specified, no stream "
-              "with that ID exists", mCameraIdStr.string(), streamId);
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Invalid stream ID (%d) specified, no stream "
+              "with that ID exists", mCameraIdStr.c_str(), streamId);
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     // Also returns BAD_VALUE if stream ID was not valid, or stream already
@@ -1509,10 +1511,10 @@
     if (err == BAD_VALUE) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Camera %s: Stream %d has already been used, and cannot be prepared",
-                mCameraIdStr.string(), streamId);
+                mCameraIdStr.c_str(), streamId);
     } else if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
-                "Camera %s: Error preparing stream %d: %s (%d)", mCameraIdStr.string(), streamId,
+                "Camera %s: Error preparing stream %d: %s (%d)", mCameraIdStr.c_str(), streamId,
                 strerror(-err), err);
     }
     return res;
@@ -1537,17 +1539,17 @@
     }
 
     if (index == NAME_NOT_FOUND) {
-        String8 msg = String8::format("Camera %s: Invalid stream ID (%d) specified, no stream "
-              "with that ID exists", mCameraIdStr.string(), streamId);
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Invalid stream ID (%d) specified, no stream "
+              "with that ID exists", mCameraIdStr.c_str(), streamId);
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     if (maxCount <= 0) {
-        String8 msg = String8::format("Camera %s: maxCount (%d) must be greater than 0",
-                mCameraIdStr.string(), maxCount);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: maxCount (%d) must be greater than 0",
+                mCameraIdStr.c_str(), maxCount);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     // Also returns BAD_VALUE if stream ID was not valid, or stream already
@@ -1556,10 +1558,10 @@
     if (err == BAD_VALUE) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Camera %s: Stream %d has already been used, and cannot be prepared",
-                mCameraIdStr.string(), streamId);
+                mCameraIdStr.c_str(), streamId);
     } else if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
-                "Camera %s: Error preparing stream %d: %s (%d)", mCameraIdStr.string(), streamId,
+                "Camera %s: Error preparing stream %d: %s (%d)", mCameraIdStr.c_str(), streamId,
                 strerror(-err), err);
     }
 
@@ -1585,10 +1587,10 @@
     }
 
     if (index == NAME_NOT_FOUND) {
-        String8 msg = String8::format("Camera %s: Invalid stream ID (%d) specified, no stream "
-              "with that ID exists", mCameraIdStr.string(), streamId);
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Invalid stream ID (%d) specified, no stream "
+              "with that ID exists", mCameraIdStr.c_str(), streamId);
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     // Also returns BAD_VALUE if stream ID was not valid or if the stream is in
@@ -1597,10 +1599,10 @@
     if (err == BAD_VALUE) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Camera %s: Stream %d is still in use, cannot be torn down",
-                mCameraIdStr.string(), streamId);
+                mCameraIdStr.c_str(), streamId);
     } else if (err != OK) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
-                "Camera %s: Error tearing down stream %d: %s (%d)", mCameraIdStr.string(), streamId,
+                "Camera %s: Error tearing down stream %d: %s (%d)", mCameraIdStr.c_str(), streamId,
                 strerror(-err), err);
     }
 
@@ -1618,7 +1620,7 @@
 
     const std::vector<sp<IGraphicBufferProducer> >& bufferProducers =
             outputConfiguration.getGraphicBufferProducers();
-    String8 physicalId(outputConfiguration.getPhysicalCameraId());
+    const std::string &physicalId = outputConfiguration.getPhysicalCameraId();
 
     if (bufferProducers.size() == 0) {
         ALOGE("%s: bufferProducers must not be empty", __FUNCTION__);
@@ -1643,17 +1645,17 @@
 
     }
     if (deferredStreamIndex == NAME_NOT_FOUND && !streamIdConfigured) {
-        String8 msg = String8::format("Camera %s: deferred surface is set to a unknown stream"
-                "(ID %d)", mCameraIdStr.string(), streamId);
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: deferred surface is set to a unknown stream"
+                "(ID %d)", mCameraIdStr.c_str(), streamId);
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     if (mStreamInfoMap[streamId].finalized) {
-        String8 msg = String8::format("Camera %s: finalizeOutputConfigurations has been called"
-                " on stream ID %d", mCameraIdStr.string(), streamId);
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: finalizeOutputConfigurations has been called"
+                " on stream ID %d", mCameraIdStr.c_str(), streamId);
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     if (!mDevice.get()) {
@@ -1673,7 +1675,7 @@
         ssize_t index = mStreamMap.indexOfKey(IInterface::asBinder(bufferProducer));
         if (index != NAME_NOT_FOUND) {
             ALOGV("Camera %s: Surface already has a stream created "
-                    " for it (ID %zd)", mCameraIdStr.string(), index);
+                    " for it (ID %zd)", mCameraIdStr.c_str(), index);
             continue;
         }
 
@@ -1716,11 +1718,11 @@
     } else if (err == NO_INIT) {
         res = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Camera %s: Deferred surface is invalid: %s (%d)",
-                mCameraIdStr.string(), strerror(-err), err);
+                mCameraIdStr.c_str(), strerror(-err), err);
     } else {
         res = STATUS_ERROR_FMT(CameraService::ERROR_INVALID_OPERATION,
                 "Camera %s: Error setting output stream deferred surface: %s (%d)",
-                mCameraIdStr.string(), strerror(-err), err);
+                mCameraIdStr.c_str(), strerror(-err), err);
     }
 
     return res;
@@ -1732,10 +1734,10 @@
     if (!(res = checkPidStatus(__FUNCTION__)).isOk()) return res;
 
     if (!isValidAudioRestriction(mode)) {
-        String8 msg = String8::format("Camera %s: invalid audio restriction mode %d",
-                mCameraIdStr.string(), mode);
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: invalid audio restriction mode %d",
+                mCameraIdStr.c_str(), mode);
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     Mutex::Autolock icl(mBinderSerializationLock);
@@ -1814,15 +1816,15 @@
     }
 
     if (offlineOutputIds.empty()) {
-        String8 msg = String8::format("Offline surfaces must not be empty");
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = "Offline surfaces must not be empty";
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     if (session == nullptr) {
-        String8 msg = String8::format("Invalid offline session");
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = "Invalid offline session";
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     std::vector<int32_t> offlineStreamIds;
@@ -1831,17 +1833,17 @@
     for (const auto& streamId : offlineOutputIds) {
         ssize_t index = mConfiguredOutputs.indexOfKey(streamId);
         if (index == NAME_NOT_FOUND) {
-            String8 msg = String8::format("Offline surface with id: %d is not registered",
+            std::string msg = fmt::sprintf("Offline surface with id: %d is not registered",
                     streamId);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
 
         if (!mStreamInfoMap[streamId].supportsOffline) {
-            String8 msg = String8::format("Offline surface with id: %d doesn't support "
+            std::string msg = fmt::sprintf("Offline surface with id: %d doesn't support "
                     "offline mode", streamId);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
 
         Mutex::Autolock l(mCompositeLock);
@@ -1878,7 +1880,7 @@
     if (ret != OK) {
         return STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                 "Camera %s: Error switching to offline mode: %s (%d)",
-                mCameraIdStr.string(), strerror(ret), ret);
+                mCameraIdStr.c_str(), strerror(ret), ret);
     }
 
     sp<CameraOfflineSessionClient> offlineClient;
@@ -1903,7 +1905,7 @@
     } else {
         // In case we failed to register the offline client, ensure that it still initialized
         // so that all failing requests can return back correctly once the object is released.
-        offlineClient->initialize(nullptr /*cameraProviderManager*/, String8()/*monitorTags*/);
+        offlineClient->initialize(nullptr /*cameraProviderManager*/, std::string()/*monitorTags*/);
 
         switch(ret) {
             case BAD_VALUE:
@@ -1930,7 +1932,7 @@
 
 status_t CameraDeviceClient::dumpClient(int fd, const Vector<String16>& args) {
     dprintf(fd, "  CameraDeviceClient[%s] (%p) dump:\n",
-            mCameraIdStr.string(),
+            mCameraIdStr.c_str(),
             (getRemoteCallback() != NULL ?
                     IInterface::asBinder(getRemoteCallback()).get() : NULL) );
     dprintf(fd, "    Current client UID %u\n", mClientUid);
@@ -1963,7 +1965,7 @@
     return dumpDevice(fd, args);
 }
 
-status_t CameraDeviceClient::startWatchingTags(const String8 &tags, int out) {
+status_t CameraDeviceClient::startWatchingTags(const std::string &tags, int out) {
     sp<CameraDeviceBase> device = mDevice;
     if (!device) {
         dprintf(out, "  Device is detached.");
@@ -2087,16 +2089,16 @@
     if (mDevice == 0) return;
 
     nsecs_t startTime = systemTime();
-    ALOGV("Camera %s: Stopping processors", mCameraIdStr.string());
+    ALOGV("Camera %s: Stopping processors", mCameraIdStr.c_str());
 
     if (mFrameProcessor.get() != nullptr) {
         mFrameProcessor->removeListener(
                 camera2::FrameProcessorBase::FRAME_PROCESSOR_LISTENER_MIN_ID,
                 camera2::FrameProcessorBase::FRAME_PROCESSOR_LISTENER_MAX_ID, /*listener*/this);
         mFrameProcessor->requestExit();
-        ALOGV("Camera %s: Waiting for threads", mCameraIdStr.string());
+        ALOGV("Camera %s: Waiting for threads", mCameraIdStr.c_str());
         mFrameProcessor->join();
-        ALOGV("Camera %s: Disconnecting device", mCameraIdStr.string());
+        ALOGV("Camera %s: Disconnecting device", mCameraIdStr.c_str());
     }
 
     // WORKAROUND: HAL refuses to disconnect while there's streams in flight
@@ -2202,7 +2204,7 @@
     entry = metadata.find(ANDROID_LED_TRANSMIT);
     if (entry.count > 0 && entry.data.u8[0] != ANDROID_LED_TRANSMIT_ON) {
         String16 permissionString =
-            String16("android.permission.CAMERA_DISABLE_TRANSMIT_LED");
+            toString16("android.permission.CAMERA_DISABLE_TRANSMIT_LED");
         if (!checkCallingPermission(permissionString)) {
             const int uid = CameraThreadState::getCallingUid();
             ALOGE("Permission Denial: "
@@ -2228,7 +2230,7 @@
 
     if (tempId == nullptr) {
         ret = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
-                "Camera %s: Invalid template argument", mCameraIdStr.string());
+                "Camera %s: Invalid template argument", mCameraIdStr.c_str());
         return ret;
     }
     switch(templateId) {
@@ -2253,21 +2255,21 @@
         default:
             ret = STATUS_ERROR_FMT(CameraService::ERROR_ILLEGAL_ARGUMENT,
                     "Camera %s: Template ID %d is invalid or not supported",
-                    mCameraIdStr.string(), templateId);
+                    mCameraIdStr.c_str(), templateId);
             return ret;
     }
 
     return ret;
 }
 
-const CameraMetadata &CameraDeviceClient::getStaticInfo(const String8 &cameraId) {
+const CameraMetadata &CameraDeviceClient::getStaticInfo(const std::string &cameraId) {
     if (mDevice->getId() == cameraId) {
         return mDevice->info();
     }
     return mDevice->infoPhysical(cameraId);
 }
 
-bool CameraDeviceClient::supportsUltraHighResolutionCapture(const String8 &cameraId) {
+bool CameraDeviceClient::supportsUltraHighResolutionCapture(const std::string &cameraId) {
     const CameraMetadata &deviceInfo = getStaticInfo(cameraId);
     return SessionConfigurationUtils::supportsUltraHighResolutionCapture(deviceInfo);
 }
diff --git a/services/camera/libcameraservice/api2/CameraDeviceClient.h b/services/camera/libcameraservice/api2/CameraDeviceClient.h
index 1533cf5..45c904a 100644
--- a/services/camera/libcameraservice/api2/CameraDeviceClient.h
+++ b/services/camera/libcameraservice/api2/CameraDeviceClient.h
@@ -50,10 +50,10 @@
 protected:
     CameraDeviceClientBase(const sp<CameraService>& cameraService,
             const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
-            const String16& clientPackageName,
+            const std::string& clientPackageName,
             bool systemNativeClient,
-            const std::optional<String16>& clientFeatureId,
-            const String8& cameraId,
+            const std::optional<std::string>& clientFeatureId,
+            const std::string& cameraId,
             int api1CameraId,
             int cameraFacing,
             int sensorOrientation,
@@ -181,10 +181,10 @@
     CameraDeviceClient(const sp<CameraService>& cameraService,
             const sp<hardware::camera2::ICameraDeviceCallbacks>& remoteCallback,
             std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
-            const String16& clientPackageName,
+            const std::string& clientPackageName,
             bool clientPackageOverride,
-            const std::optional<String16>& clientFeatureId,
-            const String8& cameraId,
+            const std::optional<std::string>& clientFeatureId,
+            const std::string& cameraId,
             int cameraFacing,
             int sensorOrientation,
             int clientPid,
@@ -195,7 +195,7 @@
     virtual ~CameraDeviceClient();
 
     virtual status_t      initialize(sp<CameraProviderManager> manager,
-            const String8& monitorTags) override;
+            const std::string& monitorTags) override;
 
     virtual status_t      setRotateAndCropOverride(uint8_t rotateAndCrop) override;
 
@@ -211,7 +211,7 @@
 
     virtual status_t      dumpClient(int fd, const Vector<String16>& args);
 
-    virtual status_t      startWatchingTags(const String8 &tags, int out);
+    virtual status_t      startWatchingTags(const std::string &tags, int out);
     virtual status_t      stopWatchingTags(int out);
     virtual status_t      dumpWatchedEventsToVector(std::vector<std::string> &out);
 
@@ -245,12 +245,12 @@
     // Calculate the ANativeWindow transform from android.sensor.orientation
     status_t              getRotationTransformLocked(int mirrorMode, /*out*/int32_t* transform);
 
-    bool supportsUltraHighResolutionCapture(const String8 &cameraId);
+    bool supportsUltraHighResolutionCapture(const std::string &cameraId);
 
     bool isSensorPixelModeConsistent(const std::list<int> &streamIdList,
             const CameraMetadata &settings);
 
-    const CameraMetadata &getStaticInfo(const String8 &cameraId);
+    const CameraMetadata &getStaticInfo(const std::string &cameraId);
 
 private:
     // StreamSurfaceId encapsulates streamId + surfaceId for a particular surface.
@@ -289,7 +289,7 @@
     std::vector<int32_t> mSupportedPhysicalRequestKeys;
 
     template<typename TProviderPtr>
-    status_t      initializeImpl(TProviderPtr providerPtr, const String8& monitorTags);
+    status_t      initializeImpl(TProviderPtr providerPtr, const std::string& monitorTags);
 
     /** Utility members */
     binder::Status checkPidStatus(const char* checkLocation);
diff --git a/services/camera/libcameraservice/api2/CameraOfflineSessionClient.cpp b/services/camera/libcameraservice/api2/CameraOfflineSessionClient.cpp
index 86a0ebc..99bdb0e 100644
--- a/services/camera/libcameraservice/api2/CameraOfflineSessionClient.cpp
+++ b/services/camera/libcameraservice/api2/CameraOfflineSessionClient.cpp
@@ -21,12 +21,13 @@
 #include "CameraOfflineSessionClient.h"
 #include "utils/CameraThreadState.h"
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 
 namespace android {
 
 using binder::Status;
 
-status_t CameraOfflineSessionClient::initialize(sp<CameraProviderManager>, const String8&) {
+status_t CameraOfflineSessionClient::initialize(sp<CameraProviderManager>, const std::string&) {
     ATRACE_CALL();
 
     if (mFrameProcessor.get() != nullptr) {
@@ -42,14 +43,13 @@
 
     if (mOfflineSession.get() == nullptr) {
         ALOGE("%s: Camera %s: No valid offline session",
-                __FUNCTION__, mCameraIdStr.string());
+                __FUNCTION__, mCameraIdStr.c_str());
         return NO_INIT;
     }
 
-    String8 threadName;
     mFrameProcessor = new camera2::FrameProcessorBase(mOfflineSession);
-    threadName = String8::format("Offline-%s-FrameProc", mCameraIdStr.string());
-    res = mFrameProcessor->run(threadName.string());
+    std::string threadName = fmt::sprintf("Offline-%s-FrameProc", mCameraIdStr.c_str());
+    res = mFrameProcessor->run(threadName.c_str());
     if (res != OK) {
         ALOGE("%s: Unable to start frame processor thread: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -65,7 +65,7 @@
     res = mOfflineSession->initialize(weakThis);
     if (res != OK) {
         ALOGE("%s: Camera %s: unable to initialize device: %s (%d)",
-                __FUNCTION__, mCameraIdStr.string(), strerror(-res), res);
+                __FUNCTION__, mCameraIdStr.c_str(), strerror(-res), res);
         return res;
     }
 
@@ -119,14 +119,14 @@
 }
 
 status_t CameraOfflineSessionClient::dumpClient(int fd, const Vector<String16>& args) {
-    String8 result;
+    std::string result;
 
     result = "  Offline session dump:\n";
-    write(fd, result.string(), result.size());
+    write(fd, result.c_str(), result.size());
 
     if (mOfflineSession.get() == nullptr) {
         result = "  *** Offline session is detached\n";
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
         return NO_ERROR;
     }
 
@@ -134,15 +134,15 @@
 
     auto res = mOfflineSession->dump(fd);
     if (res != OK) {
-        result = String8::format("   Error dumping offline session: %s (%d)",
+        result = fmt::sprintf("   Error dumping offline session: %s (%d)",
                 strerror(-res), res);
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
     }
 
     return OK;
 }
 
-status_t CameraOfflineSessionClient::startWatchingTags(const String8 &tags, int outFd) {
+status_t CameraOfflineSessionClient::startWatchingTags(const std::string &tags, int outFd) {
     return BasicClient::startWatchingTags(tags, outFd);
 }
 
@@ -171,7 +171,7 @@
     mDisconnected = true;
 
     sCameraService->removeByClient(this);
-    sCameraService->logDisconnectedOffline(mCameraIdStr, mClientPid, String8(mClientPackageName));
+    sCameraService->logDisconnectedOffline(mCameraIdStr, mClientPid, mClientPackageName);
 
     sp<IBinder> remote = getRemote();
     if (remote != nullptr) {
@@ -186,7 +186,7 @@
 
     finishCameraOps();
     ALOGI("%s: Disconnected client for offline camera %s for PID %d", __FUNCTION__,
-            mCameraIdStr.string(), mClientPid);
+            mCameraIdStr.c_str(), mClientPid);
 
     // client shouldn't be able to call into us anymore
     mClientPid = 0;
@@ -231,7 +231,7 @@
     ATRACE_CALL();
     {
         ALOGV("%s: Start camera ops, package name = %s, client UID = %d",
-              __FUNCTION__, String8(mClientPackageName).string(), mClientUid);
+              __FUNCTION__, mClientPackageName.c_str(), mClientUid);
     }
 
     if (mAppOpsManager != nullptr) {
@@ -240,14 +240,14 @@
         int32_t res;
         // TODO : possibly change this to OP_OFFLINE_CAMERA_SESSION
         mAppOpsManager->startWatchingMode(AppOpsManager::OP_CAMERA,
-                mClientPackageName, mOpsCallback);
+                toString16(mClientPackageName), mOpsCallback);
         // TODO : possibly change this to OP_OFFLINE_CAMERA_SESSION
         res = mAppOpsManager->startOpNoThrow(AppOpsManager::OP_CAMERA,
-                mClientUid, mClientPackageName, /*startIfModeDefault*/ false);
+                mClientUid, toString16(mClientPackageName), /*startIfModeDefault*/ false);
 
         if (res == AppOpsManager::MODE_ERRORED) {
             ALOGI("Offline Camera %s: Access for \"%s\" has been revoked",
-                    mCameraIdStr.string(), String8(mClientPackageName).string());
+                    mCameraIdStr.c_str(), mClientPackageName.c_str());
             return PERMISSION_DENIED;
         }
 
@@ -255,7 +255,7 @@
         // return MODE_IGNORED. Do not treat such case as error.
         if (!mUidIsTrusted && res == AppOpsManager::MODE_IGNORED) {
             ALOGI("Offline Camera %s: Access for \"%s\" has been restricted",
-                    mCameraIdStr.string(), String8(mClientPackageName).string());
+                    mCameraIdStr.c_str(), mClientPackageName.c_str());
             // Return the same error as for device policy manager rejection
             return -EACCES;
         }
@@ -278,7 +278,7 @@
         if (mAppOpsManager != nullptr) {
         // TODO : possibly change this to OP_OFFLINE_CAMERA_SESSION
             mAppOpsManager->finishOp(AppOpsManager::OP_CAMERA, mClientUid,
-                    mClientPackageName);
+                    toString16(mClientPackageName));
             mOpsActive = false;
         }
     }
@@ -368,10 +368,10 @@
                 CaptureResultExtras());
 }
 
-status_t CameraOfflineSessionClient::injectCamera(const String8& injectedCamId,
+status_t CameraOfflineSessionClient::injectCamera(const std::string& injectedCamId,
             sp<CameraProviderManager> manager) {
     ALOGV("%s: This client doesn't support the injection camera. injectedCamId: %s providerPtr: %p",
-            __FUNCTION__, injectedCamId.string(), manager.get());
+            __FUNCTION__, injectedCamId.c_str(), manager.get());
 
     return OK;
 }
diff --git a/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h b/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h
index ad763f9..70bad03 100644
--- a/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h
+++ b/services/camera/libcameraservice/api2/CameraOfflineSessionClient.h
@@ -47,9 +47,9 @@
             sp<CameraOfflineSessionBase> session,
             const KeyedVector<sp<IBinder>, sp<CompositeStream>>& offlineCompositeStreamMap,
             const sp<ICameraDeviceCallbacks>& remoteCallback,
-            const String16& clientPackageName,
-            const std::optional<String16>& clientFeatureId,
-            const String8& cameraIdStr, int cameraFacing, int sensorOrientation,
+            const std::string& clientPackageName,
+            const std::optional<std::string>& clientFeatureId,
+            const std::string& cameraIdStr, int cameraFacing, int sensorOrientation,
             int clientPid, uid_t clientUid, int servicePid) :
             CameraService::BasicClient(
                     cameraService,
@@ -73,12 +73,12 @@
 
     status_t dumpClient(int /*fd*/, const Vector<String16>& /*args*/) override;
 
-    status_t startWatchingTags(const String8 &tags, int outFd) override;
+    status_t startWatchingTags(const std::string &tags, int outFd) override;
     status_t stopWatchingTags(int outFd) override;
     status_t dumpWatchedEventsToVector(std::vector<std::string> &out) override;
 
     status_t initialize(sp<CameraProviderManager> /*manager*/,
-            const String8& /*monitorTags*/) override;
+            const std::string& /*monitorTags*/) override;
 
     status_t setRotateAndCropOverride(uint8_t rotateAndCrop) override;
 
@@ -117,7 +117,7 @@
     void notifyPrepared(int streamId) override;
     void notifyRequestQueueEmpty() override;
     void notifyRepeatingRequestError(long lastFrameNumber) override;
-    status_t injectCamera(const String8& injectedCamId,
+    status_t injectCamera(const std::string& injectedCamId,
             sp<CameraProviderManager> manager) override;
     status_t stopInjection() override;
 
diff --git a/services/camera/libcameraservice/api2/CompositeStream.cpp b/services/camera/libcameraservice/api2/CompositeStream.cpp
index 4ed1c28..8f53458 100644
--- a/services/camera/libcameraservice/api2/CompositeStream.cpp
+++ b/services/camera/libcameraservice/api2/CompositeStream.cpp
@@ -46,7 +46,7 @@
 
 status_t CompositeStream::createStream(const std::vector<sp<Surface>>& consumers,
         bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
-        camera_stream_rotation_t rotation, int * id, const String8& physicalCameraId,
+        camera_stream_rotation_t rotation, int * id, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed,
         std::vector<int> * surfaceIds,
         int streamSetId, bool isShared, bool isMultiResolution, int32_t colorSpace,
diff --git a/services/camera/libcameraservice/api2/CompositeStream.h b/services/camera/libcameraservice/api2/CompositeStream.h
index a551d11..1b7fc6e 100644
--- a/services/camera/libcameraservice/api2/CompositeStream.h
+++ b/services/camera/libcameraservice/api2/CompositeStream.h
@@ -43,7 +43,7 @@
 
     status_t createStream(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
-            camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+            camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds,
             int streamSetId, bool isShared, bool isMultiResolution, int32_t colorSpace,
@@ -57,7 +57,7 @@
     // Create and register all internal camera streams.
     virtual status_t createInternalStreams(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
-            camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+            camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds,
             int streamSetId, bool isShared, int32_t colorSpace,
diff --git a/services/camera/libcameraservice/api2/DepthCompositeStream.cpp b/services/camera/libcameraservice/api2/DepthCompositeStream.cpp
index 737c2b5..1bd0b85 100644
--- a/services/camera/libcameraservice/api2/DepthCompositeStream.cpp
+++ b/services/camera/libcameraservice/api2/DepthCompositeStream.cpp
@@ -20,6 +20,7 @@
 
 #include <aidl/android/hardware/camera/device/CameraBlob.h>
 #include <aidl/android/hardware/camera/device/CameraBlobId.h>
+#include <camera/StringUtils.h>
 
 #include "api1/client2/JpegProcessor.h"
 #include "common/CameraProviderManager.h"
@@ -495,17 +496,17 @@
     status_t err;
     int format;
     if ((err = anw->query(anw, NATIVE_WINDOW_FORMAT, &format)) != OK) {
-        String8 msg = String8::format("Failed to query Surface format: %s (%d)", strerror(-err),
+        std::string msg = fmt::sprintf("Failed to query Surface format: %s (%d)", strerror(-err),
                 err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
         return false;
     }
 
     int dataspace;
     if ((err = anw->query(anw, NATIVE_WINDOW_DEFAULT_DATASPACE, &dataspace)) != OK) {
-        String8 msg = String8::format("Failed to query Surface dataspace: %s (%d)", strerror(-err),
+        std::string msg = fmt::sprintf("Failed to query Surface dataspace: %s (%d)", strerror(-err),
                 err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
         return false;
     }
 
@@ -578,7 +579,7 @@
 
 status_t DepthCompositeStream::createInternalStreams(const std::vector<sp<Surface>>& consumers,
         bool /*hasDeferredConsumer*/, uint32_t width, uint32_t height, int format,
-        camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+        camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed,
         std::vector<int> *surfaceIds,
         int /*streamSetId*/, bool /*isShared*/, int32_t /*colorSpace*/,
diff --git a/services/camera/libcameraservice/api2/DepthCompositeStream.h b/services/camera/libcameraservice/api2/DepthCompositeStream.h
index fbe99dd..f797f9c 100644
--- a/services/camera/libcameraservice/api2/DepthCompositeStream.h
+++ b/services/camera/libcameraservice/api2/DepthCompositeStream.h
@@ -50,7 +50,7 @@
     // CompositeStream overrides
     status_t createInternalStreams(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
-            camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+            camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds,
             int streamSetId, bool isShared, int32_t colorSpace,
diff --git a/services/camera/libcameraservice/api2/HeicCompositeStream.cpp b/services/camera/libcameraservice/api2/HeicCompositeStream.cpp
index 294a908..68e9ad4 100644
--- a/services/camera/libcameraservice/api2/HeicCompositeStream.cpp
+++ b/services/camera/libcameraservice/api2/HeicCompositeStream.cpp
@@ -29,6 +29,7 @@
 #include <gui/Surface.h>
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 
 #include <mediadrm/ICrypto.h>
 #include <media/MediaCodecBuffer.h>
@@ -98,17 +99,17 @@
     status_t err;
     int format;
     if ((err = anw->query(anw, NATIVE_WINDOW_FORMAT, &format)) != OK) {
-        String8 msg = String8::format("Failed to query Surface format: %s (%d)", strerror(-err),
+        std::string msg = fmt::sprintf("Failed to query Surface format: %s (%d)", strerror(-err),
                 err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
         return false;
     }
 
     int dataspace;
     if ((err = anw->query(anw, NATIVE_WINDOW_DEFAULT_DATASPACE, &dataspace)) != OK) {
-        String8 msg = String8::format("Failed to query Surface dataspace: %s (%d)", strerror(-err),
+        std::string msg = fmt::sprintf("Failed to query Surface dataspace: %s (%d)", strerror(-err),
                 err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
         return false;
     }
 
@@ -117,7 +118,7 @@
 
 status_t HeicCompositeStream::createInternalStreams(const std::vector<sp<Surface>>& consumers,
         bool /*hasDeferredConsumer*/, uint32_t width, uint32_t height, int format,
-        camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+        camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed,
         std::vector<int> *surfaceIds,
         int /*streamSetId*/, bool /*isShared*/, int32_t colorSpace,
diff --git a/services/camera/libcameraservice/api2/HeicCompositeStream.h b/services/camera/libcameraservice/api2/HeicCompositeStream.h
index 602a247..b539cdd 100644
--- a/services/camera/libcameraservice/api2/HeicCompositeStream.h
+++ b/services/camera/libcameraservice/api2/HeicCompositeStream.h
@@ -45,7 +45,7 @@
 
     status_t createInternalStreams(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
-            camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+            camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds, int streamSetId, bool isShared, int32_t colorSpace,
             int64_t dynamicProfile, int64_t streamUseCase, bool useReadoutTimestamp) override;
diff --git a/services/camera/libcameraservice/api2/JpegRCompositeStream.cpp b/services/camera/libcameraservice/api2/JpegRCompositeStream.cpp
index 6588470..988446b 100644
--- a/services/camera/libcameraservice/api2/JpegRCompositeStream.cpp
+++ b/services/camera/libcameraservice/api2/JpegRCompositeStream.cpp
@@ -548,7 +548,7 @@
 
 status_t JpegRCompositeStream::createInternalStreams(const std::vector<sp<Surface>>& consumers,
         bool /*hasDeferredConsumer*/, uint32_t width, uint32_t height, int format,
-        camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+        camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed,
         std::vector<int> *surfaceIds,
         int /*streamSetId*/, bool /*isShared*/, int32_t colorSpace,
diff --git a/services/camera/libcameraservice/api2/JpegRCompositeStream.h b/services/camera/libcameraservice/api2/JpegRCompositeStream.h
index 3dfed30..016d57c 100644
--- a/services/camera/libcameraservice/api2/JpegRCompositeStream.h
+++ b/services/camera/libcameraservice/api2/JpegRCompositeStream.h
@@ -47,7 +47,7 @@
     // CompositeStream overrides
     status_t createInternalStreams(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
-            camera_stream_rotation_t rotation, int *id, const String8& physicalCameraId,
+            camera_stream_rotation_t rotation, int *id, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds,
             int streamSetId, bool isShared, int32_t colorSpace,
diff --git a/services/camera/libcameraservice/common/Camera2ClientBase.cpp b/services/camera/libcameraservice/common/Camera2ClientBase.cpp
index 6e10f30..a54ba9b 100644
--- a/services/camera/libcameraservice/common/Camera2ClientBase.cpp
+++ b/services/camera/libcameraservice/common/Camera2ClientBase.cpp
@@ -28,6 +28,7 @@
 #include <gui/Surface.h>
 
 #include <camera/CameraSessionStats.h>
+#include <camera/StringUtils.h>
 
 #include "common/Camera2ClientBase.h"
 
@@ -49,10 +50,10 @@
         const sp<CameraService>& cameraService,
         const sp<TCamCallbacks>& remoteCallback,
         std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
-        const String16& clientPackageName,
+        const std::string& clientPackageName,
         bool systemNativeClient,
-        const std::optional<String16>& clientFeatureId,
-        const String8& cameraId,
+        const std::optional<std::string>& clientFeatureId,
+        const std::string& cameraId,
         int api1CameraId,
         int cameraFacing,
         int sensorOrientation,
@@ -69,8 +70,8 @@
         mCameraServiceProxyWrapper(cameraServiceProxyWrapper),
         mDeviceActive(false), mApi1CameraId(api1CameraId)
 {
-    ALOGI("Camera %s: Opened. Client: %s (PID %d, UID %d)", cameraId.string(),
-            String8(clientPackageName).string(), clientPid, clientUid);
+    ALOGI("Camera %s: Opened. Client: %s (PID %d, UID %d)", cameraId.c_str(),
+            clientPackageName.c_str(), clientPid, clientUid);
 
     mInitialClientPid = clientPid;
     mOverrideForPerfClass = overrideForPerfClass;
@@ -91,21 +92,21 @@
 
 template <typename TClientBase>
 status_t Camera2ClientBase<TClientBase>::initialize(sp<CameraProviderManager> manager,
-        const String8& monitorTags) {
+        const std::string& monitorTags) {
     return initializeImpl(manager, monitorTags);
 }
 
 template <typename TClientBase>
 template <typename TProviderPtr>
 status_t Camera2ClientBase<TClientBase>::initializeImpl(TProviderPtr providerPtr,
-        const String8& monitorTags) {
+        const std::string& monitorTags) {
     ATRACE_CALL();
     ALOGV("%s: Initializing client for camera %s", __FUNCTION__,
-          TClientBase::mCameraIdStr.string());
+          TClientBase::mCameraIdStr.c_str());
     status_t res;
 
