在安卓service中啟動相機，安卓service相機

在安卓service中啟動相機，安卓service相機

以前在開發中遇到過一個項目，需要調用手機的拍照，並把照片傳過去。但是拍照時手機不能讓使用者看到相機開啟。

思路是啟動一個service，service中實現一個surfaceview，surfaceview是一個像素的點，這樣就防止了使用者看到相機被開啟。

先看surfaceview的實現：

     

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;    }

等surfaceview建立成功後，調用相機的開啟，相機的開啟是Camera的靜態函數 Camera.open()

開啟camera後，可以設定previe的fps，大小，類型等。

實現如下：

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;}

相機的回調如下：這回調裡，就可以拿到相機的資料，根據需要響應的處理了。

private PreviewCallbackmJpegPreviewCallback=newCamera.PreviewCallback(){

publicvoidonPreviewFrame(byte[]data,Camera camera){

}