我的音乐播放器应用程序似乎有问题。当我退出它时,它会弹出强制关闭警告。这是代码的一部分,我认为在调试后可能是问题的原因:
private Runnable mUpdateTimeTask = new Runnable() {
public void run() {
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);
}
};
这是logcat:
12-13 13:26:01.700: E/AndroidRuntime(31838): FATAL EXCEPTION: main
12-13 13:26:01.700: E/AndroidRuntime(31838): java.lang.IllegalStateException
12-13 13:26:01.700: E/AndroidRuntime(31838): at android.media.MediaPlayer.getDuration(Native Method)
12-13 13:26:01.700: E/AndroidRuntime(31838): at com.example.musicshare.AndroidBuildingMusicPlayerActivity$1.run(AndroidBuildingMusicPlayerActivity.java:341)
12-13 13:26:01.700: E/AndroidRuntime(31838): at android.os.Handler.handleCallback(Handler.java:587)
12-13 13:26:01.700: E/AndroidRuntime(31838): at android.os.Handler.dispatchMessage(Handler.java:92)
12-13 13:26:01.700: E/AndroidRuntime(31838): at android.os.Looper.loop(Looper.java:123)
12-13 13:26:01.700: E/AndroidRuntime(31838): at android.app.ActivityThread.main(ActivityThread.java:3691)
12-13 13:26:01.700: E/AndroidRuntime(31838): at java.lang.reflect.Method.invokeNative(Native Method)
12-13 13:26:01.700: E/AndroidRuntime(31838): at java.lang.reflect.Method.invoke(Method.java:507)
12-13 13:26:01.700: E/AndroidRuntime(31838): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:847)
12-13 13:26:01.700: E/AndroidRuntime(31838): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:605)
12-13 13:26:01.700: E/AndroidRuntime(31838): at dalvik.system.NativeStart.main(Native Method)
我认为问题出在 mp.getDuration 上,但我不知道如何解决。