Android开发：判断Service是否运行？

这个方法我正在使用呢，而且在ANdroid4.2以上使用是好使的
public static boolean isServiceRunning(Context mContext,String className) {

boolean isRunning = false;
ActivityManager activityManager = (ActivityManager)
mContext.getSystemService(Context.ACTIVITY_SERVICE);
List serviceList
= activityManager.getRunningServices(30);

if (!(serviceList.size()>0)) {
return false;
}

for (int i=0; i if (serviceList.get(i).service.getClassName().equals(className) == true) {
isRunning = true;
break;
}
}
return isRunning;
}