通过名字获得图片的id

    public static void main() throws SecurityException, NoSuchFieldException,
                IllegalArgumentException, IllegalAccessException,
                ClassNotFoundException
        {
            String resourceName = "R.drawable.icon";
            String packageName = "com.bbcode";
            int resourceId = getResourceId(packageName, resourceName);
            if(R.drawable.icon == resourceId){
                //success
                ;
            }
        }
        public static int getResourceId(String packageName, String resourceName)
                throws SecurityException, NoSuchFieldException,
                IllegalArgumentException, IllegalAccessException,
                ClassNotFoundException
        {
            String[] splitStr = resourceName.split("\\.");
            String classStr = splitStr[0] + "$" + splitStr[1];
            Class c = Class.forName(packageName + "." + classStr);
            Field f = c.getDeclaredField(splitStr[2]);
            return f.getInt(f.getName());
        }