Android studio:

A Fragment represents a behavior or a portion of a user interface in an activity. You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities. You can think of a fragment as a modular section of an activity, which has its own lifecycle, receives its own input events, and which you can add or remove while the activity is running (sort of like a "sub activity" that you can reuse in different activities). The main goal of this lab is to learn how to use fragments in Android Applications.

Combine multiple fragments in a single activity. Manage the life cycle of activities and fragments properly. Implement fragment communications. Use bundle objects to save state data to preserve the current UI state

you will develop a Tour guide App. The app introduces the basic information about Canadian cities to the user. The app has one activity and two fragments, as shown in Fig. 1. When a user clicks on a city name in the top list fragment, the description appears in the second fragment. The app uses a bundle object to save state data to preserve the current UI state so that it doesnt change when users rotate the device.