Identifying RTL language in Android

Question

Is there a way to identify RTL (right-to-left) language, apart from testing language code against all RTL languages?

Since API 17+ allows several resources for RTL a

Answer 1

Thanks to all.

If you look at the code of LayoutUtil.getLayoutDirectionFromLocale() (and, I assume Confuiguration.getLayoutDirection() as well), it ends up with analysing the starting letter of locale display name, using Character.getDirectionality.

Since Character.getDirectionality was around from Android 1, the following code will be compatible with all Android releases (even those, not supporting RTL correctly :)):

public static boolean isRTL() {
    return isRTL(Locale.getDefault());
}

public static boolean isRTL(Locale locale) {
     return
        Character.getDirectionality(locale.getDisplayName().charAt(0)) ==
            Character.DIRECTIONALITY_RIGHT_TO_LEFT; 
}