Android的MediaPlayer的setNextMediaPlayer不工作 [英] Android MediaPlayer setNextMediaPlayer not working
问题描述
我的目标是创建一个 VideoView 可在 pre-定义播放列表播放视频
My objective is to create a VideoView that can play videos in a pre-defined play list.
我试图用 MediaPlayer.setNextMediaPlayer（...）来允许两个视频之间的无缝过渡。然而，当第一个影片播放完毕后，第二视频不会自动，因为它应该根据文档开始。
I'm trying to use MediaPlayer.setNextMediaPlayer(...) to allow a seamless transition between two videos. However, when the first video finishes playing, the 2nd video will not start automatically as it should according to the documentation.
Xamarin的Android code
Queue<MediaPlayer> MediaPlayerList = null;
private void PlayVideo()
{
MediaPlayerList = new Queue<MediaPlayer>();
//Let's go ahead and create all media players
VideoView_CurrentVideoView = new VideoView(this);
VideoView_CurrentVideoView.Completion += mVideoView_Completion;
VideoView_CurrentVideoView.Prepared += mVideoView_Prepared;
//Let's prepare all MediaPlayer
for (int i = 0; i < VideoView_CurrentVideoChannel.VideoAssetList.Count; i++)
{
string filePath = FilePath[i];
if (i == 0)
{
VideoView_CurrentVideoView.SetVideoPath(filePath);
VideoContainer.AddView(VideoView_CurrentVideoView);
}
else
{
MediaPlayer mpNew = new MediaPlayer();
mpNew.SetDataSource(filePath);
MediaPlayerList.Enqueue(mpNew);
}
}
VideoView_CurrentVideoView.Start();
}
void mVideoView_Completion(object sender, EventArgs e)
{
MediaPlayer mp = (MediaPlayer)sender;
mp.Release();
}
void mVideoView_Prepared(object sender, EventArgs e)
{
MediaPlayer mp = (MediaPlayer)sender;
//Take the next available MediaPlayer from the queue
MediaPlayer nextMediaPlayer = MediaPlayerList.Dequeue();
//Put the current MediaPlayer at the end of the queue
MediaPlayerList.Enqueue(mp);
nextMediaPlayer.Prepare();
mp.SetNextMediaPlayer(nextMediaPlayer);
}
任何帮助或建议，将大大AP preciated。这是 codeD Xamarin的Android 。
更新＃1：从prepared移动prepare（）离开后，（）事件
Queue<string> VideoListQueue = null;
MediaPlayer NextMediaPlayer = null;
private void PlayVideo()
{
string filePath = FilePath[0];
//Create video view
if (VideoContainer.ChildCount == 0)
{
//setup the videoview container
VideoView_CurrentVideoView = new VideoView(this);
VideoView_CurrentVideoView.Info += VideoView_CurrentVideoView_Info;
VideoView_CurrentVideoView.Error += VideoView_CurrentVideoView_Error;
LinearLayout.LayoutParams param = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.FillParent, ViewGroup.LayoutParams.FillParent);
param.LeftMargin = 0;
param.RightMargin = 0;
param.BottomMargin = 0;
param.TopMargin = 0;
VideoView_CurrentVideoView.LayoutParameters = param;
VideoView_CurrentVideoView.LayoutParameters.Width = ViewGroup.LayoutParams.FillParent;
VideoView_CurrentVideoView.LayoutParameters.Height = ViewGroup.LayoutParams.FillParent;
VideoView_CurrentVideoView.Completion += VideoView_CurrentVideoView_Completion;
VideoView_CurrentVideoView.Prepared += VideoView_CurrentVideoView_Prepared;
VideoContainer.AddView(VideoView_CurrentVideoView);
}
VideoView_CurrentVideoView.SetVideoPath(filePath);
VideoView_CurrentVideoView.SeekTo(0);
VideoView_CurrentVideoView.Start();
}
void VideoView_CurrentVideoView_Prepared(object sender, EventArgs e)
{
//Do nothing at this moment
MediaPlayer mp = (MediaPlayer)sender;
}
void VideoView_CurrentVideoView_Completion(object sender, EventArgs e)
{
//GC the finished MediaPlayer
MediaPlayer mp = (MediaPlayer)sender;
mp.Reset();
mp.Release();
mp = null;
//Preparing the next MediaPlayer
MediaPlayer currentPlayer = NextMediaPlayer;
NextMediaPlayer = SetupNextMediaPlayer();
currentPlayer.SetNextMediaPlayer(NextMediaPlayer);
}
MediaPlayer SetupNextMediaPlayer()
{
MediaPlayer mp = new MediaPlayer();
//When the video start playing, let's get ready for next one
string sourceURL = VideoListQueue.Dequeue();
VideoListQueue.Enqueue(sourceURL);
string filePath = sourceURL;
mp = new MediaPlayer();
mp.Info += VideoView_CurrentVideoView_Info;
mp.Completion += VideoView_CurrentVideoView_Completion;
mp.Prepared += VideoView_CurrentVideoView_Prepared;
mp.SetDataSource(filePath);
mp.Prepare();
//Fire back the created MediaPlayer object to the caller
return mp;
}
void VideoView_CurrentVideoView_Info(object sender, MediaPlayer.InfoEventArgs e)
{
Console.WriteLine("What = " + e.What);
switch (e.What)
{
case MediaInfo.VideoRenderingStart:
{
//This is only happening on video first started
NextMediaPlayer = SetupNextMediaPlayer();
e.Mp.SetNextMediaPlayer(NextMediaPlayer);
break;
}
}
}
void VideoView_CurrentVideoView_Error(object sender, MediaPlayer.ErrorEventArgs e)
{
e.Handled = true;
}
目前时刻，媒体播放器将一旦第一个完成开始播放第2视频。然而，第二个视频只有声音，没有图像显示。
At this moment, the media player will begin playing the 2nd video once the first one is done. However, the 2nd video only have sound and no video showing.
任何人都知道我做错了什么？我有一种感觉，它做的东西的MediaPlayer没有连接到SurfaceView。不过，我创建使用VideoView的观点，我怎么能得到表面从VideoView？
Anyone know what I did wrong? I have a feeling that it has to do something with the MediaPlayer not attached to the SurfaceView. However, I created the view using VideoView, how can I get the Surface from VideoView?
推荐答案
关于打第二只视频有声：尝试实施OnCompletionListener监听每个MediaPlayer的这个：
Regarding playing 2nd video only with sound: try to implement OnCompletionListener listener for each MediaPlayer with this:
mediaPlayer.setOnCompletionListener(new OnCompletionListener() {
@Override
public void onCompletion(MediaPlayer mp) {
mp.setDisplay(null); //for current mediaPlayer
nextMediaPlayer.setDisplay(getHolder()); //for next video
}
});
我不能说是无缝是，但不知何故，它的工作原理。要归档这个我不使用标准VideoView，但自定义视图，从SurfaceView延伸。
I can't say that is is gapless, but somehow it works. To archive this I don't use standard VideoView, but custom View, that extends from SurfaceView.
这篇关于Android的MediaPlayer的setNextMediaPlayer不工作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！
