android - onPause() 被意外调用

Question

根据我的理解，onPause() 是在另一个 Activity 在它上面弹出时调用的。但在我的例子中，没有发生这样的事情，但是调用了 onPause() 并且 app 崩溃了。想知道为什么会这样吗？

我把整个logcat贴在下面，你可以在里面搜索D/Camera2VideoFragment: onPause: In onPause

我还发布了我认为相关的功能代码块。

暂停

@Override
    public void onPause() {
        if(MyDebug.LOG)
            Log.d(TAG, "onPause: In onPause");
        closeCamera();
        stopBackgroundThread();
        super.onPause();
    }

相机状态改变时的回调状态。

private CameraDevice.StateCallback mStateCallback = new CameraDevice.StateCallback() {
            @Override
            public void onOpened(@NonNull CameraDevice cameraDevice) {
                if(MyDebug.LOG)
                    Log.d(TAG, "onOpened: This is called: " + System.currentTimeMillis());
                mCameraDevice = cameraDevice;
                //start the preview only if there's been no restart or the video is stopped.
                if(NUM_OF_RESTARTS <= 0)
                    startPreview();
                mCameraOpenCloseLock.release();
                if (null != mTextureView) {
                    configureTransform(mTextureView.getWidth(), mTextureView.getHeight());
                }
                //Starts the video again when max file is reached.
                if(MAX_FILE_REACHED)
                    startRecordingVideo();
            }
            @Override
            public void onDisconnected(@NonNull CameraDevice cameraDevice) {
                if(MyDebug.LOG)
                    Log.d(TAG, "onDisconnected: THIS IS CALLED: " + System.currentTimeMillis());
                mCameraOpenCloseLock.release();
                if(MyDebug.LOG)
                    Log.d(TAG, "onDisconnected: cameraDevice.close() is called here: " + System.currentTimeMillis());
                cameraDevice.close();
                mCameraDevice = null;
            }
            @Override
            public void onError(@NonNull CameraDevice cameraDevice, int error) {
                if(MyDebug.LOG)
                    Log.d(TAG, "onError: This is called with error: " + error+ " at: " + System.currentTimeMillis());
                mCameraOpenCloseLock.release();
                if(MyDebug.LOG)
                    Log.d(TAG, "onError: cameraDevice.close() is called here: " + System.currentTimeMillis());
                cameraDevice.close();
                mCameraDevice = null;
                Activity activity = getActivity();
                if (null != activity) {
                    activity.finish();
                }
            }

开始录像

private void startRecordingVideo() {
        final Activity activity = getActivity();
        if (null == activity) {
            return;
        }
        if (null == mCameraDevice || !mTextureView.isAvailable() || null == mPreviewSize) {
            if(MyDebug.LOG){
                if(mCameraDevice == null)
                    Log.d(TAG, "startRecordingVideo: mCameraDevice is NULL: " + System.currentTimeMillis() + Thread.currentThread().toString());
                if(!mTextureView.isAvailable())
                    Log.d(TAG, "startRecordingVideo: mTextureView is not available");
                if(mPreviewSize == null)
                    Log.d(TAG, "startRecordingVideo: mPreviewSize is NULL");
            }
            return;
        }
        try {
            closePreviewSession();
            // Toast.makeText(activity," before setUpMediaRecorder " , Toast.LENGTH_LONG).show();
            setUpMediaRecorder();
            // Toast.makeText(activity," After setUpMediaRecorder " , Toast.LENGTH_LONG).show();

            /**----------------------------------------------------------------------------------------*/
            /**Setting up setOnInfoListener and setOnErrorListener to
             * handle the video if it reaches max file size or if some error arises.
             */
            mMediaRecorder.setOnInfoListener(new MediaRecorder.OnInfoListener() {
                @Override
                public void onInfo(MediaRecorder mr, int what, int extra) {
                    if(MyDebug.LOG)
                        Log.d(TAG, "MediaRecorder onInfo: " + what + " extra: " + extra);
                    final int final_what = what;
                    final int final_extra = extra;
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            if(MyDebug.LOG)
                                Log.d(TAG, "run: calling onVideoInfo here: " + System.currentTimeMillis());
                            onVideoInfo(final_what, final_extra);
                            if(MyDebug.LOG)
                                Log.d(TAG, "run: returned here after onVideoInfo: " + System.currentTimeMillis());
                        }
                    });
                }
            });

            mMediaRecorder.setOnErrorListener(new MediaRecorder.OnErrorListener() {
                @Override
                public void onError(MediaRecorder mr, int what, int extra) {
                    final int final_what = what;
                    final int final_extra  = extra;
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            onVideoError(final_what, final_extra);
                        }
                    });
                }
            });
            /**-----------------------------------------------------------------------------------------*/
            SurfaceTexture texture = mTextureView.getSurfaceTexture();
            assert texture != null;

