如何使用ExoPlayer播放一段時間（從網址播放）加載視頻時顯示進度條？

Question

我使用Exoplayer播放來自Url的視頻但是當視頻是緩衝區的時候，播放時只是吸球而沒有任何事情發生。所以，我決定在播放狀態下播放視頻緩衝區時顯示進度條。 那麼，如何實現使用Exoplayer？

Answer 1

播放器上的活動實施

ExoPlayer.EventListener

@Override 
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) { 
    if (playbackState == ExoPlayer.STATE_BUFFERING) { 
     //show your progress dialog here 
    } 
} 

Answer 2

在佈局文件

<FrameLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent"> 
<ProgressBar 
    android:id="@+id/exo_player_progress_bar" 
    android:layout_width="wrap_content" 
    android:layout_height="wrap_content" 
    android:layout_gravity="center"/> 
</FrameLayout> 

在活動課實施ExoPlayer.EventListener並添加此

@Override 
public void onTimelineChanged(Timeline timeline, Object manifest) { 

} 

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

} 

@Override 
public void onLoadingChanged(boolean isLoading) { 

} 

@Override 
public void onPlayerStateChanged(boolean playWhenReady, int playbackState) { 
    if (playbackState == ExoPlayer.STATE_BUFFERING){ 
     mProgressBar.setVisibility(View.VISIBLE); 
    } else { 
     mProgressBar.setVisibility(View.INVISIBLE); 
    } 
} 

@Override 
public void onRepeatModeChanged(int repeatMode) { 

} 

@Override 
public void onShuffleModeEnabledChanged(boolean shuffleModeEnabled) { 

} 

@Override 
public void onPlayerError(ExoPlaybackException error) { 

} 

@Override 
public void onPositionDiscontinuity(int reason) { 

} 

@Override 
public void onPlaybackParametersChanged(PlaybackParameters playbackParameters) { 

} 

@Override 
public void onSeekProcessed() { 

}