I am trying to develop an app using Mosby and EventBus. First event I want to have is after user login, creating a sticky event so every screen can access Login info at all times.
Based off the Mosby mail sample, I have a BasePresenter like this:
public abstract class EventBusPresenter<V extends MvpView> extends MvpBasePresenter<V> {
private static final java.lang.String TAG = tag(EventBusPresenter.class);
@Inject
protected EventBus mEventBus;
LoginSuccessfulEvent userInfo;
@Subscribe(sticky = true, threadMode = ThreadMode.MAIN)
public void onLoginSuccessful(LoginSuccessfulEvent event) {
MCLog.i(TAG, "Received a login event!");
userInfo = event;
onLoginReceived(event);
}
protected abstract void onLoginReceived(LoginSuccessfulEvent e);
public LoginSuccessfulEvent getUserInfo(){
return userInfo;
}
@Override
public void attachView(V view) {
super.attachView(view);
mEventBus.register(this);
}
@Override
public void detachView(boolean retainInstance) {
super.detachView(retainInstance);
mEventBus.unregister(this);
}
}
When the user logins I use this code:
public void doLogin(String username, String password) {
if (isViewAttached()) {
getView().showLoading();
}
cancelSubscription();
mSubscriber = new Subscriber<AuthenticationResponse>() {
@Override
public void onCompleted() {
if (isViewAttached()) {
getView().loginSuccessful();
}
}
@Override
public void onError(Throwable e) {
if (isViewAttached()) {
getView().showLoginError();
}
}
@Override
public void onNext(AuthenticationResponse authenticationResponse) {
User user = authenticationResponse.getUser();
MCLog.w(TAG, String.format("Login was successful with user: %s", user) );
mEventBus.postSticky(new LoginSuccessfulEvent(user, authenticationResponse.getToken()));
String token = authenticationResponse.getToken();
MCLog.i(TAG, String.format("Token obtained = %s", token));
mSharedPreferences.edit().putString(PreferenceKeys.TOKEN_KEY, token).apply();
}
};
My idea is that for every screen, as soon as its loaded it can retrieve the UserInfo through the EventBus subscription.
The issue is -- this event arrives too son. As per mosby's own BaseFragment class I do this:
public abstract class BaseFragment<V extends MvpView, P extends MvpPresenter<V>> extends MvpFragment<V, P> {
private Unbinder mUnbinder;
@LayoutRes
protected abstract int getLayoutRes();
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
return inflater.inflate(getLayoutRes(), container, false);
}
@Override public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
inject();
super.onViewCreated(view, savedInstanceState);
mUnbinder = ButterKnife.bind(this, view);
}
@Override public void onDestroyView() {
super.onDestroyView();
mUnbinder.unbind();
}
/**
* Inject dependencies
*/
protected void inject() {
}
}
This means that injection arrives before the views are created, so whenever I try to respond to a LoginEvent being received, the UI elements that need updating are not there anymore.
How can I achieve this? Is this even the right way to do it?
