public static int adjustFontSize(int screenWidth, int screenHeight){
     
    if (screenWidth <= 240) {        // 240X320 螢幕
         
        return 10;
 
    }else if (screenWidth <= 320){   // 320X480 螢幕
 
        return 14;
 
    }else if (screenWidth <= 480){   // 480X800 或 480X854 螢幕
 
        return 24;
 
    }else if (screenWidth <= 540){   // 540X960 螢幕 
 
        return 26;
         
    }else if(screenWidth <= 800){    // 800X1280 螢幕 
 
        return 30;
         
    }else{                          // 大於 800X1280
 
        return 30;
         
    }
}