android Service的用法

Service是后台运行的服务，启动Service可以StartService或者bindservice

 

看看Service的生命周期。

 

当调用StartService时，先走oncreat方法，在走onstart方法。当stopservice时，走ondestory方法。

 

可以绑定一个Service，让它在后台执行，比方说后台播放歌曲等就是这样的。

 

当绑定一个Service时，用bindService方法，这时先走oncreate方法，在走onbind方法。当想停止Service时，用onunbindService方法，这时先走onUnbind方法，在走ondestory方法。

 

上代码：

package com.android.test;



import android.app.Service;

import android.content.Intent;

import android.content.ServiceConnection;

import android.os.IBinder;



public class TestService extends Service {



	@Override

	public IBinder onBind(Intent arg0) {

		// TODO Auto-generated method stub

		System.out.println("onBind");

		return null;

	}



	@Override

	public void onCreate() {

		// TODO Auto-generated method stub

		System.out.println("onCreate");

		super.onCreate();

	}

	

	@Override

	public void onStart(Intent intent, int startId) {

		// TODO Auto-generated method stub

		System.out.println("onStart");

		super.onStart(intent, startId);

	}

	

	@Override

	public void onDestroy() {

		// TODO Auto-generated method stub

		System.out.println("onDestroy");

		super.onDestroy();

	}

	

	@Override

	public boolean onUnbind(Intent intent) {

		// TODO Auto-generated method stub

		System.out.println("onUnbind");

		return super.onUnbind(intent);

	}

	

	@Override

	public void onRebind(Intent intent) {

		// TODO Auto-generated method stub

		System.out.println("onRebind");

		super.onRebind(intent);

	}

}

 

上面这个是Service代码，下面这个是Activity的代码：

代码

   
     

    
      
    
      package
    
       com.android.test;


    
      import
    
       android.app.Activity;

    
      import
    
       android.content.ComponentName;

    
      import
    
       android.content.Intent;

    
      import
    
       android.content.ServiceConnection;

    
      import
    
       android.os.Bundle;

    
      import
    
       android.os.IBinder;

    
      import
    
       android.view.View;

    
      import
    
       android.view.View.OnClickListener;

    
      import
    
       android.widget.Button;


    
      public
    
       
    
      class
    
       TestActivity 
    
      extends
    
       Activity 
    
      implements
    
       OnClickListener {
 
    
      /**
    
       Called when the activity is first created. 
    
      */
    
      
 @Override
 
    
      public
    
       
    
      void
    
       onCreate(Bundle savedInstanceState) {
 
    
      super
    
      .onCreate(savedInstanceState);
 setContentView(R.layout.main);
 Button button1 
    
      =
    
       (Button) findViewById(R.id.button1);
 Button button2 
    
      =
    
       (Button) findViewById(R.id.button2);
 button1.setOnClickListener(
    
      this
    
      );
 button2.setOnClickListener(
    
      this
    
      );
 }

 
    
      public
    
       
    
      void
    
       onClick(View arg0) {
 
    
      //
    
       TODO Auto-generated method stub
    
      

    
       Intent intent 
    
      =
    
       
    
      new
    
       Intent();
 intent.setAction(
    
      "
    
      com.android.testservice
    
      "
    
      );
 
    
      switch
    
      (arg0.getId()) {
 
    
      case
    
       R.id.button1:

    
      //
    
       startService(intent);
    
      

    
       bindService(intent, sc, BIND_AUTO_CREATE);
 
    
      break
    
      ;
 
    
      case
    
       R.id.button2:

    
      //
    
       stopService(intent);
    
      

    
       unbindService(sc);
 
    
      break
    
      ;
 }
 }
 
 ServiceConnection sc 
    
      =
    
       
    
      new
    
       ServiceConnection() {

 
    
      public
    
       
    
      void
    
       onServiceConnected(ComponentName arg0, IBinder arg1) {
 System.out.println(
    
      "
    
      onServiceConnected
    
      "
    
      );
 }

 
    
      public
    
       
    
      void
    
       onServiceDisconnected(ComponentName arg0) {
 System.out.println(
    
      "
    
      onServiceDisconnected
    
      "
    
      );
 }
 
 };
}
   
     

 

哦，对了还要记得在manifest里面注册呢。

 

 

  
    

   
     
   
     
 
   
     <
   
     service 
   
     android:name
   
     =".TestService"
   
     >
   
     
 
   
     <
   
     intent-filter
   
     >
   
     
 
   
     <
   
     action 
   
     android:name
   
     ="com.android.testservice"
   
     />
   
     
 
   
     </
   
     intent-filter
   
     >
   
     
 
   
     </
   
     service
   
     >
  
    

当调用startService方法的时候，打印出来的log是：

　　oncreate

　　onstart

当调用stopService方法的时候，打印出来的log是：

　　ondestory

当调用bindService和unbindServide方法时，打印出来的log是：

 

代码

   
     

    
      
    
      11-25 12:30:47.837: INFO/System.out(335): onCreate
11-25 12:30:47.887: INFO/System.out(335): onBind
11-25 12:30:49.838: INFO/System.out(335): onUnbind
11-25 12:30:49.872: INFO/System.out(335): onDestroy