尝试创建生命周期被破坏的LifecycleCamera

Question

我正在尝试为我的屏幕录像机应用程序制作浮动相机视图。

FloatingViewService.java

public class FloatingViewService extends LifecycleService implements CameraXConfig.Provider, LifecycleOwner {
    private View mFloatingView;
    private WindowManager mWindowManager;
    PreviewView previewView;
    private ListenableFuture<ProcessCameraProvider> cameraProviderFuture;

    public FloatingViewService() {
    }


    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        super.onBind(intent);
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        mFloatingView = LayoutInflater.from(this).inflate(R.layout.layout_floating_widget, null);
        final WindowManager.LayoutParams params;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            params = new WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_APPLICATION_OVERLAY,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT);

        } else {
            params = new WindowManager.LayoutParams(
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.WRAP_CONTENT,
                    WindowManager.LayoutParams.TYPE_PHONE,
                    WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE,
                    PixelFormat.TRANSLUCENT);

        }
        params.width = 400;
        params.height = 300;
        mWindowManager = (WindowManager) getSystemService(WINDOW_SERVICE);
        mWindowManager.addView(mFloatingView, params);


        mFloatingView.findViewById(R.id.previewFrame).setOnTouchListener(new View.OnTouchListener() {
            private int initialX;
            private int initialY;
            private float initialTouchX;
            private float initialTouchY;

            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:
                        initialX = params.x;
                        initialY = params.y;
                        initialTouchX = event.getRawX();
                        initialTouchY = event.getRawY();
                        return true;

                    case MotionEvent.ACTION_UP:
                        return true;

                    case MotionEvent.ACTION_MOVE:
                        //this code is helping the widget to move around the screen with fingers
                        params.x = initialX + (int) (event.getRawX() - initialTouchX);
                        params.y = initialY + (int) (event.getRawY() - initialTouchY);
                        mWindowManager.updateViewLayout(mFloatingView, params);
                        return true;
                }
                return false;
            }
        });

        cameraFun(mFloatingView);


    }

    public void cameraFun(View mFloatingView) {
        previewView = mFloatingView.findViewById(R.id.previewFrame);
        cameraProviderFuture = ProcessCameraProvider.getInstance(this);
        cameraProviderFuture.addListener(() -> {
            try {
                ProcessCameraProvider cameraProvider = cameraProviderFuture.get();
                bindPreview(cameraProvider);
            } catch (ExecutionException | InterruptedException e) {
            }
        }, ContextCompat.getMainExecutor(this));
    }

    void bindPreview(@NonNull ProcessCameraProvider cameraProvider) {
        Preview preview = new Preview.Builder()
                .build();

        CameraSelector cameraSelector = new CameraSelector.Builder()
                .requireLensFacing(CameraSelector.LENS_FACING_FRONT)
                .build();
        preview.setSurfaceProvider(previewView.createSurfaceProvider());
        OrientationEventListener orientationEventListener = new OrientationEventListener(this) {
            @Override
            public void onOrientationChanged(int orientation) {
                int rotation;
                int orientationcheck = getResources().getConfiguration().orientation;

                if (orientationcheck == Configuration.ORIENTATION_PORTRAIT) {
                    if (orientation >= 45 && orientation < 135) {
                        rotation = 360;
                    } else if (orientation >= 135 && orientation < 225) {
                        rotation = 180;
                    } else if (orientation >= 225 && orientation < 315) {
                        rotation = 360;
                    } else {
                        rotation = 0;
                    }
                    Log.i("orientation", String.valueOf(orientation) + "= ORIENTATION_PORTRAIT" + orientationcheck);

                } else {
                    if (orientation >= 45 && orientation < 135) {
                        rotation = 90;
                    } else if (orientation >= 135 && orientation < 225) {
                        rotation = 180;
                    } else if (orientation >= 225 && orientation < 315) {
                        rotation = 270;
                    } else {
                        rotation = 0;
                    }
                    Log.i("orientation", String.valueOf(orientation) + "= ORIENTATION_Land" + orientationcheck);
                }
                Log.i("orientation", String.valueOf(orientation) + "= " + orientationcheck);

                previewView.setRotation(rotation);
            }
        };
        orientationEventListener.enable();
        cameraProvider.bindToLifecycle(this, cameraSelector, preview);
    }

    @NonNull
    @Override
    public CameraXConfig getCameraXConfig() {
        return Camera2Config.defaultConfig();
    }

    public void onDestroy() {
        super.onDestroy();
        mWindowManager.removeView(mFloatingView);
    }
}

layout_floating_widget.xml

<?xml version="1.0" encoding="utf-8"?>
<androidx.camera.view.PreviewView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/previewFrame"
    android:layout_width="300dp"
    android:layout_height="250dp"
    android:layout_alignParentStart="true"
    android:layout_alignParentTop="true"
    android:layout_alignParentEnd="true"
    android:layout_alignParentBottom="true"
    android:layout_gravity="center" />

BackgroundService.java 检查下面的代码我如何调用FloatingViewService.java

public class BackgroundService extends Service {
    Boolean onoff = true;

    @Nullable
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }

    public void onCreate() {
        super.onCreate();
        new FloatingViewService();
        if (onoff) {
            onoff = false;
            startService(new Intent(this, FloatingViewService.class));
        } else {
            onoff = true;
            stopService(new Intent(this, FloatingViewService.class));
        }
    }
}

错误：

 java.lang.IllegalArgumentException: Trying to create LifecycleCamera with destroyed lifecycle.
        at androidx.camera.lifecycle.LifecycleCameraRepository.createLifecycleCamera(LifecycleCameraRepository.java:103)
        at androidx.camera.lifecycle.ProcessCameraProvider.bindToLifecycle(ProcessCameraProvider.java:414)
        at androidx.camera.lifecycle.ProcessCameraProvider.bindToLifecycle(ProcessCameraProvider.java:275)
        at com.rdbrain.FloatingViewService.bindPreview(FloatingViewService.java:196)
        at com.rdbrain.FloatingViewService.lambda$cameraFun$0$FloatingViewService(FloatingViewService.java:138)
        at com.rdbrain.-$$Lambda$FloatingViewService$qkM-fNI79D-TvnilmrNFZjQYwlI.run(Unknown Source:2)
        at android.os.Handler.handleCallback(Handler.java:790)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6626)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:438)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:811)

注意：此代码作为单独的模块工作，但是当我连接到屏幕录像机时它不起作用，我已在manifests.xml中设置了所有必要的权限和服务

Answer 1

在 cameraProvider.bindToLifecycle(this, cameraSelector, preview); 中使用 viewLifecycleOwner

 代替 

this

Answer 2

我发现添加了支票

if (getLifecycle().getCurrentState() != Lifecycle.State.DESTROYED) {}

在尝试bindToLifecycle()之前有帮助。