Service的生命周期

Service的生命周期

Service的生命周期例如以下

第一种：Call to startService（）方法->onCreate()->onStartCommand()->service running-

>onDestory->service shut down）

案例：

第一步

在布局文件加入两个button

<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";
@Override
public void onCreate() {

Log.d(tag, "simpleserviece ->onCreate()");
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {

Log.d(tag, "simpleserviece ->onStartCommand");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
Log.d(tag, "simpleserviece ->onDestroy()");

super.onDestroy();
}

@Override
public IBinder onBind(Intent intent) {

return null;
}

}

第三步配置文件在<application>节点下增加子节点（与activity节点平级）：

<service android:name="com.example.simpleservice.SimpleService" >

</service>

第四步在MainActivity中增加button点击方法：

public class MainActivity extends Activity {

@Override
protected 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);
}
}