     IPCTransport providerTransport = IPCTransport::INVALID;
-    res = providerPtr->getCameraIdIPCTransport(TClientBase::mCameraIdStr.string(),
+    res = providerPtr->getCameraIdIPCTransport(TClientBase::mCameraIdStr,
             &providerTransport);
     if (res != OK) {
         return res;
@@ -125,19 +126,19 @@
              break;
         default:
             ALOGE("%s Invalid transport for camera id %s", __FUNCTION__,
-                    TClientBase::mCameraIdStr.string());
+                    TClientBase::mCameraIdStr.c_str());
             return NO_INIT;
     }
     if (mDevice == NULL) {
         ALOGE("%s: Camera %s: No device connected",
-                __FUNCTION__, TClientBase::mCameraIdStr.string());
+                __FUNCTION__, TClientBase::mCameraIdStr.c_str());
         return NO_INIT;
     }
 
     res = mDevice->initialize(providerPtr, monitorTags);
     if (res != OK) {
         ALOGE("%s: Camera %s: unable to initialize device: %s (%d)",
-                __FUNCTION__, TClientBase::mCameraIdStr.string(), strerror(-res), res);
+                __FUNCTION__, TClientBase::mCameraIdStr.c_str(), strerror(-res), res);
         return res;
     }
 
@@ -152,7 +153,7 @@
     res = mDevice->setNotifyCallback(weakThis);
     if (res != OK) {
         ALOGE("%s: Camera %s: Unable to set notify callback: %s (%d)",
-                __FUNCTION__, TClientBase::mCameraIdStr.string(), strerror(-res), res);
+                __FUNCTION__, TClientBase::mCameraIdStr.c_str(), strerror(-res), res);
         return res;
     }
 
@@ -183,30 +184,30 @@
     }
 
     ALOGI("%s: Client object's dtor for Camera Id %s completed. Client was: %s (PID %d, UID %u)",
-            __FUNCTION__, TClientBase::mCameraIdStr.string(),
-            String8(TClientBase::mClientPackageName).string(),
+            __FUNCTION__, TClientBase::mCameraIdStr.c_str(),
+            TClientBase::mClientPackageName.c_str(),
             mInitialClientPid, TClientBase::mClientUid);
 }
 
 template <typename TClientBase>
 status_t Camera2ClientBase<TClientBase>::dumpClient(int fd,
                                               const Vector<String16>& args) {
-    String8 result;
-    result.appendFormat("Camera2ClientBase[%s] (%p) PID: %d, dump:\n",
-            TClientBase::mCameraIdStr.string(),
+    std::string result;
+    result += fmt::sprintf("Camera2ClientBase[%s] (%p) PID: %d, dump:\n",
+            TClientBase::mCameraIdStr.c_str(),
             (TClientBase::getRemoteCallback() != NULL ?
-                    IInterface::asBinder(TClientBase::getRemoteCallback()).get() : NULL),
+                    (void *)IInterface::asBinder(TClientBase::getRemoteCallback()).get() : NULL),
             TClientBase::mClientPid);
-    result.append("  State: ");
+    result += "  State: ";
 
-    write(fd, result.string(), result.size());
+    write(fd, result.c_str(), result.size());
     // TODO: print dynamic/request section from most recent requests
 
     return dumpDevice(fd, args);
 }
 
 template <typename TClientBase>
-status_t Camera2ClientBase<TClientBase>::startWatchingTags(const String8 &tags, int out) {
+status_t Camera2ClientBase<TClientBase>::startWatchingTags(const std::string &tags, int out) {
   sp<CameraDeviceBase> device = mDevice;
   if (!device) {
     dprintf(out, "  Device is detached");
@@ -241,23 +242,23 @@
 status_t Camera2ClientBase<TClientBase>::dumpDevice(
                                                 int fd,
                                                 const Vector<String16>& args) {
-    String8 result;
+    std::string result;
 
     result = "  Device dump:\n";
-    write(fd, result.string(), result.size());
+    write(fd, result.c_str(), result.size());
 
     sp<CameraDeviceBase> device = mDevice;
     if (!device.get()) {
         result = "  *** Device is detached\n";
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
         return NO_ERROR;
     }
 
     status_t res = device->dump(fd, args);
     if (res != OK) {
-        result = String8::format("   Error dumping device: %s (%d)",
+        result = fmt::sprintf("   Error dumping device: %s (%d)",
                 strerror(-res), res);
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
     }
 
     return NO_ERROR;
@@ -284,23 +285,23 @@
 template <typename TClientBase>
 binder::Status Camera2ClientBase<TClientBase>::disconnectImpl() {
     ATRACE_CALL();
-    ALOGD("Camera %s: start to disconnect", TClientBase::mCameraIdStr.string());
+    ALOGD("Camera %s: start to disconnect", TClientBase::mCameraIdStr.c_str());
     Mutex::Autolock icl(mBinderSerializationLock);
 
-    ALOGD("Camera %s: serializationLock acquired", TClientBase::mCameraIdStr.string());
+    ALOGD("Camera %s: serializationLock acquired", TClientBase::mCameraIdStr.c_str());
     binder::Status res = binder::Status::ok();
     // Allow both client and the media server to disconnect at all times
     int callingPid = CameraThreadState::getCallingPid();
     if (callingPid != TClientBase::mClientPid &&
         callingPid != TClientBase::mServicePid) return res;
 
-    ALOGD("Camera %s: Shutting down", TClientBase::mCameraIdStr.string());
+    ALOGD("Camera %s: Shutting down", TClientBase::mCameraIdStr.c_str());
 
     // Before detaching the device, cache the info from current open session.
     // The disconnected check avoids duplication of info and also prevents
     // deadlock while acquiring service lock in cacheDump.
     if (!TClientBase::mDisconnected) {
-        ALOGD("Camera %s: start to cacheDump", TClientBase::mCameraIdStr.string());
+        ALOGD("Camera %s: start to cacheDump", TClientBase::mCameraIdStr.c_str());
         Camera2ClientBase::getCameraService()->cacheDump();
     }
 
@@ -308,7 +309,7 @@
 
     CameraService::BasicClient::disconnect();
 
-    ALOGV("Camera %s: Shut down complete", TClientBase::mCameraIdStr.string());
+    ALOGV("Camera %s: Shut down complete", TClientBase::mCameraIdStr.c_str());
 
     return res;
 }
@@ -318,7 +319,7 @@
     if (mDevice == 0) return;
     mDevice->disconnect();
 
-    ALOGV("Camera %s: Detach complete", TClientBase::mCameraIdStr.string());
+    ALOGV("Camera %s: Detach complete", TClientBase::mCameraIdStr.c_str());
 }
 
 template <typename TClientBase>
@@ -334,7 +335,7 @@
         ALOGE("%s: Camera %s: Connection attempt from pid %d; "
                 "current locked to pid %d",
                 __FUNCTION__,
-                TClientBase::mCameraIdStr.string(),
+                TClientBase::mCameraIdStr.c_str(),
                 CameraThreadState::getCallingPid(),
                 TClientBase::mClientPid);
         return BAD_VALUE;
@@ -365,8 +366,7 @@
         return;
     }
 
-    String8 physicalId8(physicalId.c_str());
-    auto physicalCameraMetadata = mDevice->infoPhysical(physicalId8);
+    auto physicalCameraMetadata = mDevice->infoPhysical(physicalId);
     auto orientationEntry = physicalCameraMetadata.find(ANDROID_SENSOR_ORIENTATION);
 
     if (orientationEntry.count == 1) {
@@ -387,7 +387,7 @@
         status_t res = TClientBase::startCameraStreamingOps();
         if (res != OK) {
             ALOGE("%s: Camera %s: Error starting camera streaming ops: %d", __FUNCTION__,
-                    TClientBase::mCameraIdStr.string(), res);
+                    TClientBase::mCameraIdStr.c_str(), res);
             return res;
         }
         mCameraServiceProxyWrapper->logActive(TClientBase::mCameraIdStr, maxPreviewFps);
@@ -407,7 +407,7 @@
         status_t res = TClientBase::finishCameraStreamingOps();
         if (res != OK) {
             ALOGE("%s: Camera %s: Error finishing streaming ops: %d", __FUNCTION__,
-                    TClientBase::mCameraIdStr.string(), res);
+                    TClientBase::mCameraIdStr.c_str(), res);
         }
         mCameraServiceProxyWrapper->logIdle(TClientBase::mCameraIdStr,
                 requestCount, resultErrorCount, deviceError, userTag, videoStabilizationMode,
@@ -522,7 +522,7 @@
 }
 
 template <typename TClientBase>
-status_t Camera2ClientBase<TClientBase>::injectCamera(const String8& injectedCamId,
+status_t Camera2ClientBase<TClientBase>::injectCamera(const std::string& injectedCamId,
         sp<CameraProviderManager> manager) {
     return mDevice->injectCamera(injectedCamId, manager);
 }
diff --git a/services/camera/libcameraservice/common/Camera2ClientBase.h b/services/camera/libcameraservice/common/Camera2ClientBase.h
index 5cf3033..30c763d 100644
--- a/services/camera/libcameraservice/common/Camera2ClientBase.h
+++ b/services/camera/libcameraservice/common/Camera2ClientBase.h
@@ -50,10 +50,10 @@
     Camera2ClientBase(const sp<CameraService>& cameraService,
                       const sp<TCamCallbacks>& remoteCallback,
                       std::shared_ptr<CameraServiceProxyWrapper> cameraServiceProxyWrapper,
-                      const String16& clientPackageName,
+                      const std::string& clientPackageName,
                       bool systemNativeClient,
-                      const std::optional<String16>& clientFeatureId,
-                      const String8& cameraId,
+                      const std::optional<std::string>& clientFeatureId,
+                      const std::string& cameraId,
                       int api1CameraId,
                       int cameraFacing,
                       int sensorOrientation,
@@ -65,11 +65,12 @@
                       bool legacyClient = false);
     virtual ~Camera2ClientBase();
 
-    virtual status_t      initialize(sp<CameraProviderManager> manager, const String8& monitorTags);
-    virtual status_t      dumpClient(int fd, const Vector<String16>& args);
-    virtual status_t      startWatchingTags(const String8 &tags, int out);
-    virtual status_t      stopWatchingTags(int out);
-    virtual status_t      dumpWatchedEventsToVector(std::vector<std::string> &out);
+    virtual status_t      initialize(sp<CameraProviderManager> manager,
+            const std::string& monitorTags) override;
+    virtual status_t      dumpClient(int fd, const Vector<String16>& args) override;
+    virtual status_t      startWatchingTags(const std::string &tags, int out) override;
+    virtual status_t      stopWatchingTags(int out) override;
+    virtual status_t      dumpWatchedEventsToVector(std::vector<std::string> &out) override;
 
     /**
      * NotificationListener implementation
@@ -130,7 +131,7 @@
         mutable Mutex mRemoteCallbackLock;
     } mSharedCameraCallbacks;
 
-    status_t      injectCamera(const String8& injectedCamId,
+    status_t      injectCamera(const std::string& injectedCamId,
                                sp<CameraProviderManager> manager) override;
     status_t      stopInjection() override;
 
@@ -181,7 +182,7 @@
 
 private:
     template<typename TProviderPtr>
-    status_t              initializeImpl(TProviderPtr providerPtr, const String8& monitorTags);
+    status_t              initializeImpl(TProviderPtr providerPtr, const std::string& monitorTags);
 
     binder::Status disconnectImpl();
 
diff --git a/services/camera/libcameraservice/common/CameraDeviceBase.h b/services/camera/libcameraservice/common/CameraDeviceBase.h
index 919108d..017da0f 100644
--- a/services/camera/libcameraservice/common/CameraDeviceBase.h
+++ b/services/camera/libcameraservice/common/CameraDeviceBase.h
@@ -20,7 +20,6 @@
 #include <list>
 
 #include <utils/RefBase.h>
-#include <utils/String8.h>
 #include <utils/String16.h>
 #include <utils/Vector.h>
 #include <utils/KeyedVector.h>
@@ -99,11 +98,12 @@
      */
     virtual metadata_vendor_id_t getVendorTagId() const = 0;
 
-    virtual status_t initialize(sp<CameraProviderManager> manager, const String8& monitorTags) = 0;
+    virtual status_t initialize(sp<CameraProviderManager> manager,
+            const std::string& monitorTags) = 0;
     virtual status_t disconnect() = 0;
 
     virtual status_t dump(int fd, const Vector<String16> &args) = 0;
-    virtual status_t startWatchingTags(const String8 &tags) = 0;
+    virtual status_t startWatchingTags(const std::string &tags) = 0;
     virtual status_t stopWatchingTags() = 0;
     virtual status_t dumpWatchedEventsToVector(std::vector<std::string> &out) = 0;
 
@@ -111,7 +111,7 @@
      * The physical camera device's static characteristics metadata buffer, or
      * the logical camera's static characteristics if physical id is empty.
      */
-    virtual const CameraMetadata& infoPhysical(const String8& physicalId) const = 0;
+    virtual const CameraMetadata& infoPhysical(const std::string& physicalId) const = 0;
 
     virtual bool isCompositeJpegRDisabled() const { return false; };
 
@@ -188,7 +188,7 @@
     virtual status_t createStream(sp<Surface> consumer,
             uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation, int *id,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t>  &sensorPixelModesUsed,
             std::vector<int> *surfaceIds = nullptr,
             int streamSetId = camera3::CAMERA3_STREAM_SET_ID_INVALID,
@@ -212,7 +212,7 @@
     virtual status_t createStream(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation, int *id,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds = nullptr,
             int streamSetId = camera3::CAMERA3_STREAM_SET_ID_INVALID,
@@ -510,7 +510,7 @@
      * The injection camera session to replace the internal camera
      * session.
      */
-    virtual status_t injectCamera(const String8& injectedCamId,
+    virtual status_t injectCamera(const std::string& injectedCamId,
             sp<CameraProviderManager> manager) = 0;
 
     /**
diff --git a/services/camera/libcameraservice/common/CameraOfflineSessionBase.h b/services/camera/libcameraservice/common/CameraOfflineSessionBase.h
index 63abcf0..976c47c 100644
--- a/services/camera/libcameraservice/common/CameraOfflineSessionBase.h
+++ b/services/camera/libcameraservice/common/CameraOfflineSessionBase.h
@@ -20,7 +20,6 @@
 #include <vector>
 
 #include <utils/RefBase.h>
-#include <utils/String8.h>
 #include <utils/Timers.h>
 
 #include "camera/CaptureResult.h"
diff --git a/services/camera/libcameraservice/common/CameraProviderManager.cpp b/services/camera/libcameraservice/common/CameraProviderManager.cpp
index 1a6e341..23051ef 100644
--- a/services/camera/libcameraservice/common/CameraProviderManager.cpp
+++ b/services/camera/libcameraservice/common/CameraProviderManager.cpp
@@ -43,6 +43,7 @@
 #include <hwbinder/IPCThreadState.h>
 #include <utils/Trace.h>
 #include <ui/PublicFormat.h>
+#include <camera/StringUtils.h>
 
 #include "api2/HeicCompositeStream.h"
 #include "device3/ZoomRatioMapper.h"
@@ -143,7 +144,7 @@
             String16(aidlHalServiceDescriptor));
     for (const auto &aidlInstance : aidlProviders) {
         std::string aidlServiceName =
-                getFullAidlProviderName(std::string(String8(aidlInstance).c_str()));
+                getFullAidlProviderName(toStdString(aidlInstance));
         auto res = sm->registerForNotifications(String16(aidlServiceName.c_str()), this);
         if (res != OK) {
             ALOGE("%s Unable to register for notifications with AIDL service manager",
@@ -774,14 +775,14 @@
         primaryMap = &mCameraProviderByCameraId;
         alternateMap = &mTorchProviderByCameraId;
     }
-    auto id = cameraId.c_str();
-    (*primaryMap)[id] = provider;
-    auto search = alternateMap->find(id);
+
+    (*primaryMap)[cameraId] = provider;
+    auto search = alternateMap->find(cameraId);
     if (search != alternateMap->end()) {
         ALOGW("%s: Camera device %s is using both torch mode and camera mode simultaneously. "
-                "That should not be possible", __FUNCTION__, id);
+                "That should not be possible", __FUNCTION__, cameraId.c_str());
     }
-    ALOGV("%s: Camera device %s connected", __FUNCTION__, id);
+    ALOGV("%s: Camera device %s connected", __FUNCTION__, cameraId.c_str());
 }
 
 void CameraProviderManager::removeRef(DeviceMode usageType, const std::string &cameraId) {
@@ -796,7 +797,7 @@
         providerMap = &mCameraProviderByCameraId;
     }
     std::lock_guard<std::mutex> lock(mProviderInterfaceMapLock);
-    auto search = providerMap->find(cameraId.c_str());
+    auto search = providerMap->find(cameraId);
     if (search != providerMap->end()) {
         // Drop the reference to this ICameraProvider. This is safe to do immediately (without an
         // added delay) because hwservicemanager guarantees to hold the reference for at least five
@@ -805,7 +806,7 @@
         // restart it. An example when this could happen is switching from a front-facing to a
         // rear-facing camera. If the HAL were to exit during the camera switch, the camera could
         // appear janky to the user.
-        providerMap->erase(cameraId.c_str());
+        providerMap->erase(cameraId);
         IPCThreadState::self()->flushCommands();
     } else {
         ALOGE("%s: Asked to remove reference for camera %s, but no reference to it was found. This "
@@ -823,7 +824,7 @@
     {
         std::lock_guard<std::mutex> lock(mInterfaceMutex);
 
-        res = addAidlProviderLocked(String8(name).c_str());
+        res = addAidlProviderLocked(toStdString(name));
     }
 
     sp<StatusListener> listener = getStatusListener();
@@ -2035,14 +2036,14 @@
 status_t CameraProviderManager::removeProvider(const std::string& provider) {
     std::lock_guard<std::mutex> providerLock(mProviderLifecycleLock);
     std::unique_lock<std::mutex> lock(mInterfaceMutex);
-    std::vector<String8> removedDeviceIds;
+    std::vector<std::string> removedDeviceIds;
     status_t res = NAME_NOT_FOUND;
     std::string removedProviderName;
     for (auto it = mProviders.begin(); it != mProviders.end(); it++) {
         if ((*it)->mProviderInstance == provider) {
             removedDeviceIds.reserve((*it)->mDevices.size());
             for (auto& deviceInfo : (*it)->mDevices) {
-                removedDeviceIds.push_back(String8(deviceInfo->mId.c_str()));
+                removedDeviceIds.push_back(deviceInfo->mId);
             }
             removedProviderName = (*it)->mProviderName;
             mProviders.erase(it);
@@ -2182,7 +2183,7 @@
     return OK;
 }
 
-void CameraProviderManager::ProviderInfo::removeDevice(std::string id) {
+void CameraProviderManager::ProviderInfo::removeDevice(const std::string &id) {
     for (auto it = mDevices.begin(); it != mDevices.end(); it++) {
         if ((*it)->mId == id) {
             mUniqueCameraIds.erase(id);
@@ -2222,8 +2223,7 @@
             ALOGV("%s: notify device not_present: %s",
                   __FUNCTION__,
                   deviceName.c_str());
-            listener->onDeviceStatusChanged(String8(id.c_str()),
-                                            CameraDeviceStatus::NOT_PRESENT);
+            listener->onDeviceStatusChanged(id, CameraDeviceStatus::NOT_PRESENT);
             mLock.lock();
         }
     }
@@ -2324,8 +2324,7 @@
     CameraDeviceStatus internalNewStatus = newStatus;
     if (!mInitialized) {
         mCachedStatus.emplace_back(false /*isPhysicalCameraStatus*/,
-                cameraDeviceName.c_str(), std::string().c_str(),
-                internalNewStatus);
+                cameraDeviceName, std::string(), internalNewStatus);
         return;
     }
 
@@ -2339,7 +2338,7 @@
 
     // Call without lock held to allow reentrancy into provider manager
     if (listener != nullptr) {
-        listener->onDeviceStatusChanged(String8(id.c_str()), internalNewStatus);
+        listener->onDeviceStatusChanged(id, internalNewStatus);
     }
 }
 
@@ -2415,8 +2414,7 @@
     }
     // Call without lock held to allow reentrancy into provider manager
     if (listener != nullptr) {
-        listener->onDeviceStatusChanged(String8(id.c_str()),
-                String8(physicalId.c_str()), newStatus);
+        listener->onDeviceStatusChanged(id, physicalId, newStatus);
     }
     return;
 }
@@ -2467,7 +2465,7 @@
     }
 
     *id = cameraId;
-    *physicalId = physicalCameraDeviceName.c_str();
+    *physicalId = physicalCameraDeviceName;
     return OK;
 }
 
@@ -2511,7 +2509,7 @@
     // findDeviceInfo, which should be holding mLock while iterating through
     // each provider's devices).
     if (listener != nullptr) {
-        listener->onTorchStatusChanged(String8(id.c_str()), newStatus, systemCameraKind);
+        listener->onTorchStatusChanged(id, newStatus, systemCameraKind);
     }
     return;
 }
diff --git a/services/camera/libcameraservice/common/CameraProviderManager.h b/services/camera/libcameraservice/common/CameraProviderManager.h
index e6e4619..a2ec576 100644
--- a/services/camera/libcameraservice/common/CameraProviderManager.h
+++ b/services/camera/libcameraservice/common/CameraProviderManager.h
@@ -179,15 +179,15 @@
     struct StatusListener : virtual public RefBase {
         ~StatusListener() {}
 
-        virtual void onDeviceStatusChanged(const String8 &cameraId,
+        virtual void onDeviceStatusChanged(const std::string &cameraId,
                 CameraDeviceStatus newStatus) = 0;
-        virtual void onDeviceStatusChanged(const String8 &cameraId,
-                const String8 &physicalCameraId,
+        virtual void onDeviceStatusChanged(const std::string &cameraId,
+                const std::string &physicalCameraId,
                 CameraDeviceStatus newStatus) = 0;
-        virtual void onTorchStatusChanged(const String8 &cameraId,
+        virtual void onTorchStatusChanged(const std::string &cameraId,
                 TorchModeStatus newStatus,
                 SystemCameraKind kind) = 0;
-        virtual void onTorchStatusChanged(const String8 &cameraId,
+        virtual void onTorchStatusChanged(const std::string &cameraId,
                 TorchModeStatus newStatus) = 0;
         virtual void onNewProviderRegistered() = 0;
     };
@@ -784,7 +784,7 @@
         void torchModeStatusChangeInternal(const std::string& cameraDeviceName,
                 TorchModeStatus newStatus);
 
-        void removeDevice(std::string id);
+        void removeDevice(const std::string &id);
 
     };
 
diff --git a/services/camera/libcameraservice/common/FrameProcessorBase.cpp b/services/camera/libcameraservice/common/FrameProcessorBase.cpp
index e259379..2322def 100644
--- a/services/camera/libcameraservice/common/FrameProcessorBase.cpp
+++ b/services/camera/libcameraservice/common/FrameProcessorBase.cpp
@@ -21,6 +21,7 @@
 #include <map>
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 
 #include "common/FrameProducer.h"
 #include "common/FrameProcessorBase.h"
@@ -86,8 +87,8 @@
 }
 
 void FrameProcessorBase::dump(int fd, const Vector<String16>& /*args*/) {
-    String8 result("    Latest received frame:\n");
-    write(fd, result.string(), result.size());
+    std::string result("    Latest received frame:\n");
+    write(fd, result.c_str(), result.size());
 
     CameraMetadata lastFrame;
     std::map<std::string, CameraMetadata> lastPhysicalFrames;
@@ -97,16 +98,16 @@
         lastFrame = CameraMetadata(mLastFrame);
 
         for (const auto& physicalFrame : mLastPhysicalFrames) {
-            lastPhysicalFrames.emplace(String8(physicalFrame.mPhysicalCameraId),
+            lastPhysicalFrames.emplace(physicalFrame.mPhysicalCameraId,
                     physicalFrame.mPhysicalCameraMetadata);
         }
     }
     lastFrame.dump(fd, /*verbosity*/2, /*indentation*/6);
 
     for (const auto& physicalFrame : lastPhysicalFrames) {
-        result = String8::format("   Latest received frame for physical camera %s:\n",
+        result = fmt::sprintf("   Latest received frame for physical camera %s:\n",
                 physicalFrame.first.c_str());
-        write(fd, result.string(), result.size());
+        write(fd, result.c_str(), result.size());
         CameraMetadata lastPhysicalMetadata = CameraMetadata(physicalFrame.second);
         lastPhysicalMetadata.sort();
         lastPhysicalMetadata.dump(fd, /*verbosity*/2, /*indentation*/6);
@@ -138,7 +139,7 @@
     ATRACE_CALL();
     CaptureResult result;
 
-    ALOGV("%s: Camera %s: Process new frames", __FUNCTION__, device->getId().string());
+    ALOGV("%s: Camera %s: Process new frames", __FUNCTION__, device->getId().c_str());
 
     while ( (res = device->getNextResult(&result)) == OK) {
 
@@ -149,7 +150,7 @@
         entry = result.mMetadata.find(ANDROID_REQUEST_FRAME_COUNT);
         if (entry.count == 0) {
             ALOGE("%s: Camera %s: Error reading frame number",
-                    __FUNCTION__, device->getId().string());
+                    __FUNCTION__, device->getId().c_str());
             break;
         }
         ATRACE_INT("cam2_frame", entry.data.i32[0]);
@@ -167,7 +168,7 @@
     }
     if (res != NOT_ENOUGH_DATA) {
         ALOGE("%s: Camera %s: Error getting next frame: %s (%d)",
-                __FUNCTION__, device->getId().string(), strerror(-res), res);
+                __FUNCTION__, device->getId().c_str(), strerror(-res), res);
         return;
     }
 
@@ -177,7 +178,7 @@
 bool FrameProcessorBase::processSingleFrame(CaptureResult &result,
                                             const sp<FrameProducer> &device) {
     ALOGV("%s: Camera %s: Process single frame (is empty? %d)",
-            __FUNCTION__, device->getId().string(), result.mMetadata.isEmpty());
+            __FUNCTION__, device->getId().c_str(), result.mMetadata.isEmpty());
     return processListeners(result, device) == OK;
 }
 
@@ -197,7 +198,7 @@
     // include CaptureResultExtras.
     entry = result.mMetadata.find(ANDROID_REQUEST_ID);
     if (entry.count == 0) {
-        ALOGE("%s: Camera %s: Error reading frame id", __FUNCTION__, device->getId().string());
+        ALOGE("%s: Camera %s: Error reading frame id", __FUNCTION__, device->getId().c_str());
         return BAD_VALUE;
     }
     int32_t requestId = entry.data.i32[0];
@@ -223,7 +224,7 @@
         }
     }
     ALOGV("%s: Camera %s: Got %zu range listeners out of %zu", __FUNCTION__,
-          device->getId().string(), listeners.size(), mRangeListeners.size());
+          device->getId().c_str(), listeners.size(), mRangeListeners.size());
 
     List<sp<FilteredListener> >::iterator item = listeners.begin();
     for (; item != listeners.end(); item++) {
diff --git a/services/camera/libcameraservice/common/FrameProducer.h b/services/camera/libcameraservice/common/FrameProducer.h
index a14b3d6..dd4df7d 100644
--- a/services/camera/libcameraservice/common/FrameProducer.h
+++ b/services/camera/libcameraservice/common/FrameProducer.h
@@ -18,7 +18,6 @@
 #define ANDROID_SERVERS_CAMERA_FRAMEPRODUCER_H
 
 #include <utils/RefBase.h>
-#include <utils/String8.h>
 #include <utils/Timers.h>
 
 #include "camera/CameraMetadata.h"
@@ -39,7 +38,7 @@
     /**
      * Retrieve the device camera ID
      */
-    virtual const String8& getId() const = 0;
+    virtual const std::string& getId() const = 0;
 
     /**
      * Wait for a new frame to be produced, with timeout in nanoseconds.
diff --git a/services/camera/libcameraservice/common/aidl/AidlProviderInfo.cpp b/services/camera/libcameraservice/common/aidl/AidlProviderInfo.cpp
index b18cbd4..5e79d6b 100644
--- a/services/camera/libcameraservice/common/aidl/AidlProviderInfo.cpp
+++ b/services/camera/libcameraservice/common/aidl/AidlProviderInfo.cpp
@@ -431,7 +431,7 @@
     for (const auto& combination : combs) {
         std::unordered_set<std::string> deviceIds;
         for (const auto &cameraDeviceId : combination.combination) {
-            deviceIds.insert(cameraDeviceId.c_str());
+            deviceIds.insert(cameraDeviceId);
         }
         mConcurrentCameraIdCombinations.push_back(std::move(deviceIds));
     }
@@ -735,7 +735,7 @@
     camera::device::StreamConfiguration streamConfiguration;
     bool earlyExit = false;
     auto bRes = SessionConfigurationUtils::convertToHALStreamCombination(configuration,
-            String8(mId.c_str()), mCameraCharacteristics, mCompositeJpegRDisabled, getMetadata,
+            mId, mCameraCharacteristics, mCompositeJpegRDisabled, getMetadata,
             mPhysicalIds, streamConfiguration, overrideForPerfClass, &earlyExit);
 
     if (!bRes.isOk()) {
@@ -789,9 +789,9 @@
             return res;
         }
         camera3::metadataGetter getMetadata =
-                [this](const String8 &id, bool overrideForPerfClass) {
+                [this](const std::string &id, bool overrideForPerfClass) {
                     CameraMetadata physicalDeviceInfo;
-                    mManager->getCameraCharacteristicsLocked(id.string(), overrideForPerfClass,
+                    mManager->getCameraCharacteristicsLocked(id, overrideForPerfClass,
                                                    &physicalDeviceInfo,
                                                    /*overrideToPortrait*/false);
                     return physicalDeviceInfo;
@@ -801,7 +801,7 @@
         bStatus =
             SessionConfigurationUtils::convertToHALStreamCombination(
                     cameraIdAndSessionConfig.mSessionConfiguration,
-                    String8(cameraId.c_str()), deviceInfo,
+                    cameraId, deviceInfo,
                     mManager->isCompositeJpegRDisabledLocked(cameraId), getMetadata,
                     physicalCameraIds, streamConfiguration,
                     overrideForPerfClass, &shouldExit);
diff --git a/services/camera/libcameraservice/common/hidl/HidlProviderInfo.cpp b/services/camera/libcameraservice/common/hidl/HidlProviderInfo.cpp
index 8ff5c3f..bf7a471 100644
--- a/services/camera/libcameraservice/common/hidl/HidlProviderInfo.cpp
+++ b/services/camera/libcameraservice/common/hidl/HidlProviderInfo.cpp
@@ -533,7 +533,7 @@
                 for (auto& combination : cameraDeviceIdCombinations) {
                     std::unordered_set<std::string> deviceIds;
                     for (auto &cameraDeviceId : combination) {
-                        deviceIds.insert(cameraDeviceId.c_str());
+                        deviceIds.insert(cameraDeviceId);
                     }
                     mConcurrentCameraIdCombinations.push_back(std::move(deviceIds));
                 }
@@ -837,7 +837,7 @@
     hardware::camera::device::V3_7::StreamConfiguration configuration_3_7;
     bool earlyExit = false;
     auto bRes = SessionConfigurationUtils::convertToHALStreamCombination(configuration,
-            String8(mId.c_str()), mCameraCharacteristics, getMetadata, mPhysicalIds,
+            mId, mCameraCharacteristics, getMetadata, mPhysicalIds,
             configuration_3_7, overrideForPerfClass, &earlyExit);
 
     if (!bRes.isOk()) {
@@ -927,9 +927,9 @@
             return res;
         }
         camera3::metadataGetter getMetadata =
-                [this](const String8 &id, bool overrideForPerfClass) {
+                [this](const std::string &id, bool overrideForPerfClass) {
                     CameraMetadata physicalDeviceInfo;
-                    mManager->getCameraCharacteristicsLocked(id.string(), overrideForPerfClass,
+                    mManager->getCameraCharacteristicsLocked(id, overrideForPerfClass,
                             &physicalDeviceInfo, /*overrideToPortrait*/false);
                     return physicalDeviceInfo;
                 };
@@ -938,7 +938,7 @@
         bStatus =
             SessionConfigurationUtils::convertToHALStreamCombination(
                     cameraIdAndSessionConfig.mSessionConfiguration,
-                    String8(cameraId.c_str()), deviceInfo, getMetadata,
+                    cameraId, deviceInfo, getMetadata,
                     physicalCameraIds, streamConfiguration,
                     overrideForPerfClass, &shouldExit);
         if (!bStatus.isOk()) {
diff --git a/services/camera/libcameraservice/device3/Camera3BufferManager.cpp b/services/camera/libcameraservice/device3/Camera3BufferManager.cpp
index 2ac38d5..c42e51a 100644
--- a/services/camera/libcameraservice/device3/Camera3BufferManager.cpp
+++ b/services/camera/libcameraservice/device3/Camera3BufferManager.cpp
@@ -18,10 +18,13 @@
 #define LOG_TAG "Camera3-BufferManager"
 #define ATRACE_TAG ATRACE_TAG_CAMERA
 
