How to make custom buttons with different color?

<?xml version="1.0" encoding="UTF-8"?>   
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">   
     <gradient android:startColor="#4CC417" android:endColor="#7C4124" android:angle="270"/>   
    <corners android:bottomRightRadius="7dp" android:bottomLeftRadius="7dp" android:topLeftRadius="7dp" android:topRightRadius="7dp"/>   
 </shape> 

This is my custom button x开发者_StackOverflow社区ml. I want to modify the code to get two or more colors.

A gradient from startColor to endColor already gives 2 colors. A center color can be added by using android:centerColor="#hexcode".