/* Save the buffered data into a JPG image file*/
    private void screenShot(byte[] buf, String shotDir) {
        File dir = new File(shotDir);
        if (!dir.exists() || !dir.isDirectory()) {
            dir.mkdirs();
        }
        YuvImage yuvImage = new YuvImage(buf,
                ImageFormat.NV21,
                DJIVideoStreamDecoder.getInstance().width,
                DJIVideoStreamDecoder.getInstance().height,
                null);
        OutputStream outputFile;
        final String path = dir + "/ScreenShot_" + System.currentTimeMillis() + ".jpg";
        try {
            outputFile = new FileOutputStream(new File(path));
        } catch (FileNotFoundException e) {
            Log.e(TAG, "test screenShot: new bitmap output file error: " + e);
            return;
        }
        if (outputFile != null) {
            yuvImage.compressToJpeg(new Rect(0,
                    0,
                    DJIVideoStreamDecoder.getInstance().width,
                    DJIVideoStreamDecoder.getInstance().height), 100, outputFile);
        }
        try {
            outputFile.close();
        } catch (IOException e) {
            Log.e(TAG, "test screenShot: compress yuv image error: " + e);
            e.printStackTrace();
        }
        runOnUiThread(new Runnable() {
            @Override
            public void run() {
                displayPath(path);
            }
        });
    }

    public void onClick(View v) {
        if (screenShot.isSelected()) {
            screenShot.setText("Screen Shot");
            screenShot.setSelected(false);
            if (useSurface) {
                DJIVideoStreamDecoder.getInstance().changeSurface(videostreamPreviewSh.getSurface());
            }
            savePath.setText("");
            savePath.setVisibility(View.INVISIBLE);
        } else {
            screenShot.setText("Live Stream");
            screenShot.setSelected(true);
            if (useSurface) {
                DJIVideoStreamDecoder.getInstance().changeSurface(null);
            }
            savePath.setText("");
            savePath.setVisibility(View.VISIBLE);
            pathList.clear();
        }
    }

    private void displayPath(String path){
        path = path + "\n\n";
        if(pathList.size() < 6){
            pathList.add(path);
        }else{
            pathList.remove(0);
            pathList.add(path);
        }
        StringBuilder stringBuilder = new StringBuilder();
        for(int i = 0 ;i < pathList.size();i++){
            stringBuilder.append(pathList.get(i));
        }
        savePath.setText(stringBuilder.toString());
    }