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

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

2.

     private CallBack callBack=null;
     public void setCallBack(CallBack callBack) {
         this.callBack = callBack;
     }
     public CallBack getCallBack() {
         return callBack;
     }

3.

     @Override
     public void onCreate() {
         // TODO Auto-generated method stub
         super.onCreate();
         running=true;
         new Thread(){
             public void run() {
                 int i=0;
                 while (running) {
                     i++;
                     String str=i+":"+data;
                     Log.d("learnservice", str);
                     if (callBack!=null) {
                         callBack.onDataChange(str);
                     }
                     try {
                         sleep(1000);
                     } catch (InterruptedException e) {
                         // TODO Auto-generated catch block
                         e.printStackTrace();
                     }
                 }
             };
         }.start();
     }

4.MyBinder提供方法返回BindService实例。

     public class MyBinder extends Binder{
         public void setData(String data){
             MyService.this.data=data;
         }
         public MyService getService(){
             return MyService.this;
         }
     }

5.

         @Override
         public void onServiceConnected(ComponentName name, IBinder service) {
             // TODO Auto-generated method stub
             binder=(MyBinder) service;
             binder.getService().setCallBack(new MyService.CallBack() {

                 @Override
                 public void onDataChange(String data) {
                     // TODO Auto-generated method stub
                     Message msg=new Message();
                     Bundle bundle=new Bundle();
                     bundle.putString("data", data);
                     msg.setData(bundle);
                     handler.sendMessage(msg);
                 }
             });
         }
     };

6.通过handler，把data放到UI线程，并更新UI线程

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