![]() ![]() If you want an easier way to create a fragment, you can provide a layout resource to the base constructor instead of inflating a layout in the onCreateView method as seen in the following example: You can create a basic fragment with the following code: Next, you must create a class as a subclass of the Fragment class. So first, add the dependency below to your app-level adle file: In modern Android development, the Jetpack library provides fragment classes and their associated extensions. ![]() Now, let’s learn how to create a fragment. Before detaching it from the activity, you can release or dismiss all remaining resources in this callback.įor more details, check out Fragment lifecycles. OnDestroy(): This callback will be invoked when the fragment is removed, or if the FragmentManager is destroyed. That means the fragment’s view lifecycle moves into the destroyed state and the view is no longer available. OnDestroyView(): This callback will be invoked when the view previously created has been detached from the fragment. OnStop(): This callback will be invoked when the fragment is no longer visible to the user, and is generally tied to the Activity.onStop lifecycle method. This callback is generally tied to the Activity.onPause lifecycle method. OnPause(): This callback will be invoked when the user begins to leave the fragment, and may still be partially visible (for instance, if the user is in multi-window mode). The onResume() callback is generally tied to the Activity.onResume lifecycle method. OnResume(): This callback will be invoked when the fragment is ready to come to the foreground and interact with users. OnStart(): This callback will be invoked when the fragment becomes visible to the user, and is generally tied to the Activity.onStart lifecycle method (it may run more than once if you switch between multiple activities or applications). ![]() You can execute UI-related work in this callback. The onViewCreated() receives an inflated View as a parameter, which means the view hierarchy and view lifecycle has been completely initialized. OnViewCreated(): This callback will be invoked after you return a proper View instance in the onCreateView(). You can also provide an id of a content layout to the fragment constructors that inflates the view at the appropriate time. If you provide a valid View instance on this callback, the fragment’s view lifecycle will be created. OnCreateView(): Most of the view creations of a fragment are handled here. This callback can be invoked while the fragment’s activity is being created, so you must not perform activity-based work here such as calling the getActivity() method. OnCreate(): This callback is invoked after the onAttached() has been called, which means your fragment is created and added to a FragmentManager. In this section, we will discuss the fragment’s lifecycle changes and associated view lifecycle with the nine core callback methods below: You can create your layouts and declare how your fragment behaves with lifecycle callback methods. ![]()
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