How do I get the index of the current track being played using ExoPlayer

Question

I am working on an Android project that involves the use of Google's ExoPlayer. I have a list of video sources which I build a playlist from using the following code:

for (int i = 0; i < vidList.length(); i++) {
    MediaSource source = new ExtractorMediaSource(Uri.parse(vidList.getJSONObject(i).getString("url")),
                                buildDataSourceFactory(bandwidthMeter), extractorsFactory, mainHandler, HomeFragment.this);
                        mediaSources.add(source);
                        captions.add(vidList.getJSONObject(i).getString("caption"));
                    }

    mediaSource = new ConcatenatingMediaSource(mediaSources.toArray(new MediaSource[mediaSources.size()]));

I then call

exoplayer.prepare(mediasource, false, false)

and the videos play in succession fine. I would like to display the caption of the currently playing video in a textView and so I have a separate list that holds the "caption" values for each video.

From scouring through the code I see that I can get the currently playing video in the playlist like this;

exoPlayer.getCurrentPeriodIndex()

Which seems to work and returns the index except for one problem. It returns the value of 0 twice as playback starts. That is video at index 0 returns period 0 as well as video at index 1. This only occurs at indexes 0 and 1 and thereafter everything else looks fine except that the getCurrentPeriodIndex() will return theAccurateIndex - 1.

I see this also happening in the demo Exoplayer application. Is there a better way to determine what track is currently playing in the playlist?

Thanks.

Answer 1

To find the currently playing track, you need to reference currentWindowIndex exoPlayer field. Looks like this in Java...

exoPlayer.getCurrentWindowIndex()

I'm not sure what getCurrentPeriodIndex() does, and the docs don't elaborate, and I don't like speculating.

Answer 2

exoPlayer.getCurrentWindowIndex() is Deprecated.

Use exoPlayer.getCurrentMediaItemIndex() instead.