EventBus 3.0使用

在没用eventBus之前一直用Android广播方式通知消息更新UI

广播写法

首先发送广播通知

Intent intent = new Intent();
intent.setAction("action.refreshFriend"); //名称自定义标识是哪个通知消息
sendBroadcast(intent);

接收广播通知

首先注册广播

IntentFilter intentFilter = new IntentFilter();
intentFilter.addAction("action.refreshFriend");
registerReceiver(mRefreshBroadcastReceiver, intentFilter);

private BroadcastReceiver mRefreshBroadcastReceiver = new BroadcastReceiver() { 

@Override 
public void onReceive(Context context, Intent intent) { 
String action = intent.getAction(); 
if (action.equals("action.refreshFriend")) 
{ 
　　//更新UI
} 
} 
};

protected void onDestroy() {
super.onDestroy();
unregisterReceiver(mRefreshBroadcastReceiver); //销毁广播
}

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https://github.com/greenrobot/EventBus

EventBus是Android的发布/订阅事件总线优化。

首先添加引用 

 compile 'org.greenrobot:eventbus:3.0.0'

MainActivity代码

package com.freexiaoyu.enevtbus;

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

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

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class MainActivity extends AppCompatActivity {
    @BindView(R.id.tv_test)
    TextView tv_text;
    @BindView(R.id.btn_post)
    Button btn_post;
    @BindView(R.id.btn_post2)
    Button btn_post2;
    @BindView(R.id.btn_post3)
    Button btn_post3;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ButterKnife.bind(this);
        EventBus.getDefault().register(this);
    }

    @Subscribe(threadMode = ThreadMode.MAIN)
    public void helloEventBus(Event event) {
        switch (event.getType()){
            case 1:
                tv_text.setText(event.getMessage().toString());
                break;
            case 2:
                tv_text.setText(event.getMessage().toString());
                break;
            case 3:
                tv_text.setText(event.getMessage().toString());
                break;
        }

    }

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

    @OnClick({R.id.btn_post,R.id.btn_post2,R.id.btn_post3})
    public void submit(View view) {
        switch (view.getId()){
            case R.id.btn_post:
                EventBus.getDefault().post(new Event(1,"我是老大"));
                break;
            case R.id.btn_post2:
                EventBus.getDefault().post(new Event(2,"我是老二"));
                break;
            case R.id.btn_post3:
                Intent intent=new Intent(MainActivity.this,TestActivity.class);
                startActivity(intent);
                break;
        }
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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" android:orientation="vertical">

    <TextView
        android:id="@id/tv_test"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />

    <Button
        android:id="@id/btn_post"
        android:layout_width="match_parent"
        android:layout_height="52.0dp"
        android:text="EventBus" />
    <Button

        android:id="@id/btn_post2"
        android:layout_width="match_parent"
        android:layout_height="52.0dp"
        android:text="EventBus" />
    <Button

        android:id="@id/btn_post3"
        android:layout_width="match_parent"
        android:layout_height="52.0dp"
        android:text="跳转界面" />
</LinearLayout>

TestActivity代码

package com.freexiaoyu.enevtbus;

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

import org.greenrobot.eventbus.EventBus;

import butterknife.BindView;
import butterknife.ButterKnife;
import butterknife.OnClick;

public class TestActivity extends AppCompatActivity {
    @BindView(R.id.btn_post)
    Button btn_post;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_test);
        ButterKnife.bind(this);
    }

    @OnClick({R.id.btn_post})
    public void submit(View view) {
        switch (view.getId()){
            case R.id.btn_post:
                EventBus.getDefault().post(new Event(3,"我是小三哈哈!"));
                break;
        }
    }


    @Override
    protected void onDestroy() {
        super.onDestroy();
    }
}

<?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">

    <Button
        android:id="@id/btn_post"
        android:layout_width="match_parent"
        android:layout_height="52.0dp"
        android:text="我要更新上一页内容" />
</RelativeLayout>

Event代码

public class Event {
    private int type;
    private Object message;

    public Event(int type, Object message){
        this.type=type;
        this.message=message;
    }

    public int getType() {
        return type;
    }

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

    public Object getMessage() {
        return message;
    }
    public void setMessage(Object message) {
        this.message = message;
    }
}

　　

 DEMO地址 https://yunpan.cn/cB3SH2Ig7dAZU  访问密码 aad8