+#include <sstream>
+
 #include <gui/ISurfaceComposer.h>
 #include <private/gui/ComposerService.h>
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 #include "utils/CameraTraces.h"
 #include "Camera3BufferManager.h"
 
@@ -454,34 +457,36 @@
 void Camera3BufferManager::dump(int fd, [[maybe_unused]] const Vector<String16>& args) const {
     Mutex::Autolock l(mLock);
 
-    String8 lines;
-    lines.appendFormat("      Total stream sets: %zu\n", mStreamSetMap.size());
+    std::ostringstream lines;
+    lines << fmt::sprintf("      Total stream sets: %zu\n", mStreamSetMap.size());
     for (size_t i = 0; i < mStreamSetMap.size(); i++) {
-        lines.appendFormat("        Stream set %d(%d) has below streams:\n",
+        lines << fmt::sprintf("        Stream set %d(%d) has below streams:\n",
                 mStreamSetMap.keyAt(i).id, mStreamSetMap.keyAt(i).isMultiRes);
         for (size_t j = 0; j < mStreamSetMap[i].streamInfoMap.size(); j++) {
-            lines.appendFormat("          Stream %d\n", mStreamSetMap[i].streamInfoMap[j].streamId);
+            lines << fmt::sprintf("          Stream %d\n",
+                    mStreamSetMap[i].streamInfoMap[j].streamId);
         }
-        lines.appendFormat("          Stream set max allowed buffer count: %zu\n",
+        lines << fmt::sprintf("          Stream set max allowed buffer count: %zu\n",
                 mStreamSetMap[i].maxAllowedBufferCount);
-        lines.appendFormat("          Stream set buffer count water mark: %zu\n",
+        lines << fmt::sprintf("          Stream set buffer count water mark: %zu\n",
                 mStreamSetMap[i].allocatedBufferWaterMark);
-        lines.appendFormat("          Handout buffer counts:\n");
+        lines << "          Handout buffer counts:\n";
         for (size_t m = 0; m < mStreamSetMap[i].handoutBufferCountMap.size(); m++) {
             int streamId = mStreamSetMap[i].handoutBufferCountMap.keyAt(m);
             size_t bufferCount = mStreamSetMap[i].handoutBufferCountMap.valueAt(m);
-            lines.appendFormat("            stream id: %d, buffer count: %zu.\n",
+            lines << fmt::sprintf("            stream id: %d, buffer count: %zu.\n",
                     streamId, bufferCount);
         }
-        lines.appendFormat("          Attached buffer counts:\n");
+        lines << "          Attached buffer counts:\n";
         for (size_t m = 0; m < mStreamSetMap[i].attachedBufferCountMap.size(); m++) {
             int streamId = mStreamSetMap[i].attachedBufferCountMap.keyAt(m);
             size_t bufferCount = mStreamSetMap[i].attachedBufferCountMap.valueAt(m);
-            lines.appendFormat("            stream id: %d, attached buffer count: %zu.\n",
+            lines << fmt::sprintf("            stream id: %d, attached buffer count: %zu.\n",
                     streamId, bufferCount);
         }
     }
-    write(fd, lines.string(), lines.size());
+    std::string linesStr = std::move(lines.str());
+    write(fd, linesStr.c_str(), linesStr.size());
 }
 
 bool Camera3BufferManager::checkIfStreamRegisteredLocked(int streamId,
diff --git a/services/camera/libcameraservice/device3/Camera3Device.cpp b/services/camera/libcameraservice/device3/Camera3Device.cpp
index 61c3298..a0e2778 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Device.cpp
@@ -26,10 +26,10 @@
 #endif
 
 // Convenience macro for transient errors
-#define CLOGE(fmt, ...) ALOGE("Camera %s: %s: " fmt, mId.string(), __FUNCTION__, \
+#define CLOGE(fmt, ...) ALOGE("Camera %s: %s: " fmt, mId.c_str(), __FUNCTION__, \
             ##__VA_ARGS__)
 
-#define CLOGW(fmt, ...) ALOGW("Camera %s: %s: " fmt, mId.string(), __FUNCTION__, \
+#define CLOGW(fmt, ...) ALOGW("Camera %s: %s: " fmt, mId.c_str(), __FUNCTION__, \
             ##__VA_ARGS__)
 
 // Convenience macros for transitioning to the error state
@@ -44,10 +44,12 @@
 
 #include <utility>
 
+#include <android-base/stringprintf.h>
 #include <utils/Log.h>
 #include <utils/Trace.h>
 #include <utils/Timers.h>
 #include <cutils/properties.h>
+#include <camera/StringUtils.h>
 
 #include <android/hardware/camera/device/3.7/ICameraInjectionSession.h>
 #include <android/hardware/camera2/ICameraDeviceUser.h>
@@ -75,7 +77,8 @@
 namespace android {
 
 Camera3Device::Camera3Device(std::shared_ptr<CameraServiceProxyWrapper>& cameraServiceProxyWrapper,
-        const String8 &id, bool overrideForPerfClass, bool overrideToPortrait, bool legacyClient):
+        const std::string &id, bool overrideForPerfClass, bool overrideToPortrait,
+        bool legacyClient):
         mCameraServiceProxyWrapper(cameraServiceProxyWrapper),
         mId(id),
         mLegacyClient(legacyClient),
@@ -107,17 +110,17 @@
         mActivePhysicalId("")
 {
     ATRACE_CALL();
-    ALOGV("%s: Created device for camera %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Created device for camera %s", __FUNCTION__, mId.c_str());
 }
 
 Camera3Device::~Camera3Device()
 {
     ATRACE_CALL();
-    ALOGV("%s: Tearing down for camera id %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Tearing down for camera id %s", __FUNCTION__, mId.c_str());
     disconnectImpl();
 }
 
-const String8& Camera3Device::getId() const {
+const std::string& Camera3Device::getId() const {
     return mId;
 }
 
@@ -125,7 +128,7 @@
 
     /** Start up status tracker thread */
     mStatusTracker = new StatusTracker(this);
-    status_t res = mStatusTracker->run(String8::format("C3Dev-%s-Status", mId.string()).string());
+    status_t res = mStatusTracker->run((std::string("C3Dev-") + mId + "-Status").c_str());
     if (res != OK) {
         SET_ERR_L("Unable to start status tracking thread: %s (%d)",
                 strerror(-res), res);
@@ -188,7 +191,7 @@
             this, mStatusTracker, mInterface, sessionParamKeys,
             mUseHalBufManager, mSupportCameraMute, mOverrideToPortrait,
             mSupportZoomOverride);
-    res = mRequestThread->run(String8::format("C3Dev-%s-ReqQueue", mId.string()).string());
+    res = mRequestThread->run((std::string("C3Dev-") + mId + "-ReqQueue").c_str());
     if (res != OK) {
         SET_ERR_L("Unable to start request queue thread: %s (%d)",
                 strerror(-res), res);
@@ -225,23 +228,23 @@
 
     bool usePrecorrectArray = DistortionMapper::isDistortionSupported(mDeviceInfo);
     if (usePrecorrectArray) {
-        res = mDistortionMappers[mId.c_str()].setupStaticInfo(mDeviceInfo);
+        res = mDistortionMappers[mId].setupStaticInfo(mDeviceInfo);
         if (res != OK) {
             SET_ERR_L("Unable to read necessary calibration fields for distortion correction");
             return res;
         }
     }
 
-    mZoomRatioMappers[mId.c_str()] = ZoomRatioMapper(&mDeviceInfo,
+    mZoomRatioMappers[mId] = ZoomRatioMapper(&mDeviceInfo,
             mSupportNativeZoomRatio, usePrecorrectArray);
 
     if (SessionConfigurationUtils::supportsUltraHighResolutionCapture(mDeviceInfo)) {
-        mUHRCropAndMeteringRegionMappers[mId.c_str()] =
+        mUHRCropAndMeteringRegionMappers[mId] =
                 UHRCropAndMeteringRegionMapper(mDeviceInfo, usePrecorrectArray);
     }
 
     if (RotateAndCropMapper::isNeeded(&mDeviceInfo)) {
-        mRotateAndCropMappers.emplace(mId.c_str(), &mDeviceInfo);
+        mRotateAndCropMappers.emplace(mId, &mDeviceInfo);
     }
 
     // Hidl/AidlCamera3DeviceInjectionMethods
@@ -428,7 +431,7 @@
                     /*isUltraHighResolution*/true);
     if (maxDefaultJpegResolution.width == 0) {
         ALOGE("%s: Camera %s: Can't find valid available jpeg sizes in static metadata!",
-                __FUNCTION__, mId.string());
+                __FUNCTION__, mId.c_str());
         return BAD_VALUE;
     }
     bool useMaxSensorPixelModeThreshold = false;
@@ -443,7 +446,7 @@
     camera_metadata_ro_entry jpegBufMaxSize = info.find(ANDROID_JPEG_MAX_SIZE);
     if (jpegBufMaxSize.count == 0) {
         ALOGE("%s: Camera %s: Can't find maximum JPEG size in static metadata!", __FUNCTION__,
-                mId.string());
+                mId.c_str());
         return BAD_VALUE;
     }
     maxJpegBufferSize = jpegBufMaxSize.data.i32[0];
@@ -475,7 +478,7 @@
     camera_metadata_ro_entry maxPointCount = info.find(ANDROID_DEPTH_MAX_DEPTH_SAMPLES);
     if (maxPointCount.count == 0) {
         ALOGE("%s: Camera %s: Can't find maximum depth point cloud size in static metadata!",
-                __FUNCTION__, mId.string());
+                __FUNCTION__, mId.c_str());
         return BAD_VALUE;
     }
     ssize_t maxBytesForPointCloud = sizeof(android_depth_points) +
@@ -497,7 +500,7 @@
     size_t count = rawOpaqueSizes.count;
     if (count == 0 || (count % PER_CONFIGURATION_SIZE)) {
         ALOGE("%s: Camera %s: bad opaque RAW size static metadata length(%zu)!",
-                __FUNCTION__, mId.string(), count);
+                __FUNCTION__, mId.c_str(), count);
         return BAD_VALUE;
     }
 
@@ -509,7 +512,7 @@
     }
 
     ALOGE("%s: Camera %s: cannot find size for %dx%d opaque RAW image!",
-            __FUNCTION__, mId.string(), width, height);
+            __FUNCTION__, mId.c_str(), width, height);
     return BAD_VALUE;
 }
 
@@ -523,10 +526,10 @@
 
     ALOGW_IF(!gotInterfaceLock,
             "Camera %s: %s: Unable to lock interface lock, proceeding anyway",
-            mId.string(), __FUNCTION__);
+            mId.c_str(), __FUNCTION__);
     ALOGW_IF(!gotLock,
             "Camera %s: %s: Unable to lock main lock, proceeding anyway",
-            mId.string(), __FUNCTION__);
+            mId.c_str(), __FUNCTION__);
 
     bool dumpTemplates = false;
 
@@ -536,9 +539,9 @@
         if (args[i] == templatesOption) {
             dumpTemplates = true;
         }
-        if (args[i] == TagMonitor::kMonitorOption) {
+        if (args[i] == toString16(TagMonitor::kMonitorOption)) {
             if (i + 1 < n) {
-                String8 monitorTags = String8(args[i + 1]);
+                std::string monitorTags = toStdString(args[i + 1]);
                 if (monitorTags == "off") {
                     mTagMonitor.disableMonitoring();
                 } else {
@@ -550,7 +553,7 @@
         }
     }
 
-    String8 lines;
+    std::string lines;
 
     const char *status =
             mStatus == STATUS_ERROR         ? "ERROR" :
@@ -560,42 +563,42 @@
             mStatus == STATUS_ACTIVE        ? "ACTIVE" :
             "Unknown";
 
-    lines.appendFormat("    Device status: %s\n", status);
+    lines += fmt::sprintf("    Device status: %s\n", status);
     if (mStatus == STATUS_ERROR) {
-        lines.appendFormat("    Error cause: %s\n", mErrorCause.string());
+        lines += fmt::sprintf("    Error cause: %s\n", mErrorCause.c_str());
     }
-    lines.appendFormat("    Stream configuration:\n");
+    lines += "    Stream configuration:\n";
     const char *mode =
             mOperatingMode == CAMERA_STREAM_CONFIGURATION_NORMAL_MODE ? "NORMAL" :
             mOperatingMode == CAMERA_STREAM_CONFIGURATION_CONSTRAINED_HIGH_SPEED_MODE ?
                     "CONSTRAINED_HIGH_SPEED" : "CUSTOM";
-    lines.appendFormat("    Operation mode: %s (%d) \n", mode, mOperatingMode);
+    lines += fmt::sprintf("    Operation mode: %s (%d) \n", mode, mOperatingMode);
 
     if (mInputStream != NULL) {
-        write(fd, lines.string(), lines.size());
+        write(fd, lines.c_str(), lines.size());
         mInputStream->dump(fd, args);
     } else {
-        lines.appendFormat("      No input stream.\n");
-        write(fd, lines.string(), lines.size());
+        lines += "      No input stream.\n";
+        write(fd, lines.c_str(), lines.size());
     }
     for (size_t i = 0; i < mOutputStreams.size(); i++) {
         mOutputStreams[i]->dump(fd,args);
     }
 
     if (mBufferManager != NULL) {
-        lines = String8("    Camera3 Buffer Manager:\n");
-        write(fd, lines.string(), lines.size());
+        lines = "    Camera3 Buffer Manager:\n";
+        write(fd, lines.c_str(), lines.size());
         mBufferManager->dump(fd, args);
     }
 
-    lines = String8("    In-flight requests:\n");
+    lines = "    In-flight requests:\n";
     if (mInFlightLock.try_lock()) {
         if (mInFlightMap.size() == 0) {
-            lines.append("      None\n");
+            lines += "      None\n";
         } else {
             for (size_t i = 0; i < mInFlightMap.size(); i++) {
                 InFlightRequest r = mInFlightMap.valueAt(i);
-                lines.appendFormat("      Frame %d |  Timestamp: %" PRId64 ", metadata"
+                lines += fmt::sprintf("      Frame %d |  Timestamp: %" PRId64 ", metadata"
                         " arrived: %s, buffers left: %d\n", mInFlightMap.keyAt(i),
                         r.shutterTimestamp, r.haveResultMetadata ? "true" : "false",
                         r.numBuffersLeft);
@@ -603,9 +606,9 @@
         }
         mInFlightLock.unlock();
     } else {
-        lines.append("      Failed to acquire In-flight lock!\n");
+        lines += "      Failed to acquire In-flight lock!\n";
     }
-    write(fd, lines.string(), lines.size());
+    write(fd, lines.c_str(), lines.size());
 
     if (mRequestThread != NULL) {
         mRequestThread->dumpCaptureRequestLatency(fd,
@@ -613,8 +616,8 @@
     }
 
     {
-        lines = String8("    Last request sent:\n");
-        write(fd, lines.string(), lines.size());
+        lines = "    Last request sent:\n";
+        write(fd, lines.c_str(), lines.size());
 
         CameraMetadata lastRequest = getLatestRequestLocked();
         lastRequest.dump(fd, /*verbosity*/2, /*indentation*/6);
@@ -634,12 +637,12 @@
             camera_metadata_t *templateRequest = nullptr;
             mInterface->constructDefaultRequestSettings(
                     (camera_request_template_t) i, &templateRequest);
-            lines = String8::format("    HAL Request %s:\n", templateNames[i-1]);
+            lines = fmt::sprintf("    HAL Request %s:\n", templateNames[i-1]);
             if (templateRequest == nullptr) {
-                lines.append("       Not supported\n");
-                write(fd, lines.string(), lines.size());
+                lines += "       Not supported\n";
+                write(fd, lines.c_str(), lines.size());
             } else {
-                write(fd, lines.string(), lines.size());
+                write(fd, lines.c_str(), lines.size());
                 dump_indented_camera_metadata(templateRequest,
                         fd, /*verbosity*/2, /*indentation*/8);
             }
@@ -650,8 +653,8 @@
     mTagMonitor.dumpMonitoredMetadata(fd);
 
     if (mInterface->valid()) {
-        lines = String8("     HAL device dump:\n");
-        write(fd, lines.string(), lines.size());
+        lines = "     HAL device dump:\n";
+        write(fd, lines.c_str(), lines.size());
         mInterface->dump(fd);
     }
 
@@ -661,7 +664,7 @@
     return OK;
 }
 
-status_t Camera3Device::startWatchingTags(const String8 &tags) {
+status_t Camera3Device::startWatchingTags(const std::string &tags) {
     mTagMonitor.parseTagsToMonitor(tags);
     return OK;
 }
@@ -676,7 +679,7 @@
     return OK;
 }
 
-const CameraMetadata& Camera3Device::infoPhysical(const String8& physicalId) const {
+const CameraMetadata& Camera3Device::infoPhysical(const std::string& physicalId) const {
     ALOGVV("%s: E", __FUNCTION__);
     if (CC_UNLIKELY(mStatus == STATUS_UNINITIALIZED ||
                     mStatus == STATUS_ERROR)) {
@@ -684,12 +687,11 @@
                 mStatus == STATUS_ERROR ?
                 "when in error state" : "before init");
     }
-    if (physicalId.isEmpty()) {
+    if (physicalId.empty()) {
         return mDeviceInfo;
     } else {
-        std::string id(physicalId.c_str());
-        if (mPhysicalDeviceInfoMap.find(id) != mPhysicalDeviceInfoMap.end()) {
-            return mPhysicalDeviceInfoMap.at(id);
+        if (mPhysicalDeviceInfoMap.find(physicalId) != mPhysicalDeviceInfoMap.end()) {
+            return mPhysicalDeviceInfoMap.at(physicalId);
         } else {
             ALOGE("%s: Invalid physical camera id %s", __FUNCTION__, physicalId.c_str());
             return mDeviceInfo;
@@ -698,8 +700,7 @@
 }
 
 const CameraMetadata& Camera3Device::info() const {
-    String8 emptyId;
-    return infoPhysical(emptyId);
+    return infoPhysical(/*physicalId*/ std::string());
 }
 
 status_t Camera3Device::checkStatusOkToCaptureLocked() {
@@ -793,7 +794,7 @@
         std::list<const SurfaceMap>& surfaceMaps,
         const CameraMetadata& request) {
     PhysicalCameraSettingsList requestList;
-    requestList.push_back({std::string(getId().string()), request});
+    requestList.push_back({getId(), request});
     requestsList.push_back(requestList);
 
     SurfaceMap surfaceMap;
@@ -845,7 +846,7 @@
             SET_ERR_L("Can't transition to active in %f seconds!",
                     kActiveTimeout/1e9);
         }
-        ALOGV("Camera %s: Capture request %" PRId32 " enqueued", mId.string(),
+        ALOGV("Camera %s: Capture request %" PRId32 " enqueued", mId.c_str(),
               (*(requestList.begin()))->mResultExtras.requestId);
     } else {
         CLOGE("Cannot queue request. Impossible.");
@@ -928,7 +929,7 @@
             SET_ERR_L("Unexpected status: %d", mStatus);
             return INVALID_OPERATION;
     }
-    ALOGV("Camera %s: Clearing repeating request", mId.string());
+    ALOGV("Camera %s: Clearing repeating request", mId.c_str());
 
     return mRequestThread->clearRepeatingRequests(lastFrameNumber);
 }
@@ -947,7 +948,7 @@
     nsecs_t maxExpectedDuration = getExpectedInFlightDuration();
     Mutex::Autolock l(mLock);
     ALOGV("Camera %s: Creating new input stream %d: %d x %d, format %d",
-            mId.string(), mNextStreamId, width, height, format);
+            mId.c_str(), mNextStreamId, width, height, format);
 
     status_t res;
     bool wasActive = false;
@@ -1006,14 +1007,14 @@
         internalResumeLocked();
     }
 
-    ALOGV("Camera %s: Created input stream", mId.string());
+    ALOGV("Camera %s: Created input stream", mId.c_str());
     return OK;
 }
 
 status_t Camera3Device::createStream(sp<Surface> consumer,
             uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation, int *id,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds, int streamSetId, bool isShared, bool isMultiResolution,
             uint64_t consumerUsage, int64_t dynamicRangeProfile, int64_t streamUseCase,
@@ -1049,7 +1050,8 @@
 status_t Camera3Device::createStream(const std::vector<sp<Surface>>& consumers,
         bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
         android_dataspace dataSpace, camera_stream_rotation_t rotation, int *id,
-        const String8& physicalCameraId, const std::unordered_set<int32_t> &sensorPixelModesUsed,
+        const std::string& physicalCameraId,
+        const std::unordered_set<int32_t> &sensorPixelModesUsed,
         std::vector<int> *surfaceIds, int streamSetId, bool isShared, bool isMultiResolution,
         uint64_t consumerUsage, int64_t dynamicRangeProfile, int64_t streamUseCase,
         int timestampBase, int mirrorMode, int32_t colorSpace, bool useReadoutTimestamp) {
@@ -1062,8 +1064,8 @@
             " consumer usage %" PRIu64 ", isShared %d, physicalCameraId %s, isMultiResolution %d"
             " dynamicRangeProfile 0x%" PRIx64 ", streamUseCase %" PRId64 ", timestampBase %d,"
             " mirrorMode %d, colorSpace %d, useReadoutTimestamp %d",
-            mId.string(), mNextStreamId, width, height, format, dataSpace, rotation,
-            consumerUsage, isShared, physicalCameraId.string(), isMultiResolution,
+            mId.c_str(), mNextStreamId, width, height, format, dataSpace, rotation,
+            consumerUsage, isShared, physicalCameraId.c_str(), isMultiResolution,
             dynamicRangeProfile, streamUseCase, timestampBase, mirrorMode, colorSpace,
             useReadoutTimestamp);
 
@@ -1214,7 +1216,7 @@
         }
         internalResumeLocked();
     }
-    ALOGV("Camera %s: Created new stream", mId.string());
+    ALOGV("Camera %s: Created new stream", mId.c_str());
     return OK;
 }
 
@@ -1299,18 +1301,18 @@
     Mutex::Autolock l(mLock);
     status_t res;
 
-    ALOGV("%s: Camera %s: Deleting stream %d", __FUNCTION__, mId.string(), id);
+    ALOGV("%s: Camera %s: Deleting stream %d", __FUNCTION__, mId.c_str(), id);
 
     // CameraDevice semantics require device to already be idle before
     // deleteStream is called, unlike for createStream.
     if (mStatus == STATUS_ACTIVE) {
-        ALOGW("%s: Camera %s: Device not idle", __FUNCTION__, mId.string());
+        ALOGW("%s: Camera %s: Device not idle", __FUNCTION__, mId.c_str());
         return -EBUSY;
     }
 
     if (mStatus == STATUS_ERROR) {
         ALOGW("%s: Camera %s: deleteStream not allowed in ERROR state",
-                __FUNCTION__, mId.string());
+                __FUNCTION__, mId.c_str());
         return -EBUSY;
     }
 
@@ -1502,7 +1504,7 @@
         mRequestTemplateCache[templateId].acquire(rawRequest);
 
         // Override the template request with zoomRatioMapper
-        res = mZoomRatioMappers[mId.c_str()].initZoomRatioInTemplate(
+        res = mZoomRatioMappers[mId].initZoomRatioInTemplate(
                 &mRequestTemplateCache[templateId]);
         if (res != OK) {
             CLOGE("Failed to update zoom ratio for template %d: %s (%d)",
@@ -1555,7 +1557,7 @@
             SET_ERR_L("Unexpected status: %d",mStatus);
             return INVALID_OPERATION;
     }
-    ALOGV("%s: Camera %s: Waiting until idle (%" PRIi64 "ns)", __FUNCTION__, mId.string(),
+    ALOGV("%s: Camera %s: Waiting until idle (%" PRIi64 "ns)", __FUNCTION__, mId.c_str(),
             maxExpectedDuration);
     status_t res = waitUntilStateThenRelock(/*active*/ false, maxExpectedDuration,
                            /*requestThreadInvocation*/ false);
@@ -1583,7 +1585,7 @@
         return NO_INIT;
     }
 
-    ALOGV("%s: Camera %s: Internal wait until idle (% " PRIi64 " ns)", __FUNCTION__, mId.string(),
+    ALOGV("%s: Camera %s: Internal wait until idle (% " PRIi64 " ns)", __FUNCTION__, mId.c_str(),
           maxExpectedDuration);
     status_t res = waitUntilStateThenRelock(/*active*/ false, maxExpectedDuration,
                            requestThreadInvocation);
@@ -1602,7 +1604,7 @@
 
     mRequestThread->setPaused(false);
 
-    ALOGV("%s: Camera %s: Internal wait until active (% " PRIi64 " ns)", __FUNCTION__, mId.string(),
+    ALOGV("%s: Camera %s: Internal wait until active (% " PRIi64 " ns)", __FUNCTION__, mId.c_str(),
             kActiveTimeout);
     // internalResumeLocked is always called from a binder thread.
     res = waitUntilStateThenRelock(/*active*/ true, kActiveTimeout,
@@ -1819,7 +1821,7 @@
 
 status_t Camera3Device::flush(int64_t *frameNumber) {
     ATRACE_CALL();
-    ALOGV("%s: Camera %s: Flushing all requests", __FUNCTION__, mId.string());
+    ALOGV("%s: Camera %s: Flushing all requests", __FUNCTION__, mId.c_str());
     Mutex::Autolock il(mInterfaceLock);
 
     {
@@ -1851,7 +1853,7 @@
 
 status_t Camera3Device::prepare(int maxCount, int streamId) {
     ATRACE_CALL();
-    ALOGV("%s: Camera %s: Preparing stream %d", __FUNCTION__, mId.string(), streamId);
+    ALOGV("%s: Camera %s: Preparing stream %d", __FUNCTION__, mId.c_str(), streamId);
     Mutex::Autolock il(mInterfaceLock);
     Mutex::Autolock l(mLock);
 
@@ -1876,7 +1878,7 @@
 
 status_t Camera3Device::tearDown(int streamId) {
     ATRACE_CALL();
-    ALOGV("%s: Camera %s: Tearing down stream %d", __FUNCTION__, mId.string(), streamId);
+    ALOGV("%s: Camera %s: Tearing down stream %d", __FUNCTION__, mId.c_str(), streamId);
     Mutex::Autolock il(mInterfaceLock);
     Mutex::Autolock l(mLock);
 
@@ -1897,7 +1899,8 @@
 status_t Camera3Device::addBufferListenerForStream(int streamId,
         wp<Camera3StreamBufferListener> listener) {
     ATRACE_CALL();
-    ALOGV("%s: Camera %s: Adding buffer listener for stream %d", __FUNCTION__, mId.string(), streamId);
+    ALOGV("%s: Camera %s: Adding buffer listener for stream %d", __FUNCTION__, mId.c_str(),
+            streamId);
     Mutex::Autolock il(mInterfaceLock);
     Mutex::Autolock l(mLock);
 
@@ -1945,7 +1948,7 @@
         if (mStatus != STATUS_ACTIVE && mStatus != STATUS_CONFIGURED) {
             return;
         }
-        ALOGV("%s: Camera %s: Now %s, pauseState: %s", __FUNCTION__, mId.string(),
+        ALOGV("%s: Camera %s: Now %s, pauseState: %s", __FUNCTION__, mId.c_str(),
                 idle ? "idle" : "active", mPauseStateNotify ? "true" : "false");
         internalUpdateStatusLocked(idle ? STATUS_CONFIGURED : STATUS_ACTIVE);
 
@@ -2026,7 +2029,7 @@
         const std::vector<sp<Surface>>& consumers, std::vector<int> *surfaceIds) {
     ATRACE_CALL();
     ALOGV("%s: Camera %s: set consumer surface for stream %d",
-            __FUNCTION__, mId.string(), streamId);
+            __FUNCTION__, mId.c_str(), streamId);
 
     if (surfaceIds == nullptr) {
         return BAD_VALUE;
@@ -2306,7 +2309,7 @@
 
     res = mPreparerThread->resume();
     if (res != OK) {
-        ALOGE("%s: Camera %s: Preparer thread failed to resume!", __FUNCTION__, mId.string());
+        ALOGE("%s: Camera %s: Preparer thread failed to resume!", __FUNCTION__, mId.c_str());
     }
 }
 
@@ -2466,7 +2469,7 @@
     overrideStreamUseCaseLocked();
 
     // Start configuring the streams
-    ALOGV("%s: Camera %s: Starting stream configuration", __FUNCTION__, mId.string());
+    ALOGV("%s: Camera %s: Starting stream configuration", __FUNCTION__, mId.c_str());
 
     mPreparerThread->pause();
 
@@ -2522,7 +2525,7 @@
                      static_cast<android_dataspace_t>(
                          aidl::android::hardware::graphics::common::Dataspace::JPEG_R))) {
                 bufferSizes[k] = static_cast<uint32_t>(
-                        getJpegBufferSize(infoPhysical(String8(outputStream->physical_camera_id)),
+                        getJpegBufferSize(infoPhysical(outputStream->physical_camera_id),
                                 outputStream->width, outputStream->height));
             } else if (outputStream->data_space ==
                     static_cast<android_dataspace>(HAL_DATASPACE_JPEG_APP_SEGMENTS)) {
@@ -2535,7 +2538,7 @@
 
         if (mOutputStreams[i]->isMultiResolution()) {
             int32_t streamGroupId = mOutputStreams[i]->getHalStreamGroupId();
-            const String8& physicalCameraId = mOutputStreams[i]->getPhysicalCameraId();
+            const std::string &physicalCameraId = mOutputStreams[i]->getPhysicalCameraId();
             mGroupIdPhysicalCameraMap[streamGroupId].insert(physicalCameraId);
         }
 
@@ -2650,14 +2653,14 @@
     internalUpdateStatusLocked((mFakeStreamId == NO_STREAM) ?
             STATUS_CONFIGURED : STATUS_UNCONFIGURED);
 
-    ALOGV("%s: Camera %s: Stream configuration complete", __FUNCTION__, mId.string());
+    ALOGV("%s: Camera %s: Stream configuration complete", __FUNCTION__, mId.c_str());
 
     // tear down the deleted streams after configure streams.
     mDeletedStreams.clear();
 
     auto rc = mPreparerThread->resume();
     if (rc != OK) {
-        SET_ERR_L("%s: Camera %s: Preparer thread failed to resume!", __FUNCTION__, mId.string());
+        SET_ERR_L("%s: Camera %s: Preparer thread failed to resume!", __FUNCTION__, mId.c_str());
         return rc;
     }
 
@@ -2671,7 +2674,7 @@
     // configure the injection streams.
     if (mInjectionMethods->isInjecting()) {
         ALOGD("%s: Injection camera %s: Start to configure streams.",
-              __FUNCTION__, mInjectionMethods->getInjectedCamId().string());
+              __FUNCTION__, mInjectionMethods->getInjectedCamId().c_str());
         res = mInjectionMethods->injectCamera(config, bufferSizes);
         if (res != OK) {
             ALOGE("Can't finish inject camera process!");
@@ -2700,11 +2703,11 @@
         // Should never be adding a second fake stream when one is already
         // active
         SET_ERR_L("%s: Camera %s: A fake stream already exists!",
-                __FUNCTION__, mId.string());
+                __FUNCTION__, mId.c_str());
         return INVALID_OPERATION;
     }
 
-    ALOGV("%s: Camera %s: Adding a fake stream", __FUNCTION__, mId.string());
+    ALOGV("%s: Camera %s: Adding a fake stream", __FUNCTION__, mId.c_str());
 
     sp<Camera3OutputStreamInterface> fakeStream =
             new Camera3FakeStream(mNextStreamId);
@@ -2728,7 +2731,7 @@
     if (mFakeStreamId == NO_STREAM) return OK;
     if (mOutputStreams.size() == 1) return OK;
 
