Created
June 6, 2023 20:48
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Position tracker for android media3 Player
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| private const val MIN_UPDATE_INTERVAL_MS: Long = 200 | |
| private const val MAX_UPDATE_INTERVAL_MS: Long = 1000 | |
| class PlayerPositionTracker { | |
| private val handlerUpdatePosition = Handler() | |
| private val runnableUpdatePosition = Runnable { updatePosition() } | |
| var player: Player? = null | |
| set(value) { | |
| field = value | |
| updatePlayerEventListenerRegistration() | |
| updatePosition() | |
| } | |
| var playerPositionListener: PlayerPositionListener? = null | |
| set(value) { | |
| field = value | |
| updatePlayerEventListenerRegistration() | |
| updatePosition() | |
| } | |
| private val playerEventListener = object : Player.Listener { | |
| override fun onEvents(player: Player, events: Player.Events) { | |
| if (events.containsAny( | |
| Player.EVENT_PLAYBACK_STATE_CHANGED, | |
| Player.EVENT_PLAY_WHEN_READY_CHANGED, | |
| Player.EVENT_IS_PLAYING_CHANGED, | |
| Player.EVENT_AVAILABLE_COMMANDS_CHANGED, | |
| Player.EVENT_POSITION_DISCONTINUITY, | |
| Player.EVENT_TIMELINE_CHANGED, | |
| Player.EVENT_AVAILABLE_COMMANDS_CHANGED | |
| ) | |
| ) updatePosition(player) | |
| } | |
| } | |
| private fun updatePlayerEventListenerRegistration() = player?.let { | |
| if (playerPositionListener != null) it.addListener(playerEventListener) | |
| else it.removeListener(playerEventListener) | |
| } | |
| private fun updatePosition(player: Player? = this.player) { | |
| handlerUpdatePosition.removeCallbacks(runnableUpdatePosition) | |
| if (player == null) return | |
| val position = player.currentPosition | |
| playerPositionListener?.onPlayerPositionChanged(position) | |
| val playbackState = player.playbackState | |
| if (player.isPlaying) | |
| handlerUpdatePosition.postDelayed( | |
| runnableUpdatePosition, | |
| player.playbackParameters.speed.let { playbackSpeed -> | |
| if (playbackSpeed > 0) ((1000 - position % 1000) / playbackSpeed).toLong() | |
| else MAX_UPDATE_INTERVAL_MS | |
| }.coerceIn(MIN_UPDATE_INTERVAL_MS, MAX_UPDATE_INTERVAL_MS) | |
| ) | |
| else if (playbackState != Player.STATE_ENDED && playbackState != Player.STATE_IDLE) | |
| handlerUpdatePosition.postDelayed(runnableUpdatePosition, MAX_UPDATE_INTERVAL_MS) | |
| } | |
| fun release() { | |
| handlerUpdatePosition.removeCallbacks(runnableUpdatePosition) | |
| player?.removeListener(playerEventListener) | |
| player = null | |
| playerPositionListener = null | |
| } | |
| } | |
| fun interface PlayerPositionListener { | |
| fun onPlayerPositionChanged(position: Long) | |
| } |
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