如何使用EventBus？

Question

在我的应用程序中，我希望使用EventBus，并添加了这个依赖项 implementation 'org.greenrobot:eventbus:3.1.1'。

我写了下面的代码，但当运行应用程序显示我强制关闭错误和关闭应用程序！

我的Java代码：

@Subscribe(threadMode = ThreadMode.MAIN)
public void subscribeCancel() {
    prefsUtils.setToShared_BOOL(PrefsKeys.IS_PREMIUM_USER.name(), false);
    navHeader_VipLayout.setVisibility(View.GONE);
    navHeader_notVipLayout.setVisibility(View.VISIBLE);
}

@Override
public void onStart() {
    super.onStart();
    EventBus.getDefault().register(this);
}

@Override
public void onStop() {
    super.onStop();
    EventBus.getDefault().unregister(this);
}

显示行的错误：EventBus.getDefault().register(this);

LogCat错误：

Process: com.app.test, PID: 859
                                                               java.lang.RuntimeException: Unable to start activity ComponentInfo{com.app.test/com.app.test.activity.MainActivity2}: org.greenrobot.eventbus.EventBusException: Subscriber class com.app.test.activity.MainActivity2 and its super classes have no public methods with the @Subscribe annotation
                                                                   at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2984)
                                                                   at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3045)
                                                                   at android.app.ActivityThread.-wrap14(ActivityThread.java)
                                                                   at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1642)
                                                                   at android.os.Handler.dispatchMessage(Handler.java:102)
                                                                   at android.os.Looper.loop(Looper.java:154)
                                                                   at android.app.ActivityThread.main(ActivityThread.java:6776)
                                                                   at java.lang.reflect.Method.invoke(Native Method)
                                                                   at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1518)
                                                                   at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1408)
                                                                Caused by: org.greenrobot.eventbus.EventBusException: Subscriber class com.app.test.activity.MainActivity2 and its super classes have no public methods with the @Subscribe annotation
                                                                   at org.greenrobot.eventbus.SubscriberMethodFinder.findSubscriberMethods(SubscriberMethodFinder.java:67)
                                                                   at org.greenrobot.eventbus.EventBus.register(EventBus.java:140)
                                                                   at com.app.test.activity.MainActivity2.onStart(MainActivity2.java:759)
                                                                   at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1256)
                                                                   at android.app.Activity.performStart(Activity.java:6973)

我怎么才能修好它？请帮帮我

Answer 1

您错过了onMessageEvent，将其添加到Activity中。这里，MessageEvent是一个模态类，它与事件一起传递。

@Subscribe(threadMode = ThreadMode.MAIN)  
public void onMessageEvent(MessageEvent event) {/* Do something */};

它是从激发事件中获得传递数据的方法。