I have designed the UI for my application with all the elements that needed in this application, include button. But when I want to call the Button class in MainActivity, it can't call the class and import it, Alt Enter & Ctrl Space didn't help. When I press Ctrl Space doesn't show the Button class but shows ButtonBarLayout instead. Any idea where is the error?

CodePudding user response：

Open file select invalid caches and restart...

CodePudding user response：

Thank you all for help. I have already solved the problem. It is the class package of Button that have been excluded from the auto-import. So it doesn't show the auto-import like this Button Class auto-import but shows up only the ButtonBarLayout

I'm sorry for my question that has not been clear enough.