Should I separate launcher activity from my main application

I have an android application which runs on low memory android device (not high RAM android phones). Recently I created a home screen launcher for the same, which does not depend on any of the other app functionalities, its just a plain launcher to display a custom list of installed apps.

I have the following two ways to do this:

1. Keep the launcher activity as part of the main application
2. Create a different app with just the launcher activity

Which of these should I prefer? Will both these methods use the same memory?