-    ALOGV("%s: Camera %s: Removing the fake stream", __FUNCTION__, mId.string());
+    ALOGV("%s: Camera %s: Removing the fake stream", __FUNCTION__, mId.c_str());
 
     // Ok, have a fake stream and there's at least one other output stream,
     // so remove the fake
@@ -2780,8 +2783,9 @@
 
 void Camera3Device::setErrorStateLockedV(const char *fmt, va_list args) {
     // Print out all error messages to log
-    String8 errorCause = String8::formatV(fmt, args);
-    ALOGE("Camera %s: %s", mId.string(), errorCause.string());
+    std::string errorCause;
+    base::StringAppendV(&errorCause, fmt, args);
+    ALOGE("Camera %s: %s", mId.c_str(), errorCause.c_str());
 
     // But only do error state transition steps for the first error
     if (mStatus == STATUS_ERROR || mStatus == STATUS_UNINITIALIZED) return;
@@ -2813,7 +2817,7 @@
 status_t Camera3Device::registerInFlight(uint32_t frameNumber,
         int32_t numBuffers, CaptureResultExtras resultExtras, bool hasInput,
         bool hasAppCallback, nsecs_t minExpectedDuration, nsecs_t maxExpectedDuration,
-        bool isFixedFps, const std::set<std::set<String8>>& physicalCameraIds,
+        bool isFixedFps, const std::set<std::set<std::string>>& physicalCameraIds,
         bool isStillCapture, bool isZslCapture, bool rotateAndCropAuto, bool autoframingAuto,
         const std::set<std::string>& cameraIdsWithZoom,
         const SurfaceMap& outputSurfaces, nsecs_t requestTimeNs) {
@@ -3064,7 +3068,7 @@
 
 void Camera3Device::RequestThread::configurationComplete(bool isConstrainedHighSpeed,
         const CameraMetadata& sessionParams,
-        const std::map<int32_t, std::set<String8>>& groupIdPhysicalCameraMap) {
+        const std::map<int32_t, std::set<std::string>>& groupIdPhysicalCameraMap) {
     ATRACE_CALL();
     Mutex::Autolock l(mRequestLock);
     mReconfigured = true;
@@ -3117,8 +3121,8 @@
     return OK;
 }
 
-const String8& Camera3Device::RequestThread::getId(const wp<Camera3Device> &device) {
-    static String8 deadId("<DeadDevice>");
+const std::string& Camera3Device::RequestThread::getId(const wp<Camera3Device> &device) {
+    static std::string deadId("<DeadDevice>");
     sp<Camera3Device> d = device.promote();
     if (d != nullptr) return d->mId;
     return deadId;
@@ -3928,7 +3932,7 @@
         outputBuffers->insertAt(camera_stream_buffer_t(), 0,
                 captureRequest->mOutputStreams.size());
         halRequest->output_buffers = outputBuffers->array();
-        std::set<std::set<String8>> requestedPhysicalCameras;
+        std::set<std::set<std::string>> requestedPhysicalCameras;
 
         sp<Camera3Device> parent = mParent.promote();
         if (parent == NULL) {
@@ -4009,11 +4013,11 @@
             {
                 sp<Camera3Device> parent = mParent.promote();
                 if (parent != nullptr) {
-                    const String8& streamCameraId = outputStream->getPhysicalCameraId();
+                    const std::string& streamCameraId = outputStream->getPhysicalCameraId();
                     for (const auto& settings : captureRequest->mSettingsList) {
-                        if ((streamCameraId.isEmpty() &&
-                                parent->getId() == settings.cameraId.c_str()) ||
-                                streamCameraId == settings.cameraId.c_str()) {
+                        if ((streamCameraId.empty() &&
+                                parent->getId() == settings.cameraId) ||
+                                streamCameraId == settings.cameraId) {
                             outputStream->fireBufferRequestForFrameNumber(
                                     captureRequest->mResultExtras.frameNumber,
                                     settings.metadata);
@@ -4022,12 +4026,12 @@
                 }
             }
 
-            String8 physicalCameraId = outputStream->getPhysicalCameraId();
+            const std::string &physicalCameraId = outputStream->getPhysicalCameraId();
             int32_t streamGroupId = outputStream->getHalStreamGroupId();
             if (streamGroupId != -1 && mGroupIdPhysicalCameraMap.count(streamGroupId) == 1) {
                 requestedPhysicalCameras.insert(mGroupIdPhysicalCameraMap[streamGroupId]);
-            } else if (!physicalCameraId.isEmpty()) {
-                requestedPhysicalCameras.insert(std::set<String8>({physicalCameraId}));
+            } else if (!physicalCameraId.empty()) {
+                requestedPhysicalCameras.insert(std::set<std::string>({physicalCameraId}));
             }
             halRequest->num_output_buffers++;
         }
@@ -5456,9 +5460,9 @@
     return mRequestThread->setZoomOverride(zoomOverride);
 }
 
-status_t Camera3Device::injectCamera(const String8& injectedCamId,
+status_t Camera3Device::injectCamera(const std::string& injectedCamId,
                                      sp<CameraProviderManager> manager) {
-    ALOGI("%s Injection camera: injectedCamId = %s", __FUNCTION__, injectedCamId.string());
+    ALOGI("%s Injection camera: injectedCamId = %s", __FUNCTION__, injectedCamId.c_str());
     ATRACE_CALL();
     Mutex::Autolock il(mInterfaceLock);
     // When the camera device is active, injectCamera() and stopInjection() will call
diff --git a/services/camera/libcameraservice/device3/Camera3Device.h b/services/camera/libcameraservice/device3/Camera3Device.h
index b1dd135..0c1bbcb 100644
--- a/services/camera/libcameraservice/device3/Camera3Device.h
+++ b/services/camera/libcameraservice/device3/Camera3Device.h
@@ -85,7 +85,7 @@
   public:
 
     explicit Camera3Device(std::shared_ptr<CameraServiceProxyWrapper>& cameraServiceProxyWrapper,
-            const String8& id, bool overrideForPerfClass, bool overrideToPortrait,
+            const std::string& id, bool overrideForPerfClass, bool overrideToPortrait,
             bool legacyClient = false);
 
     virtual ~Camera3Device();
@@ -101,7 +101,7 @@
      * CameraDeviceBase interface
      */
 
-    const String8& getId() const override;
+    const std::string& getId() const override;
 
     metadata_vendor_id_t getVendorTagId() const override { return mVendorTagId; }
 
@@ -110,15 +110,15 @@
 
     // Transitions to idle state on success.
     virtual status_t initialize(sp<CameraProviderManager> /*manager*/,
-            const String8& /*monitorTags*/) = 0;
+            const std::string& /*monitorTags*/) = 0;
 
     status_t disconnect() override;
     status_t dump(int fd, const Vector<String16> &args) override;
-    status_t startWatchingTags(const String8 &tags) override;
+    status_t startWatchingTags(const std::string &tags) override;
     status_t stopWatchingTags() override;
     status_t dumpWatchedEventsToVector(std::vector<std::string> &out) override;
     const CameraMetadata& info() const override;
-    const CameraMetadata& infoPhysical(const String8& physicalId) const override;
+    const CameraMetadata& infoPhysical(const std::string& physicalId) const override;
     bool isCompositeJpegRDisabled() const override { return mIsCompositeJpegRDisabled; };
 
     // Capture and setStreamingRequest will configure streams if currently in
@@ -144,7 +144,7 @@
     status_t createStream(sp<Surface> consumer,
             uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation, int *id,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds = nullptr,
             int streamSetId = camera3::CAMERA3_STREAM_SET_ID_INVALID,
@@ -162,7 +162,7 @@
     status_t createStream(const std::vector<sp<Surface>>& consumers,
             bool hasDeferredConsumer, uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation, int *id,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             std::vector<int> *surfaceIds = nullptr,
             int streamSetId = camera3::CAMERA3_STREAM_SET_ID_INVALID,
@@ -330,7 +330,7 @@
      * The injection camera session to replace the internal camera
      * session.
      */
-    status_t injectCamera(const String8& injectedCamId,
+    status_t injectCamera(const std::string& injectedCamId,
                           sp<CameraProviderManager> manager);
 
     /**
@@ -376,7 +376,7 @@
     Mutex                      mLock;
 
     // Camera device ID
-    const String8              mId;
+    const std::string          mId;
 
     // Legacy camera client flag
     bool                       mLegacyClient;
@@ -586,14 +586,14 @@
     Condition                  mStatusChanged;
 
     // Tracking cause of fatal errors when in STATUS_ERROR
-    String8                    mErrorCause;
+    std::string                mErrorCause;
 
     camera3::StreamSet         mOutputStreams;
     sp<camera3::Camera3Stream> mInputStream;
     bool                       mIsInputStreamMultiResolution;
     SessionStatsBuilder        mSessionStatsBuilder;
     // Map from stream group ID to physical cameras backing the stream group
-    std::map<int32_t, std::set<String8>> mGroupIdPhysicalCameraMap;
+    std::map<int32_t, std::set<std::string>> mGroupIdPhysicalCameraMap;
 
     int                        mNextStreamId;
     bool                       mNeedConfig;
@@ -709,7 +709,7 @@
      */
     virtual CameraMetadata getLatestRequestLocked();
 
-    virtual status_t injectionCameraInitialize(const String8 &injectCamId,
+    virtual status_t injectionCameraInitialize(const std::string &injectCamId,
             sp<CameraProviderManager> manager) = 0;
 
     /**
@@ -891,7 +891,7 @@
          */
         void     configurationComplete(bool isConstrainedHighSpeed,
                 const CameraMetadata& sessionParams,
-                const std::map<int32_t, std::set<String8>>& groupIdPhysicalCameraMap);
+                const std::map<int32_t, std::set<std::string>>& groupIdPhysicalCameraMap);
 
         /**
          * Set or clear the list of repeating requests. Does not block
@@ -996,7 +996,7 @@
 
         virtual bool threadLoop();
 
-        static const String8& getId(const wp<Camera3Device> &device);
+        static const std::string& getId(const wp<Camera3Device> &device);
 
         status_t           queueTriggerLocked(RequestTrigger trigger);
         // Mix-in queued triggers into this request
@@ -1102,7 +1102,7 @@
 
         wp<NotificationListener> mListener;
 
-        const String8      mId;       // The camera ID
+        const std::string  mId;       // The camera ID
         int                mStatusId; // The RequestThread's component ID for
                                       // status tracking
 
@@ -1173,7 +1173,7 @@
         Vector<int32_t>    mSessionParamKeys;
         CameraMetadata     mLatestSessionParams;
 
-        std::map<int32_t, std::set<String8>> mGroupIdPhysicalCameraMap;
+        std::map<int32_t, std::set<std::string>> mGroupIdPhysicalCameraMap;
 
         const bool         mUseHalBufManager;
         const bool         mSupportCameraMute;
@@ -1209,7 +1209,7 @@
     status_t registerInFlight(uint32_t frameNumber,
             int32_t numBuffers, CaptureResultExtras resultExtras, bool hasInput,
             bool callback, nsecs_t minExpectedDuration, nsecs_t maxExpectedDuration,
-            bool isFixedFps, const std::set<std::set<String8>>& physicalCameraIds,
+            bool isFixedFps, const std::set<std::set<std::string>>& physicalCameraIds,
             bool isStillCapture, bool isZslCapture, bool rotateAndCropAuto, bool autoframingAuto,
             const std::set<std::string>& cameraIdsWithZoom, const SurfaceMap& outputSurfaces,
             nsecs_t requestTimeNs);
@@ -1503,7 +1503,7 @@
 
         bool isStreamConfigCompleteButNotInjected();
 
-        const String8& getInjectedCamId() const;
+        const std::string& getInjectedCamId() const;
 
         void getInjectionConfig(/*out*/ camera3::camera_stream_configuration* injectionConfig,
                 /*out*/ std::vector<uint32_t>* injectionBufferSizes);
@@ -1557,7 +1557,7 @@
         Mutex mInjectionLock;
 
         // The injection camera ID.
-        String8 mInjectedCamId;
+        std::string mInjectedCamId;
     };
 
     virtual sp<Camera3DeviceInjectionMethods>
diff --git a/services/camera/libcameraservice/device3/Camera3DeviceInjectionMethods.cpp b/services/camera/libcameraservice/device3/Camera3DeviceInjectionMethods.cpp
index ab772d4..b0e4ca3 100644
--- a/services/camera/libcameraservice/device3/Camera3DeviceInjectionMethods.cpp
+++ b/services/camera/libcameraservice/device3/Camera3DeviceInjectionMethods.cpp
@@ -157,7 +157,7 @@
     return mIsStreamConfigCompleteButNotInjected;
 }
 
-const String8& Camera3Device::Camera3DeviceInjectionMethods::getInjectedCamId()
+const std::string& Camera3Device::Camera3DeviceInjectionMethods::getInjectedCamId()
         const {
     return mInjectedCamId;
 }
@@ -206,7 +206,7 @@
 
     // Start configuring the streams
     ALOGV("%s: Injection camera %s: Starting stream configuration", __FUNCTION__,
-            mInjectedCamId.string());
+            mInjectedCamId.c_str());
 
     parent->mPreparerThread->pause();
 
@@ -249,12 +249,12 @@
     parent->internalUpdateStatusLocked(STATUS_CONFIGURED);
 
     ALOGV("%s: Injection camera %s: Stream configuration complete", __FUNCTION__,
-            mInjectedCamId.string());
+            mInjectedCamId.c_str());
 
     auto rc = parent->mPreparerThread->resume();
     if (rc != OK) {
         ALOGE("%s: Injection camera %s: Preparer thread failed to resume!",
-                 __FUNCTION__, mInjectedCamId.string());
+                 __FUNCTION__, mInjectedCamId.c_str());
         return rc;
     }
 
diff --git a/services/camera/libcameraservice/device3/Camera3FakeStream.cpp b/services/camera/libcameraservice/device3/Camera3FakeStream.cpp
index 8c0ac71..75162bf 100644
--- a/services/camera/libcameraservice/device3/Camera3FakeStream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3FakeStream.cpp
@@ -20,13 +20,14 @@
 
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 #include "Camera3FakeStream.h"
 
 namespace android {
 
 namespace camera3 {
 
-const String8 Camera3FakeStream::FAKE_ID;
+const std::string Camera3FakeStream::FAKE_ID;
 
 Camera3FakeStream::Camera3FakeStream(int id) :
         Camera3IOStreamBase(id, CAMERA_STREAM_OUTPUT, FAKE_WIDTH, FAKE_HEIGHT,
@@ -68,9 +69,9 @@
 }
 
 void Camera3FakeStream::dump(int fd, [[maybe_unused]] const Vector<String16> &args) const {
-    String8 lines;
-    lines.appendFormat("    Stream[%d]: Fake\n", mId);
-    write(fd, lines.string(), lines.size());
+    std::string lines;
+    lines += fmt::sprintf("    Stream[%d]: Fake\n", mId);
+    write(fd, lines.c_str(), lines.size());
 
     Camera3IOStreamBase::dump(fd, args);
 }
@@ -115,7 +116,7 @@
     return OK;
 }
 
-const String8& Camera3FakeStream::getPhysicalCameraId() const {
+const std::string& Camera3FakeStream::getPhysicalCameraId() const {
     return FAKE_ID;
 }
 
diff --git a/services/camera/libcameraservice/device3/Camera3FakeStream.h b/services/camera/libcameraservice/device3/Camera3FakeStream.h
index 1e9f478..1d82190 100644
--- a/services/camera/libcameraservice/device3/Camera3FakeStream.h
+++ b/services/camera/libcameraservice/device3/Camera3FakeStream.h
@@ -65,7 +65,7 @@
     /**
      * Query the physical camera id for the output stream.
      */
-    virtual const String8& getPhysicalCameraId() const override;
+    virtual const std::string& getPhysicalCameraId() const override;
 
     /**
      * Return if this output stream is for video encoding.
@@ -130,7 +130,7 @@
     static const android_dataspace FAKE_DATASPACE = HAL_DATASPACE_UNKNOWN;
     static const camera_stream_rotation_t FAKE_ROTATION = CAMERA_STREAM_ROTATION_0;
     static const uint64_t FAKE_USAGE = GRALLOC_USAGE_HW_COMPOSER;
-    static const String8 FAKE_ID;
+    static const std::string FAKE_ID;
 
     /**
      * Internal Camera3Stream interface
diff --git a/services/camera/libcameraservice/device3/Camera3IOStreamBase.cpp b/services/camera/libcameraservice/device3/Camera3IOStreamBase.cpp
index fbaaf7b..c59138c 100644
--- a/services/camera/libcameraservice/device3/Camera3IOStreamBase.cpp
+++ b/services/camera/libcameraservice/device3/Camera3IOStreamBase.cpp
@@ -18,10 +18,13 @@
 #define ATRACE_TAG ATRACE_TAG_CAMERA
 //#define LOG_NDEBUG 0
 
+#include <sstream>
+
 #include <inttypes.h>
 
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 #include "device3/Camera3IOStreamBase.h"
 #include "device3/StatusTracker.h"
 
@@ -32,7 +35,7 @@
 Camera3IOStreamBase::Camera3IOStreamBase(int id, camera_stream_type_t type,
         uint32_t width, uint32_t height, size_t maxSize, int format,
         android_dataspace dataSpace, camera_stream_rotation_t rotation,
-        const String8& physicalCameraId,
+        const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed,
         int setId, bool isMultiResolution, int64_t dynamicRangeProfile, int64_t streamUseCase,
         bool deviceTimeBaseIsRealtime, int timestampBase, int32_t colorSpace) :
@@ -75,32 +78,34 @@
 }
 
 void Camera3IOStreamBase::dump(int fd, [[maybe_unused]] const Vector<String16> &args) const {
-    String8 lines;
+    std::ostringstream lines;
 
     uint64_t consumerUsage = 0;
     status_t res = getEndpointUsage(&consumerUsage);
     if (res != OK) consumerUsage = 0;
 
-    lines.appendFormat("      State: %d\n", mState);
-    lines.appendFormat("      Dims: %d x %d, format 0x%x, dataspace 0x%x\n",
+    lines << fmt::sprintf("      State: %d\n", mState);
+    lines << fmt::sprintf("      Dims: %d x %d, format 0x%x, dataspace 0x%x\n",
             camera_stream::width, camera_stream::height,
             camera_stream::format, camera_stream::data_space);
-    lines.appendFormat("      Max size: %zu\n", mMaxSize);
-    lines.appendFormat("      Combined usage: 0x%" PRIx64 ", max HAL buffers: %d\n",
+    lines << fmt::sprintf("      Max size: %zu\n", mMaxSize);
+    lines << fmt::sprintf("      Combined usage: 0x%" PRIx64 ", max HAL buffers: %d\n",
             mUsage | consumerUsage, camera_stream::max_buffers);
-    if (strlen(camera_stream::physical_camera_id) > 0) {
-        lines.appendFormat("      Physical camera id: %s\n", camera_stream::physical_camera_id);
+    if (!camera_stream::physical_camera_id.empty()) {
+        lines << "      Physical camera id: " << camera_stream::physical_camera_id << "\n";
     }
-    lines.appendFormat("      Dynamic Range Profile: 0x%" PRIx64 "\n",
+    lines << fmt::sprintf("      Dynamic Range Profile: 0x%" PRIx64 "\n",
             camera_stream::dynamic_range_profile);
-    lines.appendFormat("      Color Space: %d\n", camera_stream::color_space);
-    lines.appendFormat("      Stream use case: %" PRId64 "\n", camera_stream::use_case);
-    lines.appendFormat("      Timestamp base: %d\n", getTimestampBase());
-    lines.appendFormat("      Frames produced: %d, last timestamp: %" PRId64 " ns\n",
+    lines << fmt::sprintf("      Color Space: %d\n", camera_stream::color_space);
+    lines << fmt::sprintf("      Stream use case: %" PRId64 "\n", camera_stream::use_case);
+    lines << fmt::sprintf("      Timestamp base: %d\n", getTimestampBase());
+    lines << fmt::sprintf("      Frames produced: %d, last timestamp: %" PRId64 " ns\n",
             mFrameCount, mLastTimestamp);
-    lines.appendFormat("      Total buffers: %zu, currently dequeued: %zu, currently cached: %zu\n",
-            mTotalBufferCount, mHandoutTotalBufferCount, mCachedOutputBufferCount);
-    write(fd, lines.string(), lines.size());
+    lines << fmt::sprintf("      Total buffers: %zu, currently dequeued: %zu, "
+            "currently cached: %zu\n", mTotalBufferCount, mHandoutTotalBufferCount,
+            mCachedOutputBufferCount);
+    std::string linesStr = std::move(lines.str());
+    write(fd, linesStr.c_str(), linesStr.size());
 
     Camera3Stream::dump(fd, args);
 }
@@ -268,7 +273,7 @@
     // carry on
 
     if (releaseFence != 0) {
-        mCombinedFence = Fence::merge(mName, mCombinedFence, releaseFence);
+        mCombinedFence = Fence::merge(toString8(mName), mCombinedFence, releaseFence);
     }
 
     if (output) {
diff --git a/services/camera/libcameraservice/device3/Camera3IOStreamBase.h b/services/camera/libcameraservice/device3/Camera3IOStreamBase.h
index 6af0875..239fc71 100644
--- a/services/camera/libcameraservice/device3/Camera3IOStreamBase.h
+++ b/services/camera/libcameraservice/device3/Camera3IOStreamBase.h
@@ -35,7 +35,7 @@
     Camera3IOStreamBase(int id, camera_stream_type_t type,
             uint32_t width, uint32_t height, size_t maxSize, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             int setId = CAMERA3_STREAM_SET_ID_INVALID, bool isMultiResolution = false,
             int64_t dynamicProfile = ANDROID_REQUEST_AVAILABLE_DYNAMIC_RANGE_PROFILES_MAP_STANDARD,
diff --git a/services/camera/libcameraservice/device3/Camera3InputStream.cpp b/services/camera/libcameraservice/device3/Camera3InputStream.cpp
index 631bb43..54ffbd7 100644
--- a/services/camera/libcameraservice/device3/Camera3InputStream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3InputStream.cpp
@@ -21,13 +21,14 @@
 #include <gui/BufferItem.h>
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 #include "Camera3InputStream.h"
 
 namespace android {
 
 namespace camera3 {
 
-const String8 Camera3InputStream::FAKE_ID;
+const std::string Camera3InputStream::FAKE_ID;
 
 Camera3InputStream::Camera3InputStream(int id,
         uint32_t width, uint32_t height, int format) :
@@ -216,9 +217,9 @@
 }
 
 void Camera3InputStream::dump(int fd, [[maybe_unused]] const Vector<String16> &args) const {
-    String8 lines;
-    lines.appendFormat("    Stream[%d]: Input\n", mId);
-    write(fd, lines.string(), lines.size());
+    std::string lines;
+    lines += fmt::sprintf("    Stream[%d]: Input\n", mId);
+    write(fd, lines.c_str(), lines.size());
 
     Camera3IOStreamBase::dump(fd, args);
 }
diff --git a/services/camera/libcameraservice/device3/Camera3InputStream.h b/services/camera/libcameraservice/device3/Camera3InputStream.h
index 5e0587b..d4f4b15 100644
--- a/services/camera/libcameraservice/device3/Camera3InputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3InputStream.h
@@ -53,7 +53,7 @@
     sp<IGraphicBufferProducer> mProducer;
     Vector<BufferItem> mBuffersInFlight;
 
-    static const String8 FAKE_ID;
+    static const std::string FAKE_ID;
 
     /**
      * Camera3IOStreamBase
diff --git a/services/camera/libcameraservice/device3/Camera3OfflineSession.cpp b/services/camera/libcameraservice/device3/Camera3OfflineSession.cpp
index 1e7bd57..172b62a 100644
--- a/services/camera/libcameraservice/device3/Camera3OfflineSession.cpp
+++ b/services/camera/libcameraservice/device3/Camera3OfflineSession.cpp
@@ -27,7 +27,9 @@
 
 #include <inttypes.h>
 
+#include <android-base/stringprintf.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 
 #include <android/hardware/camera2/ICameraDeviceCallbacks.h>
 
@@ -42,7 +44,7 @@
 
 namespace android {
 
-Camera3OfflineSession::Camera3OfflineSession(const String8 &id,
+Camera3OfflineSession::Camera3OfflineSession(const std::string &id,
         const sp<camera3::Camera3Stream>& inputStream,
         const camera3::StreamSet& offlineStreamSet,
         camera3::BufferRecords&& bufferRecords,
@@ -75,15 +77,15 @@
         mRotateAndCropMappers(offlineStates.mRotateAndCropMappers),
         mStatus(STATUS_UNINITIALIZED) {
     ATRACE_CALL();
-    ALOGV("%s: Created offline session for camera %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Created offline session for camera %s", __FUNCTION__, mId.c_str());
 }
 
 Camera3OfflineSession::~Camera3OfflineSession() {
     ATRACE_CALL();
-    ALOGV("%s: Tearing down offline session for camera id %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Tearing down offline session for camera id %s", __FUNCTION__, mId.c_str());
 }
 
-const String8& Camera3OfflineSession::getId() const {
+const std::string& Camera3OfflineSession::getId() const {
     return mId;
 }
 
@@ -109,7 +111,7 @@
             return OK; // don't close twice
         } else if (mStatus == STATUS_ERROR) {
             ALOGE("%s: offline session %s shutting down in error state",
-                    __FUNCTION__, mId.string());
+                    __FUNCTION__, mId.c_str());
         }
         listener = mListener.promote();
     }
@@ -217,8 +219,9 @@
 
 void Camera3OfflineSession::setErrorStateLockedV(const char *fmt, va_list args) {
     // Print out all error messages to log
-    String8 errorCause = String8::formatV(fmt, args);
-    ALOGE("Camera %s: %s", mId.string(), errorCause.string());
+    std::string errorCause;
+    base::StringAppendV(&errorCause, fmt, args);
+    ALOGE("Camera %s: %s", mId.c_str(), errorCause.c_str());
 
     // But only do error state transition steps for the first error
     if (mStatus == STATUS_ERROR || mStatus == STATUS_UNINITIALIZED) return;
diff --git a/services/camera/libcameraservice/device3/Camera3OfflineSession.h b/services/camera/libcameraservice/device3/Camera3OfflineSession.h
index e780043..b5fd486 100644
--- a/services/camera/libcameraservice/device3/Camera3OfflineSession.h
+++ b/services/camera/libcameraservice/device3/Camera3OfflineSession.h
@@ -20,9 +20,6 @@
 #include <memory>
 #include <mutex>
 
-#include <utils/String8.h>
-#include <utils/String16.h>
-
 #include <android/hardware/camera/device/3.6/ICameraOfflineSession.h>
 
 #include <fmq/MessageQueue.h>
@@ -138,7 +135,7 @@
   public:
 
     // initialize by Camera3Device.
-    explicit Camera3OfflineSession(const String8& id,
+    explicit Camera3OfflineSession(const std::string& id,
             const sp<camera3::Camera3Stream>& inputStream,
             const camera3::StreamSet& offlineStreamSet,
             camera3::BufferRecords&& bufferRecords,
@@ -158,7 +155,7 @@
     /**
      * FrameProducer interface
      */
-    const String8& getId() const override;
+    const std::string& getId() const override;
     const CameraMetadata& info() const override;
     status_t waitForNextFrame(nsecs_t timeout) override;
     status_t getNextResult(CaptureResult *frame) override;
@@ -171,7 +168,7 @@
 
   protected:
     // Camera device ID
-    const String8 mId;
+    const std::string mId;
     sp<camera3::Camera3Stream> mInputStream;
     camera3::StreamSet mOutputStreams;
     camera3::BufferRecords mBufferRecords;
@@ -236,7 +233,7 @@
     std::mutex mProcessCaptureResultLock;
 
     // Tracking cause of fatal errors when in STATUS_ERROR
-    String8 mErrorCause;
+    std::string mErrorCause;
 
     // Lock to ensure requestStreamBuffers() callbacks are serialized
     std::mutex mRequestBufferInterfaceLock;
diff --git a/services/camera/libcameraservice/device3/Camera3OutputStream.cpp b/services/camera/libcameraservice/device3/Camera3OutputStream.cpp
index aaf5d8d..f98636b 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputStream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3OutputStream.cpp
@@ -31,6 +31,7 @@
 #include <ui/GraphicBuffer.h>
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 
 #include <common/CameraDeviceBase.h>
 #include "api1/client2/JpegProcessor.h"
@@ -53,7 +54,7 @@
         sp<Surface> consumer,
         uint32_t width, uint32_t height, int format,
         android_dataspace dataSpace, camera_stream_rotation_t rotation,
-        nsecs_t timestampOffset, const String8& physicalCameraId,
+        nsecs_t timestampOffset, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
         int setId, bool isMultiResolution, int64_t dynamicRangeProfile,
         int64_t streamUseCase, bool deviceTimeBaseIsRealtime, int timestampBase,
@@ -88,7 +89,7 @@
         sp<Surface> consumer,
         uint32_t width, uint32_t height, size_t maxSize, int format,
         android_dataspace dataSpace, camera_stream_rotation_t rotation,
-        nsecs_t timestampOffset, const String8& physicalCameraId,
+        nsecs_t timestampOffset, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
         int setId, bool isMultiResolution, int64_t dynamicRangeProfile,
         int64_t streamUseCase, bool deviceTimeBaseIsRealtime, int timestampBase,
@@ -128,7 +129,7 @@
         uint32_t width, uint32_t height, int format,
         uint64_t consumerUsage, android_dataspace dataSpace,
         camera_stream_rotation_t rotation, nsecs_t timestampOffset,
-        const String8& physicalCameraId,
+        const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
         int setId, bool isMultiResolution, int64_t dynamicRangeProfile,
         int64_t streamUseCase, bool deviceTimeBaseIsRealtime, int timestampBase,
@@ -164,7 +165,7 @@
         mState = STATE_ERROR;
     }
 
-    mConsumerName = String8("Deferred");
+    mConsumerName = "Deferred";
     bool needsReleaseNotify = setId > CAMERA3_STREAM_SET_ID_INVALID;
     mBufferProducerListener = new BufferProducerListener(this, needsReleaseNotify);
 }
@@ -174,7 +175,7 @@
                                          int format,
                                          android_dataspace dataSpace,
                                          camera_stream_rotation_t rotation,
-                                         const String8& physicalCameraId,
+                                         const std::string& physicalCameraId,
                                          const std::unordered_set<int32_t> &sensorPixelModesUsed,
                                          IPCTransport transport,
                                          uint64_t consumerUsage, nsecs_t timestampOffset,
@@ -523,10 +524,10 @@
 }
 
 void Camera3OutputStream::dump(int fd, [[maybe_unused]] const Vector<String16> &args) const {
-    String8 lines;
-    lines.appendFormat("    Stream[%d]: Output\n", mId);
-    lines.appendFormat("      Consumer name: %s\n", mConsumerName.string());
-    write(fd, lines.string(), lines.size());
+    std::string lines;
+    lines += fmt::sprintf("    Stream[%d]: Output\n", mId);
+    lines += fmt::sprintf("      Consumer name: %s\n", mConsumerName);
+    write(fd, lines.c_str(), lines.size());
 
     Camera3IOStreamBase::dump(fd, args);
 
@@ -710,7 +711,8 @@
             // service. So update mMaxCachedBufferCount.
             mMaxCachedBufferCount = 1;
             mTotalBufferCount += mMaxCachedBufferCount;
-            res = mPreviewFrameSpacer->run(String8::format("PreviewSpacer-%d", mId).string());
+            res = mPreviewFrameSpacer->run((std::string("PreviewSpacer-")
+                    + std::to_string(mId)).c_str());
             if (res != OK) {
                 ALOGE("%s: Unable to start preview spacer: %s (%d)", __FUNCTION__,
                         strerror(-res), res);
@@ -1234,7 +1236,7 @@
     return OK;
 }
 
