java - 如何将EventBus设置到fragment中

Question

我正在试验EventBus libaray。我刚刚将其注册到 Fragment 中，并使用 public 方法在该 fragment 中使用了 @Subcride 注释，但是当我运行应用程序时，我收到异常，表明我没有使用@Subcribe 注释与 super 类中的 public 方法。为什么我需要在 super 类中声明它？如何解决这个问题这是我第一次使用 EventBus

这是代码

fragment

public class SignUpFragment extends BaseFragment {
Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    View layout = inflater.inflate(R.layout.fragment_sign_up, container, false);
    ButterKnife.bind(this, layout);
    return layout;
}

// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(String uri) {
    if (mListener != null) {
        mListener.onSignUpFragmentInteraction(uri);
    }
}

@Override
public void onAttach(Context context) {
    super.onAttach(context);
    EventBus.getDefault().register(getActivity()); // Here comes the exception
    if (context instanceof OnSignUpFragmentInteractionListener) {
        mListener = (OnSignUpFragmentInteractionListener) context;
    } else {
        throw new RuntimeException(context.toString()
                + " must implement OnSignUpFragmentInteractionListener");
    }
}

@Override
public void onDetach() {
    super.onDetach();
    EventBus.getDefault().unregister(getActivity());
    mListener = null;
}
@Subscribe(threadMode = ThreadMode.MAIN)
public void onEvent(JSONObject response) {

    Log.d(TAG, response.toString());

}

@Subscribe(threadMode = ThreadMode.MAIN)
public void onEvent(VolleyError error) {
    Log.d(TAG, error.toString());
}
}

这是我遇到的异常

10-31 11:01:46.172 9047-9047/com.aam.skillschool E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.aam.skillschool, PID: 9047
org.greenrobot.eventbus.EventBusException: Subscriber class com.aam.skillschool.ui.activities.MainActivity 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:136)
at com.aam.skillschool.ui.fragments.SignUpFragment.onAttach(SignUpFragment.java:113)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1048)
at android.support.v4.app.BackStackRecord.setLastIn(BackStackRecord.java:838)
at android.support.v4.app.BackStackRecord.calculateFragments(BackStackRecord.java:878)
at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:719)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1682)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:541)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:154)
at android.app.ActivityThread.main(ActivityThread.java:6077)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:865)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:755)

Answer 1

不要将 getActivity() 传递给 EventBus register() 方法，而是传递 Fragment，在本例中应该是 this