我正在使用ExoPlayer2.x的新功能来播放如下音频文件列表:
List<MediaSource> playlist = new ArrayList<>();
...
ConcatenatingMediaSource concatenatedSource = new ConcatenatingMediaSource(
playlist.toArray(new MediaSource[playlist.size()]));
mExoPlayer.prepare(concatenatedSource);
mExoPlayer.setPlayWhenReady(true);
这很好,但为了相应地更新我的UI,我需要知道当前正在播放哪首曲目以及这首曲目的进度。有来自ExoPlayer的听众吗?
谢谢!
所以我处于类似的情况,需要知道播放列表中的下一个视频何时开始。我发现ExoPlayer.EventListener
有一个名为onPositionDiscontinuity()
的方法,每当视频更改或"查找"到播放列表中的下一个时,就会调用它。
我还没有广泛地使用这种方法,但从目前为止我所看到的情况来看,这是你应该关心的方法。当方法被激发时,没有参数可以传递,所以你必须保留某种计数器或队列来跟踪在任何给定时刻播放的内容。
希望这能有所帮助!
编辑:建议使用Exoplayer.getCurrentWindowIndex()
返回的索引更改来检测播放列表MediaSource
中的项目更改。
int lastWindowIndex = 0; // global var in your class encapsulating exoplayer obj (Activity, etc.)
exoPlayer.addListener(new ExoPlayer.EventListener() {
@Override
public void onLoadingChanged(boolean isLoading) {
}
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
}
@Override
public void onTimelineChanged(Timeline timeline, Object manifest) {
}
@Override
public void onPlayerError(ExoPlaybackException error) {
}
@Override
public void onPositionDiscontinuity() {
//THIS METHOD GETS CALLED FOR EVERY NEW SOURCE THAT IS PLAYED
int latestWindowIndex = exoPlayer.getCurrentWindowIndex();
if (latestWindowIndex != lastWindowIndex) {
// item selected in playlist has changed, handle here
lastWindowIndex = latestWindowIndex;
// ...
}
}
});
您可以实现以下事件,并根据玩家的状态更新您的ui。
mExoPlayer.addListener(new ExoPlayer.Listener() {
@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
if (playbackState == PlaybackStateCompat.STATE_PLAYING) {
//do something
}
}
@Override
public void onPlayWhenReadyCommitted() {
}
@Override
public void onPlayerError(ExoPlaybackException error) {
mExoPlayer.stop();
}
});
由于这里的答案对我不起作用,我将在Kotlin中添加我的工作解决方案。从那时起,也有很多方法被弃用。
您可以在创建播放列表时通过设置mediaId来跟踪当前曲目(视频(
等级:
implementation 'com.google.android.exoplayer:exoplayer:2.14.1'
布局xml:
<com.google.android.exoplayer2.ui.PlayerView
android:id="@+id/player_view"
android:layout_width="match_parent"
android:layout_height="100dp"
app:show_buffering="when_playing"/>
代码:
private lateinit var exoPlayer: SimpleExoPlayer
private lateinit var playerView: PlayerView
private lateinit var fileList: List<FileModel>
private fun initPlayer() {
playerView = findViewById(R.id.player_view)
playerView.controllerShowTimeoutMs = 0
playerView.cameraDistance = 30F
exoPlayer = SimpleExoPlayer.Builder(this).build()
playerView.player = exoPlayer
setPlaylist()
exoPlayer.prepare()
exoPlayer.seekTo(position, C.TIME_UNSET) // position = current song or video
exoPlayer.playWhenReady = true
addPlayerListeners()
}
private fun setPlaylist() {
for ((pos, file) in fileList.withIndex()) {
val mediaItem = MediaItem.Builder().setUri(file.url).setMediaId(pos.toString()).build()
exoPlayer.addMediaItem(mediaItem)
}
}
private fun addPlayerListeners() {
exoPlayer.addListener(object : Player.Listener{
override fun onMediaItemTransition(mediaItem: MediaItem?, reason: Int) {
super.onMediaItemTransition(mediaItem, reason)
val item = mediaItem?.mediaMetadata
val bmp = item?.artworkData
Log.i(TAG, "position = ${mediaItem?.mediaId}")
val currentPos = mediaItem?.mediaId
updateViews(currentPos, bmp)
}
})
}
private fun updateViews(currentPos: String?, bmp: ByteArray?) {
position = currentPos?.toInt() ?: 0
val title = fileList[position].title
textview_title.text = title
if (bmp == null) {
image_view.setImageResource(R.drawable.exo_ic_default_album_image)
return
}
val bitmap = BitmapFactory.decodeByteArray(bmp, 0, bmp.size)
image_view.setImageBitmap(bitmap)
}
在Kotlin中,它看起来像这样:
player?.addListener(object : Player.Listener {
override fun onIsPlayingChanged(isPlaying: Boolean) {
super.onIsPlayingChanged(isPlaying)
_isPlaying.postValue(isPlaying)
}
fun onPlayerError(error: ExoPlaybackException?) {
player?.stop()
}
})
player.getCurrentMediaItemIndex();
返回播放列表中当前项目的索引。
player.getCurrentPosition();
返回正在播放的项目的时间位置(以毫秒为单位(。