深圳横岗网站建设/seo的研究对象
以前的项目中使用的是EventBus来实现事件的通知和订阅,RxJava2发布之后就使用了新的方式:RxBus,减少添加的依赖库。如果有什么错误的地方,或者有更好的建议的欢迎大家在下边留言,互相学习。
没有背压处理(Backpressure)的 RxBus
import android.support.annotation.NonNull;import io.reactivex.Observable;
import io.reactivex.subjects.PublishSubject;
import io.reactivex.subjects.Subject;public class RxBus {private final Subject<Object> mBus;private RxBus() {mBus = PublishSubject.create().toSerialized();}public static RxBus getInstance() {return Holder.BUS;}public void post(@NonNull Object obj) {mBus.onNext(obj);}public <T> Observable<T> register(Class<T> tClass) {return mBus.ofType(tClass);}public Observable<Object> register() {return mBus;}public boolean hasObservers() {return mBus.hasObservers();}public void unregisterAll() {//会将所有由mBus生成的Observable都置completed状态,后续的所有消息都收不到了mBus.onComplete();}private static class Holder {private static final RxBus BUS = new RxBus();}}
有背压(Backpressure)处理的RxBus:
import android.support.annotation.NonNull;import io.reactivex.Flowable;
import io.reactivex.processors.FlowableProcessor;
import io.reactivex.processors.PublishProcessor;public class RxBus {private final FlowableProcessor<Object> mBus;private RxBus() {mBus = PublishProcessor.create().toSerialized();}private static class Holder {private static RxBus instance = new RxBus();}public static RxBus getInstance() {return Holder.instance;}public void post(@NonNull Object obj) {mBus.onNext(obj);}public <T> Flowable<T> register(Class<T> clz) {return mBus.ofType(clz);}public Flowable<Object> register() {return mBus;}public void unregisterAll() {//会将所有由mBus生成的Flowable都置completed状态后续的所有消息都收不到了mBus.onComplete();}public boolean hasSubscribers() {return mBus.hasSubscribers();}
}
在发送消息的activity中代码:
RxBus.getInstance().post("111");
在接收消息的activity中代码:
RxBus.getInstance().register(String.class).subscribe(new Consumer<String>() {@Overridepublic void accept(String integer) throws Exception {toast(integer);}
});
像上边直接传基本数据类型在实际项目中不推荐这样使用。我们可以自定义消息类(或者直接传JavaBean),例如:
public class MsgEvent<T> {private T data;private String mMsg;private int type;private int request;public MsgEvent(T data) {this.data = data;}public MsgEvent(int request, int type, String msg) {this.type = type;this.mMsg = msg;this.request = request;}public String getMsg(){return mMsg;}public int getType(){return type;}public int getRequest(){ return request; }public T getData(){return data;}}
在发送消息的时候,自己定义消息:
RxBus.getInstance().post(new MsgEvent(11,45,"今天天气很好"));
在接收消息的时候,选择性接收消息:
RxBus.getInstance().register(MsgEvent.class).subscribe(new Consumer<MsgEvent>() {@Overridepublic void accept(MsgEvent msg) throws Exception {if (msg.getRequest() == 11) {tv.setText(msg.getMsg());}}});
这里说明一下unregisterAll()方法,这个方法一旦调用了以后,所有的消息都是收不到的,所以如果要调用的话,建议在退出程序的Activity里面调用。
public void unregisterAll() {//会将所有由mBus生成的Observable都置completed状态,后续的所有消息都收不到了mBus.onComplete();}
效果图:
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