如何在不同类的非UI线程中创建对话框？

I'm developing a very simple game in android(that runs in a non-UI thread), I want to make that, when the game is over, it shows a custom dialog box with the score, but the class isn't in the MainActivity class. I can't figure out how to create the dialog in the thread whitout getting any error. I'm developing a very simple game in android(th