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GeoFire is an open-source library for Android/Java that allows you to store and query a set of keys based on their geographic location.

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package com.firebase.geofire.util;

public class Base32Utils {

    /* number of bits per base 32 character */
    public static final int BITS_PER_BASE32_CHAR = 5;

    private static final String BASE32_CHARS = "0123456789bcdefghjkmnpqrstuvwxyz";

    private Base32Utils() {}

    public static char valueToBase32Char(int value) {
        if (value < 0 || value >= BASE32_CHARS.length()) {
            throw new IllegalArgumentException("Not a valid base32 value: " + value);
        }
        return BASE32_CHARS.charAt(value);
    }

    public static int base32CharToValue(char base32Char) {
        int value = BASE32_CHARS.indexOf(base32Char);
        if (value == -1) {
            throw new IllegalArgumentException("Not a valid base32 char: " + base32Char);
        } else {
            return value;
        }
    }

    public static boolean isValidBase32String(String string) {
        return string.matches("^[" + BASE32_CHARS + "]*$");
    }
}