The following static method returns a total number of files in a directory, including files in sub directories:

    /**
     * Counts total number of files in a directory, including sub directories
     * @param dir the directory
     * @return total number of files
     */
    public static int countFilesInDirectory(File dir) {
        int totalFiles = 0;

        File[] listFiles = dir.listFiles();
        if (listFiles != null && listFiles.length > 0) {
            for (File file : listFiles) {
                if (file.isFile()) {
                    totalFiles++;
                } else {
                    totalFiles += countFilesInDirectory(file);
                }
            }
        }

        return totalFiles;
    }

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