ExoPlayer getDuration

Question

I'm trying to play mp3 file from URL with ExoPlayer.

Everything is fine, but now I wonder when is the it is safe to call getDuration() of the audio track. I just need it once the track is loaded. I didn't find it in Google's example project.

When I try to get it immediately after exoPlayer.prepare() then I get UNKNOWN_TIME.

Answer 1

Ok, looks like this is the only solution here.

We add listener to our player, and get duration when state changes to STATE_READY. It will obviously called on every play/pause action so we need to wrap it with boolean durationSet flag if check to call it once on track start. Then durationSet = false somewhere near audioPlayer.prepare()

audioPlayer.addListener(new ExoPlayer.Listener() {
        @Override
        public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
            if (playbackState == ExoPlayer.STATE_READY && !durationSet) {
                long realDurationMillis = audioPlayer.getDuration();
                durationSet = true;
            }

        }

        @Override
        public void onPlayWhenReadyCommitted() {
            // No op.
        }

        @Override
        public void onPlayerError(ExoPlaybackException error) {
            // No op.
        }
    });