android.hardware.camera2.CameraAccessException: CAMERA_DISCONNECTED (2)：cancelRequest:473:照相机不再存活
android.hardware.camera2.CameraAccessException: CAMERA_DISCONNECTED (2)：cancelRequest:473:照相机不再存活
提问于 2020-12-26 16:43:50
运行我的应用程序，我可以看到完美摄像头视图，现在我打开内置的摄像头应用程序，并再次切换到我自己的应用程序(在这里，我是只获得了黑色屏幕)。
日志
2020-12-26 16:57:45.696 16445-16768/app.video I/CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_IDLE for client app.video API Level 2
2020-12-26 16:57:45.883 16445-16768/app.video I/CameraManagerGlobal: Camera 0 facing CAMERA_FACING_BACK state now CAMERA_STATE_CLOSED for client app.video API Level 2
2020-12-26 16:57:45.886 16445-16596/app.video E/CameraCaptureSession: Session 0: Exception while stopping repeating:
android.hardware.camera2.CameraAccessException: CAMERA_DISCONNECTED (2): cancelRequest:473: Camera device no longer alive
at android.hardware.camera2.CameraManager.throwAsPublicException(CameraManager.java:1127)
at android.hardware.camera2.impl.ICameraDeviceUserWrapper.cancelRequest(ICameraDeviceUserWrapper.java:97)
at android.hardware.camera2.impl.CameraDeviceImpl.stopRepeating(CameraDeviceImpl.java:1151)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.close(CameraCaptureSessionImpl.java:526)
at android.hardware.camera2.impl.CameraCaptureSessionImpl$2.onDisconnected(CameraCaptureSessionImpl.java:737)
at android.hardware.camera2.impl.CameraDeviceImpl$7.run(CameraDeviceImpl.java:244)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.os.HandlerThread.run(HandlerThread.java:67)
Caused by: android.os.ServiceSpecificException: cancelRequest:473: Camera device no longer alive (code 4)
at android.os.Parcel.createException(Parcel.java:2102)
at android.os.Parcel.readException(Parcel.java:2056)
at android.os.Parcel.readException(Parcel.java:2004)
at android.hardware.camera2.ICameraDeviceUser$Stub$Proxy.cancelRequest(ICameraDeviceUser.java:676)
at android.hardware.camera2.impl.ICameraDeviceUserWrapper.cancelRequest(ICameraDeviceUserWrapper.java:95)
at android.hardware.camera2.impl.CameraDeviceImpl.stopRepeating(CameraDeviceImpl.java:1151)
at android.hardware.camera2.impl.CameraCaptureSessionImpl.close(CameraCaptureSessionImpl.java:526)
at android.hardware.camera2.impl.CameraCaptureSessionImpl$2.onDisconnected(CameraCaptureSessionImpl.java:737)
at android.hardware.camera2.impl.CameraDeviceImpl$7.run(CameraDeviceImpl.java:244)
at android.os.Handler.handleCallback(Handler.java:883)
at android.os.Handler.dispatchMessage(Handler.java:100)
at android.os.Looper.loop(Looper.java:237)
at android.os.HandlerThread.run(HandlerThread.java:67)
2020-12-26 16:57:45.886 16445-16596/app.video I/org.webrtc.Logging: Camera2Session: Stop internal
2020-12-26 16:57:45.887 16445-16596/app.video I/org.webrtc.Logging: SurfaceTextureHelper: stopListening()
2020-12-26 16:57:45.887 16445-16468/app.video W/app.video: Long monitor contention with owner CaptureThread (16596) at boolean android.os.BinderProxy.transactNative(int, android.os.Parcel, android.os.Parcel, int)(BinderProxy.java:-2) waiters=0 in void android.hardware.camera2.impl.CameraDeviceImpl$CameraDeviceCallbacks.onCaptureStarted(android.hardware.camera2.impl.CaptureResultExtras, long) for 381ms
2020-12-26 16:57:45.890 16445-16596/app.video I/org.webrtc.Logging: Camera2Session: Stop done
2020-12-26 16:57:45.890 16445-16596/app.video I/org.webrtc.Logging: CameraCapturer: Stop capture
2020-12-26 16:57:45.890 16445-16596/app.video I/org.webrtc.Logging: CameraCapturer: Stop capture: Nulling session
2020-12-26 16:57:45.891 16445-16596/app.video I/org.webrtc.Logging: CameraCapturer: Stop capture done
2020-12-26 16:57:45.891 16445-16596/app.video I/org.webrtc.Logging: Camera2Session: Camera device closed.
