EventBus通信

 

需求：

1.ActivityA打开ActivityB

2.在B中执行某操作后，同时执行A中的方法

lib下载：eventbus-2.4.0.jar  jmmy

1.在EventBusTestActivity注册eventBus

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

2.点击事件跳转

Intent intent = new Intent(getApplicationContext(),EventBusTest2Activity.class);
startActivity(intent);

3.在EventBusTest2Activity中发送广播

EventBus.getDefault().post(new MyEvent("Message From EventBusTest2"));

4.EventBusTestActivity接收广播

// onEvent会放在发送事件的那个线程中去执行，不能进行UI更新
    public void onEvent(MyEvent event) {
        Log.i("What", "[onEvent]My Thread is "
                + Thread.currentThread().getName());
    }

// onEventMainThread就是会放到主线程去执行的事件处理，一般在其中进行比如UI的更新的操作
    public void onEventMainThread(MyEvent event) {
        Log.i("What", "[onEventMainThread] Thread is "
                + Thread.currentThread().getName());
        test1.setText("测试完成");
    }

5.解除广播

protected void onDestroy() {
　　super.onDestroy();
　　EventBus.getDefault().unregister(this);// 解除
}

下面贴上源码：

package com.example.activity;

import com.example.event.MyEvent;

import de.greenrobot.event.EventBus;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

public class EventBusTestActivity extends Activity implements OnClickListener {
    private Button test1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_event_bus_test);
        test1 = (Button) findViewById(R.id.test1);
        test1.setOnClickListener(this);
        EventBus.getDefault().register(this);// 注册广播
    }

    // onEvent会放在发送事件的那个线程中去执行，不能进行UI更新
    public void onEvent(MyEvent event) {
        Log.i("What", "[onEvent]My Thread is "
                + Thread.currentThread().getName());
    }

    // onEventMainThread就是会放到主线程去执行的事件处理，一般在其中进行比如UI的更新的操作
    public void onEventMainThread(MyEvent event) {
        Log.i("What", "[onEventMainThread] Thread is "
                + Thread.currentThread().getName());
        test1.setText("测试完成");
    }

    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.test1:
            Intent intent = new Intent(getApplicationContext(),
                    EventBusTest2Activity.class);
            startActivity(intent);
            break;
        }
    }

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

package com.example.activity;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;

import com.example.event.MyEvent;

import de.greenrobot.event.EventBus;

public class EventBusTest2Activity extends Activity {
    private Button click1;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_event_bus_test2);

        click1 = (Button) findViewById(R.id.click1);
        click1.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                EventBus.getDefault().post(
                        new MyEvent("Message From EventBusTest2"));
            }
        });
    }
}