5.3.4. Managing Fragments
A parent Activity manages its Fragments with a FragmentManager (package android.app) that’s returned by the Activity’s getFragmentManager method. If the Activity needs to interact with a Fragment that’s declared in the Activity’s layout and has an Id, the Activity can call FragmentManager method findFragmentById to obtain a reference to the specified Fragment. As you’ll see in Chapter 8, a FragmentManager can use FragmentTransactions (package android.app) to dynamically add, remove and transition between Fragments.
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