Since all my tutorials are based on to decompile, change some variables, and recompile to a functional apk file and currently MI2 and all its clones have themes in their apk and thus it becomes somewhat harder to change things, especially because AppToMarket doesn't work properly as it's outdated, but there is still some functionality with some changes to AppToMarket. ( Find out how )
However, I strongly recommend that you learn how to use Apktool Instead, as AppToMarket and all other decompilation software with user friendly interface uses Apktool.
A good tutorial with Apktool can be found here, you may ignore certain things in it.
If you’ve made an app and then realized that you would like a splash screen for your app or that it’s a heavy app and causes black screen during start.
Then this may be the solution for you.