How to implement oncompletionlistener to detect end of media file in Exoplayer

I know this is old, but just to expand on the accepted answer:

exoPlayer.addListener(this);.....@Overridepublic void onPlayerStateChanged(boolean playWhenReady, int state) {    if (state == ExoPlayer.STATE_ENDED){        //player back ended    }}

Exoplayer offer advance implementation which media player do not.

in Advance example of Exoplayer by Android, in FullPlayerActivity.java they have implemented onStateChanged, which offers STATE_ENDED

You can download example from the right hand section of this page under term RELATED SAMPLES

Google has deprecate ExoPlayer.STATE_ENDED and has replaced with Player.STATE_ENDED.

Since this post has been a while, I will write a Kotlin version of the listener down below.

this.simpleExoPlayer?.addListener(object : Player.DefaultEventListener() {    override fun onPlayerStateChanged(playWhenReady: Boolean,playbackState: Int) {        when (playbackState) {            Player.STATE_IDLE -> {}            Player.STATE_BUFFERING -> {}            Player.STATE_READY -> {}            Player.STATE_ENDED -> {}        }    }})

UPDATE: 05-2020Since DefaultEventListener and onPlayerStateChanged() are deprecated.

player.addListener(object : Player.EventListener {     override fun onPlaybackStateChanged(state: Int) {           if (state == Player.STATE_ENDED) {              // your code           }     }})