android - Camera2 API 和 java.lang.IllegalStateException

我正在创建一个支持已弃用和新相机 API 的应用程序。第一个很有魅力，但我正在努力使用 Camera2 API。在测试阶段，我注意到了奇怪的行为。测试设备为三星 Galaxy S5 安卓 6.0.1
当我按下电源/结束键然后返回应用程序时，这就是我得到的(不是每次都发生):

03-12 16:14:32.704 24117-24117/pl.tripper.tripper E/MainActivity: onPause
03-12 16:14:32.774 24117-24128/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-24117-2] dequeueBuffer: BufferQueue has been abandoned
03-12 16:14:32.784 24117-24145/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-24117-2] queueBuffer: BufferQueue has been abandoned
03-12 16:14:33.044 24117-24128/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-24117-2] cancelBuffer: BufferQueue has been abandoned
03-12 16:14:33.044 24117-24145/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-24117-2] cancelBuffer: BufferQueue has been abandoned
03-12 16:14:33.054 24117-24129/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-24117-2] cancelBuffer: BufferQueue has been abandoned
03-12 16:14:33.054 24117-24128/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-24117-2] cancelBuffer: BufferQueue has been abandoned
03-12 16:14:33.264 24117-24117/pl.tripper.tripper E/CameraNewApi: cameraComponentsReleased
03-12 16:14:33.264 24117-24117/pl.tripper.tripper E/CameraNewApi: StopCameraThread
03-12 16:14:33.264 24117-24117/pl.tripper.tripper E/CameraApiManager: cameraPreviewRemoved
03-12 16:14:33.264 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceDestroyed
03-12 16:14:33.634 24117-24117/pl.tripper.tripper E/MainActivity: onCreate
03-12 16:14:33.634 24117-24117/pl.tripper.tripper E/MainActivity: onResume
03-12 16:14:33.634 24117-24117/pl.tripper.tripper E/CameraNewApi: startCameraThread
03-12 16:14:33.634 24117-24117/pl.tripper.tripper E/CameraApiManager: cameraPreviewCreated
03-12 16:14:33.644 24117-24117/pl.tripper.tripper E/CameraNewApi: initCamera
03-12 16:14:33.674 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceCreated
03-12 16:14:33.674 24117-24117/pl.tripper.tripper E/CameraNewApi: openCamera
03-12 16:14:33.914 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceChanged
03-12 16:14:33.914 24117-25053/pl.tripper.tripper E/CameraNewApi: onOpened
03-12 16:14:33.914 24117-25053/pl.tripper.tripper E/CameraNewApi: createCameraPreview
03-12 16:14:33.934 24117-24117/pl.tripper.tripper E/MainActivity: onPause
03-12 16:14:34.174 24117-24117/pl.tripper.tripper E/CameraNewApi: cameraComponentsReleased
03-12 16:14:34.174 24117-25053/pl.tripper.tripper E/CameraNewApi: onConfigured
03-12 16:14:34.174 24117-24117/pl.tripper.tripper E/CameraNewApi: StopCameraThread
03-12 16:14:34.174 24117-24117/pl.tripper.tripper E/CameraApiManager: cameraPreviewRemoved
03-12 16:14:34.184 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceDestroyed
03-12 16:14:34.914 24117-24117/pl.tripper.tripper E/MainActivity: onResume
03-12 16:14:34.914 24117-24117/pl.tripper.tripper E/CameraNewApi: startCameraThread
03-12 16:14:34.924 24117-24117/pl.tripper.tripper E/CameraApiManager: cameraPreviewCreated
03-12 16:14:34.924 24117-24117/pl.tripper.tripper E/CameraNewApi: initCamera
03-12 16:14:34.964 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceCreated
03-12 16:14:34.964 24117-24117/pl.tripper.tripper E/CameraNewApi: openCamera
03-12 16:14:35.294 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceChanged
03-12 16:14:35.294 24117-25121/pl.tripper.tripper E/CameraNewApi: onOpened
03-12 16:14:35.294 24117-25121/pl.tripper.tripper E/CameraNewApi: createCameraPreview
03-12 16:14:35.354 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceChanged
