Gradient Button
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:color="@color/black"
android:width="5dp"/>
<solid
android:color="@color/purple_500"/>
<corners
android:radius="10dp"/>
<gradient
android:startColor="@color/black"
android:centerColor="@color/purple_500"
android:endColor="@color/white"
android:angle="125"/>
</shape>