提高服务运行级别（前台服务）

@Override
public void onCreate() {
    //提高服务运行级别
    Notification noti = new Notification();
    noti.icon = R.drawable.ic_launcher;
    Intent intent = new Intent();
    intent.setAction("com.lqr.testactivity");//在清单文件中对testActivity设置了intent-filter的action值
    //点击状态栏的通知后跳转到testActivity界面
    PendingIntent contentIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);
    //把服务变为前台服务，从而提高运行级别，达到杀毒软件杀不死该服务的效果
    noti.setLatestEventInfo(getApplicationContext(), "标题", "内容", contentIntent );
}