android 通过资源文件名称获取资源文件id

1.

1. public static Drawable getDrawableByPicName(String picName, Context context) {
   
2.         int id = context.getResources().getIdentifier(
   
3.                 picName == null ? "no_picture" : picName, "drawable",
   
4.                 GlobalConst.PACKAGE_NAME);
   
5.         Drawable image = null;
   
6.         if (id <= 0) {
   
7.             image = context.getResources().getDrawable(R.drawable.no_picture);
   
8.         } else {
   
9.             image = context.getResources().getDrawable(id);
   
10.         }
    
11.         return image;
    
12.     }
13. 2.
14. 可以使用反射，我写了一个小例子。
       

          
          
          
          
    
           
           
           
           
    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());
    
           
           
           
           
        }
           
           
           
           
    3.将图片放到 res/assets 下，不过该方式还没有试过