gradient.xml

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:tools="http://schemas.android.com/tools" xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <shape tools:ignore="ExtraText">
            <gradient
                android:angle="90"
                android:endColor="#1FA2FF"
                android:centerColor="#12D8FA"
                android:startColor="#A6FFCB"
                android:type="linear"/>
        </shape>
    </item>
</selector>