title: Chromecast MediaTrack
body: <p>How can I load a subtitle to chromecast Media player?</p>
  
  <pre><code>List&lt;MediaTrack&gt; subs = new ArrayList&lt;MediaTrack&gt;();
  ... MediaTrack.Builder(long trackid, MediaTrack.TYPE_TEXT);
  </code></pre>
  
  <p>I dont know how to get trackid....</p>
  
  <p>EDIT:</p>
  
  <pre><code>long subId = 12;
  long[] subIds = {subId};
  MediaTrack track = new MediaTrack.Builder(subId,MediaTrack.TYPE_TEXT).setContentId("http://example.com/abc.srt").build();
      subs.add(track);
  ...
  mediaInfo.setMediaTracks(subs);
  ...
  mRemoteMediaPlayer.setActiveMediaTracks(mApiClient,subIds);
  </code></pre>
  
  <p>subtitles are not being shown</p>