            // Toast.makeText(activity," setDefaultBufferSize " , Toast.LENGTH_LONG).show();
            texture.setDefaultBufferSize(mPreviewSize.getWidth(), mPreviewSize.getHeight());
            mPreviewBuilder = mCameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_RECORD);
            List<Surface> surfaces = new ArrayList<>();

            // Toast.makeText(activity," before Set up Surface " , Toast.LENGTH_LONG).show();
            // Set up Surface for the camera preview
            Surface previewSurface = new Surface(texture);
            surfaces.add(previewSurface);
            mPreviewBuilder.addTarget(previewSurface);

            // Set up Surface for the MediaRecorder
            Surface recorderSurface = mMediaRecorder.getSurface();
            surfaces.add(recorderSurface);
            mPreviewBuilder.addTarget(recorderSurface);

            // Toast.makeText(activity," After mPreviewBuilder" , Toast.LENGTH_LONG).show();
            // Start a capture session
            // Once the session starts, we can update the UI and start recording
            mCameraDevice.createCaptureSession(surfaces, new CameraCaptureSession.StateCallback() {

                @Override
                public void onConfigured(@NonNull CameraCaptureSession cameraCaptureSession) {
                    mPreviewSession = cameraCaptureSession;
                    // Toast.makeText(activity," before updatePreview" , Toast.LENGTH_LONG).show();
                    updatePreview();
                    // Toast.makeText(activity," After updatePreview" , Toast.LENGTH_LONG).show();
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            // UI
                            mButtonVideo.setText(R.string.stop);
                            mIsRecordingVideo = true;
                            // Start recording
                            if(mMediaRecorder == null) {
                                if(MyDebug.LOG)
                                    Log.d(TAG, "onConfigured, run: mMediaRecorder is somehow null." );
                            }
                            mMediaRecorder.start();
                        }
                    });
                }

                @Override
                public void onConfigureFailed(@NonNull CameraCaptureSession cameraCaptureSession) {
                    Activity activity = getActivity();
                    if (null != activity) {
                        Toast.makeText(activity, "Failed", Toast.LENGTH_SHORT).show();
                    }
                }
            }, mBackgroundHandler);
        } catch (CameraAccessException | IOException e) {
            e.printStackTrace();
        }

