handle_id3_metadata.java

@Override
public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {
  for (int i = 0; i < trackGroups.length; i++) {
    TrackGroup trackGroup = trackGroups.get(i);
    for (int j = 0; j < trackGroup.length; j++) {
      Metadata trackMetadata = trackGroup.getFormat(j).metadata;
      if (trackMetadata != null) {
        // We found metadata. Do something with it here!
      }
    }
  }
}