Android getting resource ID by name

Sometimes, it becomes necessary to have resource ID by name of the image. Below code works great for doing this

try {

        Class res = R.drawable.class;

        Field field = res.getField("drawableName");

        int drawableId = field.getInt(null);

    }

    catch (Exception e) {

        Log.e("MyTag", "Failure to get drawable id.", e);

    }

references:
http://stackoverflow.com/questions/3042961/how-do-i-get-the-resource-id-of-an-image-if-i-know-its-name