Choose another theme (other than Holo
, for example Theme
)
When you create the style incorrectly or from an existing style, this problem usually occurs. So select the “Graphical Layout” select “AppTheme” (The tab with a blue star). And select any of the predefined style. In my case “Light” which should resolve the problem.
Try to ‘Invalidate caches & restart’.
Restart your Android Studio by choosing this option. It may take some time.
Then, if still doesn’t work try to rebuild your project.