-const String8& Camera3OutputStream::getPhysicalCameraId() const {
+const std::string& Camera3OutputStream::getPhysicalCameraId() const {
     Mutex::Autolock l(mLock);
     return physicalCameraId();
 }
@@ -1338,7 +1340,7 @@
     // Output image data to file
     std::string filePath = "/data/misc/cameraserver/";
     filePath += imageFileName;
-    std::ofstream imageFile(filePath.c_str(), std::ofstream::binary);
+    std::ofstream imageFile(filePath, std::ofstream::binary);
     if (!imageFile.is_open()) {
         ALOGE("%s: Unable to create file %s", __FUNCTION__, filePath.c_str());
         graphicBuffer->unlock();
diff --git a/services/camera/libcameraservice/device3/Camera3OutputStream.h b/services/camera/libcameraservice/device3/Camera3OutputStream.h
index ebd5797..65791a9 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputStream.h
@@ -89,7 +89,7 @@
     Camera3OutputStream(int id, sp<Surface> consumer,
             uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation,
-            nsecs_t timestampOffset, const String8& physicalCameraId,
+            nsecs_t timestampOffset, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
             int setId = CAMERA3_STREAM_SET_ID_INVALID, bool isMultiResolution = false,
             int64_t dynamicProfile = ANDROID_REQUEST_AVAILABLE_DYNAMIC_RANGE_PROFILES_MAP_STANDARD,
@@ -108,7 +108,7 @@
     Camera3OutputStream(int id, sp<Surface> consumer,
             uint32_t width, uint32_t height, size_t maxSize, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation,
-            nsecs_t timestampOffset, const String8& physicalCameraId,
+            nsecs_t timestampOffset, const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
             int setId = CAMERA3_STREAM_SET_ID_INVALID, bool isMultiResolution = false,
             int64_t dynamicProfile = ANDROID_REQUEST_AVAILABLE_DYNAMIC_RANGE_PROFILES_MAP_STANDARD,
@@ -126,7 +126,7 @@
     Camera3OutputStream(int id, uint32_t width, uint32_t height, int format,
             uint64_t consumerUsage, android_dataspace dataSpace,
             camera_stream_rotation_t rotation, nsecs_t timestampOffset,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
             int setId = CAMERA3_STREAM_SET_ID_INVALID, bool isMultiResolution = false,
             int64_t dynamicProfile = ANDROID_REQUEST_AVAILABLE_DYNAMIC_RANGE_PROFILES_MAP_STANDARD,
@@ -214,7 +214,7 @@
     /**
      * Query the physical camera id for the output stream.
      */
-    virtual const String8& getPhysicalCameraId() const override;
+    virtual const std::string& getPhysicalCameraId() const override;
 
     /**
      * Set the graphic buffer manager to get/return the stream buffers.
@@ -276,7 +276,7 @@
     Camera3OutputStream(int id, camera_stream_type_t type,
             uint32_t width, uint32_t height, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
             uint64_t consumerUsage = 0, nsecs_t timestampOffset = 0,
             int setId = CAMERA3_STREAM_SET_ID_INVALID, bool isMultiResolution = false,
@@ -327,7 +327,7 @@
     bool mTraceFirstBuffer;
 
     // Name of Surface consumer
-    String8           mConsumerName;
+    std::string           mConsumerName;
 
     /**
      * GraphicBuffer manager this stream is registered to. Used to replace the buffer
diff --git a/services/camera/libcameraservice/device3/Camera3OutputStreamInterface.h b/services/camera/libcameraservice/device3/Camera3OutputStreamInterface.h
index 4baa7e8..1ab8162 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputStreamInterface.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputStreamInterface.h
@@ -94,7 +94,7 @@
     /**
      * Query the physical camera id for the output stream.
      */
-    virtual const String8& getPhysicalCameraId() const = 0;
+    virtual const std::string& getPhysicalCameraId() const = 0;
 
     /**
      * Set the batch size for buffer operations. The output stream will request
diff --git a/services/camera/libcameraservice/device3/Camera3OutputUtils.cpp b/services/camera/libcameraservice/device3/Camera3OutputUtils.cpp
index f742a6d..1e7e337 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputUtils.cpp
+++ b/services/camera/libcameraservice/device3/Camera3OutputUtils.cpp
@@ -43,6 +43,7 @@
 #include <android/hardware/camera/device/3.5/ICameraDeviceSession.h>
 
 #include <camera/CameraUtils.h>
+#include <camera/StringUtils.h>
 #include <camera_metadata_hidden.h>
 
 #include "device3/Camera3OutputUtils.h"
@@ -249,16 +250,16 @@
     // and RotationAndCrop mappers.
     std::set<uint32_t> keysToRemove;
 
-    auto iter = states.distortionMappers.find(states.cameraId.c_str());
+    auto iter = states.distortionMappers.find(states.cameraId);
     if (iter != states.distortionMappers.end()) {
         const auto& remappedKeys = iter->second.getRemappedKeys();
         keysToRemove.insert(remappedKeys.begin(), remappedKeys.end());
     }
 
-    const auto& remappedKeys = states.zoomRatioMappers[states.cameraId.c_str()].getRemappedKeys();
+    const auto& remappedKeys = states.zoomRatioMappers[states.cameraId].getRemappedKeys();
     keysToRemove.insert(remappedKeys.begin(), remappedKeys.end());
 
-    auto mapper = states.rotateAndCropMappers.find(states.cameraId.c_str());
+    auto mapper = states.rotateAndCropMappers.find(states.cameraId);
     if (mapper != states.rotateAndCropMappers.end()) {
         const auto& remappedKeys = iter->second.getRemappedKeys();
         keysToRemove.insert(remappedKeys.begin(), remappedKeys.end());
@@ -342,14 +343,14 @@
                 physicalMetadata.mPhysicalCameraMetadata.find(ANDROID_SENSOR_TIMESTAMP);
         if (timestamp.count == 0) {
             SET_ERR("No timestamp provided by HAL for physical camera %s frame %d!",
-                    String8(physicalMetadata.mPhysicalCameraId).c_str(), frameNumber);
+                    physicalMetadata.mPhysicalCameraId.c_str(), frameNumber);
             return;
         }
     }
 
     // Fix up some result metadata to account for HAL-level distortion correction
     status_t res = OK;
-    auto iter = states.distortionMappers.find(states.cameraId.c_str());
+    auto iter = states.distortionMappers.find(states.cameraId);
     if (iter != states.distortionMappers.end()) {
         res = iter->second.correctCaptureResult(&captureResult.mMetadata);
         if (res != OK) {
@@ -361,8 +362,8 @@
 
     // Fix up result metadata to account for zoom ratio availabilities between
     // HAL and app.
-    bool zoomRatioIs1 = cameraIdsWithZoom.find(states.cameraId.c_str()) == cameraIdsWithZoom.end();
-    res = states.zoomRatioMappers[states.cameraId.c_str()].updateCaptureResult(
+    bool zoomRatioIs1 = cameraIdsWithZoom.find(states.cameraId) == cameraIdsWithZoom.end();
+    res = states.zoomRatioMappers[states.cameraId].updateCaptureResult(
             &captureResult.mMetadata, zoomRatioIs1);
     if (res != OK) {
         SET_ERR("Failed to update capture result zoom ratio metadata for frame %d: %s (%d)",
@@ -372,7 +373,7 @@
 
     // Fix up result metadata to account for rotateAndCrop in AUTO mode
     if (rotateAndCropAuto) {
-        auto mapper = states.rotateAndCropMappers.find(states.cameraId.c_str());
+        auto mapper = states.rotateAndCropMappers.find(states.cameraId);
         if (mapper != states.rotateAndCropMappers.end()) {
             res = mapper->second.updateCaptureResult(
                     &captureResult.mMetadata);
@@ -401,8 +402,8 @@
     }
 
     for (auto& physicalMetadata : captureResult.mPhysicalMetadatas) {
-        String8 cameraId8(physicalMetadata.mPhysicalCameraId);
-        auto mapper = states.distortionMappers.find(cameraId8.c_str());
+        const std::string cameraId = physicalMetadata.mPhysicalCameraId;
+        auto mapper = states.distortionMappers.find(cameraId);
         if (mapper != states.distortionMappers.end()) {
             res = mapper->second.correctCaptureResult(
                     &physicalMetadata.mPhysicalCameraMetadata);
@@ -413,12 +414,12 @@
             }
         }
 
-        zoomRatioIs1 = cameraIdsWithZoom.find(cameraId8.c_str()) == cameraIdsWithZoom.end();
-        res = states.zoomRatioMappers[cameraId8.c_str()].updateCaptureResult(
+        zoomRatioIs1 = cameraIdsWithZoom.find(cameraId) == cameraIdsWithZoom.end();
+        res = states.zoomRatioMappers[cameraId].updateCaptureResult(
                 &physicalMetadata.mPhysicalCameraMetadata, zoomRatioIs1);
         if (res != OK) {
             SET_ERR("Failed to update camera %s's physical zoom ratio metadata for "
-                    "frame %d: %s(%d)", cameraId8.c_str(), frameNumber, strerror(-res), res);
+                    "frame %d: %s(%d)", cameraId.c_str(), frameNumber, strerror(-res), res);
             return;
         }
     }
@@ -430,9 +431,9 @@
         return;
     }
     for (auto& physicalMetadata : captureResult.mPhysicalMetadatas) {
-        String8 cameraId8(physicalMetadata.mPhysicalCameraId);
+        const std::string &cameraId = physicalMetadata.mPhysicalCameraId;
         res = fixupMonochromeTags(states,
-                states.physicalDeviceInfoMap.at(cameraId8.c_str()),
+                states.physicalDeviceInfoMap.at(cameraId),
                 physicalMetadata.mPhysicalCameraMetadata);
         if (res != OK) {
             SET_ERR("Failed to override result metadata: %s (%d)", strerror(-res), res);
@@ -442,7 +443,7 @@
 
     std::unordered_map<std::string, CameraMetadata> monitoredPhysicalMetadata;
     for (auto& m : physicalMetadatas) {
-        monitoredPhysicalMetadata.emplace(String8(m.mPhysicalCameraId).string(),
+        monitoredPhysicalMetadata.emplace(m.mPhysicalCameraId,
                 CameraMetadata(m.mPhysicalCameraMetadata));
     }
     states.tagMonitor.monitorMetadata(TagMonitor::RESULT,
@@ -528,7 +529,7 @@
 
 // Erase the subset of physicalCameraIds that contains id
 bool erasePhysicalCameraIdSet(
-        std::set<std::set<String8>>& physicalCameraIds, const String8& id) {
+        std::set<std::set<std::string>>& physicalCameraIds, const std::string& id) {
     bool found = false;
     for (auto iter = physicalCameraIds.begin(); iter != physicalCameraIds.end(); iter++) {
         if (iter->count(id) == 1) {
@@ -712,7 +713,7 @@
                 return;
             }
             for (uint32_t i = 0; i < result->num_physcam_metadata; i++) {
-                String8 physicalId(result->physcam_ids[i]);
+                const std::string physicalId = result->physcam_ids[i];
                 bool validPhysicalCameraMetadata =
                         erasePhysicalCameraIdSet(request.physicalCameraIds, physicalId);
                 if (!validPhysicalCameraMetadata) {
@@ -768,7 +769,7 @@
             for (uint32_t i = 0; i < result->num_physcam_metadata; i++) {
                 CameraMetadata physicalMetadata;
                 physicalMetadata.append(result->physcam_metadata[i]);
-                request.physicalMetadatas.push_back({String16(result->physcam_ids[i]),
+                request.physicalMetadatas.push_back({result->physcam_ids[i],
                         physicalMetadata});
             }
             if (shutterTimestamp == 0) {
@@ -996,7 +997,7 @@
             }
             if (r.hasCallback) {
                 ALOGVV("Camera %s: %s: Shutter fired for frame %d (id %d) at %" PRId64,
-                    states.cameraId.string(), __FUNCTION__,
+                    states.cameraId.c_str(), __FUNCTION__,
                     msg.frame_number, r.resultExtras.requestId, msg.timestamp);
                 // Call listener, if any
                 if (states.listener != nullptr) {
@@ -1053,15 +1054,15 @@
             hardware::camera2::ICameraDeviceCallbacks::ERROR_CAMERA_INVALID_ERROR;
 
     int streamId = 0;
-    String16 physicalCameraId;
+    std::string physicalCameraId;
     if (msg.error_stream != nullptr) {
         Camera3Stream *stream =
                 Camera3Stream::cast(msg.error_stream);
         streamId = stream->getId();
-        physicalCameraId = String16(stream->physicalCameraId());
+        physicalCameraId = stream->physicalCameraId();
     }
     ALOGV("Camera %s: %s: HAL error, frame %d, stream %d: %d",
-            states.cameraId.string(), __FUNCTION__, msg.frame_number,
+            states.cameraId.c_str(), __FUNCTION__, msg.frame_number,
             streamId, msg.error_code);
 
     CaptureResultExtras resultExtras;
@@ -1083,13 +1084,12 @@
                     if (hardware::camera2::ICameraDeviceCallbacks::ERROR_CAMERA_RESULT ==
                             errorCode) {
                         if (physicalCameraId.size() > 0) {
-                            String8 cameraId(physicalCameraId);
                             bool validPhysicalCameraId =
-                                    erasePhysicalCameraIdSet(r.physicalCameraIds, cameraId);
+                                    erasePhysicalCameraIdSet(r.physicalCameraIds, physicalCameraId);
                             if (!validPhysicalCameraId) {
                                 ALOGE("%s: Reported result failure for physical camera device: %s "
                                         " which is not part of the respective request!",
-                                        __FUNCTION__, cameraId.string());
+                                        __FUNCTION__, physicalCameraId.c_str());
                                 break;
                             }
                             resultExtras.errorPhysicalCameraId = physicalCameraId;
@@ -1114,7 +1114,7 @@
                 } else {
                     resultExtras.frameNumber = msg.frame_number;
                     ALOGE("Camera %s: %s: cannot find in-flight request on "
-                            "frame %" PRId64 " error", states.cameraId.string(), __FUNCTION__,
+                            "frame %" PRId64 " error", states.cameraId.c_str(), __FUNCTION__,
                             resultExtras.frameNumber);
                 }
             }
@@ -1123,7 +1123,7 @@
                 states.listener->notifyError(errorCode, resultExtras);
             } else {
                 ALOGE("Camera %s: %s: no listener available",
-                        states.cameraId.string(), __FUNCTION__);
+                        states.cameraId.c_str(), __FUNCTION__);
             }
             break;
         case hardware::camera2::ICameraDeviceCallbacks::ERROR_CAMERA_BUFFER:
diff --git a/services/camera/libcameraservice/device3/Camera3OutputUtils.h b/services/camera/libcameraservice/device3/Camera3OutputUtils.h
index d5328c5..134c037 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputUtils.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputUtils.h
@@ -71,7 +71,7 @@
     // Camera3Device/Camera3OfflineSession internal states used in notify/processCaptureResult
     // callbacks
     struct CaptureOutputStates {
-        const String8& cameraId;
+        const std::string& cameraId;
         std::mutex& inflightLock;
         int64_t& lastCompletedRegularFrameNumber;
         int64_t& lastCompletedReprocessFrameNumber;
@@ -115,7 +115,7 @@
     void notify(CaptureOutputStates& states, const camera_notify_msg *msg);
 
     struct RequestBufferStates {
-        const String8& cameraId;
+        const std::string& cameraId;
         std::mutex& reqBufferLock; // lock to serialize request buffer calls
         const bool useHalBufManager;
         StreamSet& outputStreams;
@@ -126,7 +126,7 @@
     };
 
     struct ReturnBufferStates {
-        const String8& cameraId;
+        const std::string& cameraId;
         const bool useHalBufManager;
         StreamSet& outputStreams;
         SessionStatsBuilder& sessionStatsBuilder;
@@ -134,7 +134,7 @@
     };
 
     struct FlushInflightReqStates {
-        const String8& cameraId;
+        const std::string& cameraId;
         std::mutex& inflightLock;
         InFlightRequestMap& inflightMap; // end of inflightLock scope
         const bool useHalBufManager;
diff --git a/services/camera/libcameraservice/device3/Camera3OutputUtilsTemplated.h b/services/camera/libcameraservice/device3/Camera3OutputUtilsTemplated.h
index 2e05dda..3ac666b 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputUtilsTemplated.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputUtilsTemplated.h
@@ -296,7 +296,7 @@
         const VecStreamBufferType& buffers) {
     if (!states.useHalBufManager) {
         ALOGE("%s: Camera %s does not support HAL buffer managerment",
-                __FUNCTION__, states.cameraId.string());
+                __FUNCTION__, states.cameraId.c_str());
         return;
     }
 
diff --git a/services/camera/libcameraservice/device3/Camera3SharedOutputStream.cpp b/services/camera/libcameraservice/device3/Camera3SharedOutputStream.cpp
index f3a7359..1191f05 100644
--- a/services/camera/libcameraservice/device3/Camera3SharedOutputStream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3SharedOutputStream.cpp
@@ -31,7 +31,7 @@
         uint32_t width, uint32_t height, int format,
         uint64_t consumerUsage, android_dataspace dataSpace,
         camera_stream_rotation_t rotation,
-        nsecs_t timestampOffset, const String8& physicalCameraId,
+        nsecs_t timestampOffset, const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
         int setId, bool useHalBufManager, int64_t dynamicProfile,
         int64_t streamUseCase, bool deviceTimeBaseIsRealtime, int timestampBase,
diff --git a/services/camera/libcameraservice/device3/Camera3SharedOutputStream.h b/services/camera/libcameraservice/device3/Camera3SharedOutputStream.h
index 1102ecb..c2ff20e 100644
--- a/services/camera/libcameraservice/device3/Camera3SharedOutputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3SharedOutputStream.h
@@ -37,7 +37,7 @@
             uint32_t width, uint32_t height, int format,
             uint64_t consumerUsage, android_dataspace dataSpace,
             camera_stream_rotation_t rotation, nsecs_t timestampOffset,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed, IPCTransport transport,
             int setId = CAMERA3_STREAM_SET_ID_INVALID,
             bool useHalBufManager = false,
diff --git a/services/camera/libcameraservice/device3/Camera3Stream.cpp b/services/camera/libcameraservice/device3/Camera3Stream.cpp
index 4395455..23afa6e 100644
--- a/services/camera/libcameraservice/device3/Camera3Stream.cpp
+++ b/services/camera/libcameraservice/device3/Camera3Stream.cpp
@@ -22,6 +22,7 @@
 
 #include <utils/Log.h>
 #include <utils/Trace.h>
+#include <camera/StringUtils.h>
 #include "device3/Camera3Stream.h"
 #include "device3/StatusTracker.h"
 #include "utils/TraceHFR.h"
@@ -52,7 +53,7 @@
         camera_stream_type type,
         uint32_t width, uint32_t height, size_t maxSize, int format,
         android_dataspace dataSpace, camera_stream_rotation_t rotation,
-        const String8& physicalCameraId,
+        const std::string& physicalCameraId,
         const std::unordered_set<int32_t> &sensorPixelModesUsed,
         int setId, bool isMultiResolution, int64_t dynamicRangeProfile,
         int64_t streamUseCase, bool deviceTimeBaseIsRealtime, int timestampBase,
@@ -60,7 +61,7 @@
     camera_stream(),
     mId(id),
     mSetId(setId),
-    mName(String8::format("Camera3Stream[%d]", id)),
+    mName(fmt::sprintf("Camera3Stream[%d]", id)),
     mMaxSize(maxSize),
     mState(STATE_CONSTRUCTED),
     mStatusId(StatusTracker::NO_STATUS_ID),
@@ -92,7 +93,7 @@
     camera_stream::data_space = dataSpace;
     camera_stream::rotation = rotation;
     camera_stream::max_buffers = 0;
-    camera_stream::physical_camera_id = mPhysicalCameraId.string();
+    camera_stream::physical_camera_id = mPhysicalCameraId;
     camera_stream::sensor_pixel_modes_used = sensorPixelModesUsed;
     camera_stream::dynamic_range_profile = dynamicRangeProfile;
     camera_stream::use_case = streamUseCase;
@@ -177,7 +178,7 @@
     return mOriginalDataSpace;
 }
 
-const String8& Camera3Stream::physicalCameraId() const {
+const std::string& Camera3Stream::physicalCameraId() const {
     return mPhysicalCameraId;
 }
 
@@ -376,7 +377,7 @@
     sp<StatusTracker> statusTracker = mStatusTracker.promote();
     if (statusTracker != 0 && mStatusId == StatusTracker::NO_STATUS_ID) {
         std::string name = std::string("Stream ") + std::to_string(mId);
-        mStatusId = statusTracker->addComponent(name.c_str());
+        mStatusId = statusTracker->addComponent(name);
     }
 
     // Check if the stream configuration is unchanged, and skip reallocation if
diff --git a/services/camera/libcameraservice/device3/Camera3Stream.h b/services/camera/libcameraservice/device3/Camera3Stream.h
index f32053b..2bfaaab 100644
--- a/services/camera/libcameraservice/device3/Camera3Stream.h
+++ b/services/camera/libcameraservice/device3/Camera3Stream.h
@@ -19,7 +19,6 @@
 
 #include <gui/Surface.h>
 #include <utils/RefBase.h>
-#include <utils/String8.h>
 #include <utils/String16.h>
 #include <utils/List.h>
 
@@ -163,25 +162,25 @@
     /**
      * Get the stream's dimensions and format
      */
-    uint32_t          getWidth() const;
-    uint32_t          getHeight() const;
-    int               getFormat() const;
-    android_dataspace getDataSpace() const;
-    int32_t           getColorSpace() const;
-    uint64_t          getUsage() const;
-    void              setUsage(uint64_t usage);
-    void              setFormatOverride(bool formatOverriden);
-    bool              isFormatOverridden() const;
-    int               getOriginalFormat() const;
-    int64_t           getDynamicRangeProfile() const;
-    void              setDataSpaceOverride(bool dataSpaceOverriden);
-    bool              isDataSpaceOverridden() const;
-    android_dataspace getOriginalDataSpace() const;
-    int               getMaxHalBuffers() const;
-    const String8&    physicalCameraId() const;
-    int64_t           getStreamUseCase() const;
-    int               getTimestampBase() const;
-    bool              isDeviceTimeBaseRealtime() const;
+    uint32_t           getWidth() const;
+    uint32_t           getHeight() const;
+    int                getFormat() const;
+    android_dataspace  getDataSpace() const;
+    int32_t            getColorSpace() const;
+    uint64_t           getUsage() const;
+    void               setUsage(uint64_t usage);
+    void               setFormatOverride(bool formatOverridden);
+    bool               isFormatOverridden() const;
+    int                getOriginalFormat() const;
+    int64_t            getDynamicRangeProfile() const;
+    void               setDataSpaceOverride(bool dataSpaceOverridden);
+    bool               isDataSpaceOverridden() const;
+    android_dataspace  getOriginalDataSpace() const;
+    int                getMaxHalBuffers() const;
+    const std::string& physicalCameraId() const;
+    int64_t            getStreamUseCase() const;
+    int                getTimestampBase() const;
+    bool               isDeviceTimeBaseRealtime() const;
 
     void              setOfflineProcessingSupport(bool) override;
     bool              getOfflineProcessingSupport() const override;
@@ -487,7 +486,7 @@
      */
     const int mSetId;
 
-    const String8 mName;
+    const std::string mName;
     // Zero for formats with fixed buffer size for given dimensions.
     const size_t mMaxSize;
 
@@ -507,7 +506,7 @@
     Camera3Stream(int id, camera_stream_type type,
             uint32_t width, uint32_t height, size_t maxSize, int format,
             android_dataspace dataSpace, camera_stream_rotation_t rotation,
-            const String8& physicalCameraId,
+            const std::string& physicalCameraId,
             const std::unordered_set<int32_t> &sensorPixelModesUsed,
             int setId, bool isMultiResolution, int64_t dynamicRangeProfile,
             int64_t streamUseCase, bool deviceTimeBaseIsRealtime, int timestampBase,
@@ -634,7 +633,7 @@
     bool mDataSpaceOverridden;
     const android_dataspace mOriginalDataSpace;
 
-    String8 mPhysicalCameraId;
+    std::string mPhysicalCameraId;
     nsecs_t mLastTimestamp;
 
     bool mIsMultiResolution = false;
diff --git a/services/camera/libcameraservice/device3/Camera3StreamInterface.h b/services/camera/libcameraservice/device3/Camera3StreamInterface.h
index 823be2e..7fa6273 100644
--- a/services/camera/libcameraservice/device3/Camera3StreamInterface.h
+++ b/services/camera/libcameraservice/device3/Camera3StreamInterface.h
@@ -62,7 +62,7 @@
     uint32_t max_buffers;
     android_dataspace_t data_space;
     camera_stream_rotation_t rotation;
-    const char* physical_camera_id;
+    std::string physical_camera_id;
 
     std::unordered_set<int32_t> sensor_pixel_modes_used;
     int64_t dynamic_range_profile;
diff --git a/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp b/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp
index fd23958..8175eb5 100644
--- a/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp
+++ b/services/camera/libcameraservice/device3/Camera3StreamSplitter.cpp
@@ -25,6 +25,7 @@
 #include <gui/IGraphicBufferProducer.h>
 #include <gui/BufferQueue.h>
 #include <gui/Surface.h>
+#include <camera/StringUtils.h>
 
 #include <ui/GraphicBuffer.h>
 
@@ -92,7 +93,7 @@
     if (mBufferItemConsumer == nullptr) {
         return NO_MEMORY;
     }
-    mConsumer->setConsumerName(mConsumerName);
+    mConsumer->setConsumerName(toString8(mConsumerName));
 
     *consumer = new Surface(mProducer);
     if (*consumer == nullptr) {
@@ -408,9 +409,9 @@
     return res;
 }
 
-String8 Camera3StreamSplitter::getUniqueConsumerName() {
+std::string Camera3StreamSplitter::getUniqueConsumerName() {
     static volatile int32_t counter = 0;
-    return String8::format("Camera3StreamSplitter-%d", android_atomic_inc(&counter));
+    return fmt::sprintf("Camera3StreamSplitter-%d", android_atomic_inc(&counter));
 }
 
 status_t Camera3StreamSplitter::notifyBufferReleased(const sp<GraphicBuffer>& buffer) {
diff --git a/services/camera/libcameraservice/device3/Camera3StreamSplitter.h b/services/camera/libcameraservice/device3/Camera3StreamSplitter.h
index 0f728a0..639353c 100644
--- a/services/camera/libcameraservice/device3/Camera3StreamSplitter.h
+++ b/services/camera/libcameraservice/device3/Camera3StreamSplitter.h
@@ -30,10 +30,10 @@
 #include <utils/StrongPointer.h>
 #include <utils/Timers.h>
 
-#define SP_LOGV(x, ...) ALOGV("[%s] " x, mConsumerName.string(), ##__VA_ARGS__)
-#define SP_LOGI(x, ...) ALOGI("[%s] " x, mConsumerName.string(), ##__VA_ARGS__)
-#define SP_LOGW(x, ...) ALOGW("[%s] " x, mConsumerName.string(), ##__VA_ARGS__)
-#define SP_LOGE(x, ...) ALOGE("[%s] " x, mConsumerName.string(), ##__VA_ARGS__)
+#define SP_LOGV(x, ...) ALOGV("[%s] " x, mConsumerName.c_str(), ##__VA_ARGS__)
+#define SP_LOGI(x, ...) ALOGI("[%s] " x, mConsumerName.c_str(), ##__VA_ARGS__)
+#define SP_LOGW(x, ...) ALOGW("[%s] " x, mConsumerName.c_str(), ##__VA_ARGS__)
+#define SP_LOGE(x, ...) ALOGE("[%s] " x, mConsumerName.c_str(), ##__VA_ARGS__)
 
 namespace android {
 
@@ -222,7 +222,7 @@
             const BufferItem& bufferItem, size_t surfaceId);
 
     // Get unique name for the buffer queue consumer
-    String8 getUniqueConsumerName();
+    std::string getUniqueConsumerName();
 
     // Helper function to get the BufferQueue slot where a particular buffer is attached to.
     int getSlotForOutputLocked(const sp<IGraphicBufferProducer>& gbp,
@@ -289,7 +289,7 @@
     // Currently acquired input buffers
     size_t mAcquiredInputBuffers;
 
-    String8 mConsumerName;
+    std::string mConsumerName;
 
     const bool mUseHalBufManager;
 };
diff --git a/services/camera/libcameraservice/device3/InFlightRequest.h b/services/camera/libcameraservice/device3/InFlightRequest.h
index 870825a..665ac73 100644
--- a/services/camera/libcameraservice/device3/InFlightRequest.h
+++ b/services/camera/libcameraservice/device3/InFlightRequest.h
@@ -21,7 +21,6 @@
 
 #include <camera/CaptureResult.h>
 #include <camera/CameraMetadata.h>
-#include <utils/String8.h>
 #include <utils/Timers.h>
 
 #include "common/CameraDeviceBase.h"
@@ -168,7 +167,7 @@
     // For request on a physical camera stream, the inside set contains one Id
     // For request on a stream group containing physical camera streams, the
     // inside set contains all stream Ids in the group.
-    std::set<std::set<String8>> physicalCameraIds;
+    std::set<std::set<std::string>> physicalCameraIds;
 
     // Map of physicalCameraId <-> Metadata
     std::vector<PhysicalCaptureResultInfo> physicalMetadatas;
@@ -224,7 +223,7 @@
 
     InFlightRequest(int numBuffers, CaptureResultExtras extras, bool hasInput,
             bool hasAppCallback, nsecs_t minDuration, nsecs_t maxDuration, bool fixedFps,
-            const std::set<std::set<String8>>& physicalCameraIdSet, bool isStillCapture,
+            const std::set<std::set<std::string>>& physicalCameraIdSet, bool isStillCapture,
             bool isZslCapture, bool rotateAndCropAuto, bool autoframingAuto,
             const std::set<std::string>& idsWithZoom, nsecs_t requestNs,
             const SurfaceMap& outSurfaces = SurfaceMap{}) :
diff --git a/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.cpp b/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.cpp
index aa941b0..af48dd6 100644
--- a/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.cpp
+++ b/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.cpp
@@ -26,10 +26,10 @@
 #endif
 
 // Convenience macro for transient errors
-#define CLOGE(fmt, ...) ALOGE("Camera %s: %s: " fmt, mId.string(), __FUNCTION__, \
+#define CLOGE(fmt, ...) ALOGE("Camera %s: %s: " fmt, mId.c_str(), __FUNCTION__, \
             ##__VA_ARGS__)
 
-#define CLOGW(fmt, ...) ALOGW("Camera %s: %s: " fmt, mId.string(), __FUNCTION__, \
+#define CLOGW(fmt, ...) ALOGW("Camera %s: %s: " fmt, mId.c_str(), __FUNCTION__, \
             ##__VA_ARGS__)
 
 // Convenience macros for transitioning to the error state
@@ -53,6 +53,7 @@
 #include <aidlcommonsupport/NativeHandle.h>
 #include <android/binder_ibinder_platform.h>
 #include <android/hardware/camera2/ICameraDeviceUser.h>
+#include <camera/StringUtils.h>
 
 #include "utils/CameraTraces.h"
 #include "mediautils/SchedulingPolicyService.h"
@@ -164,7 +165,7 @@
 
 AidlCamera3Device::AidlCamera3Device(
         std::shared_ptr<CameraServiceProxyWrapper>& cameraServiceProxyWrapper,
-        const String8& id, bool overrideForPerfClass, bool overrideToPortrait,
+        const std::string& id, bool overrideForPerfClass, bool overrideToPortrait,
         bool legacyClient) :
         Camera3Device(cameraServiceProxyWrapper, id, overrideForPerfClass, overrideToPortrait,
         legacyClient) {
@@ -172,12 +173,12 @@
 }
 
 status_t AidlCamera3Device::initialize(sp<CameraProviderManager> manager,
-        const String8& monitorTags) {
+        const std::string& monitorTags) {
     ATRACE_CALL();
     Mutex::Autolock il(mInterfaceLock);
     Mutex::Autolock l(mLock);
 