03-12 16:14:35.374 24117-24117/pl.tripper.tripper E/MainActivity: onPause
03-12 16:14:35.384 24117-25121/pl.tripper.tripper E/CameraNewApi: onConfigured
03-12 16:14:35.594 24117-24117/pl.tripper.tripper E/CameraNewApi: cameraComponentsReleased
03-12 16:14:35.594 24117-25121/pl.tripper.tripper E/CameraNewApi: Session was closed or camera device has been closed.
                                                                  java.lang.IllegalStateException: CameraDevice was already closed
                                                                      at android.hardware.camera2.impl.CameraDeviceImpl.checkIfCameraClosedOrInError(CameraDeviceImpl.java:1997)
                                                                      at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:844)
                                                                      at android.hardware.camera2.impl.CameraDeviceImpl.setRepeatingRequest(CameraDeviceImpl.java:899)
                                                                      at android.hardware.camera2.impl.CameraCaptureSessionImpl.setRepeatingRequest(CameraCaptureSessionImpl.java:236)
                                                                      at pl.tripper.tripper.camera.CameraNewApi$2.onConfigured(CameraNewApi.java:107)
                                                                      at java.lang.reflect.Method.invoke(Native Method)
                                                                      at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)
                                                                      at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)
                                                                      at android.os.Handler.handleCallback(Handler.java:739)
                                                                      at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                      at android.os.Looper.loop(Looper.java:158)
                                                                      at android.os.HandlerThread.run(HandlerThread.java:61)
03-12 16:14:35.594 24117-24117/pl.tripper.tripper E/CameraNewApi: StopCameraThread
03-12 16:14:35.594 24117-25121/pl.tripper.tripper E/CameraNewApi: cameraComponentsReleased
03-12 16:14:35.594 24117-24117/pl.tripper.tripper E/CameraApiManager: cameraPreviewRemoved
03-12 16:14:35.604 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceDestroyed
03-12 16:14:35.644 24117-24117/pl.tripper.tripper E/MainActivity: onCreate
03-12 16:14:35.654 24117-24117/pl.tripper.tripper E/MainActivity: onResume
03-12 16:14:35.654 24117-24117/pl.tripper.tripper E/CameraNewApi: startCameraThread
03-12 16:14:35.654 24117-24117/pl.tripper.tripper E/CameraApiManager: cameraPreviewCreated
03-12 16:14:35.654 24117-24117/pl.tripper.tripper E/CameraNewApi: initCamera
03-12 16:14:35.694 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceCreated
03-12 16:14:35.694 24117-24117/pl.tripper.tripper E/CameraNewApi: openCamera
03-12 16:14:35.934 24117-24117/pl.tripper.tripper E/CameraNewApi: onSurfaceChanged
03-12 16:14:35.934 24117-25184/pl.tripper.tripper E/CameraNewApi: onOpened
03-12 16:14:35.934 24117-25184/pl.tripper.tripper E/CameraNewApi: createCameraPreview
03-12 16:14:35.944 24117-24117/pl.tripper.tripper E/ViewRootImpl: sendUserActionEvent() mView == null
03-12 16:14:35.944 24117-24117/pl.tripper.tripper E/ViewRootImpl: sendUserActionEvent() mView == null
03-12 16:14:35.994 24117-25184/pl.tripper.tripper E/CameraNewApi: onConfigured

