Player.EventListener 的 SimpleExoPlayer 不工作

Question

我正在从 URL 播放视频，我想在视频开始播放时显示一段文字。文本可能类似于“6 之 1”。

我添加了 Player.EventListener 但它不起作用。

  // Player Event Listener
Player.EventListener eventListener = new Player.EventListener() {
    @Override
    public void onTimelineChanged(Timeline timeline, Object manifest) {

    }

    @Override
    public void onTracksChanged(TrackGroupArray trackGroups, TrackSelectionArray trackSelections) {

    }

    @Override
    public void onLoadingChanged(boolean isLoading) {
        progressBar.setVisibility(isLoading ? View.VISIBLE : View.GONE);
    }

    @Override
    public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
        if (playbackState == PlaybackStateCompat.ACTION_SKIP_TO_NEXT) {
            Toast.makeText(VideoActivity.this, "next", Toast.LENGTH_SHORT).show();
        }

        if (playbackState == PlaybackStateCompat.ACTION_SKIP_TO_PREVIOUS) {
            Toast.makeText(VideoActivity.this, "previous", Toast.LENGTH_SHORT).show();
        }
    }

    @Override
    public void onRepeatModeChanged(int repeatMode) {

    }

    @Override
    public void onPlayerError(ExoPlaybackException error) {

    }

    @Override
    public void onPositionDiscontinuity() {

    }

    @Override
    public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) {

    }
};

更新

onCreate 方法

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_video);
    ButterKnife.bind(this);

    presenter = new VideosPresenter(this);
    presenter.getVideoUrls();


    // 1. Create a default TrackSelector
    bandwidthMeter = new DefaultBandwidthMeter();
    videoTrackSelectionFactory = new AdaptiveTrackSelection.Factory(bandwidthMeter);
    trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);

    // 2. Create a default LoadControl
    LoadControl loadControl = new DefaultLoadControl();

    // 3. Create the player
    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector, loadControl);
    mediaDataSourceFactory = new DefaultDataSourceFactory(this, Util.getUserAgent(this, getString(R.string.app_name)), null);

    simpleExoPlayerView = findViewById(R.id.player_view);
    simpleExoPlayerView.requestFocus();
    simpleExoPlayerView.setPlayer(player);

    presenter = new VideosPresenter(this);
    player.addListener(eventListener);

}

初始化

    private void initializePlayer() {
    simpleExoPlayerView.requestFocus();
    TrackSelection.Factory videoTrackSelectionFactory =
            new AdaptiveTrackSelection.Factory(bandwidthMeter);
    trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
    simpleExoPlayerView.setPlayer(player);

    MediaSource[] mediaSources = new MediaSource[urlList.size()];
    for (int i = 0; i < urlList.size(); i++) {
        mediaSources[i] = buildMediaSource(Uri.parse(urlList.get(i)));
    }
    MediaSource mediaSource = mediaSources.length == 1 ? mediaSources[0]
            : new ConcatenatingMediaSource(mediaSources);
    player.prepare(mediaSource);
}

已获取视频网址

@Override
public void onVideosFetched(String[] urls) {
    if (urls.length == 0) {
        showAlertAndFinish(getString(R.string.empty_video_message));
        return;
    }
    urlList.addAll(new ArrayList<>(Arrays.asList(urls)));
    initializePlayer();
   /* if ((*//*Util.SDK_INT <= 23 ||*//* player == null)) {
        initializePlayer();
    }*/
}

Answer 1

调用 onVideosFetched(String[] urls) 方法后，您正在 initializePlayer() 方法中重新初始化播放器。但是你还没有在那里分配 eventListener。

private void initializePlayer() {
    simpleExoPlayerView.requestFocus();
    TrackSelection.Factory videoTrackSelectionFactory =
            new AdaptiveTrackSelection.Factory(bandwidthMeter);
    trackSelector = new DefaultTrackSelector(videoTrackSelectionFactory);
    player = ExoPlayerFactory.newSimpleInstance(this, trackSelector);
    simpleExoPlayerView.setPlayer(player);

    MediaSource[] mediaSources = new MediaSource[urlList.size()];
    for (int i = 0; i < urlList.size(); i++) {
        mediaSources[i] = buildMediaSource(Uri.parse(urlList.get(i)));
    }
    MediaSource mediaSource = mediaSources.length == 1 ? mediaSources[0]
            : new ConcatenatingMediaSource(mediaSources);
    player.prepare(mediaSource);


    //Add lister to the player
    player.addListener(eventListener);
}

希望对您有所帮助:)

Answer 2

您似乎使用了错误的播放状态常量。 ExoPlayer has 4 state constants in Player 分别是 Player.STATE_IDLE、Player.STATE_BUFFERING、Player.STATE_READY 和 Player.STATE_ENDED。

要检测玩家何时从时间轴中的一项转到另一项，您需要使用 onPositionDiscontinuity 而不是 onPlaybackStateChanged。这样的事情可能会成功：

int lastWindowIndex;

@Override
public void onPositionDiscontinuity(int reason) {
  int currentWindowIndex = player.getCurrentWindowIndex();
  if (reason == Player.DISCONTINUITY_REASON_PERIOD_TRANSITION) {
    if (lastPlaybackState == currentWindowIndex - 1) {
      // skipped to next
    } else if (lastPlaybackState == currentWindowIndex + 1) {
      // skipped to previous
    } else {
      // jumped more than one window index
    }
  }
  lastWindowIndex = currentWindowIndex;
  startOrUpdateNotification();
}

Player.EventListener 的 SimpleExoPlayer 不工作

Player.EventListener of SimpleExoPlayer is not working

android

exoplayer