onViewCreated() : This will be called after onCreateView().We can return null if the fragment does not provide a UI To draw a UI for the fragment, a View component must be returned from this method which is the root of the fragment’s layout.
onCreateView() : The system calls this callback when it’s time for the fragment to draw its UI for the first time.You are passed the Activity that will host your fragment onAttach() :This method will be called first, even before onCreate(), letting us know that your fragment has been attached to an activity.Below are the methods of fragment lifecycle. Fragment LifecycleĪndroid fragment lifecycle is illustrated in below image. The view is then inserted into the ViewGroup parent, and the fragment is alive. The fragment then creates its view and returns it to the activity. Then it gets a reference to the ViewGroup the fragment’s view will be rendered inside.
The following diagram shows depicts what happens when a fragment is added to an activity: First the activity obtains a reference to the fragment. The fragment’s view is displayed inside this ViewGroup. A fragment is added to a ViewGroup inside the activity. Because an android fragment is not a view, adding it to an activity looks somewhat different than adding a view (e.g. It is this view which is eventually displayed inside the activity in which the fragment lives. Instead, a fragment has a view inside it. An Android fragment is not by itself a subclass of View which most other UI components are. A activity can contain any number of fragments. A greatest advantage of fragments is that it simplifies the task of creating UI for multiple screen sizes. Fragment should be used within the Activity.
Android Fragmentįragment class in Android is used to build dynamic User Interfaces. Today we will learn about Android Fragment Lifecycle and implement a single activity class consisting of two fragments in android application.
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