diff --git a/libs/binder/ActivityManager.cpp b/libs/binder/ActivityManager.cpp
index 2728f35..28d0e4f 100644
--- a/libs/binder/ActivityManager.cpp
+++ b/libs/binder/ActivityManager.cpp
@@ -34,16 +34,16 @@
     std::lock_guard<Mutex> scoped_lock(mLock);
     int64_t startTime = 0;
     sp<IActivityManager> service = mService;
-    while (service == NULL || !IInterface::asBinder(service)->isBinderAlive()) {
+    while (service == nullptr || !IInterface::asBinder(service)->isBinderAlive()) {
         sp<IBinder> binder = defaultServiceManager()->checkService(String16("activity"));
-        if (binder == NULL) {
+        if (binder == nullptr) {
             // Wait for the activity service to come back...
             if (startTime == 0) {
                 startTime = uptimeMillis();
                 ALOGI("Waiting for activity service");
             } else if ((uptimeMillis() - startTime) > 1000000) {
                 ALOGW("Waiting too long for activity service, giving up");
-                service = NULL;
+                service = nullptr;
                 break;
             }
             usleep(25000);
@@ -58,7 +58,7 @@
 int ActivityManager::openContentUri(const String16& stringUri)
 {
     sp<IActivityManager> service = getService();
-    return service != NULL ? service->openContentUri(stringUri) : -1;
+    return service != nullptr ? service->openContentUri(stringUri) : -1;
 }
 
 void ActivityManager::registerUidObserver(const sp<IUidObserver>& observer,
@@ -67,7 +67,7 @@
                                           const String16& callingPackage)
 {
     sp<IActivityManager> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         service->registerUidObserver(observer, event, cutpoint, callingPackage);
     }
 }
@@ -75,7 +75,7 @@
 void ActivityManager::unregisterUidObserver(const sp<IUidObserver>& observer)
 {
     sp<IActivityManager> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         service->unregisterUidObserver(observer);
     }
 }
@@ -83,7 +83,7 @@
 bool ActivityManager::isUidActive(const uid_t uid, const String16& callingPackage)
 {
     sp<IActivityManager> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         return service->isUidActive(uid, callingPackage);
     }
     return false;
@@ -91,7 +91,7 @@
 
 status_t ActivityManager::linkToDeath(const sp<IBinder::DeathRecipient>& recipient) {
     sp<IActivityManager> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         return IInterface::asBinder(service)->linkToDeath(recipient);
     }
     return INVALID_OPERATION;
@@ -99,7 +99,7 @@
 
 status_t ActivityManager::unlinkToDeath(const sp<IBinder::DeathRecipient>& recipient) {
     sp<IActivityManager> service = getService();
-    if (service != NULL) {
+    if (service != nullptr) {
         return IInterface::asBinder(service)->unlinkToDeath(recipient);
     }
     return INVALID_OPERATION;
diff --git a/libs/binder/PermissionController.cpp b/libs/binder/PermissionController.cpp
index 96df33c..34b2ca5 100644
--- a/libs/binder/PermissionController.cpp
+++ b/libs/binder/PermissionController.cpp
@@ -41,7 +41,7 @@
                 ALOGI("Waiting for permission service");
             } else if ((uptimeMillis() - startTime) > 10000) {
                 ALOGW("Waiting too long for permission service, giving up");
-                service = NULL;
+                service = nullptr;
                 break;
             }
             sleep(1);
@@ -56,13 +56,13 @@
 bool PermissionController::checkPermission(const String16& permission, int32_t pid, int32_t uid)
 {
     sp<IPermissionController> service = getService();
-    return service != NULL ? service->checkPermission(permission, pid, uid) : false;
+    return service != nullptr ? service->checkPermission(permission, pid, uid) : false;
 }
 
 int32_t PermissionController::noteOp(const String16& op, int32_t uid, const String16& packageName)
 {
     sp<IPermissionController> service = getService();
-    return service != NULL ? service->noteOp(op, uid, packageName) : MODE_ERRORED;
+    return service != nullptr ? service->noteOp(op, uid, packageName) : MODE_ERRORED;
 }
 
 void PermissionController::getPackagesForUid(const uid_t uid, Vector<String16> &packages)