Android开发之bindService()侦听service内部状态

在Android开发之bindService()通信的基础上，实现bindService（）方法侦听service内部状态。

实现侦听service内部状态，使用的是回调机制

1.首先实现一个接口

1     public static  interface CallBack{
2         void onDataChange(String data);
3     }

2.

1     private CallBack callBack=null;
2     public void setCallBack(CallBack callBack) {
3         this.callBack = callBack;
4     }
5     public CallBack getCallBack() {
6         return callBack;
7     }

3.

 1     @Override
 2     public void onCreate() {
 3         // TODO Auto-generated method stub
 4         super.onCreate();
 5         running=true;
 6         new Thread(){
 7             public void run() {
 8                 int i=0;
 9                 while (running) {
10                     i++;
11                     String str=i+":"+data;
12                     Log.d("learnservice", str);
13                     if (callBack!=null) {      
14                         callBack.onDataChange(str);           
15                     }
16                     try {
17                         sleep(1000);
18                     } catch (InterruptedException e) {
19                         // TODO Auto-generated catch block
20                         e.printStackTrace();
21                     }
22                 }
23             };
24         }.start();
25     }

4.MyBinder提供方法返回BindService实例。

1     public class MyBinder extends Binder{
2         public void setData(String data){
3             MyService.this.data=data;
4         }
5         public MyService getService(){
6             return MyService.this;
7         }
8     }

5.

 1         @Override
 2         public void onServiceConnected(ComponentName name, IBinder service) {
 3             // TODO Auto-generated method stub
 4             binder=(MyBinder) service;
 5             binder.getService().setCallBack(new MyService.CallBack() {
 6                 
 7                 @Override
 8                 public void onDataChange(String data) {
 9                     // TODO Auto-generated method stub
10                     Message msg=new Message();
11                     Bundle bundle=new Bundle();
12                     bundle.putString("data", data);
13                     msg.setData(bundle);
14                     handler.sendMessage(msg);
15                 }
16             });
17         }
18     };

6.通过handler，把data放到UI线程，并更新UI线程

1     private Handler handler=new Handler(){
2         public void handleMessage(android.os.Message msg) {
3             tvOut.setText(msg.getData().getString("data"));
4         };
5     };