How to open a text box in android studio?

Question

Essentially, I want to open an input text box when the app is first opened that prompts the user to input their userid. I don't need to verify the id, I simply need to store it as a string for a later task. How do I make a pop up window that disappears once the user has entered their id?

Answer 1

These were helpful in learning how to make a popup window:

1. PopupWindow documentation
2. How To Create Pop Up Window In Android (YouTube video)
3. Android Popup Window Example