有時(shí)候因?yàn)槟承┌荒芡ㄟ^ R.java 依賴訪問資源文件
這時(shí)候只能通過反射獲取 資源

/**
     * 反射得到組件的id號(hào)
     * @param packageName 包名
     * @param className  layout,string,drawable,style,id,color,array
     * @param idName    唯一文件名
     * @return  資源id
     */
    public static int getCompentID(String className, String  idName) {
        int id = -1;
        Log.v("testapp", "appname  :"+GameApplication.getContext().getPackageName());
        try {
            Class<?> cls =  Class.forName(GameApplication.getContext().getPackageName()
                       + ".R$" + className);
            Log.v("testapp", "classname :"+cls.getName());
            id = cls.getField(idName).getInt(cls);
        } catch (Exception e) {
            e.printStackTrace();
            Log.v("testapp", "get error");
        }
        return id;
    }