Android開發之bindService()偵聽service內部狀態

標籤：

在Android開發之bindService()通訊的基礎上，實現bindService（）方法偵聽service內部狀態。

實現偵聽service內部狀態，使用的是回調機制

1.首先實現一個介面

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 block20                         e.printStackTrace();21                     }22                 }23             };24         }.start();25     }

4.MyBinder提供方法返回BindService執行個體。

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 stub10                     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.通過handler，把data放到UI線程，並更新UI線程

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

 

Android開發之bindService()偵聽service內部狀態