EventBus简单的实现

EventBus是最近项目用到的，也只是会些简单的功能，不过感觉功能蛮强大的。代码链接：http://download.csdn.net/detail/qq_29774291/9629346

EventBus是Guava的事件处理机制，是设计模式中的观察者模式（生产/消费者编程模型）的优雅实现。主要功能是替代Intent,Handler,BroadCast在Fragment，Activity，Service，线程之间传递消息.优点是开销小，代码更优雅。以及将发送者和接收者解耦。

一.下载的类库：https://github.com/greenrobot/EventBus

二.基本的使用：

　　1.在要接收消息的页面注册：

 EventBus.getDefault().register(this);

　　2.在发送界面发送消息：

Student student = new Student(20, "张三", "男");
EventBus.getDefault().post(student);

　　3.在接受界面接受信息：

@Subscribe
    public void onMessageReviced(final Student Message) {
        //显示一个弹窗
        System.out.println("收到消息dddx ：" + Message);
        if(Message != null){
            showAlertDialog(this, "姓名：" + Message.getName() + "\\年龄：" + Message.getAge() + "\\性别：" +Message
                    .getSex());
        }
    }

　　4.解除注册：

        @Override
    protected void onDestroy() {
        // TODO Auto-generated method stub
        super.onDestroy();
        EventBus.getDefault().unregister(this);
    }    

主程序代码

 package com.item.jiejie.event;

 import de.greenrobot.event.EventBus;
 import de.greenrobot.event.Subscribe;
 import android.os.Bundle;
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.content.Context;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.view.View;
 import android.widget.Button;
 import android.widget.TextView;

 public class MainActivity extends Activity {

     private TextView tv_View;
     private Button btn_to_finish;

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

     @Override
     protected void onDestroy() {
         // TODO Auto-generated method stub
         super.onDestroy();
         EventBus.getDefault().unregister(this);
     }
     private void setView() {
         // TODO Auto-generated method stub
         tv_View = (TextView) findViewById(R.id.tv_text);
         btn_to_finish = (Button) findViewById(R.id.btn_to_one);
         btn_to_finish.setOnClickListener(new View.OnClickListener() {

             @Override
             public void onClick(View arg0) {
                 // TODO Auto-generated method stub
                 startActivity(new Intent(MainActivity.this, OneActivity.class));
             }
         });
     }
     private boolean isShow = false;
     @Override
     protected void onStart() {
         // TODO Auto-generated method stub
         super.onStart();
         isShow = true;
     }
     @Override
     protected void onStop() {
         // TODO Auto-generated method stub
         super.onStop();
         isShow =false;
     }
     @Subscribe
     public void onMessageReviced(final String Message) {
         tv_View.setText(Message);
         System.out.println("收到消息ddd ：" + Message);
     }

     @Subscribe
     public void onMessageReviced(final Student Message) {
         //显示一个弹窗
         System.out.println("收到消息dddx ：" + Message);
         if(Message != null){
             showAlertDialog(this, "姓名：" + Message.getName() + "\\年龄：" + Message.getAge() + "\\性别：" +Message
                     .getSex());
         }
     }
     private void showAlertDialog(final Context context,String string){
         AlertDialog.Builder dialog = new AlertDialog.Builder(context);
         dialog.setTitle("我是标题");
         dialog.setMessage(string);
         dialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {

             @Override
             public void onClick(DialogInterface arg0, int arg1) {
                 // TODO Auto-generated method stub

             }
         });
         AlertDialog mDialog = dialog.create();
         mDialog.show();
     }
 }