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[操作系统]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:

1 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

 1 package com.item.jiejie.event; 2  3 import de.greenrobot.event.EventBus; 4 import de.greenrobot.event.Subscribe; 5 import android.os.Bundle; 6 import android.app.Activity; 7 import android.app.AlertDialog; 8 import android.content.Context; 9 import android.content.DialogInterface;10 import android.content.Intent;11 import android.view.View;12 import android.widget.Button;13 import android.widget.TextView;14 15 public class MainActivity extends Activity {16 17   private TextView tv_View;18   private Button btn_to_finish;19 20   @Override21   protected void onCreate(Bundle savedInstanceState) {22     super.onCreate(savedInstanceState);23     setContentView(R.layout.activity_main);24     setView();25     EventBus.getDefault().register(this);26   }27   28   @Override29   protected void onDestroy() {30     // TODO Auto-generated method stub31     super.onDestroy();32     EventBus.getDefault().unregister(this);33   }34   private void setView() {35     // TODO Auto-generated method stub36     tv_View = (TextView) findViewById(R.id.tv_text);37     btn_to_finish = (Button) findViewById(R.id.btn_to_one);38     btn_to_finish.setOnClickListener(new View.OnClickListener() {39 40       @Override41       public void onClick(View arg0) {42         // TODO Auto-generated method stub43         startActivity(new Intent(MainActivity.this, OneActivity.class));44       }45     });46   }47   private boolean isShow = false;48   @Override49   protected void onStart() {50     // TODO Auto-generated method stub51     super.onStart();52     isShow = true;53   }54   @Override55   protected void onStop() {56     // TODO Auto-generated method stub57     super.onStop();58     isShow =false;59   }60   @Subscribe61   public void onMessageReviced(final String Message) {62     tv_View.setText(Message);63     System.out.println("收到消息ddd :" + Message);64   }65 66   @Subscribe67   public void onMessageReviced(final Student Message) {68     //显示一个弹窗69     System.out.println("收到消息dddx :" + Message);70     if(Message != null){71       showAlertDialog(this, "姓名:" + Message.getName() + "\\年龄:" + Message.getAge() + "\\性别:" +Message72           .getSex());73     }74   }75   private void showAlertDialog(final Context context,String string){76     AlertDialog.Builder dialog = new AlertDialog.Builder(context);77     dialog.setTitle("我是标题");78     dialog.setMessage(string);79     dialog.setPositiveButton("确定", new DialogInterface.OnClickListener() {80       81       @Override82       public void onClick(DialogInterface arg0, int arg1) {83         // TODO Auto-generated method stub84         85       }86     });87     AlertDialog mDialog = dialog.create();88     mDialog.show();89   }90 }