private Boolean isServiceRunning(String serviceName) {
		
		 ActivityManager activityManager = (ActivityManager) getSystemService(ACTIVITY_SERVICE);
		    for (RunningServiceInfo runningServiceInfo : activityManager.getRunningServices(Integer.MAX_VALUE)) {
		        if (serviceName.equals(runningServiceInfo.service.getClassName())) {
		        	return true;
		        }
		    }
		    return false;
	}

This functions checks if a service is running or not.

Android check if service running

service, android

Java