调用方法时添加了一些错误日志。我知道当 session 仍然存在时，cameraDevice 为空，但我不知道如何修复它。 java.lang.IllegalStateException 错误发生后，相机继续工作。第二个问题是 BufferQueueProducer 错误，但我不知道这是从哪里来的。

03-12 15:47:40.244 30720-30731/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-30720-1] dequeueBuffer: BufferQueue has been abandoned
03-12 15:47:40.244 30720-30751/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-30720-1] queueBuffer: BufferQueue has been abandoned
03-12 15:47:40.524 30720-30731/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-30720-1] cancelBuffer: BufferQueue has been abandoned
03-12 15:47:40.524 30720-30751/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-30720-1] cancelBuffer: BufferQueue has been abandoned
03-12 15:47:40.524 30720-30732/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-30720-1] cancelBuffer: BufferQueue has been abandoned
03-12 15:47:40.524 30720-30731/pl.tripper.tripper E/BufferQueueProducer: [SurfaceTexture-1-30720-1] cancelBuffer: BufferQueue has been abandoned

这是我的代码:

主Activity.class

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);

        Log.e(TAG, "onCreate");
        isImmersiveAvailable();
        cameraApiManager = new CameraApiManager(this, this);
    }

    @Override
    protected void onResume() {
        super.onResume();

        Log.e(TAG, "onResume");
       cameraApiManager.createCamera();

    }

    @Override
    protected void onPause() {
        super.onPause();

        Log.e(TAG, "onPause");
        cameraApiManager.releaseCameraAndPreview();
    }

CameraApiManager.class

public class CameraApiManager implements CameraUtility.cameraOpenedListener {

    private static final String TAG = "CameraApiManager";

    private final WeakReference<MainActivity> mainActivity;
    private Context context;

    private CameraSourceApi cameraSourceApi;
    private CameraPreview cameraPreview;

    public CameraApiManager(Context context, MainActivity mainActivity){

        this.mainActivity= new WeakReference<>(mainActivity);

        cameraSourceApi = new CameraSourceApi<>(new CameraNewApi(context));
        this.context = context;
    }

    private boolean cameraProgressBarEnable(){
        return context.getResources().getBoolean(R.bool.camera_progress_bar_enable);
    }

    private void setCameraProgressBarVisibility(final int visibility ){
        final MainActivity mainActivity = this.mainActivity.get();
        if(mainActivity!= null){
            // UI/Main Thread
            if(Looper.myLooper() == Looper.getMainLooper()){
                ProgressBar cameraProgressBar = (ProgressBar) mainActivity.findViewById(R.id.camera_progress_bar);
                cameraProgressBar.setVisibility(visibility);
            } else {
                mainActivity.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        ProgressBar cameraProgressBar = (ProgressBar) mainActivity.findViewById(R.id.camera_progress_bar);
                        cameraProgressBar.setVisibility(visibility);
                    }
                });
            }
        }
    }

    private void showCameraOpenErrorToast(){
        Toast.makeText(context, context.getResources().getString(R.string.camera_open_error_toast), Toast.LENGTH_LONG).show();
    }

    private boolean cameraPermissionGranted() {
        return ContextCompat.checkSelfPermission(context, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED;
    }

    public void createCamera(){
        if(cameraPermissionGranted()){
            if(cameraProgressBarEnable()){
                setCameraProgressBarVisibility(View.VISIBLE);
            }
            cameraSourceApi.createCamera(this);
        }
    }

    public void releaseCameraAndPreview(){
        if(cameraPermissionGranted()){
            cameraSourceApi.releaseCamera();
            removeCameraPreview();
        }
    }

    @Override
    public void onCameraOpened(boolean succeeded, boolean addPreview, boolean progressBar) {
         if(addPreview) {
             if (cameraPreview == null) {
                 Log.e(TAG, "cameraPreviewCreated");
                 cameraPreview = new CameraPreview(context, cameraSourceApi);
                 addCameraPreview();
             }
         }
         if(!progressBar){
             if(cameraProgressBarEnable()){
                 setCameraProgressBarVisibility(View.GONE);
             }
         }
         if(!succeeded){
             showCameraOpenErrorToast();
         }
    }

    private void addCameraPreview(){
        MainActivity mainActivity = this.mainActivity.get();
        if(mainActivity != null && cameraPreview != null){
            FrameLayout preview = (FrameLayout) mainActivity.findViewById(R.id.camera_preview);
            preview.addView(cameraPreview);
        }
    }

    private void removeCameraPreview(){
        MainActivity mainActivity = this.mainActivity.get();
        if(mainActivity!= null && cameraPreview != null){
            Log.e(TAG, "cameraPreviewRemoved");
            FrameLayout preview = (FrameLayout) mainActivity.findViewById(R.id.camera_preview);
            preview.removeView(cameraPreview);
            cameraPreview = null;
        }
    }

     class CameraSourceApi<T extends CameraUtility> implements CameraUtility{

        private T camera;

