[英]FATAL EXCEPTION: main java.lang.IllegalStateException When press Back
我有在MediaPlayer中的Thread中運行的Runnable。 當我按回時,我得到一個IllegalStateException。
這是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();
}
錯誤日志:
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)
我懷疑您在此活動的OnPause()
方法中調用了mp.pause()
。 因此,當您單擊“后退”按鈕時,MediaPayer進入了暫停狀態。 但是,由於您的Runnable稱為異步,因此它將在無效狀態下調用mp.getDuration()。 要解決此問題,請添加檢查:
if (mp.isPlaying()) {
long totalDuration = mp.getDuration();
long currentDuration = mp.getCurrentPosition();
}
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