Question

我面临Android 8.1 OS中带有Signed apk的JobIntentService的问题。在哪里可以正常使用调试版本。尝试了很多事情，但无法获得解决方案。这是我从Crashalytics获得的崩溃日志。

java.lang.RuntimeException: Unable to stop service com.app.xmpp.XmppService@241c51c6: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.JobIntentService$WorkEnqueuer.serviceProcessingFinished()' on a null object reference

        at android.app.ActivityThread.handleStopService(ActivityThread.java:3284)

        at android.app.ActivityThread.access$2300(ActivityThread.java:188)

        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1633)

        at android.os.Handler.dispatchMessage(Handler.java:111)

        at android.os.Looper.loop(Looper.java:210)

        at android.app.ActivityThread.main(ActivityThread.java:5839)

        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:1113)

        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:879)

     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.support.v4.app.JobIntentService$WorkEnqueuer.serviceProcessingFinished()' on a null object reference
        at android.support.v4.app.JobIntentService.onDestroy(JobIntentService.java:479)
        at com.app.xmpp.XmppService.onDestroy(XmppService.java:91)
        at android.app.ActivityThread.handleStopService(ActivityThread.java:3265)
        at android.app.ActivityThread.access$2300(ActivityThread.java:188) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1633) 
        at android.os.Handler.dispatchMessage(Handler.java:111) 
        at android.os.Looper.loop(Looper.java:210) 
        at android.app.ActivityThread.main(ActivityThread.java:5839) 
        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:1113)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:879)

如果有人在JobIntentService中遇到类似问题，请帮帮我。

请注意，处理Nullpointer异常无法解决此问题，因为NPE发生在Android Framework的JobIntentService中，我们无法对其进行修改，并且尤其是在Signed APK中发生。

XMPP Service OnDestroy

@Override
    public void onDestroy() {
        super.onDestroy();

        MyXMPP.instance=null;
        MyXMPP.instanceCreated=false;

        MyXMPP.connection.disconnect();
        xmppConnectionCheckHandler.removeCallbacks(xmppConnectionCheckRunnable);

        System.out.println("--------------Xmpp Service Stopped-----------");
    }

谢谢。

Answer 1

来自JobIntentService类：

@Override
public void onDestroy() {
    super.onDestroy();
    if (mCompatQueue != null) {
        synchronized (mCompatQueue) {
            mDestroyed = true;
            mCompatWorkEnqueuer.serviceProcessingFinished(); //line 479
        }
    }
}

@Override
public void onCreate() {
    super.onCreate();
    if (DEBUG) Log.d(TAG, "CREATING: " + this);
    if (Build.VERSION.SDK_INT >= 26) {
        mJobImpl = new JobServiceEngineImpl(this);
        mCompatWorkEnqueuer = null;
    } else {
        mJobImpl = null;
        ComponentName cn = new ComponentName(this, this.getClass());
        mCompatWorkEnqueuer = getWorkEnqueuer(this, cn, false, 0);
    }
}

您对子类中的mCompatWorkEnqueuer或mCompatQueue执行任何操作吗？是说要像将其设置为null或super.onCreate()调用吗？

请注意，第479行的执行取决于mCompatQueue值的存在。此外，对于API的26（8.0）及更高版本，mCompatWorkEnqueuer中的null设置为onCreate

JobIntentService onDestroy中的空指针异常

1 个答案: