Android  Service类与生命周期详细介绍

public class MyService extends Service {  // 必须实现，绑定该Service时被回调  @Override  public IBinder onBind(Intent intent) {    return null;  }  // Service被创建时回调  @Override  public void onCreate() {    super.onCreate();    // 定义相关业务逻辑    System.out.println("Service is Created");  }  // Service被启动时回调  @Override  public int onStartCommand(Intent intent, int flags, int startId) {    // 定义相关业务逻辑    System.out.println("Service is Started");    return START_STICKY;  }  // Service被关闭之前回调  @Override  public void onDestroy() {    super.onDestroy();    System.out.println("Service is Destroyed");  }}