Android 判断一个Service是否已经运行

public boolean isServiceWork(Context mContext, String serviceName) { boolean isWork = false; ActivityManager myAM = (ActivityManager)mContext.getSystemService(Context.ACTIVITY_SERVICE); List<RunningServiceInfo> myList = (List<RunningServiceInfo>)myAM.getRunningServices(40); if (myList.size() <= 0) { return false; } for(int i = 0; i < myList.size(); i++) { String mName = myList.get(i).service.getClassName().toString(); if (mName.equals(serviceName)) { isWork = true; break; } } return isWork; }