can we make multi color gradient in xml for android background?

According to developers.android
you can… and this is the code they used

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >

<gradient
    android:angle="45"
    android:endColor="#87CEEB"
    android:centerColor="#768087"
    android:startColor="#000"
    android:type="linear" />

</shape>

also here’s a tutorial

hope this helps