Introducing Fragments
You can get around the letter of the law of Android by moving the app’s UI management from the activity to one or more fragments.
A fragment is a controller object that an activity can deputize to perform tasks. Most commonly, the task is managing a user interface. The user interface can be an entire screen or just one part of the screen.
A fragment managing a user interface is known as a UI fragment. A UI fragment has a view of its own that is inflated from a layout file. The fragment’s view contains the interesting UI elements that the user wants to see and interact with.
The activity’s view contains a spot where the fragment’s view will be inserted. Or it might have several spots for the views of several fragments. ...
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