public static void putTheme(int color) {
        SharedPreferences sharedPref = main_act.getPreferences(Context.MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPref.edit();
        editor.putInt("farbe", color);
        editor.commit();
        debug("Save theme: "+color);
    }
    public static int getTheme() {
        SharedPreferences sharedPref = main_act.getPreferences(Context.MODE_PRIVATE);
        int shared_theme = sharedPref.getInt("farbe", 0);
        int theme = 0;

        theme = d_colors[shared_theme];

        return theme;
    }
    public static void loadTheme(Activity act) {

        if (( getTheme() < 0 ) || ( getTheme() > 19)   ) {
            debug("First start!");
            putTheme(5);
            return;
        }
        debug("Theme Number: "+getTheme());
        act.setTheme(getTheme());

    }