How to use android.support.v7.media

private void disconnect() {
 if (client != null) {
  client.release();
  client=null;
 }
 router.getDefaultRoute().select();
}

 private void handleDiscovery() {
  MediaRouteDescriptor.Builder mrdBuilder=
    new MediaRouteDescriptor.Builder(DEMO_ROUTE_ID, "Demo Route");

  mrdBuilder.setDescription("The description of a demo route")
       .addControlFilter(ifPlay)
       .addControlFilter(ifControl)
       .setPlaybackStream(AudioManager.STREAM_MUSIC)
       .setPlaybackType(MediaRouter.RouteInfo.PLAYBACK_TYPE_REMOTE)
       .setVolumeHandling(MediaRouter.RouteInfo.PLAYBACK_VOLUME_FIXED);

  MediaRouteProviderDescriptor.Builder mrpdBuilder=
    new MediaRouteProviderDescriptor.Builder();

  mrpdBuilder.addRoute(mrdBuilder.build());

  setDescriptor(mrpdBuilder.build());
 }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.activity_main);
 selectedRoute=(TextView)findViewById(R.id.selected_route);
 router=MediaRouter.getInstance(this);
 selector=
   new MediaRouteSelector.Builder().addControlCategory(MediaControlIntent.CATEGORY_LIVE_AUDIO)
                   .addControlCategory(MediaControlIntent.CATEGORY_LIVE_VIDEO)
                   .addControlCategory(MediaControlIntent.CATEGORY_REMOTE_PLAYBACK)
                   .build();
}

 private boolean onSeekRequest(Intent i, ControlRequestCallback cb) {
  Log.d(getClass().getSimpleName(), "seek");

  MediaItemStatus.Builder statusBuilder=
    new MediaItemStatus.Builder(
                  MediaItemStatus.PLAYBACK_STATE_PLAYING);

  Bundle b=new Bundle();

  b.putBundle(MediaControlIntent.EXTRA_ITEM_STATUS,
        statusBuilder.build().asBundle());

  cb.onResult(b);

  return(true);
 }
}

@Override
public void onStop() {
 router.removeCallback(cb);
 super.onStop();
}

@Override
public void onStart() {
 super.onStart();
 router.addCallback(selector, cb,
           MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);
}

@Override
public void onAttach(Activity host) {
 super.onAttach(host);
 router=MediaRouter.getInstance(host);
}

 @Override
 protected void doWork() {
  client.release();
  client=null;
  if (getActivity() != null) {
   updateMenu();
   logToTranscript(getActivity().getString(R.string.session_ended));
  }
 }
}

 @Override
 public void onRouteSelected(MediaRouter router,
               MediaRouter.RouteInfo route) {
  selectedRoute.setText(route.toString());
 }
};

@Override
public void onDetach() {
 router.removeProvider(provider);
 super.onDetach();
}

 private void handleDiscovery() {
  MediaRouteDescriptor.Builder mrdBuilder=
    new MediaRouteDescriptor.Builder(DEMO_ROUTE_ID, "Demo Route");

  mrdBuilder.setDescription("The description of a demo route")
       .addControlFilter(ifPlay)
       .addControlFilter(ifControl)
       .setPlaybackStream(AudioManager.STREAM_MUSIC)
       .setPlaybackType(MediaRouter.RouteInfo.PLAYBACK_TYPE_REMOTE)
       .setVolumeHandling(MediaRouter.RouteInfo.PLAYBACK_VOLUME_FIXED);

  MediaRouteProviderDescriptor.Builder mrpdBuilder=
    new MediaRouteProviderDescriptor.Builder();

  mrpdBuilder.addRoute(mrdBuilder.build());

  setDescriptor(mrpdBuilder.build());
 }
}

 private boolean onSeekRequest(Intent i, ControlRequestCallback cb) {
  Log.d(getClass().getSimpleName(), "seek");

  MediaItemStatus.Builder statusBuilder=
    new MediaItemStatus.Builder(
                  MediaItemStatus.PLAYBACK_STATE_PLAYING);

  Bundle b=new Bundle();

  b.putBundle(MediaControlIntent.EXTRA_ITEM_STATUS,
        statusBuilder.build().asBundle());

  cb.onResult(b);

  return(true);
 }
}

@Override
public void onStop() {
 router.removeCallback(cb);
 super.onStop();
}

@Override
public void onStart() {
 super.onStart();
 router.addCallback(selector, cb,
           MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);
}

private boolean onGetStatusRequest(Intent i,
                  ControlRequestCallback cb) {
 Log.d(getClass().getSimpleName(), "get-status");
 MediaItemStatus.Builder statusBuilder=
   new MediaItemStatus.Builder(
                 MediaItemStatus.PLAYBACK_STATE_PLAYING);
 Bundle b=new Bundle();
 b.putBundle(MediaControlIntent.EXTRA_ITEM_STATUS,
       statusBuilder.build().asBundle());
 cb.onResult(b);
 return(true);
}

@Override
public void onStop() {
 router.removeCallback(cb);
 super.onStop();
}

@Override
public void onStart() {
 super.onStart();
 router.addCallback(selector, cb,
           MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);
}

private boolean onGetStatusRequest(Intent i,
                  ControlRequestCallback cb) {
 Log.d(getClass().getSimpleName(), "get-status");
 MediaItemStatus.Builder statusBuilder=
   new MediaItemStatus.Builder(
                 MediaItemStatus.PLAYBACK_STATE_PLAYING);
 Bundle b=new Bundle();
 b.putBundle(MediaControlIntent.EXTRA_ITEM_STATUS,
       statusBuilder.build().asBundle());
 cb.onResult(b);
 return(true);
}

@Override
public void onDestroy() {
 disconnect();
 router.removeCallback(routeCB);
 super.onDestroy();
}

private boolean onPlayRequest(Intent i, ControlRequestCallback cb) {
 Log.d(getClass().getSimpleName(), "play: "
   + i.getData().toString());
 MediaItemStatus.Builder statusBuilder=
   new MediaItemStatus.Builder(
                 MediaItemStatus.PLAYBACK_STATE_PLAYING);
 Bundle b=new Bundle();
 b.putString(MediaControlIntent.EXTRA_SESSION_ID, DemoRouteProvider.DEMO_SESSION_ID);
 b.putString(MediaControlIntent.EXTRA_ITEM_ID, DemoRouteProvider.DEMO_ITEM_ID);
 b.putBundle(MediaControlIntent.EXTRA_ITEM_STATUS,
       statusBuilder.build().asBundle());
 cb.onResult(b);
 return(true);
}