[移动开发]Rxjava3.x 实现ReBus

注：app文件夹内的build.gradle 的 dependencies 添加rxjava 库

implementation 'io.reactivex.rxjava3:rxandroid:3.0.0'
implementation 'io.reactivex.rxjava3:rxjava:3.0.0'

1.创建Rxbus

首先创建RxBus ,这里的RxBus仅支持基本的功能。如下示例

import androidx.lifecycle.Observer;

import io.reactivex.rxjava3.core.Observable;
import io.reactivex.rxjava3.subjects.PublishSubject;
import io.reactivex.rxjava3.subjects.Subject;

public class Rxbus {
    private final Subject<Object> subject;
    private static volatile Rxbus rxbus;

    private Rxbus() {
        this.subject = PublishSubject.create().toSerialized();
    }

    public static Rxbus getInstance(){
        if (rxbus == null){
            synchronized (Rxbus.class){
                rxbus = new Rxbus();
            }
        }

        return rxbus;
    }

    public void post(Object ob){
        subject.onNext(ob);
    }

    public <T> Observable<T> toObservable(Class<T> eventType){
        return subject.ofType(eventType);
    }
}

2.新建发送的事件类

public class MessageEvent {
    private String message;

    public String getMessage() {
        return message;
    }

    public MessageEvent(String message){
        this.message = message;
    }
}

3.订阅事件及接收和处理

        Rxbus.getInstance().toObservable(MessageEvent.class).subscribe(new Observer<MessageEvent>() {
            @Override
            public void onSubscribe(@NonNull Disposable d) {
                用于在Activity 注销时进行取消订阅事件，防止内存泄漏
                compositeDisposable.add(d);
            }

            @Override
            public void onNext(@NonNull MessageEvent messageEvent) {
                if (messageEvent != null){
                    Log.e("TAG", "onNext: " + messageEvent.getMessage());
                }
            }

            @Override
            public void onError(@NonNull Throwable e) {

            }

            @Override
            public void onComplete() {

            }
        });

compositeDisposable 实例化方式：

compositeDisposable = new CompositeDisposable();

4.发送事件

Rxbus.getInstance().post(new MessageEvent("Rxjava 事件"));

5 Activity 销毁时，进行取消订阅

    @Override
    protected void onDestroy() {
        if (compositeDisposable != null){
            compositeDisposable.clear();
        }
        super.onDestroy();
    }

以上就是Rxjava3.x 使用RxBus 实现订阅和事件处理的方式

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