app/src/main/res/drawable/background_received_picture.xml
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="?attr/colorControlHighlight" />
<padding
android:left="13dp"
android:right="13dp"
android:bottom="7dp"
android:top="7dp" />
<corners
android:topLeftRadius="20dp"
android:topRightRadius="20dp"
android:bottomLeftRadius="0dp"
android:bottomRightRadius="0dp"/>
</shape>