使用EventBus的模型视图演示器，如何将事件返回给演示者？
使用EventBus的模型视图演示器，如何将事件返回给演示者？
提问于 2015-08-21 21:56:36
我使用的模型-视图演示者设计模式与一个EventBus (Otto)。我实现此模式的全部原因是只将事件解耦给演示者，并让演示者更新视图。
这是我有的一些代码的一个例子，我将以获取Events为例。(请注意，Events与EventBus Event不同，意思是Events中的Event是一个类似于“爸爸生日”的事件，而EventBus中的Event是一个总线事件)。
片段
public class EventFragment extends Fragment {
private EventPresenter mEventPresenter;
// Initialize boilerplate code...
private void init() {
mEventPresenter = new EventPresenter();
mEventPresenter.loadEvents();
}
// I WANT TO MOVE THESE SUBSCRIPTION METHODS TO
// MY PRESENTER OR SUBSCRIBER, BUT THEY ARE
// COUPLED TO THE ADAPTER OR A VIEW
@Subscribe
public void onEventsLoaded(EventsLoaded eventsLoaded) {
List<Event> events = eventsLoaded.getEvents();
mAdapter.setEvents(events);
}
@Subscribe
public void onEventJoined(EventJoined eventJoined) {
mItemView.doAnimation();
mTextView.setText("Leave");
mAdapter.joinEvent(eventJoined.getEvent());
}
@Subscribe
public void onLeaveEvent(LeftEvent leftEvent) {
mItemView.doAnimation();
mTextView.setText("Join");
mAdapter.leftEvent(leftEvent.getEvent());
}
}演示者
public class EventPresenter {
// This is the only method I have right now kind of defeats the purpose of
// having a presenter
public void loadEvents() {
EventBus.getInstance().post(new LoadEvents());
}
}用户
public class EventSubscriber extends Subscriber {
// This class is registered on the event bus
@Subscribe
public void onLoadEvents(LoadEvents loadEvents) {
sClient.getEvents(new Callback<List<Event>>() {
@Override
public void onSuccess(List<Event> events, Response response) {
EventBus.post(new EventsLoaded(events));
}
@Override
public void onFailure(.....) {
// Handle failure
}
};
}
}如何让演示人员和订阅者处理所有业务逻辑，并使片段只处理视图？
回答 2
Stack Overflow用户
回答已采纳
发布于 2015-08-21 22:42:00
这不是最好的可能，但可能会帮助你。
在演示程序中订阅事件，其中包含一个视图实例可以帮助您。就像演示者从事件总线获取事件并调用适当的视图方法来更新UI一样。
请注意，我没有更改您的片段的方法名，它更新UI并直接从演示者那里传递事件对象，现在它确实是事件总线事件的订阅者。您可以相应地更改它。
碎片--
public class EventFragment extends Fragment {
private EventPresenter mEventPresenter;
// Initialize boilerplate code...
@Override
public void onResume()
{
mEventPresenter.onResume();
}
@Override
public void onPause()
{
mEventPresenter.onPause();
}
private void init() {
mEventPresenter = new EventPresenter(this);
mEventPresenter.loadEvents();
}
// I WANT TO MOVE THESE SUBSCRIPTION METHODS TO
// MY PRESENTER OR SUBSCRIBER, BUT THEY ARE
// COUPLED TO THE ADAPTER OR A VIEW
public void onEventsLoaded(EventsLoaded eventsLoaded) {
List<Event> events = eventsLoaded.getEvents();
mAdapter.setEvents(events);
}
public void onEventJoined(EventJoined eventJoined) {
mItemView.doAnimation();
mTextView.setText("Leave");
mAdapter.joinEvent(eventJoined.getEvent());
}
public void onLeaveEvent(LeftEvent leftEvent) {
mItemView.doAnimation();
mTextView.setText("Join");
mAdapter.leftEvent(leftEvent.getEvent());
}
}主持人
public class EventPresenter {
private EventFragment targetView;
public EventPresenter(EventFragment myView)
{
targetView = myView;
}
// This is the only method I have right now kind of defeats the purpose of
// having a presenter
public void loadEvents() {
EventBus.getInstance().post(new LoadEvents());
}
@Subscribe
public void onEventsLoaded(EventsLoaded eventsLoaded) {
targetView.onEventsLoaded(eventsLoaded);
}
@Subscribe
public void onEventJoined(EventJoined eventJoined) {
targetView.onEventJoined(eventJoined);
}
@Subscribe
public void onLeaveEvent(LeftEvent leftEvent) {
targetView.onLeaveEvent(leftEvent);
}
public void onResume()
{
//subscride event bus
}
public void onPause()
{
//unsubscride event bus
}
}Stack Overflow用户
发布于 2015-08-21 22:21:09
这是对主持人发送或接收事件以及在通知片段或活动之后的响应性。
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/32152876
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