Android ExoPlayer onProgressChanged [英] Android ExoPlayer onProgressChanged

问题描述

如何监控 ExoPlayer 上的进度变化?
我试图实现一个隐藏的 MediaController 并覆盖 setOnSeekBarChangeListener 方法，但目前没有成功.我想知道是否有另一种方法可以收听 ExoPlayer 进度.

How can I monitor progress changes on ExoPlayer?
I tried to implement a hidden MediaController and overriding setOnSeekBarChangeListener methods, but for now without success. I'm wondering if there is another way to listen to the ExoPlayer progress.

推荐答案

我知道这个问题很老了.但是，我在实现 ExoPlayer 时就想到了这一点.这是为了帮助以后做同样事情的其他人:)

I know this question is very old. But, I landed on this while implementing ExoPlayer. This is to help the others who do the same later on:)

所以，我按照以下方法来跟踪播放进度.这是在 ExoPlayer Google Docs 中完成的方式.它可以根据需要工作.

So, I have followed the following methods to track progress of the playback. This is the way it is done in the ExoPlayer Google Docs. It works as needed.

在 Google ExoPlayer 存储库

updateProgressBar() 是更新SeekBar 进度的函数:

updateProgressBar() is the function to update the SeekBar progress:

private void updateProgressBar() {
    long duration = player == null ? 0 : player.getDuration();
    long position = player == null ? 0 : player.getCurrentPosition();
    if (!dragging) {
        mSeekBar.setProgress(progressBarValue(position));
    }
    long bufferedPosition = player == null ? 0 : player.getBufferedPosition();
    mSeekBar.setSecondaryProgress(progressBarValue(bufferedPosition));
    // Remove scheduled updates.
    handler.removeCallbacks(updateProgressAction);
    // Schedule an update if necessary.
    int playbackState = player == null ? Player.STATE_IDLE : player.getPlaybackState();
    if (playbackState != Player.STATE_IDLE && playbackState != Player.STATE_ENDED) {
        long delayMs;
        if (player.getPlayWhenReady() && playbackState == Player.STATE_READY) {
            delayMs = 1000 - (position % 1000);
            if (delayMs < 200) {
                delayMs += 1000;
            }
        } else {
            delayMs = 1000;
        }
        handler.postDelayed(updateProgressAction, delayMs);
    }
}

private final Runnable updateProgressAction = new Runnable() {
    @Override
    public void run() {
        updateProgressBar();
    }
};

我们在 updateProgressAction 中反复调用 updateProgressBar() 直到播放停止.每当状态发生变化时，都会第一次调用该函数.我们使用 removeCallbacks(Runnable runnable) 这样总有一个 updateProgressAction 需要关心.

We call updateProgressBar() within updateProgressAction repeatedly until the playback stops. The function is called the first time whenever there is a state change. We use removeCallbacks(Runnable runnable) so that there is always one updateProgressAction to care about.

@Override
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) {
  updateProgressBar();
}

希望这会有所帮助！

这篇关于Android ExoPlayer onProgressChanged的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！