    }

LOGCAT

 I/OpenGLRenderer: Initialized EGL, version 1.4
D/OpenGLRenderer: Enabling debug mode 0
I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@2ebe9688 time:2777009
D/ROOT: Root access requested 
D/Camera2VideoFragment: tryAcquire
I/CameraManagerGlobal: getCameraService: Reconnecting to camera service
E/Camera2VideoFragment: Couldn't find any suitable preview size
D/Camera2VideoFragment: openCamera: Intialising New MediaRecorder.
D/Camera2VideoFragment: openCamera: Manager.openCamera called here: 1532504895664
I/CameraManager: Using legacy camera HAL.
D/Camera2VideoFragment: onOpened: This is called: 1532504896165
I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
I/RequestThread-0: Configure outputs: 1 surfaces configured.
D/Camera: app passed NULL surface
I/CameraDeviceState: Legacy camera service transitioning to state IDLE
I/RequestQueue: Repeating capture request set.
W/LegacyRequestMapper: convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
W/LegacyRequestMapper: convertRequestToMetadata - Ignoring android.lens.focusDistance false, only 0.0f is supported
I/CameraDeviceState: Legacy camera service transitioning to state CAPTURING
E/BufferQueueProducer: [unnamed-8823-1] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=6 undequeued=0)
E/BufferQueueProducer: [unnamed-8823-1] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=5 undequeued=1)
D/Camera2VideoFragment: onClick: NUM_OF_RESTARTS click: 0
I/RequestQueue: Repeating capture request cancelled.
I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
I/RequestThread-0: Configure outputs: 2 surfaces configured.
D/Camera: app passed NULL surface
I/CameraDeviceState: Legacy camera service transitioning to state IDLE
I/RequestQueue: Repeating capture request set.
W/LegacyRequestMapper: convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
W/LegacyRequestMapper: convertRequestToMetadata - Ignoring android.lens.focusDistance false, only 0.0f is supported
V/RenderScript: 0xb7cfa0a0 Launching thread(s), CPUs 4
E/BufferQueueProducer: [unnamed-8823-2] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=6 undequeued=0)
I/CameraDeviceState: Legacy camera service transitioning to state CAPTURING
E/BufferQueueProducer: [unnamed-8823-2] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=5 undequeued=1)
D/Camera2VideoFragment: MediaRecorder onInfo: 801 extra: 0
D/Camera2VideoFragment: run: calling onVideoInfo here: 1532504954189
                        onVideoInfo: what: 801 extra: 0
                        onVideoInfo: Thread Name: main
                        onVideoInfo: MAX FILE SIZE APPROACHING
                        onVideoInfo: Calling stopRecordingVideo: 1532504954189
D/Camera2VideoFragment: restartRecordingVideo: Stoping Video From restart: 1532504954193
                        stopRecordingVideo: Stop Video Recording
                        stopRecordingVideo: About to call mMediaRecorder.stop()
W/Adreno-EGLSUB: <DequeueBuffer:736>: dequeue native buffer fail: No such device, buffer=0x0, handle=0x0
W/Adreno-EGL: <qeglDrvAPI_eglSwapBuffers:3709>: EGL_BAD_SURFACE
E/CameraDeviceGLThread-0: Received exception on GL render thread: 
                          java.lang.IllegalStateException: swapBuffers: EGL error: 0x300d
                              at android.hardware.camera2.legacy.SurfaceTextureRenderer.checkEglError(SurfaceTextureRenderer.java:530)
                              at android.hardware.camera2.legacy.SurfaceTextureRenderer.swapBuffers(SurfaceTextureRenderer.java:523)
                              at android.hardware.camera2.legacy.SurfaceTextureRenderer.drawIntoSurfaces(SurfaceTextureRenderer.java:729)
                              at android.hardware.camera2.legacy.GLThreadManager$1.handleMessage(GLThreadManager.java:105)
                              at android.os.Handler.dispatchMessage(Handler.java:98)
                              at android.os.Looper.loop(Looper.java:135)
                              at android.os.HandlerThread.run(HandlerThread.java:61)
I/CameraDeviceState: Legacy camera service transitioning to state ERROR
D/Camera2VideoFragment: stopRecordingVideo: Done mMediaRecorder.stop()
                        stopRecordingVideo: Reset mMediaRecorder
                        stopRecordingVideo: Release mMediaRecorder
D/Camera2VideoFragment: stopRecordingVideo: Closing Camera: 1532504954421
                        closeCamera: mCameraDevice.close() called here.
E/RequestThread-0: Timed out while waiting for request to complete.
W/CaptureCollector: Preview buffers dropped for request: 1
E/CameraDeviceState: Cannot receive result while in state: 0
                     Cannot receive result while in state: 0
E/CameraDeviceState: Cannot receive result while in state: 0
W/MessageQueue: Handler (android.graphics.SurfaceTexture$1) {63c0706} sending message to a Handler on a dead thread
                java.lang.IllegalStateException: Handler (android.graphics.SurfaceTexture$1) {63c0706} sending message to a Handler on a dead thread
                    at android.os.MessageQueue.enqueueMessage(MessageQueue.java:325)
                    at android.os.Handler.enqueueMessage(Handler.java:631)
                    at android.os.Handler.sendMessageAtTime(Handler.java:600)
                    at android.os.Handler.sendMessageDelayed(Handler.java:570)
                    at android.os.Handler.sendEmptyMessageDelayed(Handler.java:534)
                    at android.os.Handler.sendEmptyMessage(Handler.java:519)
