UrlDrawable.java

package com.dozuki.ifixit.util;

import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;

public class UrlDrawable extends BitmapDrawable {
   // the drawable that you need to set, you could set the initial drawing
   // with the loading image if you need to
   protected Drawable drawable;

   @Override
   public void draw(Canvas canvas) {
      // override the draw to facilitate refresh function later
      if (drawable != null) {
         drawable.draw(canvas);
      }
   }
}