Notify.java

package com.cheng.bestpractice.observer.util;

import com.cheng.bestpractice.observer.observer.impl.EventSubject;

/**
 * 通知中心，用来通知更新数据或者UI，采用单例模式
 */
public class Notify {

    private static volatile Notify mNotify;
    private Notify(){

    }

    public static Notify getInstance(){
        if(mNotify==null){
            mNotify=new Notify();
        }
        return mNotify;
    }

    public void NotifyActivity(String eventType){
        EventSubject eventSubject = EventSubject.getInstance();
        EventType eventTypes=EventType.getInstance();
        if(eventTypes.contains(eventType)){
            eventSubject.notifyObserver(eventType);
        }
    }
}