RxBus工具类

首先，在gradle中依赖

compile 'io.reactivex:rxandroid:1.2.0'

import rx.Observable;
import rx.functions.Func1;
import rx.subjects.PublishSubject;
import rx.subjects.SerializedSubject;
import rx.subjects.Subject;

/**
 * Created by xiaguangcheng on 16/5/17.
 */
public class RxBus {
    /**
     * 参考网址: http://hanhailong.com/2015/10/09/RxBus%E2%80%94%E9%80%9A%E8%BF%87RxJava%E6%9D%A5%E6%9B%BF%E6%8D%A2EventBus/
     *          http://www.loongwind.com/archives/264.html
     *          https://theseyears.gitbooks.io/android-architecture-journey/content/rxbus.html
     */
    private static volatile RxBus mDefaultInstance;

    private RxBus() {
    }

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

    private final Subject _bus = new SerializedSubject<>(PublishSubject.create());

    public void send(Object o) {
        _bus.onNext(o);
    }

    public Observable