Why button gets bigger when the background is set in android

Question

I encountered a problem with the Button view when I set a background to it using the android:background attribute in xml. Before I set the background,

Answer 1

Another option if you want to support anything below API Level 21 is to create a custom drawable with a transparent stroke around a colored shape. This gives you the flexibility of also adding block colors and gradients.

Note the stroke with and transparency which shrinks the button size

button_background.xml

Button