android - 相机的 surfaceview 在 android lollipop os 中不工作

Question

今天我在 android surfaceview for camera customization 中遇到了一个问题。我试过下面的代码。

The Issue occurred when I captured the image, it stops the camera preview and doesn't return to the activity.

下面的代码将在程序中实现。我从 stackoverflow 上的现有引用中获取了这段代码

1. 支持类。

   public class AndroidCameraSurfaceview extends Activity implements
       SurfaceHolder.Callback {
   TextView testView;
   
   Camera camera;
   SurfaceView surfaceView;
   SurfaceHolder surfaceHolder;
   boolean preview;
   
   PictureCallback rawCallback;
   ShutterCallback shutterCallback;
   PictureCallback jpegCallback;
   int displayheight, displaywidth;
   Camera.PreviewCallback previewCallback;
   
   /** Called when the activity is first created. */
   @Override
   public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       requestWindowFeature(Window.FEATURE_NO_TITLE);
       setContentView(R.layout.camerasurfaceview);
   
       getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
       getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
       surfaceView = (SurfaceView) findViewById(R.id.surfaceView);
       surfaceHolder = surfaceView.getHolder();
   
       surfaceHolder.addCallback(this);
   
       surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
   
       jpegCallback = new PictureCallback() {
           public void onPictureTaken(byte[] data, Camera camera) {
               Bundle b = new Bundle();
               b.putByteArray("Image", data);
               Intent intent = new Intent();
               intent.putExtras(b);
               setResult(RESULT_OK, intent);
               finish();
               // refreshCamera();
           }
       };
   }
   
   
   
   public void captureImage(View v) throws IOException {
               // take the picture
               camera.takePicture(null, null, jpegCallback);
           }
   
       public void refreshCamera() {
           if (surfaceHolder.getSurface() == null) {
               // preview surface does not exist
               return;
           }
   
           try {
               camera.stopPreview();
           } catch (Exception e) {
           }
   
           try {
               camera.setDisplayOrientation(90);
               camera.setPreviewDisplay(surfaceHolder);
               camera.startPreview();
           } catch (Exception e) {
   
           }
       }
   
       public void surfaceChanged(SurfaceHolder holder, int format, int width,
               int height) {
           if (preview) {
               camera.stopPreview();
           }
   try{
           Camera.Parameters parameters = camera.getParameters();
           List<Size> sizes = parameters.getSupportedPreviewSizes();
           Size optimalSize = getOptimalPreviewSize(sizes, width, height);
           parameters.setPreviewSize(optimalSize.width, optimalSize.height);
           camera.setParameters(parameters);
           try {
               camera.setDisplayOrientation(90);
               camera.setPreviewDisplay(holder);
               camera.startPreview();
               preview = true;
           } catch (IOException e) {
               e.printStackTrace();
           }
   }catch(Exception e){
       System.out.println("Surface Exception---=>"+e);
   }
       }
   
       public void surfaceCreated(SurfaceHolder holder) {
           camera = Camera.open();
           if (camera != null) {
               Camera.Parameters params = camera.getParameters();
               camera.setDisplayOrientation(90);
               camera.setParameters(params);
   
           }
       }
   
       public void surfaceDestroyed(SurfaceHolder holder) {
           // stop preview and release camera
           camera.stopPreview();
           camera.release();
           camera = null;
       }
   
       private Size getOptimalPreviewSize(List<Size> sizes, int w, int h) {
           final double ASPECT_TOLERANCE = 1;
           double targetRatio = (double) w / h;
           if (sizes == null)
               return null;
           Size optimalSize = null;
           double minDiff = Double.MAX_VALUE;
           int targetHeight = h;
           for (Size size : sizes) {
               double ratio = (double) size.width / size.height;
               if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
                   continue;
               if (Math.abs(size.height - targetHeight) < minDiff) {
                   optimalSize = size;
                   minDiff = Math.abs(size.height - targetHeight);
               }
           }
   
           if (optimalSize == null) {
               minDiff = Double.MAX_VALUE;
               for (Size size : sizes) {
                   if (Math.abs(size.height - targetHeight) < minDiff) {
                       optimalSize = size;
                       minDiff = Math.abs(size.height - targetHeight);
                   }
               }
           }
           return optimalSize;
       }
   
       }
   

   2.在Activity中实现

   public void captureImage() {

       Intent intentDriver = new Intent(AddNewDevice_Activity.this,
               AndroidCameraSurfaceview.class);
       startActivityForResult(intentDriver, 0);
       //
       // Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
       //
       // Uri fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
       //
       // intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
       //
       // // start the image capture Intent
       // startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
   
       // Intent intent = new Intent(MediaStore.ACTION_IMAGE_CAPTURE);
       //
       // fileUri = getOutputMediaFileUri(MEDIA_TYPE_IMAGE);
       //
       // intent.putExtra(MediaStore.EXTRA_OUTPUT, fileUri);
       //
       // // start the image capture Intent
       // startActivityForResult(intent, CAMERA_CAPTURE_IMAGE_REQUEST_CODE);
   
   }
   
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
   
       super.onActivityResult(requestCode, resultCode, data);
   
       if (requestCode == 0) {
   
           System.out.println("Result Code: " + resultCode);
           if (resultCode == RESULT_OK && data != null) {
   
               Bundle bundle = data.getExtras();
               byte[] test = bundle.getByteArray("Image");
               Bitmap bpCamera = BitmapFactory.decodeByteArray(test, 0,
                       test.length);
               Matrix matrix = new Matrix();
               matrix.postRotate(90);
               bpCamera = Bitmap
                       .createBitmap(bpCamera, 0, 0, bpCamera.getWidth(),
                               bpCamera.getHeight(), matrix, true);
   
               imageView_camera.setImageBitmap(bpCamera);
               selectedImageStr = encodeTobase64(bpCamera);
           }
   
       } else {
           finish();
       }
   
   }
   

Answer 1

你应该分开 Activity 和表面 View 。

public class AndroidCameraActivity extends Activity {
    AndroidCameraSurfaceview surfaceView;
    ...
    @Override
    public void onCreate(Bundle savedInstanceState) {
        ...
        surfaceView = (AndroidCameraSurfaceview) findViewById(R.id.surfaceView);
    }
}

class AndroidCameraSurfaceview extends SurfaceView implements SurfaceHolder.Callback {
    public AndroidCameraSurfaceview(Context context, AttributeSet attrs) {
        super(context, attrs);
        getHolder().addCallback(this);
        ...
    }

    public void surfaceCreated(SurfaceHolder holder) {
        ...
    }

    public void surfaceDestroyed(SurfaceHolder holder) {
        ...
    }

    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
        ...
    }
}