用戶的崩潰報告。 我該如何解決此崩潰？

Question

我昨天上傳了我的應用，現在有用戶向我發送了崩潰報告。 這是報告：

java.lang.RuntimeException: Unable to pause activity {com.aaron.waller.angelasoundboard/com.aaron.waller.angelasoundboard.MainActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.pause()' on a null object reference
    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:4591)
    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:4550)
    at android.app.ActivityThread.handlePauseActivity(ActivityThread.java:4525)
    at android.app.ActivityThread.access$1300(ActivityThread.java:222)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1806)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:158)
    at android.app.ActivityThread.main(ActivityThread.java:7229)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.media.MediaPlayer.pause()' on a null object reference
    at com.aaron.waller.angelasoundboard.MainActivity.onPause(MainActivity.java:145)
    at android.app.Activity.performPause(Activity.java:7033)
    at android.app.Instrumentation.callActivityOnPause(Instrumentation.java:1339)
    at android.app.ActivityThread.performPauseActivity(ActivityThread.java:4577)
    ... 10 more

onPause（）方法出現問題，對嗎？ 我現在能做什么？

Answer 1

只需使用與其他情況下相同的支票即可：

@Override
protected void onPause() {
    if(mp != null && mp.isPlaying()){
        mp.pause();
    }
    super.onPause();
}