Service的生命周期

Service的生命周期
   Service的生命周期如下
 第一种：Call to startService（）方法->onCreate()->onStartCommand()->service running-

>onDestory->service shut down）


案例：
第一步

在布局文件添加两个按钮

<Button        android:id="@+id/start_service"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="32dp"        android:onClick="dostartService"        android:text="启动simpleService" />    <Button        android:id="@+id/stop_service"        android:layout_width="fill_parent"        android:layout_height="wrap_content"        android:layout_below="@id/start_service"        android:layout_marginTop="51dp"        android:onClick="dostopService"        android:text="停止simpleService" />

第二步创建SimpleService类继承Service

package com.example.simpleservice;import android.app.Service;import android.content.Intent;import android.os.IBinder;import android.util.Log;public class SimpleService extends Service{private  String  tag ="simpleService";@Overridepublic void onCreate() {Log.d(tag, "simpleserviece ->onCreate()");super.onCreate();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Log.d(tag, "simpleserviece ->onStartCommand");return super.onStartCommand(intent, flags, startId);}@Overridepublic void onDestroy() {Log.d(tag, "simpleserviece ->onDestroy()");super.onDestroy();}@Overridepublic IBinder onBind(Intent intent) {return null;}}

第三步配置文件在<application>节点下加入子节点（与activity节点平级）：
<service android:name="com.example.simpleservice.SimpleService" >
        </service>

第四步在MainActivity中加入按钮点击方法：

public class MainActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);}public void dostartService(View v){Intent intent = new Intent(this, SimpleService.class);startService(intent);}public void dostopService(View v){Intent intent = new Intent(this, SimpleService.class);stopService(intent);}}