Codename One-放大或缩小所有样式中所有字体的方法

int fontSize = Display.getInstance().convertToPixels(3);
Font tt  = Font.createTrueTypeFont(s, s).derive(fontSize, Font.STYLE_PLAIN);

有关更多信息,请参阅此链接

https://www.codenameone.com/javadoc/com/codename1/ui/Font.html

谢谢Shai和tizbn,我仔细考虑了你的两个答案。之后,我创建了以下方法来完成我的要求,也许对其他人有用。

/**
 * Increases or reduces of a given percentage all the font sizes of a given
 * theme, overlaying a new theme containing only the new font sizes. The
 * font sizes will be increased when the percentage is positive, they will
 * be reduced when the percentage is negative. Legal percentage values are
 * from -90 to 300.
 *
 * Example of usage: changeFontSizesOfTheme(theme, "Theme", 50);
 *
 * @param theme the given resource file
 * @param themeName the name of given theme
 * @param percentage the given percentage to increase or reduce the font
 * sizes
 */
public static void changeFontSizesOfTheme(Resources theme, String themeName, int percentage) {
    if (theme.isTheme(themeName) && percentage != 0 && percentage >= -90 && percentage <= 300) {
        Hashtable hashtable = theme.getTheme("Theme");
        Hashtable overlay = new Hashtable();
        Set<String> keys = hashtable.keySet();
        Iterator<String> itr = keys.iterator();
        String key;
        Object value;
        int count = 0;
        while (itr.hasNext()) {
            key = itr.next();
            value = hashtable.get(key);
            if (value instanceof Font) {
                Font originalFont = (Font) value;
                float originalFontSize = originalFont.getPixelSize();
                float newFontSize = originalFontSize * (100 + percentage) / 100;
                overlay.put(key, originalFont.derive(newFontSize, originalFont.getStyle()));
                count++;
            }
        }
        UIManager.getInstance().addThemeProps(overlay);
        Log.p(count + " font sizes of the theme \"" + themeName + "\" were overlayed");
    }
}