A fragment defines and manages its own layout, has its own lifecycle, and can handle its own input events. If (home instanceof FragmentDetailedPizza & home. Note: When a new instance of an activity is created, the user can press or gesture Back to return to the previous activity. A Fragment represents a reusable portion of your apps UI. Inside activities on back pressed put this: Fragment home = getSupportFragmentManager().findFragmentByTag("DetailedPizza") On the other hand when you are opening the secondary fragment (fragment in fragment) which is defined as "DetailedPizza" in my code it will return the previous state of primary fragment. The fragment’s view hierarchy becomes part of, or attaches to, the host’s view hierarchy. Fragments cannot live on their own-they must be hosted by an activity or another fragment. ![]() ![]() ![]() This solution works perfectly for bottom bar based fragment navigation when you want to close the app when back pressed in primary fragment. Before embedding a support fragment in an Activity make sure the Activity is changed to extend from FragmentActivity or AppCompatActivity which adds support. A Fragment represents a reusable portion of your apps UI.
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