        CameraSourceApi(T camera){
            this.camera = camera;
        }

        @Override
        public void createCamera(CameraUtility.cameraOpenedListener cameraOpenedListener) {
            camera.createCamera(cameraOpenedListener);
        }

        @Override
        public void releaseCamera() {
            camera.releaseCamera();
        }

        @Override
        public void onSurfaceCreated(SurfaceHolder surfaceHolder) {
            camera.onSurfaceCreated(surfaceHolder);
        }

        @Override
        public void onSurfaceChanged(SurfaceHolder surfaceHolder, int width, int height) {
            camera.onSurfaceChanged(surfaceHolder, width, height);
        }

         @Override
         public void onSurfaceDestroyed(SurfaceHolder surfaceHolder) {
             camera.onSurfaceDestroyed(surfaceHolder);
         }
     }
}

CameraNewApi.class

@TargetApi(21)
class CameraNewApi implements CameraUtility {

    private static final String TAG = "CameraNewApi";

    private Semaphore cameraOpenCloseLock = new Semaphore(1);

    private CameraUtility.cameraOpenedListener cameraOpenedListener;

    private Context context;

    private Handler backgroundHandler;
    private HandlerThread backgroundThread;

    private SurfaceHolder surfaceHolder;

    private String backFacingCameraId;
    private CaptureRequest.Builder captureRequestBuilder;
    private CameraDevice cameraDevice;
    private CameraCaptureSession cameraCaptureSessions;

    CameraNewApi(Context context){
        this.context = context;
    }


    private final CameraDevice.StateCallback cameraDeviceStateCallback = new CameraDevice.StateCallback() {
        @Override
        public void onOpened(@NonNull CameraDevice camera) {
            Log.e(TAG, "onOpened");
            cameraOpenCloseLock.release();
            cameraDevice = camera;
            if(surfaceHolder != null){
                createCameraPreview();
            } else {
                releaseCameraComponents();
            }
        }

        @Override
        public void onDisconnected(@NonNull CameraDevice camera) {
            Log.d(TAG, "deviceCallback.onDisconnected() start");
            Log.e(TAG, "onDisconnected");
            if(cameraOpenedListener != null) {
                cameraOpenedListener.onCameraOpened(false, false, false);
            }
            cameraOpenCloseLock.release();
            camera.close();
            cameraDevice = null;
        }

        @Override
        public void onError(@NonNull CameraDevice camera, int error) {
            Log.e(TAG, "onError");
            Log.d(TAG, "deviceCallback.onError() start");
            if(cameraOpenedListener != null) {
                cameraOpenedListener.onCameraOpened(false, false, false);
            }
            cameraOpenCloseLock.release();
            camera.close();
            cameraDevice = null;
        }
    };

    private final CameraCaptureSession.StateCallback captureSessionStateCallback = new CameraCaptureSession.StateCallback() {
        @Override
        public void onConfigured(@NonNull CameraCaptureSession session) {
            Log.e(TAG, "onConfigured");
            if(cameraDevice != null){
                cameraCaptureSessions = session;
                captureRequestBuilder.set(CaptureRequest.CONTROL_MODE, CameraMetadata.CONTROL_MODE_AUTO);
                try {
                    if(cameraOpenedListener != null) {
                        cameraOpenedListener.onCameraOpened(true, false, false);
                    }
                    session.setRepeatingRequest(captureRequestBuilder.build(), null, backgroundHandler);
                } catch (CameraAccessException e) {
                    Log.e(TAG, "Camera has been disconnected", e);
                } catch (IllegalStateException e){
                    Log.e(TAG, "Session was closed or camera device has been closed. ", e);
                    releaseCameraComponents();
                }
            }
        }

        @Override
        public void onConfigureFailed(@NonNull CameraCaptureSession session) {
            Log.d(TAG, "Capture session configure failed: " + session);
            Log.e(TAG, "onConfigureFailed");
        }
    };

