<?xml version="1.0" encoding="utf-8"?>

 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

     android:orientation="vertical"

     android:layout_width="fill_parent"

     android:layout_height="fill_parent"

     >

 <Button

     android:id="@+id/startService"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"

     android:text="StartService"

     />

 <Button

     android:id="@+id/stopService"

     android:layout_width="fill_parent"

     android:layout_height="wrap_content"

     android:text="StopService"

     />

 </LinearLayout>

 <?xml version="1.0" encoding="utf-8"?>

 <manifest xmlns:android="http://schemas.android.com/apk/res/android"

     package="com.service"

     android:versionCode="1"

     android:versionName="1.0" >

     <uses-sdk

         android:minSdkVersion="8"

         android:targetSdkVersion="21" />

     <application

         android:allowBackup="true"

         android:icon="@drawable/ic_launcher"

         android:label="@string/app_name"

         android:theme="@style/AppTheme" >

         <activity

             android:name=".TestActivity"

             android:label="@string/app_name" >

             <intent-filter>

                 <action android:name="android.intent.action.MAIN" />

                 <category android:name="android.intent.category.LAUNCHER" />

             </intent-filter>

         </activity>

         <service android:name=".FirstService"/>

     </application>

 </manifest>

 package com.service;

 import android.app.Activity;

 import android.content.Intent;

 import android.os.Bundle;

 import android.view.View;

 import android.view.View.OnClickListener;

 import android.widget.Button;

 public class TestActivity extends Activity {

     /** Called when the activity is first created. */

     private Button startServiceButton = null;

     private Button stopServiceButton = null;

     @Override

     public void onCreate(Bundle savedInstanceState) {

         super.onCreate(savedInstanceState);

         setContentView(R.layout.main);

         startServiceButton = (Button) findViewById(R.id.startService);

         startServiceButton.setOnClickListener(new StartServiceListener());

         stopServiceButton = (Button) findViewById(R.id.stopService);

         stopServiceButton.setOnClickListener(new StopServiceListener());

         System.out.println("Activity onCreate");

     }

     class StartServiceListener implements OnClickListener {

         @Override

         public void onClick(View v) {

             Intent intent = new Intent();

             intent.setClass(TestActivity.this, FirstService.class);

             startService(intent);

         }

     }

     class StopServiceListener implements OnClickListener {

         @Override

         public void onClick(View v) {

             Intent intent = new Intent();

             intent.setClass(TestActivity.this, FirstService.class);

             stopService(intent);

         }

     }

 }

 package com.service;

 import android.app.Service;

 import android.content.Intent;

 import android.os.Binder;

 import android.os.IBinder;

 public class FirstService extends Service {

     @Override

     public IBinder onBind(Intent intent) {

         // TODO Auto-generated method stub

         System.out.println("Service onBind");

         return null;

     }

     //当创建一个Servcie对象之后，会首先调用这个函数

     @Override

     public void onCreate() {

         // TODO Auto-generated method stub

         super.onCreate();

         System.out.println("Service onCreate");

     }

     @Override

     public int onStartCommand(Intent intent, int flags, int startId) {

         // TODO Auto-generated method stub

         System.out.println("flags--->" + flags);

         System.out.println("startId--->" + startId);

         System.out.println("Service onStartCommand");

         return START_NOT_STICKY;

     }

     @Override

     public void onDestroy() {

         // TODO Auto-generated method stubo

         System.out.println("Service onDestory");

         super.onDestroy();

     }

 }