I will create android splash screen, banner, and icon design

First you need a splash screen image. Because Android devices come in various resolutions, you may want to ship several splash screens as described in Google's Best Practices for Supporting Multiple Screens. For simplicity, we'll just ship one here that is 480x800. It should support most phone sizes pretty well, and Android will scale it as best it can. I can able to do as per your needs on designs for android