    @Override
    public void createCamera(CameraUtility.cameraOpenedListener cameraOpenedListener) {
        this.cameraOpenedListener = cameraOpenedListener;

        startBackgroundThread();
        if(cameraOpenedListener != null){
            cameraOpenedListener.onCameraOpened(true, true, true);
        }
        initCamera();
    }

    private void releaseCameraComponents(){
        try{
            cameraOpenCloseLock.acquire();
            if(cameraCaptureSessions != null){
                cameraCaptureSessions.close();
                cameraCaptureSessions = null;
            }
            if(cameraDevice != null){
                cameraDevice.close();
                cameraDevice = null;
            }
            if(surfaceHolder != null){
                surfaceHolder = null;
            }
            if(cameraOpenedListener != null){
                cameraOpenedListener = null;
            }
            Log.e(TAG, "cameraComponentsReleased");
        } catch (InterruptedException e) {
            throw new RuntimeException("Interrupted while trying to lock camera closing.", e);
        } finally {
            cameraOpenCloseLock.release();
        }
    }
    @Override
    public void releaseCamera() {
        releaseCameraComponents();
        stopBackgroundThread();
    }

    @Override
    public void onSurfaceCreated(SurfaceHolder surfaceHolder) {
        Log.e(TAG, "onSurfaceCreated");
        this.surfaceHolder = surfaceHolder;
        openCamera();
    }

    @Override
    public void onSurfaceChanged(SurfaceHolder surfaceHolder, int width, int height) {
        Log.e(TAG, "onSurfaceChanged");
        setSurfaceSize(width, height);
    }

    @Override
    public void onSurfaceDestroyed(SurfaceHolder surfaceHolder) {
        Log.e(TAG, "onSurfaceDestroyed");
    }

    private void startBackgroundThread() {
        Log.e(TAG, "startCameraThread");
        backgroundThread = new HandlerThread("CameraBackground");
        backgroundThread.start();
        backgroundHandler = new Handler(backgroundThread.getLooper());
    }

    private void stopBackgroundThread() {
        Log.e(TAG, "StopCameraThread");
        backgroundThread.quitSafely();
        try {
            backgroundThread.join();
            backgroundThread = null;
            backgroundHandler = null;
        } catch (InterruptedException e) {
            Log.e(TAG, "Error message: ", e);
        }
    }

    private void initCamera(){
        Log.e(TAG, "initCamera");
        CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);

        try{
            for (String cameraId : cameraManager.getCameraIdList()) {
                CameraCharacteristics characteristics
                        = cameraManager.getCameraCharacteristics(cameraId);

                // Use back camera
                Integer facing = characteristics.get(CameraCharacteristics.LENS_FACING);
                if (facing != null && facing == CameraCharacteristics.LENS_FACING_BACK) {
                    backFacingCameraId = cameraId;
                    break;
                }
            }
            if(backFacingCameraId == null){
                Log.d(TAG, "Could not detect a camera");
            }
        } catch (CameraAccessException e) {
            Log.e(TAG, "Could not get camera list", e);
        }
    }

    private void openCamera(){
        Log.e(TAG, "openCamera");
        CameraManager cameraManager = (CameraManager) context.getSystemService(Context.CAMERA_SERVICE);
        try{
            if(backFacingCameraId != null && cameraDevice == null){
                try{
                    if (!cameraOpenCloseLock.tryAcquire(2500, TimeUnit.MILLISECONDS)) {
                        throw new RuntimeException("Time out waiting to lock camera opening.");
                    }
                    cameraManager.openCamera(backFacingCameraId, cameraDeviceStateCallback, backgroundHandler);
                } catch (InterruptedException e) {
                    throw new RuntimeException("Interrupted while trying to lock camera opening.", e);
                }
            }
        } catch(SecurityException e){
            Log.e(TAG, "Camera permission is not granted", e);
        } catch(CameraAccessException e){
            Log.e(TAG, "Could not open camera", e);
        }
    }

    private void createCameraPreview(){

        Log.e(TAG, "createCameraPreview");
        Surface surface = surfaceHolder.getSurface();

        List<Surface> surfaceList = Collections.singletonList(surface);

        try {
            captureRequestBuilder = cameraDevice.createCaptureRequest(CameraDevice.TEMPLATE_PREVIEW);
            captureRequestBuilder.addTarget(surface);
            cameraDevice.createCaptureSession(surfaceList, captureSessionStateCallback, null);
        } catch (CameraAccessException e){
            Log.e(TAG, "Could not create capture session for camera: " + cameraDevice.getId(), e);
        } catch (IllegalStateException e){
            Log.e(TAG, "Camera has been closed", e);
        }
    }

