Android EventBus使用大全

添加依赖

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("哈哈哈"));

    }

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

    /**
     * 注册普通事件
     * @param wrap
     */
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void MyMessage(MessageWrap wrap){
        Toast.makeText(this,wrap.message.toString(),Toast.LENGTH_LONG).show();
    }

    /**
     * 注册粘性事件
     * 粘性事件表示，我可以直接发送，等到我想要接收的时候，我在订阅他
     * @param 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");
        String txt = "Sticky event: " + message.message;
        Toast.makeText(this,txt,Toast.LENGTH_LONG).show();
        if (stopDelivery) {
            // 终止事件的继续分发
            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！