ImageButton Border Transparency – How do I remove the square border around round image?

Set this attribute in your ImageButton XML android:background="@null"

<ImageButton android:src="https://stackoverflow.com/questions/5374066/@drawable/yourimagename"
     android:id="@+id/thebuttonid"
     android:layout_width = "wrap_content"
     android:layout_height = "wrap_content"
     android:background="@null"
     />