public static <T> CharSequence join(final Iterable<T> it, final Func1<T, CharSequence> getter, final CharSequence delim) {
        return join(it.iterator(), getter, delim);
    }
convenience forward to {@link android.text.TextUtils#concat(java.lang.CharSequence...)}
main/src/main/java/cgeo/geocaching/utils/TextUtils.java