获取某service是否在运行

/**
	 * 判断sevice是否运行着
	 * 
	 * @param serviceName
	 * @return
	 */
	public boolean isServiceRunning(String serviceName) {
		ActivityManager manager = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);
		List<RunningServiceInfo> infos = manager.getRunningServices(30);
		for (RunningServiceInfo info : infos) {
			if (info.service.getClassName().equals(serviceName)) {
				return true;
			}
		}
		return false;
	}