Android circle background becomes oval

• Change your textView‘s layout_height and layout_width to wrap_content
• Add size tag inside shape tag as follows

<shape 
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">> 
<solid android:color="#79bfea" />
<size android:height="25dp"
   android:width="25dp"/>
</shape>

If it is still oval, try increasing the width and height in size tag. It worked for me!