diff --git a/camera/ndk/impl/ACameraCaptureSession.h b/camera/ndk/impl/ACameraCaptureSession.h
index 58428e6..f56219c 100644
--- a/camera/ndk/impl/ACameraCaptureSession.h
+++ b/camera/ndk/impl/ACameraCaptureSession.h
@@ -24,7 +24,7 @@
 using namespace android;
 
 struct ACaptureSessionOutput {
-    ACaptureSessionOutput(ANativeWindow* window) : mWindow(window) {};
+    explicit ACaptureSessionOutput(ANativeWindow* window) : mWindow(window) {};
 
     bool operator == (const ACaptureSessionOutput& other) const {
         return mWindow == other.mWindow;
diff --git a/camera/ndk/impl/ACameraDevice.h b/camera/ndk/impl/ACameraDevice.h
index 71e364d..051462b 100644
--- a/camera/ndk/impl/ACameraDevice.h
+++ b/camera/ndk/impl/ACameraDevice.h
@@ -65,7 +65,7 @@
     // Callbacks from camera service
     class ServiceCallback : public hardware::camera2::BnCameraDeviceCallbacks {
       public:
-        ServiceCallback(CameraDevice* device) : mDevice(device) {}
+        explicit ServiceCallback(CameraDevice* device) : mDevice(device) {}
         binder::Status onDeviceError(int32_t errorCode,
                            const CaptureResultExtras& resultExtras) override;
         binder::Status onDeviceIdle() override;
diff --git a/camera/ndk/impl/ACameraManager.h b/camera/ndk/impl/ACameraManager.h
index 3f2262f..5b88904 100644
--- a/camera/ndk/impl/ACameraManager.h
+++ b/camera/ndk/impl/ACameraManager.h
@@ -60,7 +60,7 @@
 
     class DeathNotifier : public IBinder::DeathRecipient {
       public:
-        DeathNotifier(CameraManagerGlobal* cm) : mCameraManager(cm) {}
+        explicit DeathNotifier(CameraManagerGlobal* cm) : mCameraManager(cm) {}
       protected:
         // IBinder::DeathRecipient implementation
         virtual void binderDied(const wp<IBinder>& who);
@@ -71,7 +71,7 @@
 
     class CameraServiceListener final : public hardware::BnCameraServiceListener {
       public:
-        CameraServiceListener(CameraManagerGlobal* cm) : mCameraManager(cm) {}
+        explicit CameraServiceListener(CameraManagerGlobal* cm) : mCameraManager(cm) {}
         virtual binder::Status onStatusChanged(int32_t status, int32_t cameraId);
 
         // Torch API not implemented yet
@@ -86,7 +86,7 @@
 
     // Wrapper of ACameraManager_AvailabilityCallbacks so we can store it in std::set
     struct Callback {
-        Callback(const ACameraManager_AvailabilityCallbacks *callback) :
+        explicit Callback(const ACameraManager_AvailabilityCallbacks *callback) :
             mAvailable(callback->onCameraAvailable),
             mUnavailable(callback->onCameraUnavailable),
             mContext(callback->context) {}
diff --git a/camera/ndk/impl/ACaptureRequest.h b/camera/ndk/impl/ACaptureRequest.h
index 6bd8406..3ef6a84 100644
--- a/camera/ndk/impl/ACaptureRequest.h
+++ b/camera/ndk/impl/ACaptureRequest.h
@@ -22,7 +22,7 @@
 using namespace android;
 
 struct ACameraOutputTarget {
-    ACameraOutputTarget(ANativeWindow* window) : mWindow(window) {};
+    explicit ACameraOutputTarget(ANativeWindow* window) : mWindow(window) {};
 
     bool operator == (const ACameraOutputTarget& other) const {
         return mWindow == other.mWindow;
diff --git a/include/camera/Camera.h b/include/camera/Camera.h
index be793a2..57dc228 100644
--- a/include/camera/Camera.h
+++ b/include/camera/Camera.h
@@ -170,7 +170,7 @@
     class RecordingProxy : public BnCameraRecordingProxy
     {
     public:
-        RecordingProxy(const sp<Camera>& camera);
+        explicit RecordingProxy(const sp<Camera>& camera);
 
         // ICameraRecordingProxy interface
         virtual status_t startRecording(const sp<ICameraRecordingProxyListener>& listener);
@@ -183,7 +183,7 @@
     };
 
 protected:
-                        Camera(int cameraId);
+    explicit            Camera(int cameraId);
                         Camera(const Camera&);
                         Camera& operator=(const Camera);
 
diff --git a/services/camera/libcameraservice/device3/Camera3BufferManager.h b/services/camera/libcameraservice/device3/Camera3BufferManager.h
index ab6541e..b5b86a3 100644
--- a/services/camera/libcameraservice/device3/Camera3BufferManager.h
+++ b/services/camera/libcameraservice/device3/Camera3BufferManager.h
@@ -44,7 +44,7 @@
  */
 class Camera3BufferManager: public virtual RefBase {
 public:
-    Camera3BufferManager(const sp<IGraphicBufferAlloc>& allocator = NULL);
+    explicit Camera3BufferManager(const sp<IGraphicBufferAlloc>& allocator = NULL);
 
     virtual ~Camera3BufferManager();
 
@@ -195,7 +195,7 @@
     struct GraphicBufferEntry {
         sp<GraphicBuffer> graphicBuffer;
         int fenceFd;
-        GraphicBufferEntry(const sp<GraphicBuffer>& gb = 0, int fd = -1) :
+        explicit GraphicBufferEntry(const sp<GraphicBuffer>& gb = 0, int fd = -1) :
             graphicBuffer(gb),
             fenceFd(fd) {}
     };
diff --git a/services/camera/libcameraservice/device3/Camera3OutputStream.h b/services/camera/libcameraservice/device3/Camera3OutputStream.h
index 7f7d6d2..46c1465 100644
--- a/services/camera/libcameraservice/device3/Camera3OutputStream.h
+++ b/services/camera/libcameraservice/device3/Camera3OutputStream.h
@@ -46,7 +46,7 @@
     uint32_t combinedUsage;
     size_t totalBufferCount;
     bool isConfigured;
-    StreamInfo(int id = CAMERA3_STREAM_ID_INVALID,
+    explicit StreamInfo(int id = CAMERA3_STREAM_ID_INVALID,
             int setId = CAMERA3_STREAM_SET_ID_INVALID,
             uint32_t w = 0,
             uint32_t h = 0,