Question

我有Runnable在MediaPlayer中的Thread中运行。当我按回来时，我得到一个IllegalStateException。

这是Runnable：

mp是MediaPlayer

private Runnable mUpdateTimeTask = new Runnable() {
       public void run() //This line is AndroidBuildingMusicPlayerActivity.java:318
       {

           long totalDuration = mp.getDuration();
           long currentDuration = mp.getCurrentPosition();

           // Displaying Total Duration time
           songTotalDurationLabel.setText(""+utils.milliSecondsToTimer(totalDuration));
           // Displaying time completed playing
           songCurrentDurationLabel.setText(""+utils.milliSecondsToTimer(currentDuration));

           // Updating progress bar
           int progress = (int)(utils.getProgressPercentage(currentDuration, totalDuration));
           //Log.d("Progress", ""+progress);
           songProgressBar.setProgress(progress);

           // Running this thread after 100 milliseconds
           mHandler.postDelayed(this, 100);
       }
    };

OnDetroy方法：

@Override
 public void onDestroy(){
 super.onDestroy();
    mp.release();
 }

错误日志：

 FATAL EXCEPTION: main
java.lang.IllegalStateException
        at android.media.MediaPlayer.getDuration(Native Method)
        at com.androidhive.musicplayer.AndroidBuildingMusicPlayerActivity$9.run(AndroidBuildingMusicPlayerActivity.java:318)
        at android.os.Handler.handleCallback(Handler.java:587)
        at android.os.Handler.dispatchMessage(Handler.java:92)
        at android.os.Looper.loop(Looper.java:130)
        at android.app.ActivityThread.main(ActivityThread.java:3683)
        at java.lang.reflect.Method.invokeNative(Native Method)
        at java.lang.reflect.Method.invoke(Method.java:507)
        at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
        at dalvik.system.NativeStart.main(Native Method)

Answer 1

我怀疑您在此活动的mp.pause()方法中调用了OnPause()。因此，当您单击后退按钮时，MediaPayer进入暂停状态。但是，由于Runnable被称为异步，因此它将在无效状态下调用mp.getDuration（）。要解决此问题，请添加支票：

if (mp.isPlaying()) {
   long totalDuration = mp.getDuration();
   long currentDuration = mp.getCurrentPosition();
}

FATAL EXCEPTION：main java.lang.IllegalStateException按Back

1 个答案: