Start the camera in Android service and Android service camera

Start the camera in Android service and Android service camera

I have encountered a project in development before. I need to call a mobile phone to take a photo and upload the photo. However, when taking the photo, the mobile phone cannot let the user see the camera open.

The idea is to start a service and implement a surfaceview in the service. surfaceview is a pixel point, which prevents users from seeing the camera open.

First, let's look at the implementation of surfaceview:

private void makeAndAddSurfaceView() {        SurfaceView dummyView = new SurfaceView(this.mApplication);        SurfaceHolder holder = dummyView.getHolder();        holder.addCallback(this);        holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);        WindowManager wm = (WindowManager)this.mApplication.getSystemService(Context.WINDOW_SERVICE);                WindowManager.LayoutParams params = new WindowManager.LayoutParams(1, 1,                WindowManager.LayoutParams.TYPE_SYSTEM_ALERT,                WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE |                        WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE,                PixelFormat.TRANSPARENT);        params.gravity = Gravity.TOP | Gravity.RIGHT;        params.alpha = PixelFormat.TRANSPARENT;        params.x = params.y = mApplication.getResources().getDimensionPixelOffset(                R.dimen.preview_surface_offset);                wm.addView(dummyView, params);        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {        dummyView.setAlpha(PixelFormat.TRANSPARENT);        }        //dummyView.getBackground().setAlpha(PixelFormat.TRANSPARENT);        mDummySurfaceView = dummyView;    }

After surfaceview is created, the Camera is called to open the Camera. The Camera is opened by the static function Camera. open () of Camera ()

After turning on camera, you can set the fps, size, and type of previe.

The implementation is as follows:

private void startRecorder() throws IOException {// if (checkCameraHardware(this.mApplication)) {if (mCameraId < 0) {findFirstBackFacingCamera();}if (mCamera == null || !isStarted()) {try {mCamera = Camera.open(mCameraId);} catch (RuntimeException exception) {synchronized (cameraLock) {mRecordingState = CameraState.NOT_RECORDING;cameraLock.notifyAll();}return;}}// }if (mCamera == null) {return;// throw new// UnsupportedOperationException("No camera present");}mCamera.setPreviewDisplay(mDummySurfaceHolder);Camera.Parameters params = mCamera.getParameters();List<Size> supportSizes = mCamera.getParameters().getSupportedPictureSizes();int format = params.getPreviewFormat();Size size = params.getPreviewSize();int[] CurPreRange = new int[2];params.getPreviewFpsRange(CurPreRange);params.setPreviewFpsRange(CurPreRange[0], CurPreRange[1]);// params.setPictureFormat(ImageFormat.JPEG);if (isBackCamera && DEFAULT_ORIENTATION != -1) {params.setRotation(DEFAULT_ORIENTATION);} else if (DEFAULT_ORIENTATION != -1) {params.setRotation(360 - DEFAULT_ORIENTATION);}Size targetSize = getTargetPreviewSize(supportSizes);if (targetSize != null) {params.setPictureSize(targetSize.width, targetSize.height);}try {mCamera.setParameters(params);} catch (Exception e) {logger.fine(e.getMessage());}int[] frameRates = new int[2];Log.w(TAG,"Camera properties: bpp=" + ImageFormat.getBitsPerPixel(format)+ "; format=" + format + "; size=" + size.width + "x"+ size.height + "; frameRates=" + frameRates[0] + "-"+ frameRates[1]);mCamera.setPreviewCallback(mJpegPreviewCallback);try {mCamera.startPreview(); // Recording is now started} catch (RuntimeException e) {stopCameraInternal();throw e;}mRecordingState = CameraState.RECORDING;}

The callback of the camera is as follows: In this callback, you can get the camera data and process the response as needed.

Private previewcallbackmcallpreviewcallback = newCamera. PreviewCallback (){

PublicvoidonPreviewFrame (byte [] data, Camera camera ){

}