Have you tried adding by creating a new drawable resource file?
<?xml version="1.0" encoding="utf-8"?>
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<!-- view background color -->
<solid
android:color="#a9c5ac" >
</solid>
<!-- view border color and width -->
<stroke
android:width="3dp"
android:color="#1c1b20" >
</stroke>
<!-- If you want to add some padding -->
<padding
android:left="4dp"
android:top="4dp"
android:right="4dp"
android:bottom="4dp" >
</padding>
<!-- Here is the corner radius -->
<corners
android:radius="10dp" >
</corners>
</shape>
Add this in your required layout file