Android EventBus Compendium

Add dependent

implementation 'org.greenrobot:eventbus:3.1.1'

public class HuaDongActivity extends Activity {

    private Button nianxing;
    // 用来判断是否需要停止事件的继续分发
    private boolean stopDelivery = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_hua_dong);
        nianxing = findViewById(R.id.nianxing);
        nianxing.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                stopDelivery = true;
                EventBus.getDefault().postSticky(MessageWrap.getInstance("哈哈哈哈"));
            }
        });
        EventBus.getDefault () Register (HuaDongActivity.this);. 

        . EventBus.getDefault () POST (MessageWrap.getInstance ( "ha")); 


    } 


    @Override 
    protected void onDestroy () { 
        super.onDestroy (); 
        EventBus.getDefault () .unregister (the this); 
    } 

    / ** 
     * normal event register 
     * @param wrap 
     * / 
    @Subscribe (threadMode = ThreadMode.MAIN) 
    public void MyMessage (MessageWrap wrap) { 
        Toast.makeText (the this, wrap.message.toString (), Toast.LENGTH_LONG) .Show (); 
    } 


    / ** 
     * Register viscous event 
     * viscous event indicates, I can send directly, until the time I want to receive, and I subscribe to his 
     * @param the Message 
     * /
//    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true)
//    public void onGetStickyEvent(MessageWrap message) {
//        String txt = "Sticky event: " + message.message;
//        Toast.makeText(this,txt,Toast.LENGTH_LONG).show();
//    }

    @Subscribe(threadMode = ThreadMode.POSTING, priority = 0)
    public void onGetMessage(MessageWrap message) {
        Log.i("TAG","onGetMessage");
        Toast.makeText(this,message.message,Toast.LENGTH_LONG).show();
    }

    // 订阅方法，需要与上面的方法的threadMode一致，并且优先级略高
    @Subscribe(threadMode = ThreadMode.POSTING, sticky = true, priority = 1)
    public void onGetStickyEvent(MessageWrap message) {
        Log.i("TAG","onGetStickyEvent");
        TXT = String "Sticky Event:" + message.message; 
        Toast.makeText (the this, TXT, Toast.LENGTH_LONG) .Show (); 
        IF (stopDelivery) { 
            // terminate continue to distribute the event 
            . EventBus.getDefault () cancelEventDelivery ( Message); 
        } 
    } 
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".HuaDongActivity">

 <Button
     android:id="@+id/nianxing"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="点击发送粘性事件"
     />

</RelativeLayout>

参考自https://www.jianshu.com/p/e7d5c7bda783，感觉大佬！