app/src/main/res/drawable/message_received0.xml
<?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="#54ce08" >
</solid>
<!-- The radius makes the corners rounded -->
<corners android:topLeftRadius="5dp" android:radius="15dp" />
</shape>