Minimal Chromecast

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.example.myapplication.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <Button
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:onClick="doMagic" />

</LinearLayout>

AndroidManifest.xml

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.myapplication">

    <uses-permission android:name="android.permission.INTERNET" />

    <application>
        <!--...-->
        
        <!-- TODO Change this com.example.myapplication to your package name -->
        <meta-data
            android:name="com.google.android.gms.cast.framework.OPTIONS_PROVIDER_CLASS_NAME"
            android:value="com.example.myapplication.CastOptionsProvider" />
    </application>
</manifest>

browse.xml(menu)

<?xml version="1.0" encoding="utf-8"?>
<menu xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">

    <item
        android:id="@+id/m_browse_cast"
        android:title="Cast"
        app:actionProviderClass="android.support.v7.app.MediaRouteActionProvider"
        app:showAsAction="always" />
</menu>

build.gradle

dependencies {
    //...
    compile 'com.android.support:mediarouter-v7:25.3.0'
    compile 'com.googlecode.android-query:android-query:0.25.9'
    compile 'com.google.android.gms:play-services-cast-framework:10.2.1'
}

CastOptionsProvider.java

public class CastOptionsProvider implements OptionsProvider {

    private static final String APP_ID = "4F8B3483";

    @Override
    public CastOptions getCastOptions(Context context) {
        return new CastOptions.Builder()
                .setReceiverApplicationId(APP_ID)
                .build();
    }

    @Override
    public List<SessionProvider> getAdditionalSessionProviders(Context context) {
        return null;
    }
}

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivityTAG_";

    private static final String VIDEO_TITLE = "Hello title";
    private static final String VIDEO_SUBTITLE = "Hello subtitle";
    private static final String VIDEO_URL = "http://techslides.com/demos/sample-videos/small.mp4";
    private static final String VIDEO_TYPE = "videos/mp4";
    private static final int VIDEO_DURATION = 5;

    private CastContext castContext;
    private MenuItem mediaRouteMenuItem;
    private CastSession castSession;

    private SessionManagerListener<CastSession> sessionManagerListener;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        castContext = CastContext.getSharedInstance(this);
        castSession = castContext.getSessionManager().getCurrentCastSession();
        sessionManagerListener = generateSessionManagerListener();
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.browse, menu);
        mediaRouteMenuItem = CastButtonFactory.setUpMediaRouteButton(getApplicationContext(), menu, R.id.m_browse_cast);
        return true;
    }

    @Override
    protected void onResume() {
        castContext.getSessionManager().addSessionManagerListener(sessionManagerListener, CastSession.class);
        super.onResume();
    }

    private MediaInfo buildMediaInfo() {
        MediaMetadata movieMetadata = new MediaMetadata(MediaMetadata.MEDIA_TYPE_MOVIE);

        movieMetadata.putString(MediaMetadata.KEY_SUBTITLE, VIDEO_SUBTITLE);
        movieMetadata.putString(MediaMetadata.KEY_TITLE, VIDEO_TITLE);

        return new MediaInfo.Builder(VIDEO_URL)
                .setStreamType(MediaInfo.STREAM_TYPE_BUFFERED)
                .setContentType(VIDEO_TYPE)
                .setMetadata(movieMetadata)
                .setStreamDuration(VIDEO_DURATION * 1000)
                .build();
    }

    public void doMagic(View view) {
        if (castSession == null) {
            Toast.makeText(this, "Connect to Chromecast first", Toast.LENGTH_SHORT).show();
            return;
        }
        RemoteMediaClient remoteMediaClient = castSession.getRemoteMediaClient();
        remoteMediaClient.load(buildMediaInfo(), true, 0);
    }

    private SessionManagerListener<CastSession> generateSessionManagerListener() {
        return new SessionManagerListener<CastSession>() {
            @Override
            public void onSessionStarting(CastSession castSession) {

            }

            @Override
            public void onSessionStarted(CastSession castSession, String s) {
                MainActivity.this.castSession = castSession;
            }

            @Override
            public void onSessionStartFailed(CastSession castSession, int i) {

            }

            @Override
            public void onSessionEnding(CastSession castSession) {

            }

            @Override
            public void onSessionEnded(CastSession castSession, int i) {

            }

            @Override
            public void onSessionResuming(CastSession castSession, String s) {

            }

            @Override
            public void onSessionResumed(CastSession castSession, boolean b) {
                MainActivity.this.castSession = castSession;
            }

            @Override
            public void onSessionResumeFailed(CastSession castSession, int i) {

            }

            @Override
            public void onSessionSuspended(CastSession castSession, int i) {

            }
        };
    }
}