Bitmap bitmapImage = drawView.getBitmap();
        byte[] byteArray = getByteArray(bitmapImage);
        byteArrayLength = byteArray.length;

        MainWifiActivity.SendReceive host = MainWifiActivity.sendReceiveHost;
        if (host != null) {
            host.write(byteArray);
        }

public class SendReceive extends Thread {
    private Socket socket;
    private InputStream inputStream;
    private OutputStream outputStream;

    public SendReceive(Socket s) {
        socket = s;
        try {
            inputStream = s.getInputStream();
            outputStream = s.getOutputStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    @Override
    public void run() {

        byte[] buffer = new byte[1024];
        int bytes;
        int filesize;

        while (socket != null) {
            try {
                filesize = DrawingActivity.byteArrayLength;
                if(buffer.length != filesize && filesize > 0){
                    buffer = new byte[filesize];
                }
                bytes = inputStream.read(buffer,0 ,buffer.length);

                if (bytes > 0) {
                        Message mesg = handler.obtainMessage(IMAGE_MSG, bytes, -1, buffer);
                        mesg.sendToTarget();

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

Handler handler = new Handler(new Handler.Callback() {
    @Override
    public boolean handleMessage(Message msg) {

        switch (msg.what) {
            case IMAGE_MSG:
                byte[] byteArray = (byte[]) msg.obj;
                Bitmap bitmap = BitmapFactory.decodeByteArray(byteArray, 0, byteArray.length);
                saveBitmapToInternalStorage(bitmap);
        }
        return false;
    }
});

private void saveBitmapToInternalStorage(Bitmap bmp) {
    File directory = getApplicationContext().getDir("imageDir", Context.MODE_PRIVATE);
    File myPath = new File(directory, UUID.randomUUID().toString() + ".png");
    FileOutputStream fos = null;
    try {
        fos = new FileOutputStream(myPath);
        bmp.compress(Bitmap.CompressFormat.PNG, 100, fos);
    } catch (Exception e) {
        Log.d("HELLO", "MY ERROR: " + e);
    } finally {
        try {
            fos.close();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}