android 检查某个服务是否正在运行

/**
*
* @param mcontext
* @param serviceName   getPackageName()+".当前包名."+"服务name"
* @return
*/
public static  boolean  serviceIsRun(Context mcontext, String serviceName){
boolean serviceIsRun =false;
ActivityManager activityManager = (ActivityManager) mcontext
.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningServiceInfo> runningServices = activityManager.getRunningServices(100);
for (int i = 0; i < runningServices.size(); i++) {
String s = runningServices.get(i).service.getClassName();

if (s.equals(serviceName)) {
serviceIsRun =true;
}
}
return serviceIsRun;
}