Android AsyncTask

Greetings community. I'm in a problem I'll start by saying that I do not know if I'm even in the amateur category. Anyway, with a lot of effort, I've made some progress, but I'm stuck. App to play a video on a device. That video shot him doing play from another place (via UDP implemented with ESP8266). Until the play, come. But I need to shoot Pause and Stop. I have not achieved it after several days. Code:

public class DemoActivity extends AppCompatActivity
package com.helap.player360;
{
public static final String sPath = "file://mnt/sdcard/vr/";
private String u;
private UDPUtils udpUtils;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_demo);
    udpUtils = new UDPUtils(this);
    udpUtils.startReceiveUdp();

    final EditText et = (EditText) findViewById(R.id.edit_text_url);

    SparseArray<String> data = new SparseArray<>();

    data.put(data.size(), sPath + "XXX.mp4");

    {
        @Override
        public void onSpinnerClicked(int index, int key, String value)
        {
            et.setText(value);
            u = value;
        }
    }).init(R.id.spinner_url);

    findViewById(R.id.sync_button).setOnClickListener(new View.OnClickListener()
    {
        @Override
        public void onClick(View v)
        {
            //MD360PlayerActivity.startVideo(DemoActivity.this, Uri.parse(u));
            SendMessage("192.168.0.25", "SYNC");
        }
    });
}

This block works well, without problems. Now the interface class, the next one, which also works.

package com.helap.player360;
public class UDPUtils implements AsyncResponse
{
   private UDPServer udpServer;
   private UDPSender udpSender;
   private DemoActivity context;
   public int modo;
   public UDPUtils(Context context){this.context=(DemoActivit)context;}

  @Override
  public void processFinish(final String output)
  {
      context.runOnUiThread(new Runnable()
      {
        @Override
        public void run()
        {
            if(output.equals("200"))
            {
                context.sync();
            }
            if(output.equals("300"))
            {
                context.start();
            }
            if(output.equals("400"))
            {
                modo = 3;
                //context.pausa();

            }
        }
    });
}

/** Start UDP server as asynctask **/
void startReceiveUdp()
{
    if (udpServer == null)
    {
        udpServer = new UDPServer();
        udpServer.setPort(8888);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
        {
            udpServer.delegate = this;
            udpServer.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
        }
        else
        {
            udpServer.execute();
        }
    }
}

interface AsyncResponse
{
    void processFinish(String output);
}

A class that I understand is an interface between the initiation and the ppal

public abstract class MD360PlayerActivity extends Activity
{

    private static final SparseArray<String> sDisplayMode = new SparseArray<>();
    private static final SparseArray<String> sInteractiveMode = new SparseArray<>();
    private static final SparseArray<String> sProjectionMode = new SparseArray<>();
private static final SparseArray<String> sAntiDistortion = new SparseArray<>();
private static final SparseArray<String> sPitchFilter = new SparseArray<>();
private static final SparseArray<String> sFlingEnabled = new SparseArray<>();
int m, n;
static
{
}

public static void startVideo(Context context, Uri uri)
{
    start(context, uri, VideoPlayerActivity.class);
}

private static void start(Context context, Uri uri, Class < ? extends Activity > clz)
{
    Intent i = new Intent(context, clz);
    i.setData(uri);
    context.startActivity(i);
}
public void cancelBusy(){findViewById(R.id.progress).setVisibility(View.GONE);}

//*******************************************************************************
private XXXLibrary mXXLibrary;
@Override
public void onCreate(Bundle savedInstanceState)
{
 ........
}

abstract protected XXXLibrary createXXXLibrary();

public MDVRLibrary getVRLibrary() {return mVRLibrary;}

@Override
protected void onResume()
{
    super.onResume();
    mVRLibrary.onResume(this);
}

@Override
protected void onPause()
{
    super.onPause();
    mVRLibrary.onPause(this);
}

@Override
protected void onDestroy()
{
    super.onDestroy();
    mVRLibrary.onDestroy();
}

@Override
public void onConfigurationChanged(Configuration newConfig)
{
    super.onConfigurationChanged(newConfig);
    mVRLibrary.onOrientationChanged(this);
}

protected Uri getUri()
{
    Intent i = getIntent();
    if (i == null || i.getData() == null)
      {
        return null;
      }
    return i.getData();
   }
}

And finally the class I can not act on.

package com.helap.player360;
import...
public class VideoPlayerActivity extends MD360PlayerActivity
{
private MediaPlayerWrapper mMediaPlayerWrapper = new   MediaPlayerWrapper();
private int d;

@Override
public void onCreate(Bundle savedInstanceState)
{
    mMediaPlayerWrapper.init();
    super.onCreate(savedInstanceState);
    mMediaPlayerWrapper.setPreparedListener(new IMediaPlayer.OnPreparedListener()
    {
        @Override
        public void onPrepared(IMediaPlayer mp)
        {
            cancelBusy();
            if (getVRLibrary() != null)
            {
                getVRLibrary().notifyPlayerChanged();
            }
        }
    });

    mMediaPlayerWrapper.getPlayer().setOnErrorListener(new IMediaPlayer.OnErrorListener()
    {
        @Override
        public boolean onError(IMediaPlayer mp, int what, int extra)
        {
            String error = String.format("Play Error what=%d extra=%d", what, extra);
            Toast.makeText(VideoPlayerActivity.this, error, Toast.LENGTH_SHORT).show();
            return true;
        }
    });

    mMediaPlayerWrapper.getPlayer().setOnVideoSizeChangedListener(new IMediaPlayer.OnVideoSizeChangedListener()
    {
        @Override
        public void onVideoSizeChanged(IMediaPlayer mp, int width, int height, int sar_num, int sar_den)
        {
            getVRLibrary().onTextureResize(width, height);
        }
    });
 /********************************************************/
    Uri uri = getUri();
    if (uri != null)
    {
        mMediaPlayerWrapper.openRemoteFile(uri.toString());
        mMediaPlayerWrapper.prepare();
    }

    findViewById(R.id.pause).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {
            mMediaPlayerWrapper.pause();
        }
    });
    findViewById(R.id.button_resume).setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v)
        {
            mMediaPlayerWrapper.resume();
        }
    });
}
//**********************************

@Override
protected void onDestroy()
{
    super.onDestroy();
    mMediaPlayerWrapper.destroy();
}

@Override
protected  void onPause()
{
    super.onPause();
    mMediaPlayerWrapper.pause();
}

@Override
protected void onResume()
{
    super.onResume();
    mMediaPlayerWrapper.resume();
   }
}

In these last three (protected void on Destroy (), protected void on Pause (), protected void on Resume ()) are the ones I want to act on via UDP with an AsyncTask, and the truth is, I have not succeeded. Any help, will be eternally grateful.