Android EventBus使用,粘性事件postSticky使用

源码下载：

https://download.csdn.net/download/qq_31939617/10508747 下载

1.在Android studio中新建一个项目，配置build.gradle, 添加compile ‘org.greenrobot:eventbus:3.0.0’，然后Sync Now，下载eventbus需要的文件;**

2.注册，取消eventbus

// 注册EventBus
EventBus.getDefault().register(this);

//取消EventBus
EventBus.getDefault().unregister(this);

3.开始编写events,所谓的Events其实就是一个普通的Java对象；

package com.example.sz.eventbustest;

public class FristEvent {

    private String type;

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public String getStr() {
        return str;
    }

    public void setStr(String str) {
        this.str = str;
    }

    private String str ;

    public void  FristEvent( String type, String str){
        this.type = type;
        this.str = str;
    }


}

MainActivity.class

package com.example.sz.eventbustest;

import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        TextView tv = findViewById(R.id.tv);

        tv.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                //发送消息,
                //一般用 post发送， @Subscribe接收就可以了
                // 此处因为发送消息的时候，SecondActivity还没启动，所以必须用粘性事件postSticky发送
               // 所以接收的时候必须用粘性事件接收@Subscribe(threadMode= ThreadMode.MAIN,sticky=true)
                String type = "s";
                EventBus.getDefault().postSticky(new FristEvent(type,"Hello"));

                startActivity(new Intent(MainActivity.this,SecondActivity.class));
            }
        });

    }
}

SecondActivity .class

package com.example.sz.eventbustest;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.TextView;

import org.greenrobot.eventbus.EventBus;
import org.greenrobot.eventbus.Subscribe;
import org.greenrobot.eventbus.ThreadMode;

public class SecondActivity extends AppCompatActivity {
private static final String TAG = “SecondActivity”;
TextView tv;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_second);

    tv = findViewById(R.id.tv);
    // 注册EventBus
    EventBus.getDefault().register(this);
}

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

//发送消息,
//一般用 post发送， @Subscribe接收就可以了
// 此处因为发送消息的时候，SecondActivity还没启动，所以必须用粘性事件postSticky发送
// 所以接收的时候必须用粘性事件接收@Subscribe(threadMode= ThreadMode.MAIN,sticky=true)
@Subscribe(threadMode= ThreadMode.MAIN,sticky=true)
public void onEvent(FristEvent event) {

    String type = event.getType();

    if (type.equals("s")) {
       String str = event.getStr();
        tv.setText(str);


    }
}

}
“`

源码下载：

https://download.csdn.net/download/qq_31939617/10508747 下载