安卓主动发数据到uniapp界面

业务场景：
安卓原生混合app（uniapp），当安卓的sdk有数据回调的时候，uniapp那边怎么实时获取到呢？不是只能通过调用函数的方式获取回调结果的，还有另一种方法，就是使用监听。
在uniapp的页面，我们可以建立监听：

			let myEventManager = plus.android.importClass('com.clj.fastble.MyEventManager');
			this.eventManager = myEventManager.getMyEventManager();
			
			//新建监听器
			this.myListener = plus.android.implements('com.clj.fastble.MyListener', {
				onChange: function(event) {
					//获取数据
					//导入类
					plus.android.importClass(event);
					console.log(event.getData(), '=====');
				}
			});
			
			//添加监听器
			this.eventManager.addListener('onShowXX', this.myListener);

在安卓代码那里，创建对应的监听：
MyEvent.java

public class MyEvent  {

    //数据
    private  Object data;

    //事件来源  字符串
    private  String source;

    //触发对象
    private  Object  trigger;

    public MyEvent(Object data) {
        this.data = data;
    }

    public Object getTrigger() {
        return trigger;
    }

    @Override
    public String toString() {
        return "MyEvent{" +
                "data=" + data +
                ", source='" + source + '\'' +
                ", trigger=" + trigger +
                '}';
    }

    public void setTrigger(Object trigger) {
        this.trigger = trigger;
    }

    public MyEvent(Object data, String source) {
        this.data = data;
        this.source = source;
    }

    public MyEvent() {
    }

    public Object getData() {
        return data;
    }

    public void setData(Object data) {
        this.data = data;
    }

    public String getSource() {
        return source;
    }

    public void setSource(String source) {
        this.source = source;
    }
}

MyListener.java

import java.util.EventListener;

public  interface MyListener  extends EventListener {
    void onChange(MyEvent myEvent);
}

MyEventManager.java

/***
 * 自定义事件管理类
 */
public class MyEventManager {
    private static MyEventManager myEventManager;

    private Map<String, Collection<MyListener>> listeners;

    /**
     * 不能外部 new  实例化
     */
    private MyEventManager() {
        this.listeners = new HashMap<String, Collection<MyListener>>();
    }

    /**
     * 返回监听 总数
     *
     * @return
     */

    public int getSize() {
        int size = 0;
        for (String str : listeners.keySet()) {
            size = size + listeners.get(str).size();

        }
        return size;
    }

    public Map<String, Collection<MyListener>> getListeners() {

        return listeners;
    }

    /**
     * 单例模式
     *
     * @return
     */
    public static MyEventManager getMyEventManager() {
        if (myEventManager == null) {
            synchronized (MyEventManager.class) {
                if (myEventManager == null) {
                    myEventManager = new MyEventManager();
                }
            }
        }
        return myEventManager;
    }

    /***
     * 添加事件
     * @param listener    事件对象
     * @param source      来源
     */
    public MyListener addListener(MyListener listener, String source) {

        if (listener != null && source != null) {
            Collection<MyListener> myListeners = listeners.get(source);

            if (myListeners == null) {
                myListeners = new HashSet<MyListener>();
                listeners.put(source, myListeners);
            }
            myListeners.add(listener);

        }
        return listener;

    }

    /***
     * 添加事件
     *  @param source      来源
     * @param listener    事件对象
     */
    public MyListener addListener(String source, MyListener listener) {

        return addListener(listener, source);

    }

    /**
     * 移除监听
     *
     * @param listener
     */
    public  void removeListener(MyListener listener) {
        if (listeners == null || listener == null) {
            return;
        }

        //变量所有  找出相同的  删除
        for (String str : listeners.keySet()) {

            Collection collection = listeners.get(str);
            Iterator<MyListener> iter = collection.iterator();
            while (iter.hasNext()) {
                MyListener next = (MyListener) iter.next();
                if (next == listener) {
                    collection.remove(next);
                    return;
                }
            }
        }

    }

    /***
     *   发送数据
     * @param data   数据
     * @param source 来源
     * @return
     */
    public static MyEvent postMsg(Object data, String source) {
        MyEventManager myEventManager = MyEventManager.getMyEventManager();
        MyEvent myEvent = new MyEvent(data);
        myEvent.setSource(source);
        if (myEventManager.listeners == null)

            return myEvent;
        myEventManager.notifyListeners(myEvent, myEvent.getSource());
        return myEvent;
    }

    /**
     * 通知所有的myListener    相同的 (source) 来源才通知
     */
    private void notifyListeners(MyEvent event, String source) {

        //取出  key为source 的  监听器集合
        Collection<MyListener> collection = listeners.get(source);

//        Log.i(MyEventManager.class.getName(), source + "--->" + event.getData());

        if (collection == null) {
            return;
        }
        //遍历监听器集合
        Iterator<MyListener> iter = collection.iterator();
        while (iter.hasNext()) {
            MyListener next = iter.next();
            //通知回调
            next.onChange(event);
        }

        //销毁事件对象
        event = null;
    }

}

使用方式：

在需要推送的位置使用

 MyEventManager.postMsg("一粒程序米","onShowXX");//刺激强度

这样，前端那边打印店结果就是

一粒程序米，=====

当然，也要记得移除监听，当不需要这个监听的时候，就移除

在uniapp那边

	beforeDestroy() {
		this.eventManager.removeListener(this.myListener);
	},

学会了吗