Android 无预览拍照功能

 public void onTakePhotoClicked() { final SurfaceView preview = new SurfaceView(this); SurfaceHolder holder = preview.getHolder(); // deprecated setting, but required on Android versions prior to 3.0 holder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS); holder.addCallback(new SurfaceHolder.Callback() { @Override //The preview must happen at or after this point or takePicture fails public void surfaceCreated(SurfaceHolder holder) { Log.d(TAG, "Surface created"); camera = null; try { camera = Camera.open(Camera.CameraInfo.CAMERA_FACING_BACK); Log.d(TAG, "Opened camera"); try { camera.setPreviewDisplay(holder); } catch (IOException e) { throw new RuntimeException(e); } camera.startPreview(); Log.d(TAG, "Started preview"); //延时拍照 ThreadUtils.postOnUiThreadDelayed(new Runnable() { @Override public void run() { Log.e("zgj","开始拍照"); camera.takePicture(null, null, CameraService.this); } },5000); } catch (Exception e) { if (camera != null) camera.release(); throw new RuntimeException(e); } } @Override public void surfaceDestroyed(SurfaceHolder holder) {} @Override public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {} }); WindowManager wm = (WindowManager)getSystemService(Context.WINDOW_SERVICE); WindowManager.LayoutParams params = new WindowManager.LayoutParams( 1, 1, //Must be at least 1x1 WindowManager.LayoutParams.TYPE_SYSTEM_OVERLAY, 0, //Don't know if this is a safe default PixelFormat.UNKNOWN); //Don't set the preview visibility to GONE or INVISIBLE wm.addView(preview, params); } @Override public void onPictureTaken(byte[] bytes, Camera camera) { Log.e("zgj", "拍照结束"); File pictureDir = Environment.getExternalStorageDirectory(); if (pictureDir == null) { Log.d("zgj", "Error creating media file, check storage permissions!"); return; } try { String pictureName = "ssss.png-600"; File file = new File(pictureDir + "/pic/"); if (!file.exists()) { file.mkdir(); } file = new File(pictureDir + "/pic/" + pictureName); FileOutputStream fos = new FileOutputStream(file); fos.write(bytes); fos.close(); } catch (FileNotFoundException e) { Log.d("zgj", "File not found: " + e.getMessage()); } catch (IOException e) { Log.d("zgj", "Error accessing file: " + e.getMessage()); } }