Android中具有不同颜色的相同形状

I am having following xml file.I want to make the shape of button circle with some background color.but my each button will contain different background color.For one button i can do it by taking xml in drawable and define shape and color for button.but by this method i need to create separate xml file for each button for shape and color.but i want to do it in only one xml file which contain shape and different color so that i can reduce xml files in drawableI am having following xml file.I want to make t