Android Background Drawable Not Working in Button Since Android Studio 4.1

Question

I find out that since Android Studio 4.1 I cannot change the background color of a Button by setting color on its android:background, just no effec

Answer 1

The Android Studio 4.1 new-project wizard, for many of its templates, has the project use the Material Components for Android library. And, it sets up the default theme to be based on Theme.MaterialComponents.DayNight.DarkActionBar.

A side effect of this is that any elements in a layout get turned into MaterialButton widgets, not regular Button widgets. MaterialButton ignores android:background.

If all you want to do is to change the color, use android:backgroundTint or change the colorPrimary attribute in the theme.

If you want a button that has a custom background, and your theme is set up to use Theme.MaterialComponents, you could switch the XML element in the layout to be instead of

. This should cause the Material Components for Android to ignore that element, and you can manipulate this button normally with respect to XML attributes.