This combo pack will save you some money if you purchase it here rather than purchasing them individually, Both these apps are not related to one another you can import them individually in android studio. You can gain a lot of knowledge in firebase through this ecommerce app and reuse this template with your own ideas with firebase as your backend. The spying app will let you get the mobile number of the person you want to spy on.
3 Main features
1. Complete knowledge of Firebase database and Storage
2. Reusable ecommerce template with your own ideas
3. Spy app with broadcast receivers