在Android上收到输入流图片但空白

Question

我正在尝试通过蓝牙发送图像。成功连接设备，选择和发送文件后，它似乎没问题。但接收文件的手机显示文件的名称，但打开时文件似乎是空的。

    private class ConnectedThread extends Thread {
    private final BluetoothSocket mmSocket;
    private final InputStream mmInStream;
    private final OutputStream mmOutStream;

    public ConnectedThread(BluetoothSocket socket) {
        Log.d(TAG, "create ConnectedThread");
        mmSocket = socket;
        InputStream tmpIn = null;
        OutputStream tmpOut = null;

        // Get the BluetoothSocket input and output streams
        try {
            tmpIn = socket.getInputStream();
            tmpOut = socket.getOutputStream();
        } catch (IOException e) {
            Log.e(TAG, "temp sockets not created", e);
        }

        mmInStream = tmpIn;
        mmOutStream = tmpOut;
    }

    public void run() {
        Log.i(TAG, "BEGIN mConnectedThread");

        File pictureFile = getDir();
        Bitmap bitmap = BitmapFactory.decodeStream(mmInStream);

        try {       

            FileOutputStream fos = new FileOutputStream(pictureFile);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 70, fos);
            fos.flush();
            fos.close();

             mHandler.obtainMessage(BluetoothChat.MESSAGE_FILE, -1,
             -1, pictureFile.getAbsolutePath().getBytes())
             .sendToTarget();

        } catch (Exception e) {
            e.printStackTrace();

        }

    }

    private File getDir() {
        File mediaStorageDir = new File(
                Environment
                        .getExternalStoragePublicDirectory(Environment.DIRECTORY_DCIM),
                "Test");
        if (!mediaStorageDir.exists()) {
            if (!mediaStorageDir.mkdirs()) {
                Log.d(TAG, "failed to create directory");
                return null;
            }
        }
        // Create a media file name
        String timeStamp = new SimpleDateFormat("yyyyMMdd_HHmmss")
                .format(new Date());
        File mediaFile;
        mediaFile = new File(mediaStorageDir.getPath() + File.separator
                + "IMG_" + timeStamp + ".jpg");
        Log.d("Gauss", "Saving to: " + mediaFile.getAbsolutePath());
        return mediaFile;
    }

请帮忙吗？