                    at android.graphics.SurfaceTexture.postEventFromNative(SurfaceTexture.java:368)
E/BufferQueueProducer: [unnamed-8823-2] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-2] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-2] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-2] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-2] cancelBuffer: BufferQueue has been abandoned
D/Camera2VideoFragment: stopRecordingVideo: Opening Camera: 1532504958414
D/Camera2VideoFragment: tryAcquire
E/Camera2VideoFragment: Couldn't find any suitable preview size
D/Camera2VideoFragment: openCamera: Intialising New MediaRecorder.
                        openCamera: Manager.openCamera called here: 1532504958422
I/CameraManager: Using legacy camera HAL.
D/Camera2VideoFragment: onVideoInfo: came back here after restarting video recording: 1532504958920
                        run: returned here after onVideoInfo: 1532504958920
D/Camera2VideoFragment: onError: This is called with error: 1 at: 1532504958924
                        onError: cameraDevice.close() is called here: 1532504958924
D/Camera2VideoFragment: onClosed: Camera Closed: 1532504958954
D/Camera2VideoFragment: onOpened: This is called: 1532504958991
I/CameraDeviceState: Legacy camera service transitioning to state CONFIGURING
I/RequestThread-0: Configure outputs: 2 surfaces configured.
D/Camera: app passed NULL surface
I/CameraDeviceState: Legacy camera service transitioning to state IDLE
D/Camera2VideoFragment: onPause: In onPause
I/RequestQueue: Repeating capture request set.
W/LegacyRequestMapper: convertRequestMetadata - control.awbRegions setting is not supported, ignoring value
                       convertRequestToMetadata - Ignoring android.lens.focusDistance false, only 0.0f is supported
W/IInputConnectionWrapper: showStatusIcon on inactive InputConnection
E/BufferQueueProducer: [unnamed-8823-3] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=6 undequeued=0)
I/CameraDeviceState: Legacy camera service transitioning to state CAPTURING
E/BufferQueueProducer: [unnamed-8823-0] dequeueBuffer: BufferQueue has been abandoned
W/Adreno-EGLSUB: <DequeueBuffer:736>: dequeue native buffer fail: No such device, buffer=0x0, handle=0x0
W/Adreno-EGL: <qeglDrvAPI_eglSwapBuffers:3709>: EGL_BAD_SURFACE
E/CameraDeviceGLThread-0: Received exception on GL render thread: 
                          java.lang.IllegalStateException: swapBuffers: EGL error: 0x300d
                              at android.hardware.camera2.legacy.SurfaceTextureRenderer.checkEglError(SurfaceTextureRenderer.java:530)
                              at android.hardware.camera2.legacy.SurfaceTextureRenderer.swapBuffers(SurfaceTextureRenderer.java:523)
                              at android.hardware.camera2.legacy.SurfaceTextureRenderer.drawIntoSurfaces(SurfaceTextureRenderer.java:729)
                              at android.hardware.camera2.legacy.GLThreadManager$1.handleMessage(GLThreadManager.java:105)
                              at android.os.Handler.dispatchMessage(Handler.java:98)
                              at android.os.Looper.loop(Looper.java:135)
                              at android.os.HandlerThread.run(HandlerThread.java:61)
I/CameraDeviceState: Legacy camera service transitioning to state ERROR
D/Camera2VideoFragment: onError: This is called with error: 1 at: 1532504959666
D/Camera2VideoFragment: onError: cameraDevice.close() is called here: 1532504959667
E/BufferQueueProducer: [unnamed-8823-3] dequeueBuffer: min undequeued buffer count (2) exceeded (dequeued=5 undequeued=1)
E/RequestThread-0: Timed out while waiting for request to complete.
W/CaptureCollector: Preview buffers dropped for request: 0
E/CameraDeviceState: Cannot receive result while in state: 0
                     Cannot receive result while in state: 0
E/CameraDeviceState: Cannot receive result while in state: 0
E/BufferQueueProducer: [unnamed-8823-3] queueBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-3] dequeueBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-3] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-3] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-3] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-3] cancelBuffer: BufferQueue has been abandoned
E/BufferQueueProducer: [unnamed-8823-3] cancelBuffer: BufferQueue has been abandoned
D/Camera2VideoFragment: onClosed: Camera Closed: 1532504963772
W/CameraCaptureSession: Session 1: The camera device was already closed: 
                        java.lang.IllegalStateException: CameraDevice was already closed
                            at android.hardware.camera2.impl.CameraDeviceImpl.checkIfCameraClosedOrInError(CameraDeviceImpl.java:1482)
                            at android.hardware.camera2.impl.CameraDeviceImpl.stopRepeating(CameraDeviceImpl.java:677)
                            at android.hardware.camera2.impl.CameraCaptureSessionImpl.close(CameraCaptureSessionImpl.java:328)
                            at android.hardware.camera2.impl.CameraCaptureSessionImpl.finalize(CameraCaptureSessionImpl.java:561)
                            at java.lang.Daemons$FinalizerDaemon.doFinalize(Daemons.java:191)
                            at java.lang.Daemons$FinalizerDaemon.run(Daemons.java:174)
                            at java.lang.Thread.run(Thread.java:818)

Answer 1

在我学习 Android 的第一步时，这张图总是帮助我理解生命周期和调用方法的原因

也许这对您也有帮助，您可以找出哪些元素导致您的应用调用 OnPause()