-    ALOGV("%s: Initializing AIDL device for camera %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Initializing AIDL device for camera %s", __FUNCTION__, mId.c_str());
     if (mStatus != STATUS_UNINITIALIZED) {
         CLOGE("Already initialized!");
         return INVALID_OPERATION;
@@ -186,7 +187,7 @@
 
     std::shared_ptr<camera::device::ICameraDeviceSession> session;
     ATRACE_BEGIN("CameraHal::openSession");
-    status_t res = manager->openAidlSession(mId.string(), mCallbacks,
+    status_t res = manager->openAidlSession(mId, mCallbacks,
             /*out*/ &session);
     ATRACE_END();
     if (res != OK) {
@@ -197,18 +198,18 @@
       SET_ERR("Session iface returned is null");
       return INVALID_OPERATION;
     }
-    res = manager->getCameraCharacteristics(mId.string(), mOverrideForPerfClass, &mDeviceInfo,
+    res = manager->getCameraCharacteristics(mId, mOverrideForPerfClass, &mDeviceInfo,
             mOverrideToPortrait);
     if (res != OK) {
         SET_ERR_L("Could not retrieve camera characteristics: %s (%d)", strerror(-res), res);
         session->close();
         return res;
     }
-    mSupportNativeZoomRatio = manager->supportNativeZoomRatio(mId.string());
-    mIsCompositeJpegRDisabled = manager->isCompositeJpegRDisabled(mId.string());
+    mSupportNativeZoomRatio = manager->supportNativeZoomRatio(mId);
+    mIsCompositeJpegRDisabled = manager->isCompositeJpegRDisabled(mId);
 
     std::vector<std::string> physicalCameraIds;
-    bool isLogical = manager->isLogicalCamera(mId.string(), &physicalCameraIds);
+    bool isLogical = manager->isLogicalCamera(mId, &physicalCameraIds);
     if (isLogical) {
         for (auto& physicalId : physicalCameraIds) {
             // Do not override characteristics for physical cameras
@@ -299,10 +300,10 @@
     mInterface = new AidlHalInterface(session, queue, mUseHalBufManager, mSupportOfflineProcessing);
 
     std::string providerType;
-    mVendorTagId = manager->getProviderTagIdLocked(mId.string());
+    mVendorTagId = manager->getProviderTagIdLocked(mId);
     mTagMonitor.initialize(mVendorTagId);
-    if (!monitorTags.isEmpty()) {
-        mTagMonitor.parseTagsToMonitor(String8(monitorTags));
+    if (!monitorTags.empty()) {
+        mTagMonitor.parseTagsToMonitor(monitorTags);
     }
 
     for (size_t i = 0; i < capabilities.count; i++) {
@@ -922,7 +923,7 @@
         dst.colorSpace = src->color_space;
 
         dst.bufferSize = bufferSizes[i];
-        if (src->physical_camera_id != nullptr) {
+        if (!src->physical_camera_id.empty()) {
             dst.physicalCameraId = src->physical_camera_id;
         }
         dst.groupId = cam3stream->getHalStreamGroupId();
@@ -1100,7 +1101,7 @@
             mapToAidlDataspace(cam3stream->isDataSpaceOverridden() ?
                     cam3stream->getOriginalDataSpace() : src->data_space);
         dst.bufferSize = bufferSizes[i];
-        if (src->physical_camera_id != nullptr) {
+        if (!src->physical_camera_id.empty()) {
             dst.physicalCameraId = src->physical_camera_id;
         }
         dst.groupId = cam3stream->getHalStreamGroupId();
@@ -1456,7 +1457,7 @@
 }
 
 status_t AidlCamera3Device::AidlCamera3DeviceInjectionMethods::injectionInitialize(
-        const String8& injectedCamId, sp<CameraProviderManager> manager,
+        const std::string& injectedCamId, sp<CameraProviderManager> manager,
         const std::shared_ptr<camera::device::ICameraDeviceCallback>&callback) {
     ATRACE_CALL();
     Mutex::Autolock lock(mInjectionLock);
@@ -1480,7 +1481,7 @@
     mInjectedCamId = injectedCamId;
     std::shared_ptr<camera::device::ICameraInjectionSession> injectionSession;
     ATRACE_BEGIN("Injection CameraHal::openSession");
-    status_t res = manager->openAidlInjectionSession(injectedCamId.string(), callback,
+    status_t res = manager->openAidlInjectionSession(injectedCamId, callback,
                                           /*out*/ &injectionSession);
     ATRACE_END();
     if (res != OK) {
@@ -1579,7 +1580,7 @@
     return OK;
 }
 
-status_t AidlCamera3Device::injectionCameraInitialize(const String8 &injectedCamId,
+status_t AidlCamera3Device::injectionCameraInitialize(const std::string &injectedCamId,
             sp<CameraProviderManager> manager) {
         return (static_cast<AidlCamera3DeviceInjectionMethods *>
                     (mInjectionMethods.get()))->injectionInitialize(injectedCamId, manager,
diff --git a/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.h b/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.h
index 99a308b..e0be367 100644
--- a/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.h
+++ b/services/camera/libcameraservice/device3/aidl/AidlCamera3Device.h
@@ -41,7 +41,7 @@
     friend class AidlCameraDeviceCallbacks;
     explicit AidlCamera3Device(
             std::shared_ptr<CameraServiceProxyWrapper>& cameraServiceProxyWrapper,
-            const String8& id, bool overrideForPerfClass, bool overrideToPortrait,
+            const std::string& id, bool overrideForPerfClass, bool overrideToPortrait,
             bool legacyClient = false);
 
     virtual ~AidlCamera3Device() { }
@@ -71,7 +71,7 @@
     virtual status_t switchToOffline(const std::vector<int32_t>& /*streamsToKeep*/,
             /*out*/ sp<CameraOfflineSessionBase>* /*session*/) override;
 
-    status_t initialize(sp<CameraProviderManager> manager, const String8& monitorTags) override;
+    status_t initialize(sp<CameraProviderManager> manager, const std::string& monitorTags) override;
     class AidlHalInterface : public Camera3Device::HalInterface {
      public:
         AidlHalInterface(std::shared_ptr<
@@ -196,7 +196,7 @@
      public:
         // Initialize the injection camera and generate an hal interface.
         status_t injectionInitialize(
-                const String8& injectedCamId, sp<CameraProviderManager> manager,
+                const std::string& injectedCamId, sp<CameraProviderManager> manager,
                 const std::shared_ptr<
                     aidl::android::hardware::camera::device::ICameraDeviceCallback>&
                     callback);
@@ -257,7 +257,7 @@
     };
 
   private:
-    virtual status_t injectionCameraInitialize(const String8 &injectCamId,
+    virtual status_t injectionCameraInitialize(const std::string &injectCamId,
             sp<CameraProviderManager> manager) override;
 
     virtual sp<RequestThread> createNewRequestThread(wp<Camera3Device> parent,
diff --git a/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.cpp b/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.cpp
index 3c3db97..01c4e88 100644
--- a/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.cpp
+++ b/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.cpp
@@ -31,6 +31,7 @@
 
 #include <android/hardware/camera2/ICameraDeviceCallbacks.h>
 #include <android/binder_ibinder_platform.h>
+#include <camera/StringUtils.h>
 
 #include "device3/aidl/AidlCamera3OfflineSession.h"
 #include "device3/Camera3OutputStream.h"
@@ -47,7 +48,7 @@
 
 AidlCamera3OfflineSession::~AidlCamera3OfflineSession() {
     ATRACE_CALL();
-    ALOGV("%s: Tearing down aidl offline session for camera id %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Tearing down aidl offline session for camera id %s", __FUNCTION__, mId.c_str());
     Camera3OfflineSession::disconnectImpl();
 }
 
@@ -113,7 +114,7 @@
 
     std::string activePhysicalId(""); // Unused
     AidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mOfflineReqsLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mOfflineReqs, mOutputLock, mResultQueue, mResultSignal,
@@ -160,7 +161,7 @@
 
     std::string activePhysicalId(""); // Unused
     AidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mOfflineReqsLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mOfflineReqs, mOutputLock, mResultQueue, mResultSignal,
diff --git a/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.h b/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.h
index b31ffb7..33b638c 100644
--- a/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.h
+++ b/services/camera/libcameraservice/device3/aidl/AidlCamera3OfflineSession.h
@@ -20,7 +20,6 @@
 #include <memory>
 #include <mutex>
 
-#include <utils/String8.h>
 #include <utils/String16.h>
 
 #include "AidlCamera3OutputUtils.h"
@@ -106,7 +105,7 @@
     };
 
     // initialize by Camera3Device.
-    explicit AidlCamera3OfflineSession(const String8& id,
+    explicit AidlCamera3OfflineSession(const std::string& id,
             const sp<camera3::Camera3Stream>& inputStream,
             const camera3::StreamSet& offlineStreamSet,
             camera3::BufferRecords&& bufferRecords,
diff --git a/services/camera/libcameraservice/device3/aidl/AidlCamera3OutputUtils.cpp b/services/camera/libcameraservice/device3/aidl/AidlCamera3OutputUtils.cpp
index b2accc1..74d4230 100644
--- a/services/camera/libcameraservice/device3/aidl/AidlCamera3OutputUtils.cpp
+++ b/services/camera/libcameraservice/device3/aidl/AidlCamera3OutputUtils.cpp
@@ -145,7 +145,7 @@
     outBuffers->clear();
     if (!states.useHalBufManager) {
         ALOGE("%s: Camera %s does not support HAL buffer management",
-                __FUNCTION__, states.cameraId.string());
+                __FUNCTION__, states.cameraId.c_str());
         *status = BufferRequestStatus::FAILED_ILLEGAL_ARGUMENTS;
         return;
     }
diff --git a/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.cpp b/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.cpp
index 0d44dd5..06af5ff 100644
--- a/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.cpp
+++ b/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.cpp
@@ -26,7 +26,7 @@
 #endif
 
 // Convenience macro for transient errors
-#define CLOGE(fmt, ...) ALOGE("Camera %s: %s: " fmt, mId.string(), __FUNCTION__, \
+#define CLOGE(fmt, ...) ALOGE("Camera %s: %s: " fmt, mId.c_str(), __FUNCTION__, \
             ##__VA_ARGS__)
 
 // Convenience macros for transitioning to the error state
@@ -46,6 +46,7 @@
 #include <utils/Trace.h>
 #include <utils/Timers.h>
 #include <cutils/properties.h>
+#include <camera/StringUtils.h>
 
 #include <android/hardware/camera/device/3.7/ICameraInjectionSession.h>
 #include <android/hardware/camera2/ICameraDeviceUser.h>
@@ -140,12 +141,12 @@
 }
 
 status_t HidlCamera3Device::initialize(sp<CameraProviderManager> manager,
-        const String8& monitorTags) {
+        const std::string& monitorTags) {
     ATRACE_CALL();
     Mutex::Autolock il(mInterfaceLock);
     Mutex::Autolock l(mLock);
 
-    ALOGV("%s: Initializing HIDL device for camera %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Initializing HIDL device for camera %s", __FUNCTION__, mId.c_str());
     if (mStatus != STATUS_UNINITIALIZED) {
         CLOGE("Already initialized!");
         return INVALID_OPERATION;
@@ -154,7 +155,7 @@
 
     sp<ICameraDeviceSession> session;
     ATRACE_BEGIN("CameraHal::openSession");
-    status_t res = manager->openHidlSession(mId.string(), this,
+    status_t res = manager->openHidlSession(mId, this,
             /*out*/ &session);
     ATRACE_END();
     if (res != OK) {
@@ -162,17 +163,17 @@
         return res;
     }
 
-    res = manager->getCameraCharacteristics(mId.string(), mOverrideForPerfClass, &mDeviceInfo,
+    res = manager->getCameraCharacteristics(mId, mOverrideForPerfClass, &mDeviceInfo,
             /*overrideToPortrait*/false);
     if (res != OK) {
         SET_ERR_L("Could not retrieve camera characteristics: %s (%d)", strerror(-res), res);
         session->close();
         return res;
     }
-    mSupportNativeZoomRatio = manager->supportNativeZoomRatio(mId.string());
+    mSupportNativeZoomRatio = manager->supportNativeZoomRatio(mId);
 
     std::vector<std::string> physicalCameraIds;
-    bool isLogical = manager->isLogicalCamera(mId.string(), &physicalCameraIds);
+    bool isLogical = manager->isLogicalCamera(mId, &physicalCameraIds);
     if (isLogical) {
         for (auto& physicalId : physicalCameraIds) {
             // Do not override characteristics for physical cameras
@@ -271,17 +272,17 @@
     mInterface = new HidlHalInterface(session, queue, mUseHalBufManager, mSupportOfflineProcessing);
 
     std::string providerType;
-    mVendorTagId = manager->getProviderTagIdLocked(mId.string());
+    mVendorTagId = manager->getProviderTagIdLocked(mId);
     mTagMonitor.initialize(mVendorTagId);
-    if (!monitorTags.isEmpty()) {
-        mTagMonitor.parseTagsToMonitor(String8(monitorTags));
+    if (!monitorTags.empty()) {
+        mTagMonitor.parseTagsToMonitor(monitorTags);
     }
 
     // Metadata tags needs fixup for monochrome camera device version less
     // than 3.5.
     hardware::hidl_version maxVersion{0,0};
     IPCTransport transport = IPCTransport::HIDL;
-    res = manager->getHighestSupportedVersion(mId.string(), &maxVersion, &transport);
+    res = manager->getHighestSupportedVersion(mId, &maxVersion, &transport);
     if (res != OK) {
         ALOGE("%s: Error in getting camera device version id: %s (%d)",
                 __FUNCTION__, strerror(-res), res);
@@ -416,7 +417,7 @@
     }
 
     HidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mInFlightLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mInFlightMap, mOutputLock,  mResultQueue, mResultSignal,
@@ -464,7 +465,7 @@
     }
 
     HidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mInFlightLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mInFlightMap, mOutputLock,  mResultQueue, mResultSignal,
@@ -715,7 +716,7 @@
     return new HidlCamera3DeviceInjectionMethods(parent);
 }
 
-status_t HidlCamera3Device::injectionCameraInitialize(const String8 &injectedCamId,
+status_t HidlCamera3Device::injectionCameraInitialize(const std::string &injectedCamId,
             sp<CameraProviderManager> manager) {
         return (static_cast<HidlCamera3DeviceInjectionMethods *>(
                 mInjectionMethods.get()))->injectionInitialize(injectedCamId, manager, this);
@@ -941,7 +942,7 @@
         }
         dst3_4.v3_2 = dst3_2;
         dst3_4.bufferSize = bufferSizes[i];
-        if (src->physical_camera_id != nullptr) {
+        if (!src->physical_camera_id.empty()) {
             dst3_4.physicalCameraId = src->physical_camera_id;
         }
         dst3_7.v3_4 = dst3_4;
@@ -1259,7 +1260,7 @@
         }
         dst3_4.v3_2 = dst3_2;
         dst3_4.bufferSize = bufferSizes[i];
-        if (src->physical_camera_id != nullptr) {
+        if (!src->physical_camera_id.empty()) {
             dst3_4.physicalCameraId = src->physical_camera_id;
         }
         dst3_7.v3_4 = dst3_4;
@@ -1739,7 +1740,7 @@
 }
 
 status_t HidlCamera3Device::HidlCamera3DeviceInjectionMethods::injectionInitialize(
-        const String8& injectedCamId, sp<CameraProviderManager> manager,
+        const std::string& injectedCamId, sp<CameraProviderManager> manager,
         const sp<android::hardware::camera::device::V3_2::ICameraDeviceCallback>&
                 callback) {
     ATRACE_CALL();
@@ -1759,7 +1760,7 @@
     mInjectedCamId = injectedCamId;
     sp<ICameraDeviceSession> session;
     ATRACE_BEGIN("Injection CameraHal::openSession");
-    status_t res = manager->openHidlSession(injectedCamId.string(), callback,
+    status_t res = manager->openHidlSession(injectedCamId, callback,
                                           /*out*/ &session);
     ATRACE_END();
     if (res != OK) {
diff --git a/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.h b/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.h
index 1e50844..2cfdf9d 100644
--- a/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.h
+++ b/services/camera/libcameraservice/device3/hidl/HidlCamera3Device.h
@@ -31,8 +31,9 @@
             public Camera3Device {
   public:
 
-   explicit HidlCamera3Device(std::shared_ptr<CameraServiceProxyWrapper>& cameraServiceProxyWrapper,
-        const String8& id, bool overrideForPerfClass, bool overrideToPortrait,
+    explicit HidlCamera3Device(
+        std::shared_ptr<CameraServiceProxyWrapper>& cameraServiceProxyWrapper,
+        const std::string& id, bool overrideForPerfClass, bool overrideToPortrait,
         bool legacyClient = false) :
         Camera3Device(cameraServiceProxyWrapper, id, overrideForPerfClass, overrideToPortrait,
                 legacyClient) { }
@@ -59,7 +60,7 @@
     static uint64_t mapProducerToFrameworkUsage(
             hardware::camera::device::V3_2::BufferUsageFlags usage);
 
-    status_t initialize(sp<CameraProviderManager> manager, const String8& monitorTags) override;
+    status_t initialize(sp<CameraProviderManager> manager, const std::string& monitorTags) override;
 
     /**
      * Implementation of android::hardware::camera::device::V3_5::ICameraDeviceCallback
@@ -191,7 +192,7 @@
      public:
         // Initialize the injection camera and generate an hal interface.
         status_t injectionInitialize(
-                const String8& injectedCamId, sp<CameraProviderManager> manager,
+                const std::string& injectedCamId, sp<CameraProviderManager> manager,
                 const sp<
                     android::hardware::camera::device::V3_2 ::ICameraDeviceCallback>&
                     callback);
@@ -217,7 +218,7 @@
     hardware::Return<void> notifyHelper(
             const hardware::hidl_vec<NotifyMsgType>& msgs);
 
-    virtual status_t injectionCameraInitialize(const String8 &injectCamId,
+    virtual status_t injectionCameraInitialize(const std::string &injectCamId,
             sp<CameraProviderManager> manager) override;
 
     virtual sp<RequestThread> createNewRequestThread(wp<Camera3Device> parent,
diff --git a/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.cpp b/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.cpp
index 28b2b47..e328ef6 100644
--- a/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.cpp
+++ b/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.cpp
@@ -23,6 +23,7 @@
 #include <utils/Trace.h>
 
 #include <android/hardware/camera2/ICameraDeviceCallbacks.h>
+#include <camera/StringUtils.h>
 
 #include "device3/hidl/HidlCamera3OfflineSession.h"
 #include "device3/Camera3OutputStream.h"
@@ -38,7 +39,7 @@
 
 HidlCamera3OfflineSession::~HidlCamera3OfflineSession() {
     ATRACE_CALL();
-    ALOGV("%s: Tearing down hidl offline session for camera id %s", __FUNCTION__, mId.string());
+    ALOGV("%s: Tearing down hidl offline session for camera id %s", __FUNCTION__, mId.c_str());
     Camera3OfflineSession::disconnectImpl();
 }
 
@@ -94,7 +95,7 @@
 
     std::string activePhysicalId("");
     HidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mOfflineReqsLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mOfflineReqs, mOutputLock, mResultQueue, mResultSignal,
@@ -136,7 +137,7 @@
 
     std::string activePhysicalId("");
     HidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mOfflineReqsLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mOfflineReqs, mOutputLock, mResultQueue, mResultSignal,
@@ -173,7 +174,7 @@
 
     std::string activePhysicalId("");
     HidlCaptureOutputStates states {
-      {mId,
+      { mId,
         mOfflineReqsLock, mLastCompletedRegularFrameNumber,
         mLastCompletedReprocessFrameNumber, mLastCompletedZslFrameNumber,
         mOfflineReqs, mOutputLock, mResultQueue, mResultSignal,
diff --git a/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.h b/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.h
index d22a447..df306b2 100644
--- a/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.h
+++ b/services/camera/libcameraservice/device3/hidl/HidlCamera3OfflineSession.h
@@ -20,7 +20,6 @@
 #include <memory>
 #include <mutex>
 
-#include <utils/String8.h>
 #include <utils/String16.h>
 
 #include <android/hardware/camera/device/3.6/ICameraOfflineSession.h>
@@ -53,7 +52,7 @@
   public:
 
     // initialize by Camera3Device.
-    explicit HidlCamera3OfflineSession(const String8& id,
+    explicit HidlCamera3OfflineSession(const std::string& id,
             const sp<camera3::Camera3Stream>& inputStream,
             const camera3::StreamSet& offlineStreamSet,
             camera3::BufferRecords&& bufferRecords,
diff --git a/services/camera/libcameraservice/gui/RingBufferConsumer.cpp b/services/camera/libcameraservice/gui/RingBufferConsumer.cpp
index ee018c3..cd4a92c 100644
--- a/services/camera/libcameraservice/gui/RingBufferConsumer.cpp
+++ b/services/camera/libcameraservice/gui/RingBufferConsumer.cpp
@@ -23,6 +23,7 @@
 #include <utils/Log.h>
 
 #include <gui/RingBufferConsumer.h>
+#include <camera/StringUtils.h>
 
 #define BI_LOGV(x, ...) ALOGV("[%s] " x, mName.string(), ##__VA_ARGS__)
 #define BI_LOGD(x, ...) ALOGD("[%s] " x, mName.string(), ##__VA_ARGS__)
@@ -53,10 +54,10 @@
 RingBufferConsumer::~RingBufferConsumer() {
 }
 
-void RingBufferConsumer::setName(const String8& name) {
+void RingBufferConsumer::setName(const std::string& name) {
     Mutex::Autolock _l(mMutex);
-    mName = name;
-    mConsumer->setConsumerName(name);
+    mName = toString8(name);
+    mConsumer->setConsumerName(mName);
 }
 
 sp<PinnedBufferItem> RingBufferConsumer::pinSelectedBuffer(
diff --git a/services/camera/libcameraservice/gui/RingBufferConsumer.h b/services/camera/libcameraservice/gui/RingBufferConsumer.h
index b737469..2e523d1 100644
--- a/services/camera/libcameraservice/gui/RingBufferConsumer.h
+++ b/services/camera/libcameraservice/gui/RingBufferConsumer.h
@@ -27,8 +27,6 @@
 
 namespace android {
 
-class String8;
-
 /**
  * The RingBufferConsumer maintains a ring buffer of BufferItem objects,
  * (which are 'acquired' as long as they are part of the ring buffer, and
@@ -67,7 +65,7 @@
 
     // set the name of the RingBufferConsumer that will be used to identify it in
     // log messages.
-    void setName(const String8& name);
+    void setName(const std::string& name);
 
     // setDefaultBufferSize is used to set the size of buffers returned by
     // requestBuffers when a with and height of zero is requested.
diff --git a/services/camera/libcameraservice/hidl/AidlCameraServiceListener.cpp b/services/camera/libcameraservice/hidl/AidlCameraServiceListener.cpp
index add9121..2b81224 100644
--- a/services/camera/libcameraservice/hidl/AidlCameraServiceListener.cpp
+++ b/services/camera/libcameraservice/hidl/AidlCameraServiceListener.cpp
@@ -16,6 +16,7 @@
 
 #include <hidl/AidlCameraServiceListener.h>
 #include <hidl/Utils.h>
+#include <camera/StringUtils.h>
 
 namespace android {
 namespace frameworks {
@@ -28,11 +29,11 @@
 typedef frameworks::cameraservice::service::V2_1::ICameraServiceListener HCameraServiceListener2_1;
 
 binder::Status H2BCameraServiceListener::onStatusChanged(
-    int32_t status, const ::android::String16& cameraId) {
+    int32_t status, const std::string& cameraId) {
   HCameraDeviceStatus hCameraDeviceStatus = convertToHidlCameraDeviceStatus(status);
   CameraStatusAndId cameraStatusAndId;
   cameraStatusAndId.deviceStatus = hCameraDeviceStatus;
-  cameraStatusAndId.cameraId = String8(cameraId).string();
+  cameraStatusAndId.cameraId = cameraId;
   auto ret = mBase->onStatusChanged(cameraStatusAndId);
   if (!ret.isOk()) {
       ALOGE("%s OnStatusChanged callback failed due to %s",__FUNCTION__,
@@ -42,8 +43,8 @@
 }
 
 binder::Status H2BCameraServiceListener::onPhysicalCameraStatusChanged(
-    int32_t status, const ::android::String16& cameraId,
-    const ::android::String16& physicalCameraId) {
+    int32_t status, const std::string& cameraId,
+    const std::string& physicalCameraId) {
   auto cast2_1 = HCameraServiceListener2_1::castFrom(mBase);
   sp<HCameraServiceListener2_1> interface2_1 = nullptr;
   if (cast2_1.isOk()) {
@@ -52,8 +53,8 @@
       HCameraDeviceStatus hCameraDeviceStatus = convertToHidlCameraDeviceStatus(status);
       V2_1::PhysicalCameraStatusAndId cameraStatusAndId;
       cameraStatusAndId.deviceStatus = hCameraDeviceStatus;
-      cameraStatusAndId.cameraId = String8(cameraId).string();
-      cameraStatusAndId.physicalCameraId = String8(physicalCameraId).string();
+      cameraStatusAndId.cameraId = cameraId;
+      cameraStatusAndId.physicalCameraId = physicalCameraId;
       auto ret = interface2_1->onPhysicalCameraStatusChanged(cameraStatusAndId);
       if (!ret.isOk()) {
         ALOGE("%s OnPhysicalCameraStatusChanged callback failed due to %s",__FUNCTION__,
@@ -65,13 +66,13 @@
 }
 
 ::android::binder::Status H2BCameraServiceListener::onTorchStatusChanged(
-    int32_t, const ::android::String16&) {
+    int32_t, const std::string&) {
   // We don't implement onTorchStatusChanged
   return binder::Status::ok();
 }
 
 ::android::binder::Status H2BCameraServiceListener::onTorchStrengthLevelChanged(
-    const ::android::String16&, int32_t) {
+    const std::string&, int32_t) {
   return binder::Status::ok();
 }
 
diff --git a/services/camera/libcameraservice/hidl/AidlCameraServiceListener.h b/services/camera/libcameraservice/hidl/AidlCameraServiceListener.h
index 7ef413f..91a4c16 100644
--- a/services/camera/libcameraservice/hidl/AidlCameraServiceListener.h
+++ b/services/camera/libcameraservice/hidl/AidlCameraServiceListener.h
@@ -47,25 +47,25 @@
     ~H2BCameraServiceListener() { }
 
     virtual ::android::binder::Status onStatusChanged(int32_t status,
-            const ::android::String16& cameraId) override;
+            const std::string& cameraId) override;
     virtual ::android::binder::Status onPhysicalCameraStatusChanged(int32_t status,
-            const ::android::String16& cameraId,
-            const ::android::String16& physicalCameraId) override;
+            const std::string& cameraId,
+            const std::string& physicalCameraId) override;
 
     virtual ::android::binder::Status onTorchStatusChanged(
-            int32_t status, const ::android::String16& cameraId) override;
+            int32_t status, const std::string& cameraId) override;
     virtual ::android::binder::Status onTorchStrengthLevelChanged(
-            const ::android::String16& cameraId, int32_t newStrengthLevel) override;
+            const std::string& cameraId, int32_t newStrengthLevel) override;
     virtual binder::Status onCameraAccessPrioritiesChanged() {
         // TODO: no implementation yet.
         return binder::Status::ok();
     }
-    virtual binder::Status onCameraOpened(const ::android::String16& /*cameraId*/,
-            const ::android::String16& /*clientPackageId*/) {
+    virtual binder::Status onCameraOpened(const std::string& /*cameraId*/,
+            const std::string& /*clientPackageId*/) {
         // empty implementation
         return binder::Status::ok();
     }
-    virtual binder::Status onCameraClosed(const ::android::String16& /*cameraId*/) {
+    virtual binder::Status onCameraClosed(const std::string& /*cameraId*/) {
         // empty implementation
         return binder::Status::ok();
     }
diff --git a/services/camera/libcameraservice/hidl/HidlCameraDeviceUser.cpp b/services/camera/libcameraservice/hidl/HidlCameraDeviceUser.cpp
index 0f7f127..59fc1cd 100644
--- a/services/camera/libcameraservice/hidl/HidlCameraDeviceUser.cpp
+++ b/services/camera/libcameraservice/hidl/HidlCameraDeviceUser.cpp
@@ -112,7 +112,7 @@
         physicalCameraSettings->emplace_back();
         CaptureRequest::PhysicalCameraSettings &physicalCameraSetting =
             physicalCameraSettings->back();
-        physicalCameraSetting.id = e.id.c_str();
+        physicalCameraSetting.id = e.id;
 
         // Read the settings either from the fmq or straightaway from the
         // request. We don't need any synchronization, since submitRequestList
diff --git a/services/camera/libcameraservice/hidl/HidlCameraService.cpp b/services/camera/libcameraservice/hidl/HidlCameraService.cpp
index d6910fe..4f12933 100644
--- a/services/camera/libcameraservice/hidl/HidlCameraService.cpp
+++ b/services/camera/libcameraservice/hidl/HidlCameraService.cpp
@@ -65,7 +65,7 @@
     android::CameraMetadata cameraMetadata;
     HStatus status = HStatus::NO_ERROR;
     binder::Status serviceRet =
-        mAidlICameraService->getCameraCharacteristics(String16(cameraId.c_str()),
+        mAidlICameraService->getCameraCharacteristics(cameraId,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false,
                 &cameraMetadata);
     HCameraMetadata hidlMetadata;
@@ -116,7 +116,7 @@
     }
     sp<hardware::camera2::ICameraDeviceCallbacks> callbacks = hybridCallbacks;
     binder::Status serviceRet = mAidlICameraService->connectDevice(
-            callbacks, String16(cameraId.c_str()), String16(""), {},
+            callbacks, cameraId, std::string(), {},
             hardware::ICameraService::USE_CALLING_UID, 0/*oomScoreOffset*/,
             /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false,
             /*out*/&deviceRemote);
@@ -242,7 +242,7 @@
             [this](const hardware::CameraStatus& s) {
                 bool supportsHAL3 = false;
                 binder::Status sRet =
-                            mAidlICameraService->supportsCameraApi(String16(s.cameraId),
+                            mAidlICameraService->supportsCameraApi(s.cameraId,
                                     hardware::ICameraService::API_VERSION_2, &supportsHAL3);
                 return !sRet.isOk() || !supportsHAL3;
             }), cameraStatusAndIds->end());
diff --git a/services/camera/libcameraservice/hidl/Utils.cpp b/services/camera/libcameraservice/hidl/Utils.cpp
index 2a24a23..b5dddf7 100644
--- a/services/camera/libcameraservice/hidl/Utils.cpp
+++ b/services/camera/libcameraservice/hidl/Utils.cpp
@@ -18,6 +18,7 @@
 #include <gui/bufferqueue/1.0/H2BGraphicBufferProducer.h>
 #include <cutils/native_handle.h>
 #include <mediautils/AImageReaderUtils.h>
+#include <camera/StringUtils.h>
 
 namespace android {
 namespace hardware {
@@ -89,9 +90,9 @@
     for (auto &handle : windowHandles) {
         iGBPs.push_back(new H2BGraphicBufferProducer(AImageReader_getHGBPFromHandle(handle)));
     }
-    String16 physicalCameraId16(hOutputConfiguration.physicalCameraId.c_str());
     hardware::camera2::params::OutputConfiguration outputConfiguration(
-        iGBPs, convertFromHidl(hOutputConfiguration.rotation), physicalCameraId16,
+        iGBPs, convertFromHidl(hOutputConfiguration.rotation),
+        hOutputConfiguration.physicalCameraId,
         hOutputConfiguration.windowGroupId, OutputConfiguration::SURFACE_TYPE_UNKNOWN, 0, 0,
         (windowHandles.size() > 1));
     return outputConfiguration;
@@ -157,8 +158,8 @@
     hCaptureResultExtras.frameNumber = captureResultExtras.frameNumber;
     hCaptureResultExtras.partialResultCount = captureResultExtras.partialResultCount;
     hCaptureResultExtras.errorStreamId = captureResultExtras.errorStreamId;
-    hCaptureResultExtras.errorPhysicalCameraId = hidl_string(String8(
-            captureResultExtras.errorPhysicalCameraId).string());
+    hCaptureResultExtras.errorPhysicalCameraId = hidl_string(
+            captureResultExtras.errorPhysicalCameraId.c_str());
     return hCaptureResultExtras;
 }
 
