java - 关闭应用程序后获取 NullPointerException - android

Question

我在关闭(并从我设备上最近的应用程序中删除)我的应用程序后收到此错误，它每次都会发生。

09-22 23:44:28.503    4021-4021/? I/art﹕ Late-enabling -Xcheck:jni
09-22 23:44:28.584    4021-4021/cz.united121.android.revizori D/cz.united121.android.revizori.App﹕ onCreate
09-22 23:44:28.642    4021-4021/cz.united121.android.revizori D/cz.united121.android.revizori.service.MyUpdatingService﹕ onCreate
09-22 23:44:28.677    4021-4021/cz.united121.android.revizori D/AndroidRuntime﹕ Shutting down VM
09-22 23:44:28.679    4021-4021/cz.united121.android.revizori E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: cz.united121.android.revizori, PID: 4021
    java.lang.RuntimeException: Unable to start service cz.united121.android.revizori.service.MyUpdatingService@3a7bf84e with null: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Intent.getAction()' on a null object reference
            at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2913)
            at android.app.ActivityThread.access$2100(ActivityThread.java:148)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1390)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5312)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.content.Intent.getAction()' on a null object reference
            at cz.united121.android.revizori.service.MyUpdatingService.onStartCommand(MyUpdatingService.java:94)
            at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2896)
            at android.app.ActivityThread.access$2100(ActivityThread.java:148)
            at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1390)
            at android.os.Handler.dispatchMessage(Handler.java:102)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5312)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:901)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:696)

异常引用的行 (Log.d(TAG, "onStartCommand"+ intent.getAction());) 在 onStartCommand 的服务中:

@Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        super.onStartCommand(intent, flags, startId);
        Log.d(TAG, "onStartCommand" + intent.getAction());
        if (intent.getAction().equals(SERVICE_FORCE)) {
            LOCATION_APROVAL = true;
            if (mLastKnownPosition != null) {
                mTimeAproving.run();
            }
        } else if (intent.getAction().equals(SERVICE_START)) {
            mUpdatingTimer.scheduleAtFixedRate(mTimeAproving, 0, PERIOD_BETWEEN_UPDATING);
        } else if (intent.getAction().equals(SERVICE_STOP)) {
            LOCATION_APROVAL = false;
            mLastKnownPosition = null;
            mUpdatingTimer.cancel();
            mUpdatingTimer.purge();
        }
        return START_STICKY;
    }

提前谢谢你。

Answer 1

您的应用和服务被终止，然后服务在您使用 START_STICKY 标志时重新启动。在这种情况下，传递给 onStartCommand() 的 intent 将为空。参见 Reasons that the passed Intent would be NULL in onStartCommand

根据您的逻辑，您可以考虑返回 START_REDELIVER_INTENT。