app/src/main/res/drawable/post_button.xml
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<gradient
android:centerX="0%"
android:centerY="-50%"
android:startColor="#F2B872"
android:endColor="#0780B6"
android:gradientRadius="300"
android:type="radial"/>
<corners
android:topLeftRadius="20dp"
android:topRightRadius="20dp"
android:bottomLeftRadius="20dp"
android:bottomRightRadius="20dp"/>
</shape>