带定时器的Android Sync视频

我正在使用Android构建使用VideoView的视频播放器。我已经设法让视频播放器运行，现在我使用天文台设置了一个计数器，当我选择该文件时，该计时器开始打勾。
但是，当剪辑开始时，视频剪辑需要几秒钟才能开始运行，而定时器已经开始计算几秒钟。带定时器的Android Sync视频

如何编码以将计数器与媒体文件同步？
我检查过，但似乎无法找到答案。

video = (VideoView) findViewById(R.id.video); 
    play = (Button) findViewById(R.id.play); 
    pause = (Button) findViewById(R.id.pause); 
    stop = (Button) findViewById(R.id.stop); 
    reset = (Button) findViewById(R.id.reset); 
    Chronometer counter = (Chronometer) findViewById(R.id.chrono); 
    startTime = SystemClock.elapsedRealtime(); 
    time = (TextView) findViewById(R.id.time); 

     try { 
     video.setVideoPath(link); 
     video.start(); 
     video.requestFocus(); 
    } catch (IllegalArgumentException e) { 
     e.printStackTrace(); 
    } catch (IllegalStateException e) { 
     e.printStackTrace(); 
    } 

    play.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 
      video.start(); 
      video.requestFocus(); 
     } 
    }); 
    pause.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 
      video.pause(); 
     } 
    }); 
    stop.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 
      try { 
       video.stopPlayback(); 
       video.setVideoPath(link); 
      } catch (IllegalStateException e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 
    reset.setOnClickListener(new OnClickListener() { 
     public void onClick(View v) { 
      try { 
       video.seekTo(0); 
       video.start(); 
       video.requestFocus(); 
      } catch (IllegalStateException e) { 
       e.printStackTrace(); 
      } 
     } 
    }); 

counter.setOnChronometerTickListener(new OnChronometerTickListener(){ 
     public void onChronometerTick(Chronometer arg0) { 
      countUp = (SystemClock.elapsedRealtime() - arg0.getBase())/1000; 
      duration = video.getDuration(); 
      if (countUp % 60 <= 9) { 
       countText = (countUp/60) + ":0" + (countUp % 60); 
      } else { 
       countText = (countUp/60) + ":" + (countUp % 60);   
      } 
      if (duration % 60000 <= 9) { 
       durationText = (duration/60000) + ":0" + (duration % 60000); 
      } else { 
       durationText = (duration/60000) + ":" + (duration % 60000);   
      } 
      time.setText(countText + "/" + durationText); 
     } 
    }); 
    counter.start();

来源

2011-01-25 Zephyr

不用担心，我发现了一种使用VideoView getCurrentPosition（）的天文台表。现在它总是看到正确的当前时间，并且更容易检查。

counter.setOnChronometerTickListener(new OnChronometerTickListener(){ 
     public void onChronometerTick(Chronometer arg0) { 
      countUp = video.getCurrentPosition(); 
      countUp = Math.round(countUp/1000); 
      duration = video.getDuration(); 
      duration = duration/1000; 
      long a = (long) countUp; 
      if (countUp % 60000 <= 9) { 
       countText = (a/60000) + ":0" + (a % 60000); 
      } else { 
       countText = (a/60000) + ":" + (a % 60000);   
      } 
      if (duration % 60000 <= 9) { 
       durationText = (duration/60000) + ":0" + (duration % 60000); 
      } else { 
       durationText = (duration/60000) + ":" + (duration % 60000);   
      } 
      time.setText(countText + "/" + durationText); 
     } 
    }); 
    counter.start();

来源

2011-01-26 08:47:32 Zephyr

我会给我两分钱，因为它可以帮助别人。

您可以在onPreparedListener上设置您将能够获得MediaPlayer的位置。 MediaPlayer具有onInfoListener，它可让您知道媒体何时被缓冲，甚至是第一帧实际上是否呈现MEDIA_INFO_VIDEO_RENDERING_START（仅API 17+）。我使用它来更新本地状态变量（类似于：重写的VideoView类中的enum VideoPlayerState（BUFFERING，PLAYING，STOPPED，OPEN，PAUSED））。当状态改变时，您可以重写其setter以获取回调。该回调可以启动/暂停您的计时器。

setOnPreparedListener(new OnPreparedListener() { 
     @Override 
     public void onPrepared(final MediaPlayer mp) { 
      mp.setOnInfoListener(new OnInfoListener() { 

       @Override 
       public boolean onInfo(MediaPlayer mp, int what, int extra) { 
        if (what == MediaPlayer.MEDIA_INFO_BUFFERING_START) { 
         setPlayerState(VideoPlayerState.BUFFERING); 
        } else if (what == MediaPlayer.MEDIA_INFO_BUFFERING_END) { 
         if (mp.isPlaying() 
           && mPlayerState == VideoPlayerState.BUFFERING) { 
          setPlayerState(VideoPlayerState.PLAYING); 
         } 
        } 
        return false; 
       } 
      }); 
});

您还可以覆盖在VideoView这些方法来切换状态：

@Override 
public void pause() { 
    super.pause(); 
    setPlayerState(VideoPlayerState.PAUSED); 
} 

@Override 
public void start() { 
    super.start(); 
    setPlayerState(VideoPlayerState.PLAYING); 
} 

@Override 
public void stopPlayback() { 
    super.stopPlayback(); 
    setPlayerState(VideoPlayerState.STOPPED); 
}

希望它能帮助。

来源

2013-09-02 05:57:21 Alex

带定时器的Android Sync视频

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