@@ -191,7 +192,7 @@
     size_t i = 0;
     for (auto &statusAndId : src) {
         auto &a = (*dst)[i++];
-        a.cameraId = statusAndId.cameraId.c_str();
+        a.cameraId = statusAndId.cameraId;
         a.deviceStatus = convertToHidlCameraDeviceStatus(statusAndId.status);
     }
     return;
@@ -203,12 +204,12 @@
     size_t i = 0;
     for (const auto &statusAndId : src) {
         auto &a = (*dst)[i++];
-        a.v2_0.cameraId = statusAndId.cameraId.c_str();
+        a.v2_0.cameraId = statusAndId.cameraId;
         a.v2_0.deviceStatus = convertToHidlCameraDeviceStatus(statusAndId.status);
         size_t numUnvailPhysicalCameras = statusAndId.unavailablePhysicalIds.size();
         a.unavailPhysicalCameraIds.resize(numUnvailPhysicalCameras);
         for (size_t j = 0; j < numUnvailPhysicalCameras; j++) {
-            a.unavailPhysicalCameraIds[j] = statusAndId.unavailablePhysicalIds[j].c_str();
+            a.unavailPhysicalCameraIds[j] = statusAndId.unavailablePhysicalIds[j];
         }
     }
     return;
@@ -265,7 +266,7 @@
     std::shared_ptr<CaptureResultMetadataQueue> &captureResultMetadataQueue) {
     HPhysicalCaptureResultInfo hPhysicalCaptureResultInfo;
     hPhysicalCaptureResultInfo.physicalCameraId =
-        String8(physicalCaptureResultInfo.mPhysicalCameraId).string();
+        toString8(physicalCaptureResultInfo.mPhysicalCameraId);
     const camera_metadata_t *rawMetadata =
         physicalCaptureResultInfo.mPhysicalCameraMetadata.getAndLock();
     // Try using fmq at first.
diff --git a/services/camera/libcameraservice/libcameraservice_fuzzer/camera_service_fuzzer.cpp b/services/camera/libcameraservice/libcameraservice_fuzzer/camera_service_fuzzer.cpp
index b397573..854c342 100644
--- a/services/camera/libcameraservice/libcameraservice_fuzzer/camera_service_fuzzer.cpp
+++ b/services/camera/libcameraservice/libcameraservice_fuzzer/camera_service_fuzzer.cpp
@@ -219,13 +219,13 @@
 }
 
 void CameraFuzzer::getCameraInformation(int32_t cameraId) {
-    String16 cameraIdStr = String16(String8::format("%d", cameraId));
+    std::string cameraIdStr = std::to_string(cameraId);
     bool isSupported = false;
     mCameraService->supportsCameraApi(
         cameraIdStr, kCameraApiVersion[mFuzzedDataProvider->ConsumeBool()], &isSupported);
     mCameraService->isHiddenPhysicalCamera(cameraIdStr, &isSupported);
 
-    String16 parameters;
+    std::string parameters;
     mCameraService->getLegacyParameters(cameraId, &parameters);
 
     std::vector<hardware::camera2::utils::ConcurrentCameraIdCombination> concurrentCameraIds;
@@ -318,7 +318,7 @@
 }
 
 void CameraFuzzer::invokeTorchAPIs(int32_t cameraId) {
-    String16 cameraIdStr = String16(String8::format("%d", cameraId));
+    std::string cameraIdStr = std::to_string(cameraId);
     sp<IBinder> binder = new BBinder;
 
     mCameraService->setTorchMode(cameraIdStr, true, binder);
@@ -342,7 +342,7 @@
     ::android::binder::Status rc;
     sp<ICamera> cameraDevice;
 
-    rc = mCameraService->connect(this, cameraId, String16(),
+    rc = mCameraService->connect(this, cameraId, std::string(),
                                  android::CameraService::USE_CALLING_UID,
                                  android::CameraService::USE_CALLING_PID,
                                  /*targetSdkVersion*/ __ANDROID_API_FUTURE__,
@@ -484,17 +484,18 @@
 public:
     virtual ~TestCameraServiceListener() {};
 
-    virtual binder::Status onStatusChanged(int32_t , const String16&) {
+    virtual binder::Status onStatusChanged(int32_t, const std::string&) {
         return binder::Status::ok();
     };
 
     virtual binder::Status onPhysicalCameraStatusChanged(int32_t /*status*/,
-            const String16& /*cameraId*/, const String16& /*physicalCameraId*/) {
+            const std::string& /*cameraId*/, const std::string& /*physicalCameraId*/) {
         // No op
         return binder::Status::ok();
     };
 
-    virtual binder::Status onTorchStatusChanged(int32_t /*status*/, const String16& /*cameraId*/) {
+    virtual binder::Status onTorchStatusChanged(int32_t /*status*/,
+            const std::string& /*cameraId*/) {
         return binder::Status::ok();
     };
 
@@ -503,18 +504,18 @@
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraOpened(const String16& /*cameraId*/,
-            const String16& /*clientPackageName*/) {
+    virtual binder::Status onCameraOpened(const std::string& /*cameraId*/,
+            const std::string& /*clientPackageName*/) {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraClosed(const String16& /*cameraId*/) {
+    virtual binder::Status onCameraClosed(const std::string& /*cameraId*/) {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onTorchStrengthLevelChanged(const String16& /*cameraId*/,
+    virtual binder::Status onTorchStrengthLevelChanged(const std::string& /*cameraId*/,
             int32_t /*torchStrength*/) {
         // No op
         return binder::Status::ok();
@@ -579,7 +580,7 @@
     for (auto s : statuses) {
         sp<TestCameraDeviceCallbacks> callbacks(new TestCameraDeviceCallbacks());
         sp<hardware::camera2::ICameraDeviceUser> device;
-        mCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+        mCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 0/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/true,
                 &device);
@@ -600,7 +601,7 @@
 
         sp<Surface> surface(new Surface(gbProducer, /*controlledByApp*/false));
 
-        String16 noPhysicalId;
+        std::string noPhysicalId;
         size_t rotations = sizeof(kRotations) / sizeof(int32_t) - 1;
         OutputConfiguration output(gbProducer,
                 kRotations[mFuzzedDataProvider->ConsumeIntegralInRange<size_t>(0, rotations)],
@@ -626,9 +627,9 @@
                     kSensorPixelModes[mFuzzedDataProvider->ConsumeBool() ? 1 : 0];
             requestTemplate.update(ANDROID_SENSOR_PIXEL_MODE, &sensorPixelMode, 1);
             request.mPhysicalCameraSettings.clear();
-            request.mPhysicalCameraSettings.push_back({s.cameraId.string(), requestTemplate});
+            request.mPhysicalCameraSettings.push_back({s.cameraId, requestTemplate});
             device->submitRequest(request, /*streaming*/false, /*out*/&info);
-            ALOGV("%s : camera id %s submit request id %d",__FUNCTION__, s.cameraId.string(),
+            ALOGV("%s : camera id %s submit request id %d",__FUNCTION__, s.cameraId.c_str(),
                     info.mRequestId);
         }
         device->disconnect();
diff --git a/services/camera/libcameraservice/tests/CameraPermissionsTest.cpp b/services/camera/libcameraservice/tests/CameraPermissionsTest.cpp
index 731eebf..db43a02 100644
--- a/services/camera/libcameraservice/tests/CameraPermissionsTest.cpp
+++ b/services/camera/libcameraservice/tests/CameraPermissionsTest.cpp
@@ -37,17 +37,18 @@
 public:
     virtual ~TestCameraServiceListener() {};
 
-    virtual binder::Status onStatusChanged(int32_t , const String16&) {
+    virtual binder::Status onStatusChanged(int32_t , const std::string&) {
         return binder::Status::ok();
     };
 
     virtual binder::Status onPhysicalCameraStatusChanged(int32_t /*status*/,
-            const String16& /*cameraId*/, const String16& /*physicalCameraId*/) {
+            const std::string& /*cameraId*/, const std::string& /*physicalCameraId*/) {
         // No op
         return binder::Status::ok();
     };
 
-    virtual binder::Status onTorchStatusChanged(int32_t /*status*/, const String16& /*cameraId*/) {
+    virtual binder::Status onTorchStatusChanged(int32_t /*status*/,
+            const std::string& /*cameraId*/) {
         return binder::Status::ok();
     };
 
@@ -56,18 +57,18 @@
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraOpened(const String16& /*cameraId*/,
-            const String16& /*clientPackageName*/) {
+    virtual binder::Status onCameraOpened(const std::string& /*cameraId*/,
+            const std::string& /*clientPackageName*/) {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onCameraClosed(const String16& /*cameraId*/) {
+    virtual binder::Status onCameraClosed(const std::string& /*cameraId*/) {
         // No op
         return binder::Status::ok();
     }
 
-    virtual binder::Status onTorchStrengthLevelChanged(const String16& /*cameraId*/,
+    virtual binder::Status onTorchStrengthLevelChanged(const std::string& /*cameraId*/,
             int32_t /*torchStrength*/) {
         // No op
         return binder::Status::ok();
@@ -123,13 +124,13 @@
             mCameraDisabled(false), mOverrideCameraDisabled(false)
     { }
 
-    virtual binder::Status getRotateAndCropOverride(const String16& packageName, int lensFacing,
+    virtual binder::Status getRotateAndCropOverride(const std::string& packageName, int lensFacing,
             int userId, int *ret) override {
         return mCameraServiceProxy->getRotateAndCropOverride(packageName, lensFacing,
                 userId, ret);
     }
 
-    virtual binder::Status getAutoframingOverride(const String16& packageName, int *ret) override {
+    virtual binder::Status getAutoframingOverride(const std::string& packageName, int *ret) override {
         return mCameraServiceProxy->getAutoframingOverride(packageName, ret);
     }
 
@@ -224,7 +225,7 @@
         sp<TestCameraDeviceCallbacks> callbacks = new TestCameraDeviceCallbacks();
         sp<hardware::camera2::ICameraDeviceUser> device;
         binder::Status status =
-                sCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+                sCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 0/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false, &device);
         AutoDisconnectDevice autoDisconnect(device);
@@ -238,7 +239,7 @@
         sp<TestCameraDeviceCallbacks> callbacks = new TestCameraDeviceCallbacks();
         sp<hardware::camera2::ICameraDeviceUser> device;
         binder::Status status =
-                sCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+                sCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 0/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false, &device);
         AutoDisconnectDevice autoDisconnect(device);
@@ -257,14 +258,14 @@
         sp<TestCameraDeviceCallbacks> callbacks = new TestCameraDeviceCallbacks();
         sp<hardware::camera2::ICameraDeviceUser> deviceA, deviceB;
         binder::Status status =
-                sCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+                sCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 0/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false, &deviceA);
         AutoDisconnectDevice autoDisconnectA(deviceA);
         ASSERT_TRUE(status.isOk()) << "Exception code " << status.exceptionCode() <<
                 " service specific error code " << status.serviceSpecificErrorCode();
         status =
-                sCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+                sCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 0/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false, &deviceB);
         AutoDisconnectDevice autoDisconnectB(deviceB);
@@ -285,14 +286,14 @@
         sp<TestCameraDeviceCallbacks> callbacks = new TestCameraDeviceCallbacks();
         sp<hardware::camera2::ICameraDeviceUser> deviceA, deviceB;
         binder::Status status =
-                sCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+                sCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 0/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false, &deviceA);
         AutoDisconnectDevice autoDisconnectA(deviceA);
         ASSERT_TRUE(status.isOk()) << "Exception code " << status.exceptionCode() <<
                 " service specific error code " << status.serviceSpecificErrorCode();
         status =
-                sCameraService->connectDevice(callbacks, String16(s.cameraId), String16(), {},
+                sCameraService->connectDevice(callbacks, s.cameraId, std::string(), {},
                 android::CameraService::USE_CALLING_UID, 1/*oomScoreDiff*/,
                 /*targetSdkVersion*/__ANDROID_API_FUTURE__, /*overrideToPortrait*/false, &deviceB);
         AutoDisconnectDevice autoDisconnectB(deviceB);
diff --git a/services/camera/libcameraservice/tests/CameraProviderManagerTest.cpp b/services/camera/libcameraservice/tests/CameraProviderManagerTest.cpp
index 1a6b2e0..c0cd1a9 100644
--- a/services/camera/libcameraservice/tests/CameraProviderManagerTest.cpp
+++ b/services/camera/libcameraservice/tests/CameraProviderManagerTest.cpp
@@ -302,15 +302,15 @@
 
     ~TestStatusListener() {}
 
-    void onDeviceStatusChanged(const String8 &,
+    void onDeviceStatusChanged(const std::string &,
             CameraDeviceStatus) override {}
-    void onDeviceStatusChanged(const String8 &, const String8 &,
+    void onDeviceStatusChanged(const std::string &, const std::string &,
             CameraDeviceStatus) override {
         mPhysicalCameraStatusChangeCount++;
     }
-    void onTorchStatusChanged(const String8 &,
+    void onTorchStatusChanged(const std::string &,
             TorchModeStatus) override {}
-    void onTorchStatusChanged(const String8 &,
+    void onTorchStatusChanged(const std::string &,
             TorchModeStatus, SystemCameraKind) override {}
     void onNewProviderRegistered() override {}
 };
diff --git a/services/camera/libcameraservice/tests/DistortionMapperTest.cpp b/services/camera/libcameraservice/tests/DistortionMapperTest.cpp
index b367571..33cc61a 100644
--- a/services/camera/libcameraservice/tests/DistortionMapperTest.cpp
+++ b/services/camera/libcameraservice/tests/DistortionMapperTest.cpp
@@ -19,8 +19,8 @@
 
 #include <random>
 
+#include <fmt/printf.h>
 #include <gtest/gtest.h>
-#include <android-base/stringprintf.h>
 #include <android-base/chrono_utils.h>
 
 #include "../device3/DistortionMapper.h"
@@ -260,9 +260,9 @@
                 rawToCorrectedDurationMs) / (randCoords.size() / 2) ).count();
 
     test->RecordProperty("CorrectedToRawDurationPerCoordUs",
-            base::StringPrintf("%f", correctedToRawDurationPerCoordUs));
+            fmt::sprintf("%f", correctedToRawDurationPerCoordUs));
     test->RecordProperty("RawToCorrectedDurationPerCoordUs",
-            base::StringPrintf("%f", rawToCorrectedDurationPerCoordUs));
+            fmt::sprintf("%f", rawToCorrectedDurationPerCoordUs));
 
     // Calculate mapping errors after round trip
     float totalErrorSq = 0;
@@ -296,9 +296,9 @@
     }
 
     float rmsError = std::sqrt(totalErrorSq / randCoords.size());
-    test->RecordProperty("RmsError", base::StringPrintf("%f", rmsError));
+    test->RecordProperty("RmsError", fmt::sprintf("%f", rmsError));
     for (size_t i = 0; i < histogram.size(); i++) {
-        std::string label = base::StringPrintf("HistogramBin[%f,%f)",
+        std::string label = fmt::sprintf("HistogramBin[%f,%f)",
                 (float)i/bucketsPerPixel, (float)(i + 1)/bucketsPerPixel);
         test->RecordProperty(label, histogram[i]);
     }
diff --git a/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.cpp b/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.cpp
index b58975f..d07bf6d 100644
--- a/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.cpp
+++ b/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.cpp
@@ -20,6 +20,8 @@
 
 #include <inttypes.h>
 #include <utils/Log.h>
+#include <utils/String16.h>
+#include <camera/StringUtils.h>
 #include <binder/IServiceManager.h>
 
 #include "CameraServiceProxyWrapper.h"
@@ -32,7 +34,7 @@
 
 namespace {
 // Sentinel value to be returned when extension session with a stale or invalid key is reported.
-const String16 POISON_EXT_STATS_KEY("poisoned_stats");
+const std::string POISON_EXT_STATS_KEY("poisoned_stats");
 } // anonymous namespace
 
 /**
@@ -100,7 +102,7 @@
     mSessionStats.mRequestCount = requestCount;
     mSessionStats.mResultErrorCount = resultErrorCount;
     mSessionStats.mDeviceError = deviceError;
-    mSessionStats.mUserTag = String16(userTag.c_str());
+    mSessionStats.mUserTag = userTag;
     mSessionStats.mVideoStabilizationMode = videoStabilizationMode;
     mSessionStats.mStreamStats = streamStats;
 
@@ -116,14 +118,14 @@
     return mSessionStats.mLogId;
 }
 
-String16 CameraServiceProxyWrapper::CameraSessionStatsWrapper::updateExtensionSessionStats(
+std::string CameraServiceProxyWrapper::CameraSessionStatsWrapper::updateExtensionSessionStats(
         const hardware::CameraExtensionSessionStats& extStats) {
     Mutex::Autolock l(mLock);
     CameraExtensionSessionStats& currStats = mSessionStats.mCameraExtensionSessionStats;
     if (currStats.key != extStats.key) {
         // Mismatched keys. Extensions stats likely reported for a closed session
         ALOGW("%s: mismatched extensions stats key: current='%s' reported='%s'. Dropping stats.",
-              __FUNCTION__, String8(currStats.key).c_str(), String8(extStats.key).c_str());
+              __FUNCTION__, toStdString(currStats.key).c_str(), toStdString(extStats.key).c_str());
         return POISON_EXT_STATS_KEY; // return poisoned key to so future calls are
                                      // definitely dropped.
     }
@@ -134,15 +136,15 @@
         ALOGV("%s: Overwriting extension session stats: %s", __FUNCTION__,
               extStats.toString().c_str());
         currStats = extStats;
-        return currStats.key;
+        return toStdString(currStats.key);
     }
 
     // Matching empty keys...
-    if (mSessionStats.mClientName != extStats.clientName) {
+    if (mSessionStats.mClientName != toStdString(extStats.clientName)) {
         ALOGW("%s: extension stats reported for unexpected package: current='%s' reported='%s'. "
               "Dropping stats.", __FUNCTION__,
-              String8(mSessionStats.mClientName).c_str(),
-              String8(extStats.clientName).c_str());
+              mSessionStats.mClientName.c_str(),
+              toStdString(extStats.clientName).c_str());
         return POISON_EXT_STATS_KEY;
     }
 
@@ -166,12 +168,12 @@
         key << mSessionStats.mSessionIndex << '/' << mSessionStats.mLogId;
         currStats.key = String16(key.str().c_str());
         ALOGV("%s: New extension session stats: %s", __FUNCTION__, currStats.toString().c_str());
-        return currStats.key;
+        return toStdString(currStats.key);
     }
 
     // Camera is closed. Probably a stale call.
     ALOGW("%s: extension stats reported for closed camera id '%s'. Dropping stats.",
-          __FUNCTION__, String8(mSessionStats.mCameraId).c_str());
+          __FUNCTION__, mSessionStats.mCameraId.c_str());
     return {};
 }
 
@@ -209,12 +211,13 @@
     proxyBinder->pingForUserUpdate();
 }
 
-int CameraServiceProxyWrapper::getRotateAndCropOverride(String16 packageName, int lensFacing,
-        int userId) {
+int CameraServiceProxyWrapper::getRotateAndCropOverride(const std::string &packageName,
+        int lensFacing, int userId) {
     sp<ICameraServiceProxy> proxyBinder = getCameraServiceProxy();
     if (proxyBinder == nullptr) return true;
     int ret = 0;
-    auto status = proxyBinder->getRotateAndCropOverride(packageName, lensFacing, userId, &ret);
+    auto status = proxyBinder->getRotateAndCropOverride(packageName, lensFacing,
+            userId, &ret);
     if (!status.isOk()) {
         ALOGE("%s: Failed during top activity orientation query: %s", __FUNCTION__,
                 status.exceptionMessage().c_str());
@@ -223,7 +226,7 @@
     return ret;
 }
 
-int CameraServiceProxyWrapper::getAutoframingOverride(const String16& packageName) {
+int CameraServiceProxyWrapper::getAutoframingOverride(const std::string& packageName) {
     sp<ICameraServiceProxy> proxyBinder = getCameraServiceProxy();
     if (proxyBinder == nullptr) {
         return ANDROID_CONTROL_AUTOFRAMING_OFF;
@@ -238,7 +241,7 @@
     return ret;
 }
 
-void CameraServiceProxyWrapper::logStreamConfigured(const String8& id,
+void CameraServiceProxyWrapper::logStreamConfigured(const std::string& id,
         int operatingMode, bool internalConfig, int32_t latencyMs) {
     std::shared_ptr<CameraSessionStatsWrapper> sessionStats;
     {
@@ -256,7 +259,7 @@
     sessionStats->onStreamConfigured(operatingMode, internalConfig, latencyMs);
 }
 
-void CameraServiceProxyWrapper::logActive(const String8& id, float maxPreviewFps) {
+void CameraServiceProxyWrapper::logActive(const std::string& id, float maxPreviewFps) {
     std::shared_ptr<CameraSessionStatsWrapper> sessionStats;
     {
         Mutex::Autolock l(mLock);
@@ -273,7 +276,7 @@
     sessionStats->onActive(proxyBinder, maxPreviewFps);
 }
 
-void CameraServiceProxyWrapper::logIdle(const String8& id,
+void CameraServiceProxyWrapper::logIdle(const std::string& id,
         int64_t requestCount, int64_t resultErrorCount, bool deviceError,
         const std::string& userTag, int32_t videoStabilizationMode,
         const std::vector<hardware::CameraStreamStats>& streamStats) {
@@ -304,8 +307,8 @@
             videoStabilizationMode, streamStats);
 }
 
-void CameraServiceProxyWrapper::logOpen(const String8& id, int facing,
-            const String16& clientPackageName, int effectiveApiLevel, bool isNdk,
+void CameraServiceProxyWrapper::logOpen(const std::string& id, int facing,
+            const std::string& clientPackageName, int effectiveApiLevel, bool isNdk,
             int32_t latencyMs) {
     std::shared_ptr<CameraSessionStatsWrapper> sessionStats;
     {
@@ -325,7 +328,7 @@
         int64_t logId = generateLogId(mRandomDevice);
 
         sessionStats = std::make_shared<CameraSessionStatsWrapper>(
-                String16(id), facing, CameraSessionStats::CAMERA_STATE_OPEN, clientPackageName,
+                id, facing, CameraSessionStats::CAMERA_STATE_OPEN, clientPackageName,
                 apiLevel, isNdk, latencyMs, logId);
         mSessionStatsMap.emplace(id, sessionStats);
         ALOGV("%s: Adding id %s", __FUNCTION__, id.c_str());
@@ -337,7 +340,8 @@
     sessionStats->onOpen(proxyBinder);
 }
 
-void CameraServiceProxyWrapper::logClose(const String8& id, int32_t latencyMs, bool deviceError) {
+void CameraServiceProxyWrapper::logClose(const std::string& id, int32_t latencyMs,
+        bool deviceError) {
     std::shared_ptr<CameraSessionStatsWrapper> sessionStats;
     {
         Mutex::Autolock l(mLock);
@@ -376,7 +380,7 @@
     return ret;
 }
 
-int64_t CameraServiceProxyWrapper::getCurrentLogIdForCamera(const String8& cameraId) {
+int64_t CameraServiceProxyWrapper::getCurrentLogIdForCamera(const std::string& cameraId) {
     std::shared_ptr<CameraSessionStatsWrapper> stats;
     {
         Mutex::Autolock _l(mLock);
@@ -403,10 +407,10 @@
     return ret;
 }
 
-String16 CameraServiceProxyWrapper::updateExtensionStats(
+std::string CameraServiceProxyWrapper::updateExtensionStats(
         const hardware::CameraExtensionSessionStats& extStats) {
     std::shared_ptr<CameraSessionStatsWrapper> stats;
-    String8 cameraId = String8(extStats.cameraId);
+    std::string cameraId = toStdString(extStats.cameraId);
     {
         Mutex::Autolock _l(mLock);
         if (mSessionStatsMap.count(cameraId) == 0) {
diff --git a/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.h b/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.h
index e32580c..1afe5b3 100644
--- a/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.h
+++ b/services/camera/libcameraservice/utils/CameraServiceProxyWrapper.h
@@ -20,11 +20,10 @@
 #include <android/hardware/ICameraServiceProxy.h>
 
 #include <utils/Mutex.h>
-#include <utils/String8.h>
-#include <utils/String16.h>
 #include <utils/StrongPointer.h>
 #include <utils/Timers.h>
 #include <random>
+#include <string>
 
 #include <camera/CameraSessionStats.h>
 
@@ -49,8 +48,8 @@
         void updateProxyDeviceState(sp<hardware::ICameraServiceProxy>& proxyBinder);
 
       public:
-        CameraSessionStatsWrapper(const String16& cameraId, int facing, int newCameraState,
-                                  const String16& clientName, int apiLevel, bool isNdk,
+        CameraSessionStatsWrapper(const std::string& cameraId, int facing, int newCameraState,
+                                  const std::string& clientName, int apiLevel, bool isNdk,
                                   int32_t latencyMs, int64_t logId)
             : mSessionStats(cameraId, facing, newCameraState, clientName, apiLevel, isNdk,
                             latencyMs, logId) {}
@@ -65,7 +64,8 @@
                 const std::string& userTag, int32_t videoStabilizationMode,
                 const std::vector<hardware::CameraStreamStats>& streamStats);
 
-        String16 updateExtensionSessionStats(const hardware::CameraExtensionSessionStats& extStats);
+        std::string updateExtensionSessionStats(
+                const hardware::CameraExtensionSessionStats& extStats);
 
         // Returns the logId associated with this event.
         int64_t getLogId();
@@ -74,7 +74,7 @@
     // Lock for camera session stats map
     Mutex mLock;
     // Map from camera id to the camera's session statistics
-    std::map<String8, std::shared_ptr<CameraSessionStatsWrapper>> mSessionStatsMap;
+    std::map<std::string, std::shared_ptr<CameraSessionStatsWrapper>> mSessionStatsMap;
 
     std::random_device mRandomDevice;  // pulls 32-bit random numbers from /dev/urandom
 
@@ -93,22 +93,22 @@
     static sp<hardware::ICameraServiceProxy> getDefaultCameraServiceProxy();
 
     // Open
-    void logOpen(const String8& id, int facing,
-            const String16& clientPackageName, int apiLevel, bool isNdk,
+    void logOpen(const std::string& id, int facing,
+            const std::string& clientPackageName, int apiLevel, bool isNdk,
             int32_t latencyMs);
 
     // Close
-    void logClose(const String8& id, int32_t latencyMs, bool deviceError);
+    void logClose(const std::string& id, int32_t latencyMs, bool deviceError);
 
     // Stream configuration
-    void logStreamConfigured(const String8& id, int operatingMode, bool internalReconfig,
+    void logStreamConfigured(const std::string& id, int operatingMode, bool internalReconfig,
             int32_t latencyMs);
 
     // Session state becomes active
-    void logActive(const String8& id, float maxPreviewFps);
+    void logActive(const std::string& id, float maxPreviewFps);
 
     // Session state becomes idle
-    void logIdle(const String8& id,
+    void logIdle(const std::string& id,
             int64_t requestCount, int64_t resultErrorCount, bool deviceError,
             const std::string& userTag, int32_t videoStabilizationMode,
             const std::vector<hardware::CameraStreamStats>& streamStats);
@@ -117,10 +117,10 @@
     void pingCameraServiceProxy();
 
     // Return the current top activity rotate and crop override.
-    int getRotateAndCropOverride(String16 packageName, int lensFacing, int userId);
+    int getRotateAndCropOverride(const std::string &packageName, int lensFacing, int userId);
 
     // Return the current top activity autoframing.
-    int getAutoframingOverride(const String16& packageName);
+    int getAutoframingOverride(const std::string& packageName);
 
     // Detect if the camera is disabled by device policy.
     bool isCameraDisabled(int userId);
@@ -128,10 +128,10 @@
     // Returns the logId currently associated with the given cameraId. See 'mLogId' in
     // frameworks/av/camera/include/camera/CameraSessionStats.h for more details about this
     // identifier. Returns a non-0 value on success.
-    int64_t getCurrentLogIdForCamera(const String8& cameraId);
+    int64_t getCurrentLogIdForCamera(const std::string& cameraId);
 
     // Update the stored extension stats to the latest values
-    String16 updateExtensionStats(const hardware::CameraExtensionSessionStats& extStats);
+    std::string updateExtensionStats(const hardware::CameraExtensionSessionStats& extStats);
 };
 
 } // android
diff --git a/services/camera/libcameraservice/utils/CameraTraces.h b/services/camera/libcameraservice/utils/CameraTraces.h
index 71fa334..be8d393 100644
--- a/services/camera/libcameraservice/utils/CameraTraces.h
+++ b/services/camera/libcameraservice/utils/CameraTraces.h
@@ -18,7 +18,6 @@
 #define ANDROID_SERVERS_CAMERA_TRACES_H_
 
 #include <utils/Errors.h>
-#include <utils/String16.h>
 #include <utils/Vector.h>
 
 namespace android {
diff --git a/services/camera/libcameraservice/utils/LatencyHistogram.cpp b/services/camera/libcameraservice/utils/LatencyHistogram.cpp
index e2bdc43..a167068 100644
--- a/services/camera/libcameraservice/utils/LatencyHistogram.cpp
+++ b/services/camera/libcameraservice/utils/LatencyHistogram.cpp
@@ -16,8 +16,9 @@
 
 #define LOG_TAG "CameraLatencyHistogram"
 #include <inttypes.h>
+#include <android-base/stringprintf.h>
 #include <utils/Log.h>
-#include <utils/String8.h>
+#include <camera/StringUtils.h>
 
 #include "LatencyHistogram.h"
 
@@ -55,18 +56,18 @@
         return;
     }
 
-    String8 lines;
-    lines.appendFormat("%s (%" PRId64 ") samples\n", name, mTotalCount);
+    std::string lines;
+    lines += fmt::sprintf("%s (%" PRId64 ") samples\n", name, mTotalCount);
 
-    String8 lineBins, lineBinCounts;
+    std::string lineBins, lineBinCounts;
     formatHistogramText(lineBins, lineBinCounts);
 
-    lineBins.append("\n");
-    lineBinCounts.append("\n");
-    lines.append(lineBins);
-    lines.append(lineBinCounts);
+    lineBins += ("\n");
+    lineBinCounts += ("\n");
+    lines += lineBins;
+    lines += lineBinCounts;
 
-    write(fd, lines.string(), lines.size());
+    write(fd, lines.c_str(), lines.size());
 }
 
 void CameraLatencyHistogram::log(const char* fmt, ...) {
@@ -76,11 +77,12 @@
 
     va_list args;
     va_start(args, fmt);
-    String8 histogramName = String8::formatV(fmt, args);
-    ALOGI("%s (%" PRId64 ") samples:", histogramName.string(), mTotalCount);
+    std::string histogramName;
+    base::StringAppendV(&histogramName, fmt, args);
+    ALOGI("%s (%" PRId64 ") samples:", histogramName.c_str(), mTotalCount);
     va_end(args);
 
-    String8 lineBins, lineBinCounts;
+    std::string lineBins, lineBinCounts;
     formatHistogramText(lineBins, lineBinCounts);
 
     ALOGI("%s", lineBins.c_str());
@@ -88,19 +90,19 @@
 }
 
 void CameraLatencyHistogram::formatHistogramText(
-        String8& lineBins, String8& lineBinCounts) const {
+        std::string& lineBins, std::string& lineBinCounts) const {
     lineBins = "  ";
     lineBinCounts = "  ";
 
     for (int32_t i = 0; i < mBinCount; i++) {
         if (i == mBinCount - 1) {
-            lineBins.append("    inf (max ms)");
+            lineBins += "    inf (max ms)";
         } else {
-            lineBins.appendFormat("%7d", mBinSizeMs*(i+1));
+            lineBins += fmt::sprintf("%7d", mBinSizeMs*(i+1));
         }
-        lineBinCounts.appendFormat("   %02.2f", 100.0*mBins[i]/mTotalCount);
+        lineBinCounts += fmt::sprintf("   %02.2f", 100.0*mBins[i]/mTotalCount);
     }
-    lineBinCounts.append(" (%)");
+    lineBinCounts += " (%)";
 }
 
 }; //namespace android
diff --git a/services/camera/libcameraservice/utils/LatencyHistogram.h b/services/camera/libcameraservice/utils/LatencyHistogram.h
index bfd9b1b..89a9cc1 100644
--- a/services/camera/libcameraservice/utils/LatencyHistogram.h
+++ b/services/camera/libcameraservice/utils/LatencyHistogram.h
@@ -40,7 +40,7 @@
     std::vector<int64_t> mBins;
     uint64_t mTotalCount;
 
-    void formatHistogramText(String8& lineBins, String8& lineBinCounts) const;
+    void formatHistogramText(std::string& lineBins, std::string& lineBinCounts) const;
 }; // class CameraLatencyHistogram
 
 }; // namespace android
diff --git a/services/camera/libcameraservice/utils/SessionConfigurationUtils.cpp b/services/camera/libcameraservice/utils/SessionConfigurationUtils.cpp
index 89e75b3..f7257e3 100644
--- a/services/camera/libcameraservice/utils/SessionConfigurationUtils.cpp
+++ b/services/camera/libcameraservice/utils/SessionConfigurationUtils.cpp
@@ -28,6 +28,7 @@
 #include "device3/hidl/HidlCamera3Device.h"
 #include "device3/Camera3OutputStream.h"
 #include "system/graphics-base-v1.1.h"
+#include <camera/StringUtils.h>
 #include <ui/PublicFormat.h>
 
 using android::camera3::OutputStreamInfo;
@@ -427,15 +428,15 @@
 binder::Status createSurfaceFromGbp(
         OutputStreamInfo& streamInfo, bool isStreamInfoValid,
         sp<Surface>& surface, const sp<IGraphicBufferProducer>& gbp,
-        const String8 &logicalCameraId, const CameraMetadata &physicalCameraMetadata,
+        const std::string &logicalCameraId, const CameraMetadata &physicalCameraMetadata,
         const std::vector<int32_t> &sensorPixelModesUsed, int64_t dynamicRangeProfile,
         int64_t streamUseCase, int timestampBase, int mirrorMode,
         int32_t colorSpace) {
     // bufferProducer must be non-null
     if (gbp == nullptr) {
-        String8 msg = String8::format("Camera %s: Surface is NULL", logicalCameraId.string());
-        ALOGW("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Surface is NULL", logicalCameraId.c_str());
+        ALOGW("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     // HACK b/10949105
     // Query consumer usage bits to set async operation mode for
@@ -444,14 +445,14 @@
     uint64_t consumerUsage = 0;
     status_t err;
     if ((err = gbp->getConsumerUsage(&consumerUsage)) != OK) {
-        String8 msg = String8::format("Camera %s: Failed to query Surface consumer usage: %s (%d)",
-                logicalCameraId.string(), strerror(-err), err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Failed to query Surface consumer usage: %s (%d)",
+                logicalCameraId.c_str(), strerror(-err), err);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
     if (consumerUsage & GraphicBuffer::USAGE_HW_TEXTURE) {
         ALOGW("%s: Camera %s with consumer usage flag: %" PRIu64 ": Forcing asynchronous mode for"
-                "stream", __FUNCTION__, logicalCameraId.string(), consumerUsage);
+                "stream", __FUNCTION__, logicalCameraId.c_str(), consumerUsage);
         useAsync = true;
     }
 
@@ -469,38 +470,38 @@
     int width, height, format;
     android_dataspace dataSpace;
     if ((err = anw->query(anw, NATIVE_WINDOW_WIDTH, &width)) != OK) {
-        String8 msg = String8::format("Camera %s: Failed to query Surface width: %s (%d)",
-                 logicalCameraId.string(), strerror(-err), err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Failed to query Surface width: %s (%d)",
+                 logicalCameraId.c_str(), strerror(-err), err);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
     if ((err = anw->query(anw, NATIVE_WINDOW_HEIGHT, &height)) != OK) {
-        String8 msg = String8::format("Camera %s: Failed to query Surface height: %s (%d)",
-                logicalCameraId.string(), strerror(-err), err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Failed to query Surface height: %s (%d)",
+                logicalCameraId.c_str(), strerror(-err), err);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
     if ((err = anw->query(anw, NATIVE_WINDOW_FORMAT, &format)) != OK) {
-        String8 msg = String8::format("Camera %s: Failed to query Surface format: %s (%d)",
-                logicalCameraId.string(), strerror(-err), err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Failed to query Surface format: %s (%d)",
+                logicalCameraId.c_str(), strerror(-err), err);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
     if ((err = anw->query(anw, NATIVE_WINDOW_DEFAULT_DATASPACE,
             reinterpret_cast<int*>(&dataSpace))) != OK) {
-        String8 msg = String8::format("Camera %s: Failed to query Surface dataspace: %s (%d)",
-                logicalCameraId.string(), strerror(-err), err);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: Failed to query Surface dataspace: %s (%d)",
+                logicalCameraId.c_str(), strerror(-err), err);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_INVALID_OPERATION, msg.c_str());
     }
 
     if (colorSpace != ANDROID_REQUEST_AVAILABLE_COLOR_SPACE_PROFILES_MAP_UNSPECIFIED &&
             format != HAL_PIXEL_FORMAT_BLOB) {
         if (!dataSpaceFromColorSpace(&dataSpace, colorSpace)) {
-            String8 msg = String8::format("Camera %s: color space %d not supported, failed to "
-                    "convert to data space", logicalCameraId.string(), colorSpace);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+            std::string msg = fmt::sprintf("Camera %s: color space %d not supported, failed to "
+                    "convert to data space", logicalCameraId.c_str(), colorSpace);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
     }
 
@@ -510,16 +511,16 @@
             ((consumerUsage & GRALLOC_USAGE_HW_MASK) &&
              ((consumerUsage & GRALLOC_USAGE_SW_READ_MASK) == 0))) {
         ALOGW("%s: Camera %s: Overriding format %#x to IMPLEMENTATION_DEFINED",
-                __FUNCTION__, logicalCameraId.string(), format);
+                __FUNCTION__, logicalCameraId.c_str(), format);
         format = HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED;
     }
     std::unordered_set<int32_t> overriddenSensorPixelModes;
     if (checkAndOverrideSensorPixelModesUsed(sensorPixelModesUsed, format, width, height,
             physicalCameraMetadata, &overriddenSensorPixelModes) != OK) {
-        String8 msg = String8::format("Camera %s: sensor pixel modes for stream with "
-                "format %#x are not valid",logicalCameraId.string(), format);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: sensor pixel modes for stream with "
+                "format %#x are not valid",logicalCameraId.c_str(), format);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     bool foundInMaxRes = false;
     if (overriddenSensorPixelModes.find(ANDROID_SENSOR_PIXEL_MODE_MAXIMUM_RESOLUTION) !=
@@ -532,58 +533,58 @@
             !SessionConfigurationUtils::roundBufferDimensionNearest(width, height,
             format, dataSpace, physicalCameraMetadata, foundInMaxRes, /*out*/&width,
             /*out*/&height)) {
-        String8 msg = String8::format("Camera %s: No supported stream configurations with "
+        std::string msg = fmt::sprintf("Camera %s: No supported stream configurations with "
                 "format %#x defined, failed to create output stream",
-                logicalCameraId.string(), format);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+                logicalCameraId.c_str(), format);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (!SessionConfigurationUtils::isDynamicRangeProfileSupported(dynamicRangeProfile,
                 physicalCameraMetadata)) {
-        String8 msg = String8::format("Camera %s: Dynamic range profile 0x%" PRIx64
-                " not supported,failed to create output stream", logicalCameraId.string(),
+        std::string msg = fmt::sprintf("Camera %s: Dynamic range profile 0x%" PRIx64
+                " not supported,failed to create output stream", logicalCameraId.c_str(),
                 dynamicRangeProfile);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (SessionConfigurationUtils::is10bitDynamicRangeProfile(dynamicRangeProfile) &&
             !SessionConfigurationUtils::is10bitCompatibleFormat(format, dataSpace)) {
-        String8 msg = String8::format("Camera %s: No 10-bit supported stream configurations with "
+        std::string msg = fmt::sprintf("Camera %s: No 10-bit supported stream configurations with "
                 "format %#x defined and profile %" PRIx64 ", failed to create output stream",
-                logicalCameraId.string(), format, dynamicRangeProfile);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+                logicalCameraId.c_str(), format, dynamicRangeProfile);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (colorSpace != ANDROID_REQUEST_AVAILABLE_COLOR_SPACE_PROFILES_MAP_UNSPECIFIED &&
             SessionConfigurationUtils::deviceReportsColorSpaces(physicalCameraMetadata) &&
             !SessionConfigurationUtils::isColorSpaceSupported(colorSpace, format, dataSpace,
                     dynamicRangeProfile, physicalCameraMetadata)) {
-        String8 msg = String8::format("Camera %s: Color space %d not supported, failed to "
+        std::string msg = fmt::sprintf("Camera %s: Color space %d not supported, failed to "
                 "create output stream (pixel format %d dynamic range profile %" PRId64 ")",
-                logicalCameraId.string(), colorSpace, format, dynamicRangeProfile);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+                logicalCameraId.c_str(), colorSpace, format, dynamicRangeProfile);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (!SessionConfigurationUtils::isStreamUseCaseSupported(streamUseCase,
             physicalCameraMetadata)) {
-        String8 msg = String8::format("Camera %s: stream use case %" PRId64 " not supported,"
-                " failed to create output stream", logicalCameraId.string(), streamUseCase);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: stream use case %" PRId64 " not supported,"
+                " failed to create output stream", logicalCameraId.c_str(), streamUseCase);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (timestampBase < OutputConfiguration::TIMESTAMP_BASE_DEFAULT ||
             timestampBase > OutputConfiguration::TIMESTAMP_BASE_MAX) {
-        String8 msg = String8::format("Camera %s: invalid timestamp base %d",
-                logicalCameraId.string(), timestampBase);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: invalid timestamp base %d",
+                logicalCameraId.c_str(), timestampBase);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (mirrorMode < OutputConfiguration::MIRROR_MODE_AUTO ||
             mirrorMode > OutputConfiguration::MIRROR_MODE_V) {
-        String8 msg = String8::format("Camera %s: invalid mirroring mode %d",
-                logicalCameraId.string(), mirrorMode);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s: invalid mirroring mode %d",
+                logicalCameraId.c_str(), mirrorMode);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
 
     if (!isStreamInfoValid) {
@@ -601,45 +602,45 @@
         return binder::Status::ok();
     }
     if (width != streamInfo.width) {
-        String8 msg = String8::format("Camera %s:Surface width doesn't match: %d vs %d",
-                logicalCameraId.string(), width, streamInfo.width);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s:Surface width doesn't match: %d vs %d",
+                logicalCameraId.c_str(), width, streamInfo.width);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (height != streamInfo.height) {
-        String8 msg = String8::format("Camera %s:Surface height doesn't match: %d vs %d",
-                 logicalCameraId.string(), height, streamInfo.height);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s:Surface height doesn't match: %d vs %d",
+                 logicalCameraId.c_str(), height, streamInfo.height);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (format != streamInfo.format) {
-        String8 msg = String8::format("Camera %s:Surface format doesn't match: %d vs %d",
-                 logicalCameraId.string(), format, streamInfo.format);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg = fmt::sprintf("Camera %s:Surface format doesn't match: %d vs %d",
+                 logicalCameraId.c_str(), format, streamInfo.format);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     if (format != HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED) {
         if (dataSpace != streamInfo.dataSpace) {
-            String8 msg = String8::format("Camera %s:Surface dataSpace doesn't match: %d vs %d",
-                    logicalCameraId.string(), dataSpace, streamInfo.dataSpace);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+            std::string msg = fmt::sprintf("Camera %s:Surface dataSpace doesn't match: %d vs %d",
+                    logicalCameraId.c_str(), dataSpace, streamInfo.dataSpace);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
         //At the native side, there isn't a way to check whether 2 surfaces come from the same
         //surface class type. Use usage flag to approximate the comparison.
         if (consumerUsage != streamInfo.consumerUsage) {
-            String8 msg = String8::format(
+            std::string msg = fmt::sprintf(
                     "Camera %s:Surface usage flag doesn't match %" PRIu64 " vs %" PRIu64 "",
-                    logicalCameraId.string(), consumerUsage, streamInfo.consumerUsage);
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
-            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+                    logicalCameraId.c_str(), consumerUsage, streamInfo.consumerUsage);
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+            return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
         }
     }
     return binder::Status::ok();
 }
 
 void mapStreamInfo(const OutputStreamInfo &streamInfo,
-            camera3::camera_stream_rotation_t rotation, String8 physicalId,
+            camera3::camera_stream_rotation_t rotation, const std::string &physicalId,
             int32_t groupId, aidl::android::hardware::camera::device::Stream *stream /*out*/) {
     if (stream == nullptr) {
         return;
@@ -656,7 +657,7 @@
     stream->colorSpace = streamInfo.colorSpace;
     stream->rotation = AidlCamera3Device::mapToAidlStreamRotation(rotation);
     stream->id = -1; // Invalid stream id
-    stream->physicalCameraId = std::string(physicalId.string());
+    stream->physicalCameraId = physicalId;
     stream->bufferSize = 0;
     stream->groupId = groupId;
     stream->sensorPixelModesUsed.resize(streamInfo.sensorPixelModesUsed.size());
@@ -677,34 +678,35 @@
 binder::Status
 convertToHALStreamCombination(
         const SessionConfiguration& sessionConfiguration,
-        const String8 &logicalCameraId, const CameraMetadata &deviceInfo,
+        const std::string &logicalCameraId, const CameraMetadata &deviceInfo,
         bool isCompositeJpegRDisabled,
         metadataGetter getMetadata, const std::vector<std::string> &physicalCameraIds,
         aidl::android::hardware::camera::device::StreamConfiguration &streamConfiguration,
         bool overrideForPerfClass, bool *earlyExit) {
     using SensorPixelMode = aidl::android::hardware::camera::metadata::SensorPixelMode;
     auto operatingMode = sessionConfiguration.getOperatingMode();
-    binder::Status res = checkOperatingMode(operatingMode, deviceInfo, logicalCameraId);
+    binder::Status res = checkOperatingMode(operatingMode, deviceInfo,
+            logicalCameraId);
     if (!res.isOk()) {
         return res;
     }
 
     if (earlyExit == nullptr) {
-        String8 msg("earlyExit nullptr");
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        std::string msg("earlyExit nullptr");
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     *earlyExit = false;
     auto ret = AidlCamera3Device::mapToAidlStreamConfigurationMode(
             static_cast<camera_stream_configuration_mode_t> (operatingMode),
             /*out*/ &streamConfiguration.operationMode);
     if (ret != OK) {
-        String8 msg = String8::format(
+        std::string msg = fmt::sprintf(
             "Camera %s: Failed mapping operating mode %d requested: %s (%d)",
-            logicalCameraId.string(), operatingMode, strerror(-ret), ret);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
+            logicalCameraId.c_str(), operatingMode, strerror(-ret), ret);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
         return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
-                msg.string());
+                msg.c_str());
     }
 
     bool isInputValid = (sessionConfiguration.getInputWidth() > 0) &&
@@ -749,7 +751,7 @@
         const std::vector<sp<IGraphicBufferProducer>>& bufferProducers =
             it.getGraphicBufferProducers();
         bool deferredConsumer = it.isDeferred();
-        String8 physicalCameraId = String8(it.getPhysicalCameraId());
+        const std::string &physicalCameraId = it.getPhysicalCameraId();
 
         int64_t dynamicRangeProfile = it.getDynamicRangeProfile();
         int32_t colorSpace = it.getColorSpace();
@@ -841,11 +843,11 @@
                     }
 
                     if (ret != OK) {
-                        String8 msg = String8::format(
+                        std::string msg = fmt::sprintf(
                                 "Camera %s: Failed adding composite streams: %s (%d)",
-                                logicalCameraId.string(), strerror(-ret), ret);
-                        ALOGE("%s: %s", __FUNCTION__, msg.string());
-                        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+                                logicalCameraId.c_str(), strerror(-ret), ret);
+                        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+                        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
                     }
 
                     if (compositeStreams.size() == 0) {
@@ -877,17 +879,17 @@
 }
 
 binder::Status checkPhysicalCameraId(
-        const std::vector<std::string> &physicalCameraIds, const String8 &physicalCameraId,
-        const String8 &logicalCameraId) {
+        const std::vector<std::string> &physicalCameraIds, const std::string &physicalCameraId,
+        const std::string &logicalCameraId) {
     if (physicalCameraId.size() == 0) {
         return binder::Status::ok();
     }
     if (std::find(physicalCameraIds.begin(), physicalCameraIds.end(),
-        physicalCameraId.string()) == physicalCameraIds.end()) {
-        String8 msg = String8::format("Camera %s: Camera doesn't support physicalCameraId %s.",
-                logicalCameraId.string(), physicalCameraId.string());
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
-        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.string());
+        physicalCameraId) == physicalCameraIds.end()) {
+        std::string msg = fmt::sprintf("Camera %s: Camera doesn't support physicalCameraId %s.",
+                logicalCameraId.c_str(), physicalCameraId.c_str());
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
+        return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT, msg.c_str());
     }
     return binder::Status::ok();
 }
@@ -915,13 +917,13 @@
 }
 
 binder::Status checkOperatingMode(int operatingMode,
-        const CameraMetadata &staticInfo, const String8 &cameraId) {
+        const CameraMetadata &staticInfo, const std::string &cameraId) {
     if (operatingMode < 0) {
-        String8 msg = String8::format(
-            "Camera %s: Invalid operating mode %d requested", cameraId.string(), operatingMode);
-        ALOGE("%s: %s", __FUNCTION__, msg.string());
+        std::string msg = fmt::sprintf(
+            "Camera %s: Invalid operating mode %d requested", cameraId.c_str(), operatingMode);
+        ALOGE("%s: %s", __FUNCTION__, msg.c_str());
         return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
-                msg.string());
+                msg.c_str());
     }
 
     bool isConstrainedHighSpeed = (operatingMode == ICameraDeviceUser::CONSTRAINED_HIGH_SPEED_MODE);
@@ -936,12 +938,12 @@
             }
         }
         if (!isConstrainedHighSpeedSupported) {
-            String8 msg = String8::format(
+            std::string msg = fmt::sprintf(
                 "Camera %s: Try to create a constrained high speed configuration on a device"
-                " that doesn't support it.", cameraId.string());
-            ALOGE("%s: %s", __FUNCTION__, msg.string());
+                " that doesn't support it.", cameraId.c_str());
+            ALOGE("%s: %s", __FUNCTION__, msg.c_str());
             return STATUS_ERROR(CameraService::ERROR_ILLEGAL_ARGUMENT,
-                    msg.string());
+                    msg.c_str());
         }
     }
 
diff --git a/services/camera/libcameraservice/utils/SessionConfigurationUtils.h b/services/camera/libcameraservice/utils/SessionConfigurationUtils.h
index dc143da..79d80ea 100644
--- a/services/camera/libcameraservice/utils/SessionConfigurationUtils.h
+++ b/services/camera/libcameraservice/utils/SessionConfigurationUtils.h
@@ -21,6 +21,7 @@
 #include <camera/camera2/OutputConfiguration.h>
 #include <camera/camera2/SessionConfiguration.h>
 #include <camera/camera2/SubmitInfo.h>
+#include <camera/StringUtils.h>
 #include <aidl/android/hardware/camera/device/ICameraDevice.h>
 #include <android/hardware/camera/device/3.4/ICameraDeviceSession.h>
 #include <android/hardware/camera/device/3.7/ICameraDeviceSession.h>
@@ -37,17 +38,18 @@
 
 #define STATUS_ERROR(errorCode, errorString) \
     binder::Status::fromServiceSpecificError(errorCode, \
-            String8::format("%s:%d: %s", __FUNCTION__, __LINE__, errorString))
+            fmt::sprintf("%s:%d: %s", __FUNCTION__, __LINE__, errorString).c_str())
 
 #define STATUS_ERROR_FMT(errorCode, errorString, ...) \
     binder::Status::fromServiceSpecificError(errorCode, \
-            String8::format("%s:%d: " errorString, __FUNCTION__, __LINE__, \
-                    __VA_ARGS__))
+            fmt::sprintf("%s:%d: " errorString, __FUNCTION__, __LINE__, \
+                    __VA_ARGS__).c_str())
 
 namespace android {
 namespace camera3 {
 
-typedef std::function<CameraMetadata (const String8 &, bool overrideForPerfClass)> metadataGetter;
+typedef std::function<CameraMetadata (const std::string &, bool overrideForPerfClass)>
+        metadataGetter;
 
 class StreamConfiguration {
 public:
@@ -96,7 +98,7 @@
 binder::Status createSurfaceFromGbp(
         camera3::OutputStreamInfo& streamInfo, bool isStreamInfoValid,
         sp<Surface>& surface, const sp<IGraphicBufferProducer>& gbp,
-        const String8 &logicalCameraId, const CameraMetadata &physicalCameraMetadata,
+        const std::string &logicalCameraId, const CameraMetadata &physicalCameraMetadata,
         const std::vector<int32_t> &sensorPixelModesUsed,  int64_t dynamicRangeProfile,
         int64_t streamUseCase, int timestampBase, int mirrorMode,
         int32_t colorSpace);
@@ -120,26 +122,27 @@
 bool isStreamUseCaseSupported(int64_t streamUseCase, const CameraMetadata &deviceInfo);
 
 void mapStreamInfo(const OutputStreamInfo &streamInfo,
-        camera3::camera_stream_rotation_t rotation, String8 physicalId,
+        camera3::camera_stream_rotation_t rotation, const std::string &physicalId,
         int32_t groupId, aidl::android::hardware::camera::device::Stream *stream /*out*/);
 
 // Check that the physicalCameraId passed in is spported by the camera
 // device.
 binder::Status checkPhysicalCameraId(
-const std::vector<std::string> &physicalCameraIds, const String8 &physicalCameraId,
-const String8 &logicalCameraId);
+const std::vector<std::string> &physicalCameraIds, const std::string &physicalCameraId,
+const std::string &logicalCameraId);
 
 binder::Status checkSurfaceType(size_t numBufferProducers,
 bool deferredConsumer, int surfaceType);
 
 binder::Status checkOperatingMode(int operatingMode,
-const CameraMetadata &staticInfo, const String8 &cameraId);
+const CameraMetadata &staticInfo, const std::string &cameraId);
 
 binder::Status
 convertToHALStreamCombination(
     const SessionConfiguration& sessionConfiguration,
-    const String8 &logicalCameraId, const CameraMetadata &deviceInfo, bool isCompositeJpegRDisabled,
-    metadataGetter getMetadata, const std::vector<std::string> &physicalCameraIds,
+    const std::string &logicalCameraId, const CameraMetadata &deviceInfo,
+    bool isCompositeJpegRDisabled, metadataGetter getMetadata,
+    const std::vector<std::string> &physicalCameraIds,
     aidl::android::hardware::camera::device::StreamConfiguration &streamConfiguration,
     bool overrideForPerfClass, bool *earlyExit);
 
diff --git a/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.cpp b/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.cpp
index 111c1bf..cf93d3b 100644
--- a/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.cpp
+++ b/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.cpp
@@ -105,7 +105,7 @@
 binder::Status
 convertToHALStreamCombination(
         const SessionConfiguration& sessionConfiguration,
-        const String8 &logicalCameraId, const CameraMetadata &deviceInfo,
+        const std::string &logicalCameraId, const CameraMetadata &deviceInfo,
         metadataGetter getMetadata, const std::vector<std::string> &physicalCameraIds,
         hardware::camera::device::V3_7::StreamConfiguration &streamConfiguration,
         bool overrideForPerfClass, bool *earlyExit) {
diff --git a/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.h b/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.h
index c47abe0..eae2e30 100644
--- a/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.h
+++ b/services/camera/libcameraservice/utils/SessionConfigurationUtilsHidl.h
@@ -34,7 +34,7 @@
 // isn't valid.
 binder::Status
 convertToHALStreamCombination(const SessionConfiguration& sessionConfiguration,
-        const String8 &cameraId, const CameraMetadata &deviceInfo,
+        const std::string &cameraId, const CameraMetadata &deviceInfo,
         metadataGetter getMetadata, const std::vector<std::string> &physicalCameraIds,
         hardware::camera::device::V3_7::StreamConfiguration &streamConfiguration,
         bool overrideForPerfClass, bool *earlyExit);
diff --git a/services/camera/libcameraservice/utils/TagMonitor.cpp b/services/camera/libcameraservice/utils/TagMonitor.cpp
index d1e54ab..38de93a 100644
--- a/services/camera/libcameraservice/utils/TagMonitor.cpp
+++ b/services/camera/libcameraservice/utils/TagMonitor.cpp
@@ -18,11 +18,15 @@
 #define ATRACE_TAG ATRACE_TAG_CAMERA
 //#define LOG_NDEBUG 0
 
+#include <iostream>
+#include <sstream>
+
 #include "TagMonitor.h"
 
 #include <inttypes.h>
 #include <utils/Log.h>
 #include <camera/VendorTagDescriptor.h>
+#include <camera/StringUtils.h>
 #include <camera_metadata_hidden.h>
 #include <device3/Camera3Stream.h>
 
@@ -44,7 +48,7 @@
         mMonitoringEvents(other.mMonitoringEvents),
         mVendorTagId(other.mVendorTagId) {}
 
-const String16 TagMonitor::kMonitorOption = String16("-m");
+const std::string TagMonitor::kMonitorOption("-m");
 
 const char* TagMonitor::k3aTags =
         "android.control.aeMode, android.control.afMode, android.control.awbMode,"
@@ -56,17 +60,17 @@
         "android.control.effectMode, android.control.mode, android.control.sceneMode,"
         "android.control.videoStabilizationMode";
 
-void TagMonitor::parseTagsToMonitor(String8 tagNames) {
+void TagMonitor::parseTagsToMonitor(std::string tagNames) {
     std::lock_guard<std::mutex> lock(mMonitorMutex);
 
     // Expand shorthands
     ssize_t idx = tagNames.find("3a");
     if (idx != -1) {
         ssize_t end = tagNames.find(",", idx);
-        char* start = tagNames.lockBuffer(tagNames.size());
-        start[idx] = '\0';
-        char* rest = (end != -1) ? (start + end) : (start + tagNames.size());
-        tagNames = String8::format("%s%s%s", start, k3aTags, rest);
+        tagNames = tagNames.substr(0, idx) + k3aTags;
+        if (end != -1) {
+            tagNames += tagNames.substr(end);
+        }
     }
 
     sp<VendorTagDescriptor> vTags =
@@ -81,14 +85,13 @@
 
     bool gotTag = false;
 
-    char *tokenized = tagNames.lockBuffer(tagNames.size());
-    char *savePtr;
-    char *nextTagName = strtok_r(tokenized, ", ", &savePtr);
-    while (nextTagName != nullptr) {
+    std::istringstream iss(tagNames);
+    std::string nextTagName;
+    while (std::getline(iss, nextTagName, ',')) {
         uint32_t tag;
-        status_t res = CameraMetadata::getTagFromName(nextTagName, vTags.get(), &tag);
+        status_t res = CameraMetadata::getTagFromName(nextTagName.c_str(), vTags.get(), &tag);
         if (res != OK) {
-            ALOGW("%s: Unknown tag %s, ignoring", __FUNCTION__, nextTagName);
+            ALOGW("%s: Unknown tag %s, ignoring", __FUNCTION__, nextTagName.c_str());
         } else {
             if (!gotTag) {
                 mMonitoredTagList.clear();
@@ -96,11 +99,9 @@
             }
             mMonitoredTagList.push_back(tag);
         }
-        nextTagName = strtok_r(nullptr, ", ", &savePtr);
+        iss >> std::ws;
     }
 
-    tagNames.unlockBuffer();
-
     if (gotTag) {
         // Got at least one new tag
         mMonitoringEnabled = true;
@@ -269,7 +270,7 @@
 
     for (const auto& event : mMonitoringEvents) {
         int indentation = (event.source == REQUEST) ? 15 : 30;
-        String8 eventString = String8::format("f%d:%" PRId64 "ns:%*s%*s",
+        std::string eventString = fmt::sprintf("f%d:%" PRId64 "ns:%*s%*s",
                 event.frameNumber, event.timestamp,
                 2, event.cameraId.c_str(),
                 indentation,
@@ -278,20 +279,20 @@
         if (!event.outputStreamIds.empty()) {
             eventString += " output stream ids:";
             for (const auto& id : event.outputStreamIds) {
-                eventString.appendFormat(" %d", id);
+                eventString += fmt::sprintf(" %d", id);
             }
             eventString += "\n";
-            vec.emplace_back(eventString.string());
+            vec.emplace_back(eventString);
             continue;
         }
 
         if (event.inputStreamId != -1) {
-            eventString.appendFormat(" input stream id: %d\n", event.inputStreamId);
-            vec.emplace_back(eventString.string());
+            eventString += fmt::sprintf(" input stream id: %d\n", event.inputStreamId);
+            vec.emplace_back(eventString);
             continue;
         }
 
-        eventString += String8::format(
+        eventString += fmt::sprintf(
                 "%s.%s: ",
                 get_local_camera_metadata_section_name_vendor_id(event.tag, mVendorTagId),
                 get_local_camera_metadata_tag_name_vendor_id(event.tag, mVendorTagId));
@@ -303,14 +304,14 @@
                     event.newData.data(), event.tag, event.type,
                     event.newData.size() / camera_metadata_type_size[event.type], indentation + 18);
         }
-        vec.emplace_back(eventString.string());
+        vec.emplace_back(eventString);
     }
 }
 
 #define CAMERA_METADATA_ENUM_STRING_MAX_SIZE 29
 
-String8 TagMonitor::getEventDataString(const uint8_t* data_ptr, uint32_t tag, int type, int count,
-                                       int indentation) {
+std::string TagMonitor::getEventDataString(const uint8_t* data_ptr, uint32_t tag, int type,
+        int count, int indentation) {
     static int values_per_line[NUM_TYPES] = {
         [TYPE_BYTE]     = 16,
         [TYPE_INT32]    = 8,
@@ -327,11 +328,11 @@
     int lines = count / values_per_line[type];
     if (count % values_per_line[type] != 0) lines++;
 
-    String8 returnStr = String8();
+    std::ostringstream returnStr;
     int index = 0;
     int j, k;
     for (j = 0; j < lines; j++) {
-        returnStr.appendFormat("%*s[", (j != 0) ? indentation + 4 : 0, "");
+        returnStr << fmt::sprintf("%*s[", (j != 0) ? indentation + 4 : 0, "");
         for (k = 0;
              k < values_per_line[type] && count > 0;
              k++, count--, index += type_size) {
@@ -344,9 +345,9 @@
                                                      value_string_tmp,
                                                      sizeof(value_string_tmp))
                         == OK) {
-                        returnStr += value_string_tmp;
+                        returnStr << value_string_tmp;
                     } else {
-                        returnStr.appendFormat("%hhu ", *(data_ptr + index));
+                        returnStr << fmt::sprintf("%hhu ", *(data_ptr + index));
                     }
                     break;
                 case TYPE_INT32:
@@ -357,33 +358,33 @@
                                                      value_string_tmp,
                                                      sizeof(value_string_tmp))
                         == OK) {
-                        returnStr += value_string_tmp;
+                        returnStr << value_string_tmp;
                     } else {
-                        returnStr.appendFormat("%" PRId32 " ", *(int32_t*)(data_ptr + index));
+                        returnStr << fmt::sprintf("%" PRId32 " ", *(int32_t*)(data_ptr + index));
                     }
                     break;
                 case TYPE_FLOAT:
-                    returnStr.appendFormat("%0.8f ", *(float*)(data_ptr + index));
+                    returnStr << fmt::sprintf("%0.8f ", *(float*)(data_ptr + index));
                     break;
                 case TYPE_INT64:
-                    returnStr.appendFormat("%" PRId64 " ", *(int64_t*)(data_ptr + index));
+                    returnStr << fmt::sprintf("%" PRId64 " ", *(int64_t*)(data_ptr + index));
                     break;
                 case TYPE_DOUBLE:
-                    returnStr.appendFormat("%0.8f ", *(double*)(data_ptr + index));
+                    returnStr << fmt::sprintf("%0.8f ", *(double*)(data_ptr + index));
                     break;
                 case TYPE_RATIONAL: {
                     int32_t numerator = *(int32_t*)(data_ptr + index);
                     int32_t denominator = *(int32_t*)(data_ptr + index + 4);
-                    returnStr.appendFormat("(%d / %d) ", numerator, denominator);
+                    returnStr << fmt::sprintf("(%d / %d) ", numerator, denominator);
                     break;
                 }
                 default:
-                    returnStr += "??? ";
+                    returnStr << "??? ";
             }
         }
-        returnStr += "]\n";
+        returnStr << "]\n";
     }
-    return returnStr;
+    return std::move(returnStr.str());
 }
 
 template<typename T>
diff --git a/services/camera/libcameraservice/utils/TagMonitor.h b/services/camera/libcameraservice/utils/TagMonitor.h
index 9ded15d..bff4de0 100644
--- a/services/camera/libcameraservice/utils/TagMonitor.h
+++ b/services/camera/libcameraservice/utils/TagMonitor.h
@@ -21,9 +21,9 @@
 #include <atomic>
 #include <mutex>
 #include <unordered_map>
+#include <string>
 
 #include <utils/RefBase.h>
-#include <utils/String8.h>
 #include <utils/Timers.h>
 
 #include <media/RingBuffer.h>
@@ -42,7 +42,7 @@
   public:
 
     // Monitor argument
-    static const String16 kMonitorOption;
+    static const std::string kMonitorOption;
 
     enum eventSource {
         REQUEST,
@@ -59,7 +59,7 @@
     // If invalid, do nothing.
     // Recognizes "3a" as a shortcut for enabling tracking 3A state, mode, and
     // triggers
-    void parseTagsToMonitor(String8 tagNames);
+    void parseTagsToMonitor(std::string tagNames);
 
     // Disable monitoring; does not clear the event log
     void disableMonitoring();
@@ -85,8 +85,8 @@
     // function.
     void dumpMonitoredTagEventsToVectorLocked(std::vector<std::string> &out);
 
-    static String8 getEventDataString(const uint8_t* data_ptr, uint32_t tag, int type, int count,
-                                      int indentation);
+    static std::string getEventDataString(const uint8_t* data_ptr, uint32_t tag, int type,
+            int count, int indentation);
 
     void monitorSingleMetadata(TagMonitor::eventSource source, int64_t frameNumber,
             nsecs_t timestamp, const std::string& cameraId, uint32_t tag,