SurfaceView 캡쳐때문에 문의드립니다.

Question

현재 저의 코드는 

 

 @Override
        public void onClick(View v) {
            View captureView = findViewById(R.id.surface_view);
            Bitmap bm = Bitmap.createBitmap(viewToBitmap(captureView));

            if (bm != null) {
                try {

                    String path = Environment.getExternalStorageDirectory().toString();
                    OutputStream fOut = null;
                    File file = new File(path + "/", "screentest.jpg");
                    fOut = new FileOutputStream(file);

                    bm.compress(Bitmap.CompressFormat.JPEG, 100, fOut);
                    fOut.flush();
                    fOut.close();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    });
}
 

        public Bitmap viewToBitmap(View view) {
            Bitmap bitmap = Bitmap.createBitmap(view.getWidth(), view.getHeight(), Bitmap.Config.ARGB_8888);
            Canvas canvas = new Canvas(bitmap);
            if (view instanceof SurfaceView) {
                SurfaceView surfaceView = (SurfaceView) view;
                surfaceView.setZOrderOnTop(true);
                surfaceView.draw(canvas);
                surfaceView.setZOrderOnTop(false);
                return bitmap;
            } else {
                //For ViewGroup & View
                view.draw(canvas);
                return bitmap;
            }
        }

단순히 Surface 에 연결된 동영상의 화면을 캡쳐하려고하는데 위의코드롤 통해 저장을 하면

검은화면만 저장이되네요.. 혹시나 코드에 문제점이있는지 알려주시면 감사하겠습니다.

버튼을 눌렀을때 surfaceView 의 화면이 저장되게 하고싶습니다.