RxJava作为事件总线?

问题描述

我开始学习RxJava，到目前为止我喜欢它.我有一个片段，它与单击按钮时的活动进行通信(用新片段替换当前片段).Google建议使用界面来使片段与活动进行交流，但是它太冗长，我尝试使用广播接收器虽然可以正常工作，但是有缺点.

I'm start learning RxJava and I like it so far. I have a fragment that communicate with an activity on button click (to replace the current fragment with a new fragment). Google recommends interface for fragments to communicate up to the activity but it's too verbose, I tried to use broadcast receiver which works generally but it had drawbacks.

由于我正在学习RxJava，所以我想知道从片段到活动(或片段到片段)进行通信是否是一个好选择?如果是这样，那么使用RxJava进行此类通信的最佳方法是什么?我是否需要像这样一个，如果是这种情况，我应该制作一个总线实例并在全局范围内使用它(带有主题)吗?

Since I'm learning RxJava I wonder if it's a good option to communicate from fragments to activities (or fragment to fragment)?. If so, whats the best way to use RxJava for this type of communication?. Do I need to make event bus like this one and if that's the case should I make a single instance of the bus and use it globally (with subjects)?

推荐答案

是的，在您学习了如何做之后，这真是太了不起了.考虑以下单例类:

Yes and it's pretty amazing after you learn how to do it. Consider the following singleton class:

public class UsernameModel {

    private static UsernameModel instance;

    private PublishSubject<String> subject = PublishSubject.create();

    public static UsernameModel instanceOf() {
        if (instance == null) {
            instance = new UsernameModel();
        }
        return instance;
    }

    /**
     * Pass a String down to event listeners.
     */
    public void setString(String string) {
        subject.onNext(string);
    }

    /**
     * Subscribe to this Observable. On event, do something e.g. replace a fragment
     */
    public Observable<String> getStringObservable() {
        return subject;
    }

}

在您的活动"中准备接收事件(例如，将其放在onCreate中):

In your Activity be ready to receive events (e.g. have it in the onCreate):

UsernameModel usernameModel = UsernameModel.instanceOf();

//be sure to unsubscribe somewhere when activity is "dying" e.g. onDestroy
subscription = usernameModel.getStringObservable()
        .subscribe(s -> {
            // Do on new string event e.g. replace fragment here
        }, throwable -> {
            // Normally no error will happen here based on this example.
        });

在您的Fragment中，发生事件时将其传递:

In you Fragment pass down the event when it occurs:

UsernameModel.instanceOf().setString("Nick");

您的活动将会有所作为.

Your activity then will do something.

提示1:使用所需的任何对象类型更改字符串.

Tip 1: Change the String with any object type you like.

提示2:如果您有依赖项注入，它也很好用.

Tip 2: It works also great if you have Dependency injection.

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