《Android进阶之光》--RxJava实现RxBus
事件总线RxBus,替代EventBus和otto
1)创建RxBus
public class RxBus{ private static volatile RxBus rxBus; private final Subject<Object,Object> subject = new SerializedSubject<>(PublishSubject.create()); private RxBus(){ } public static RxBus getInstance(){ if(rxBus == null){ synchronized(RxBus.class){ if(rxBus == null){ rxBus = new RxBus(); } } } return rxBus; } public void post(Object ob){ subject.onNext(ob); } public <T> Observalbe<T> toObservable(Class<T> eventType){ return subject.ofType(eventType); } }
public final <R> Observable<R> ofType(final Class<R> klass){ return filter(InternalObservableUtils.isInstanceOf(klass)).cast(klass); }
2)发送事件
public class RxBusActivity extends AppComaptActivity{ private Button bt_post; @Override protected void onCreate(Bundle savedInstanceState){ super.onCreate(savedInstanceState); setContentView(R.layout.activity_rx_bus); bt_post = (Button)this.findViewById(R.id.bt_post); bt_post.setOnClickListener(new View.OnClickListener(){ @Override public void onClick(View v){ RxBus.getInstance().post(new MessageEvent("用RxJava实现RxBus")); } }); } }
3)接收事件
public class RxBusFragment extends Fragment{ ... @Override public void onActivityCreated(@Nullable Bundle savedInstanceState){ super.onActivityCreated(savedInstanceState); subscription = RxBus.getInstance().toObservable(MessageEvent.class).subscribe(new Action1<MessageEvent>(){ @Override public void call(MessageEvent messageEvent){ if(messageEvent!=null){ tv_text.setText(messageEvent.getMessage()); } } }); } }
4)取消订阅事件
@Override public void onDestroy(){ super.onDestroy(); if(subscription!=null&&!subscription.isUnsubscribed()){ subscription.unsubscribe(); } }