Since android update the standard MainActivity app inicializations, it's being a mess to clean a project when you want to start it with only one activity.
This project is a template to start your project with one simple and clean activity
First off all, remember to update this READ.me file, to match info of your project
Right click on main package name com.example.base_app -> refactor -> rename and change the package name for whatever you want
On your AndroidManifest.xml under manifest tag, change attribute package to your new package name
On res -> values -> strings.xml update your app_name string
on Settings.gradle (Project Settings) change rootProject.name
On build.gradle(:app) folow the json keys android > defaultConfig > applicationId and change it to your new package name