Utilities.java

    /**
     * Is the Android service running?
     * @param context The current context.
     * @param serviceClass The service to get running state.
     * @return true: if service is running.
     */
    static boolean isServiceRunning(Context context, Class<?> serviceClass) {
        ActivityManager manager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
        if (manager == null) return false;
        for (ActivityManager.RunningServiceInfo serviceInfo : manager.getRunningServices(Integer.MAX_VALUE)) {
            if (serviceInfo.service.getClassName().equals(serviceClass.getName())) {
                return true;
            }
        }
        return false;
    }

    /**
     * Find integer string from a string.
     * @param str The string to get integer string.
     * @return The resulting integer string.
     */
    static List<String> findIntegerString(String str) {
        List<String> result = new ArrayList<>();
        Pattern pattern = Pattern.compile("\\d+");
        Matcher matcher = pattern.matcher(str);
        while (matcher.find()) {
            result.add(str.substring(matcher.start(),matcher.end()));
        }
        return result;
    }