2020-12-26 16:57:45.892 16445-16596/app.video I/org.webrtc.Logging: Camera2Session: Stop camera2 session on camera 0
2020-12-26 16:57:45.892 16445-16768/app.video I/CameraManagerGlobal: Camera 1 facing CAMERA_FACING_FRONT state now CAMERA_STATE_OPEN for client com.sec.android.app.camera API Level 1
2020-12-26 16:57:46.274 16445-16839/app.video I/CameraManagerGlobal: Camera 1 facing CAMERA_FACING_FRONT state now CAMERA_STATE_ACTIVE for client com.sec.android.app.camera API Level 1XML
<com.src.webrtc.android.VideoView
android:id="@+id/main_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />代码
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
viewModel = ViewModelProvider(
this,
ViewModelFactory.getInstance(application)
).get(MainViewModel::class.java)
binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
binding.viewModel = this.viewModel
binding.lifecycleOwner = this
binding.apply {
peerViews.add(mainView)
peerViews.add(subView1)
for (i in viewRenderers.indices) {
viewRenderers[i].setTarget(peerViews[i])
}
}
viewModel.room.observe(this, Observer {
Log.d(TAG, "observe room $it")
if (it != null) {
binding.mainView.apply {
init(null)
setScalingType(RendererCommon.ScalingType.SCALE_ASPECT_FIT)
setEnableHardwareScaler(false)
}
initSubView(it, binding.subView1)
} else {
binding.mainView.clearImage()
binding.subView1.clearImage()
Handler().postDelayed({
binding.mainView.release()
binding.subView1.release()
}, 100)
}
})
}回答 2
Stack Overflow用户
发布于 2020-12-30 05:10:34
当你把你的应用程序放在背景中，然后将相机从这个应用程序中分离出来，你可以用onPause()方法完成这个任务，然后在onResume()方法中重新附加这个程序，然后再打开这个应用程序。
Stack Overflow用户
发布于 2020-12-30 07:04:49
在你的相机activity里这样做
@Override
protected void onResume() {
super.onResume();
try {
if (AppConstants.isActivityPaused) {//isActivityPaused is boolean var in AppConstant class
startCamera();
mBinding.frmCameraPreview.startPreview();
AppConstants.isActivityPaused = false;
}
} catch (Exception e) {
e.printStackTrace();
}
}
@Override
protected void onPause() {
AppConstants.isActivityPaused = true;
try {
if (mCamera != null) {//mCamera is Camera object
mCamera.stopPreview();
mCamera.lock();
mCamera.release();
mCamera = null;
}
} catch (Exception e) {
e.printStackTrace();
}
super.onPause();
}
private void startCamera() {
mBinding.frmCameraPreview.requestLayout();
try {
if (mCamera == null)
mCamera = getCameraInstance();
if (mCamera != null) {
//setup camera
}
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* Helper method to access the camera returns null if it cannot get the
* camera or does not exist
*
* @return camera
*/
private Camera getCameraInstance() {
Camera camera = null;
try {
camera = Camera.open();
if (camera == null) {
camera = getFrontFacingCamera();
}
} catch (Exception e) {
e.printStackTrace();
}
return camera;
}
/**
* if there is no back camera we will get front camera instance
*
* @return front camera
*/
private Camera getFrontFacingCamera() {
int cameraCount;
Camera cam = null;
Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
cameraCount = Camera.getNumberOfCameras();
for (int camIdx = 0; camIdx < cameraCount; camIdx++) {
Camera.getCameraInfo(camIdx, cameraInfo);
if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_FRONT) {
cam = Camera.open(camIdx);
}
}
if (cam == null)
cam = Camera.open();
return cam;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/65458544
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