EventBus

最新推荐文章于 2024-04-17 09:37:06 发布

Mike_8859

最新推荐文章于 2024-04-17 09:37:06 发布

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本文链接：https://blog.youkuaiyun.com/Mike_chao/article/details/78916025

本文介绍了一种在Android应用中使用的轻量级事件发布/订阅框架EventBus的使用方法。通过MainActivity与SecodeActivity之间的交互实例，展示了如何利用EventBus进行跨Activity的消息传递。

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//导入依赖

compile 'org.greenrobot:eventbus:3.0.0'

MainActivity

package bwie.com.eventbus;

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

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

public class MainActivity extends AppCompatActivity {

    private Button btn;
    private TextView tv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //注册(在接收消息的页面进行注册)
        EventBus.getDefault().register(this);

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

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(getApplicationContext(),SecodeActivity.class);
                startActivity(intent);
            }
        });
    }
    //设置订阅者(如果出不来加 Sticky=true)
    @Subscribe(threadMode = ThreadMode.MAIN)
    public void onEventMainThread(FirstEvent event) {

        String msg = "onEventMainThread收到了消息：" + event.getMsg();
       // Log.d("harvic", msg);
        tv.setText(msg);
        Toast.makeText(this, msg, Toast.LENGTH_LONG).show();
    }

 解除注册
    @Override
    protected void onDestroy() {
        super.onDestroy();
        //反注册EventBus
        EventBus.getDefault().unregister(this);
    }
}

//新建一个类FirstEvent

package bwie.com.eventbus;


public class FirstEvent {
    private String msg;

    public FirstEvent(String msg) {
        this.msg = msg;
    }

    public String getMsg(){
        return msg;
    }
}

//回传消息

SecodeActivity

package bwie.com.eventbus;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

import org.greenrobot.eventbus.EventBus;

public class SecodeActivity extends AppCompatActivity {

    private Button btn;

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

        btn = (Button) findViewById(R.id.frist_btn);


        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                EventBus.getDefault().post(new FirstEvent("你好,世界"));
            }
        });
    }
}