This is a bit complex, so bear with me. Android doesn’t use launcher images like iOS does. Because people wanted a launcher image, Corona Labs engineers way back in the day added support for reading the iOS Default.png file. In those days we just had a few screen sizes to support. Now today with so many different screen sizes and shapes, its nearly impossible to make a Default.png that works universally.
Also, Apple encourages you to not do splash screens. They think the Default.png should be as close to the first screen the users are going to see when they launch your app and that people should get to the app’s activity as soon as possible. Because of these two ideas, we recommend that you simply provide a Black Default.png and let your app start displaying as soon as it can. If you want a splash screen, implement it in your code and don’t expect the OS or Corona SDK to do it for you.
But to technically answer your question, Corona SDK is going to show your Default.png file, and there are no controls on your side to select anything else.
Rob