MediaRouteActionProvider

 <menu xmlns:android="http://schemas.android.com/apk/res/android"
         xmlns:app="http://schemas.android.com/apk/res-auto">
     <item android:id="@+id/media_route_menu_item"
         android:title="@string/media_route_menu_title"
         app:showAsAction="always"
         app:actionProviderClass="android.support.v7.app.MediaRouteActionProvider"/>
 </menu>
 

 public class MyActivity extends AppCompatActivity {
     private MediaRouter mRouter;
     private MediaRouter.Callback mCallback;
     private MediaRouteSelector mSelector;

     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);

         mRouter = Mediarouter.getInstance(this);
         mSelector = new MediaRouteSelector.Builder()
                 .addControlCategory(MediaControlIntent.CATEGORY_LIVE_AUDIO)
                 .addControlCategory(MediaControlIntent.CATEGORY_REMOTE_PLAYBACK)
                 .build();
         mCallback = new MyCallback();
     }

     // Add the callback on start to tell the media router what kinds of routes
     // the application is interested in so that it can try to discover suitable ones.
     public void onStart() {
         super.onStart();

         mediaRouter.addCallback(mSelector, mCallback,
                 MediaRouter.CALLBACK_FLAG_REQUEST_DISCOVERY);

         MediaRouter.RouteInfo route = mediaRouter.updateSelectedRoute(mSelector);
         // do something with the route...
     }

     // Remove the selector on stop to tell the media router that it no longer
     // needs to invest effort trying to discover routes of these kinds for now.
     public void onStop() {
         super.onStop();

         mediaRouter.removeCallback(mCallback);
     }

     public boolean onCreateOptionsMenu(Menu menu) {
         super.onCreateOptionsMenu(menu);

         getMenuInflater().inflate(R.menu.sample_media_router_menu, menu);

         MenuItem mediaRouteMenuItem = menu.findItem(R.id.media_route_menu_item);
         MediaRouteActionProvider mediaRouteActionProvider =
                 (MediaRouteActionProvider)MenuItemCompat.getActionProvider(mediaRouteMenuItem);
         mediaRouteActionProvider.setRouteSelector(mSelector);
         return true;
     }

     private final class MyCallback extends MediaRouter.Callback {
         // Implement callback methods as needed.
     }
 }