CameraUtility.interface

interface CameraUtility {

    void createCamera(CameraUtility.cameraOpenedListener cameraOpenedListener);
    void releaseCamera();
    void onSurfaceCreated(SurfaceHolder surfaceHolder);
    void onSurfaceChanged(SurfaceHolder surfaceHolder, int width, int height);
    void onSurfaceDestroyed(SurfaceHolder surfaceHolder);

    interface cameraOpenedListener{
        void onCameraOpened(boolean succeeded, boolean addPreview, boolean progressBar);
    }
}

更新

这就是为什么它不会每次都发生。调用 onPause 后立即发生错误， session 开始重复请求以保持预览(onConfigured)。然后 cameraComponentsReleased 在所有清理完成的地方触发，包括当前的 CameraDevice 对象。仍然不知道如何处理这种情况。

03-13 12:12:24.375 17555-17555/pl.tripper.tripper E/MainActivity: onPause
03-13 12:12:24.395 17555-20454/pl.tripper.tripper E/CameraNewApi: onConfigured
03-13 12:12:24.625 17555-17555/pl.tripper.tripper E/CameraNewApi: cameraComponentsReleased
03-13 12:12:24.625 17555-17555/pl.tripper.tripper E/CameraNewApi: StopCameraThread
03-13 12:12:24.625 17555-20454/pl.tripper.tripper E/CameraNewApi: Session was closed or camera device has been closed.
                                                                  java.lang.IllegalStateException: CameraDevice was already closed
                                                                      at android.hardware.camera2.impl.CameraDeviceImpl.checkIfCameraClosedOrInError(CameraDeviceImpl.java:1997)
                                                                      at android.hardware.camera2.impl.CameraDeviceImpl.submitCaptureRequest(CameraDeviceImpl.java:844)
                                                                      at android.hardware.camera2.impl.CameraDeviceImpl.setRepeatingRequest(CameraDeviceImpl.java:899)
                                                                      at android.hardware.camera2.impl.CameraCaptureSessionImpl.setRepeatingRequest(CameraCaptureSessionImpl.java:236)
                                                                      at pl.tripper.tripper.camera.CameraNewApi$2.onConfigured(CameraNewApi.java:114)
                                                                      at java.lang.reflect.Method.invoke(Native Method)
                                                                      at android.hardware.camera2.dispatch.InvokeDispatcher.dispatch(InvokeDispatcher.java:39)
                                                                      at android.hardware.camera2.dispatch.HandlerDispatcher$1.run(HandlerDispatcher.java:65)
                                                                      at android.os.Handler.handleCallback(Handler.java:739)
                                                                      at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                      at android.os.Looper.loop(Looper.java:158)
                                                                      at android.os.HandlerThread.run(HandlerThread.java:61)
03-13 12:12:24.625 17555-20454/pl.tripper.tripper E/CameraNewApi: Camera onClosed
03-13 12:12:24.625 17555-17555/pl.tripper.tripper E/CameraApiManager: cameraPreviewRemoved

最佳答案

java.lang.IllegalStateException: CameraDevice was already closed

这意味着 CameraDevice 在某些情况下被某人关闭。 (例如:内存不足)要处理此问题，您可以在 StateCallback - cameraDeviceStateCallback 中添加 onClosed() 回调。

android.hardware.camera2.CameraDevice.StateCallback.onClosed(CameraDevice)

更新:

它看起来像一个竞争条件。在日志中，17555-17555 releaseCameraComponents 和 17555-20454 onConfigured 回调在不同的线程上被调用。 IMO，cameraCaptureSessions 应该在 releaseCameraComponents 和 onConfigured 中同步。

private void releaseCameraComponents(){
     synchronized(lock) {
          ....
     }
}
....

@Override
public void onConfigured(@NonNull CameraCaptureSession session) {
    synchronized(lock) {
        ....
    }
}

关于android - Camera2 API 和 java.lang.IllegalStateException，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/42749056/