getDuration-获取媒体总长度值为-1

    android getDuration videoview mediaplayer
    120

    例如VideoView获取视频总长度：
    在视频播放前获取到的视频总长度都为-1
    想要在视频播放前获取到总长度的话:

    videoView.setOnPreparedListener(new MyOnPreparedListener());
private class MyOnPreparedListener implements OnPreparedListener{

		@Override
		public void onPrepared(MediaPlayer mp) {
			// TODO Auto-generated method stub

			video.getDuration();
		}
		
	}