Question

有人知道是否可以检测VideoView何时缓冲？

我希望在视频缓冲时显示ProgressDialog。

到目前为止，我尝试使用OnPreparedListener，但这仅在首次加载视频时才有效。如果正在播放视频并且用户将滑动条移动到另一个点，则视频仍然“准备好”，即使它正在缓冲。

我也试过（我知道这很糟糕）AsyncThread只是忙着等待isPlaying（）：

private class BufferTask extends AsyncTask<Void, Void, Void> {

  protected Void doInBackground(Void...voids) {
    final VideoView videoView = (VideoView)findViewById(R.id.video);
    while (!videoView.isPlaying()) { }
    return null;
  }

 protected void onPostExecute(Void v) {
     // Hide the dialog here...
 }
}

这不起作用，因为只要你调用start（），即使它正在缓冲，VideoView也会被视为正在播放。

我能想到的唯一解决方案是构建自定义VideoView类型类，以便我可以访问其MediaPlayer实例。

有什么想法吗？谢谢你的阅读。

Answer 1

从API level 17开始，您现在可以从MediaPlayer访问InfoListener：

final MediaPlayer.OnInfoListener onInfoToPlayStateListener = new MediaPlayer.OnInfoListener() {

    @Override
    public boolean onInfo(MediaPlayer mp, int what, int extra) {
        switch (what) {
            case MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START: {
                mProgressBar.setVisibility(View.GONE);
                return true;
            }
            case MediaPlayer.MEDIA_INFO_BUFFERING_START: {
                mProgressBar.setVisibility(View.VISIBLE);
                return true;
            }
            case MediaPlayer.MEDIA_INFO_BUFFERING_END: {
                mProgressBar.setVisibility(View.VISIBLE);
                return true;
            }
        }
        return false;
    }

});

mVideoView.setOnInfoListener(onInfoToPlayStateListener);

Answer 2

我带来了以下hack，以便不实现自定义VideoView。如果当前位置与之前的1秒相同，则每1秒检查一次。如果是，则视频正在缓冲。如果没有，视频真的在播放。

final Handler handler = new Handler(); 
Runnable runnable = new Runnable() { 
    public void run() {
        int duration = videoView.getCurrentPosition();
        if (old_duration == duration && videoView.isPlaying()) {
            videoMessage.setVisibility(View.VISIBLE);
        } else {
            videoMessage.setVisibility(View.GONE);
        }
        old_duration = duration;

        handler.postDelayed(runnable, 1000);
    }
};
handler.postDelayed(runnable, 0);

videoMessage只是一个TextView，文本“Buffering ...”放在我的VideoView的中心。

Answer 3

以下代码将在每次VideoView缓冲时显示缓冲对话框。

    final ProgressDialog bufferingDialog;
    bufferingDialog = ProgressDialog.show(context,
            "Buffering", "Please wait", true, true);

    VideoView videoView;
    videoView = (VideoView) findViewById(R.id.video_view);
    videoView.setVideoPath(path);
    videoView.setMediaController(new MediaController(context));
    videoView.requestFocus();
    videoView.start();
    videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            mp.setOnInfoListener(new MediaPlayer.OnInfoListener() {
                @Override
                public boolean onInfo(MediaPlayer mp, int what, int extra) {
                    if (what == MediaPlayer.MEDIA_INFO_BUFFERING_START)
                        bufferingDialog.show();
                    if (what == MediaPlayer.MEDIA_INFO_BUFFERING_END)
                        bufferingDialog.dismiss();
                    return false;
                }
            });
        }
    });
    videoView.setOnErrorListener(new MediaPlayer.OnErrorListener() {
        @Override
        public boolean onError(MediaPlayer mp, int what, int extra) {
            bufferingDialog.dismiss();
            return false;
        }
    });

Answer 4

VideoView showing Progress while Buffering
Below code worked for me


videoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
            @Override
            public void onPrepared(final MediaPlayer mp) {
                mp.start();
                mp.setOnInfoListener(new MediaPlayer.OnInfoListener() {
                    @Override
                    public boolean onInfo(MediaPlayer mp, int what, int extra) {
                        switch (what) {
                            case MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START: {
                                progressBar.setVisibility(View.GONE);
                                return true;
                            }
                            case MediaPlayer.MEDIA_INFO_BUFFERING_START: {
                                progressBar.setVisibility(View.VISIBLE);
                                return true;
                            }
                            case MediaPlayer.MEDIA_INFO_BUFFERING_END: {
                                progressBar.setVisibility(View.GONE);
                                return true;
                            }
                        }
                        return false;
                    }
                });
            }
        });

Answer 5

我正在做类似的事情，但无法提出一个很好的解决方案。发布了一些有趣的解决方案here，如果您还没有看到它们，请查看。

无论如何，我想出了上面提到的以下黑客攻击，现在可以正常工作。

@Override
public void onBufferingUpdate(MediaPlayer mp, int percent) {
    float temp = ((float)mp.getCurrentPosition() / (float)mp.getDuration())*100;
    if(Math.abs(percent - temp) < 1) {
        buffer_fail++;
        if(buffer_fail == 15) {
            //buffer failed
        }
    }
}

Answer 6

这对我有用

boolean b_start = true;
boolean b_end = true;                                                                  
 final MediaPlayer.OnInfoListener onInfoToPlayStateListener = new MediaPlayer.OnInfoListener() {

        @Override
        public boolean onInfo(MediaPlayer mp, int what, int extra) {
            switch (what) {
                case MediaPlayer.MEDIA_INFO_VIDEO_RENDERING_START: {
                    dialog1.setVisibility(View.GONE);
                    b_end = false;
                    b_start = false;

                }
                case MediaPlayer.MEDIA_INFO_BUFFERING_START: {
                    if (b_start){
                    dialog1.setVisibility(View.VISIBLE);
                    }
                    b_start = true;

                }
                case MediaPlayer.MEDIA_INFO_BUFFERING_END: {
                    if(b_end){
                    dialog1.setVisibility(View.VISIBLE);
                    }
                    b_end = true;
                }
            }
            return false;
        }

    };


    videoView.setOnInfoListener(onInfoToPlayStateListener);

检测VideoVIew是否正在缓冲

6 个答案: