Android - Basic UI for game app

I'm new to Android and don't know much about UI.

I am trying to create a simple game, and I want to add a possibility for each team playing to enter the team name followed by the team members name. For now, I am good with managing all teams on one device (no multiplayer needed).

What is the best way to do such thing? I thought to make it using alert dialog boxes, but I'm not sure this is the proper way, as they are not synced.

Any help will be appreciated. Thank you