RxBus、RxJava简单使用

public class RxBus {
    private volatile static RxBus mDefaultInstance;
    private final Subject<Object> mBus;

    private final Map<Class<?>, Object> mStickyEventMap;

    public RxBus() {
        mBus = PublishSubject.create().toSerialized();
        mStickyEventMap = new ConcurrentHashMap<>();
    }

    public static RxBus getInstance() {
        if (mDefaultInstance == null) {
            synchronized (RxBus.class) {
                if (mDefaultInstance == null) {
                    mDefaultInstance = new RxBus();
                }
            }
        }
        return mDefaultInstance;
    }

    /**
     * 发送事件
     */
    public void post(Object event) {
        mBus.onNext(event);
    }

    /**
     * 根据传递的 eventType 类型返回特定类型(eventType)的 被观察者
     */
    public <T> Observable<T> toObservable(final Class<T> eventType) {
        return mBus.ofType(eventType);
    }

    /**
     * 判断是否有订阅者
     */
    public boolean hasObservers() {
        return mBus.hasObservers();
    }

    public void reset() {
        mDefaultInstance = null;
    }

    /**
     * Stciky 相关
     */

    /**
     * 发送一个新Sticky事件
     */
    public void postSticky(Object event) {
        synchronized (mStickyEventMap) {
            mStickyEventMap.put(event.getClass(), event);
        }
        post(event);
    }

    /**
     * 根据传递的 eventType 类型返回特定类型(eventType)的 被观察者
     */
    public <T> Observable<T> toObservableSticky(final Class<T> eventType) {
        synchronized (mStickyEventMap) {
            Observable<T> observable = mBus.ofType(eventType);
            final Object event = mStickyEventMap.get(eventType);

            if (event != null) {
                return observable.mergeWith(Observable.create(new ObservableOnSubscribe<T>() {
                    @Override
                    public void subscribe(ObservableEmitter<T> subscriber) throws Exception {
                        subscriber.onNext(eventType.cast(event));
                    }
                }));
            } else {
                return observable;
            }
        }
    }

    /**
     * 根据eventType获取Sticky事件
     */
    public <T> T getStickyEvent(Class<T> eventType) {
        synchronized (mStickyEventMap) {
            return eventType.cast(mStickyEventMap.get(eventType));
        }
    }

    /**
     * 移除指定eventType的Sticky事件
     */
    public <T> T removeStickyEvent(Class<T> eventType) {
        synchronized (mStickyEventMap) {
            return eventType.cast(mStickyEventMap.remove(eventType));
        }
    }

    /**
     * 移除所有的Sticky事件
     */
    public void removeAllStickyEvents() {
        synchronized (mStickyEventMap) {
            mStickyEventMap.clear();
        }
    }


    /**
     * 普通订阅解绑
     * @param disposable
     */
    public static   void  rxBusUnbund(CompositeDisposable  disposable){
        if (null != disposable && !disposable.isDisposed()) {
            disposable.clear();
        }
    }
}

消息发送

RxBus.getInstance().post(new SetShoppingGoodsCount(Run.goodsCounts));

消息接收

 compositeDisposable = new CompositeDisposable();
        RxBus.getInstance().toObservable(SetShoppingGoodsCount.class)
                .subscribe(new Observer<SetShoppingGoodsCount>() {
                    @Override
                    public void onSubscribe(Disposable d) {
                        compositeDisposable.add(d);
                    }

                    @Override
                    public void onNext(SetShoppingGoodsCount setShoppingGoodsCount) {
                        setShoppingCarCountWithoutAnimation(setShoppingGoodsCount.getCount());
                    }

                    @Override
                    public void onError(Throwable e) {

                    }

                    @Override
                    public void onComplete() {

                    }
                });

解绑

 @Override
    protected void onDestroy() {
        super.onDestroy();
        RxBus.rxBusUnbund(compositeDisposable);
    }

volatile
https://www.jianshu.com/p/71ab00a2677b
https://blog.csdn.net/senkai123/article/details/78202217
https://blog.csdn.net/donkor_/article/details/79709366