android中暂停背景音乐

{
 private Visualizer visualizer = null;//频谱测试器
 private byte [] mRawVizData;//频谱容器


 //实例化 Visualizer 对象
 visualizer = new Visualizer(0); 
 mRawVizData = new byte[128];

 //对象的初始化
 if(visualizer != null)
 {
  if (visualizer.getEnabled()) {
    visualizer.setEnabled(false);

   }

    visualizer.setCaptureSize(mRawVizData.length);//一定要在频谱false状态使用
    visualizer.setEnabled(true);//开启频谱获取

 }

int status = Visualizer.ERROR;

 if(visualizer != null)
 {

  //音乐频谱获取
  status = visualizer.getFft(mRawVizData);//获取波形图

  if(status != Visualizer.SUCCESS)
  {
  Log.i("answer", "getWaveFail");
  }
  else
  {             
  int j = 0;

  for(int i = 0; i <128; i++)
  {

    if(mRawVizData[i] == 0)
    {
      j++;
    }
  }

    Log.i("answer", "getWave j = " + j);
  }
 }
}