Позволяет GSON'у толкать поля с переменные с префикса "m"

GSON_mField.java

    public static class AndroidFieldNamingPolicy implements FieldNamingStrategy {
        private static final String JSON_WORD_DELIMITER = "_";

        @Override
        public String translateName(final Field f) {
            if (f.getName().startsWith("m")) {
                return handleWords(f.getName().substring(1));
            }
            else {
                throw new IllegalArgumentException("Don't know how to handle field not starting with m prefix: " + f.getName());
            }
        }

        private final static Pattern UPPERCASE_PATTERN = Pattern.compile("(?=\\p{Lu})");
        private String handleWords(final String fieldName) {
            String[] words = UPPERCASE_PATTERN.split(fieldName);
            final StringBuffer sb = new StringBuffer();
            for (String word : words) {
                if (sb.length() > 0) {
                    sb.append(JSON_WORD_DELIMITER);
                }
                sb.append(word.toLowerCase());
            }
            return sb.toString();
        }
    }