What is the difference between onCreate and onCreateView?
What is the difference between onCreate and onCreateView?
onCreate is called on initial creation of the fragment. You do your non graphical initializations here. It finishes even before the layout is inflated and the fragment is visible. onCreateView is called to inflate the layout of the fragment i.e graphical initialization usually takes place here.
What are the differences between onCreate () onCreateView () and onActivityCreated () in fragments and what would they each be used for?
onCreate(Bundle) called to do initial creation of the fragment. onCreateView(LayoutInflater, ViewGroup, Bundle) creates and returns the view hierarchy associated with the fragment. onActivityCreated(Bundle) tells the fragment that its activity has completed its own Activity.
What is first onCreate or onCreateView?
The onCreate() is called first, for doing any non-graphical initialisations. Next, you can assign and declare any View variables you want to use in onCreateView() . Afterwards, use onActivityCreated() to do any final initialisations you want to do once everything has completed.
What is difference between activity and fragment in Android?
Activity is an application component that gives a user interface where the user can interact. The fragment is only part of an activity, it basically contributes its UI to that activity. After using multiple fragments in a single activity, we can create a multi-screen UI.
When should you use a fragment rather than an activity?
4 reasons to use Android Fragments
- Dealing with device form-factor differences. The Activity class is often thought of as the main UI class in Android.
- Passing information between app screens.
- User interface organization.
- Advanced UI metaphors.
What is fragment back stack in Android?
If you add one Fragment into the back stack, when you press the android device back menu, you can find the Fragment that is saved in the back stack popup. Until all the saved Fragments in the back stack popup, then the activity will exit.
What is the difference between an activity and a fragment?
Activity is the part where the user will interacts with your application. Fragment represents a behavior or a portion of user interface in an Activity. You can combine multiple fragments in a single activity to build a multi-pane UI and reuse a fragment in multiple activities.
How do you use LifecycleObserver?
Steps to implement the LifecycleObserever for the Android Application
- Step 1: Create an empty activity project.
- Step 2: Adding the required dependencies.
- Step 3: Working with acitivity_main.xml file.
- Output UI:
- Step 4: Create a class that implements LifecycleObserver.
What is a target fragment?
A fragment is a piece of an application’s user interface or behavior that can be placed in an activity. Interaction with fragments is done through FragmentManager, which can be obtained via Activity.
When is oncreateview() called in Android?
This is because this method can be called when the Activity ‘s onCreate () is not finished, and so trying to access the View hierarchy here may result in a crash. After the onCreate () is called (in the Fragment ), the Fragment ‘s onCreateView () is called.
What is the difference between oncreateview() and onactivitycreated() methods?
onActivityCreated () is deprecated from API Level 28. The onCreate () method in a Fragment is called after the Activity ‘s onAttachFragment () but before that Fragment ‘s onCreateView (). In this method, you can assign variables, get Intent extras, and anything else that doesn’t involve the View hierarchy (i.e. non-graphical initialisations).
What is the use of oncreate method in Android?
The onCreate () method in a Fragment is called after the Activity ‘s onAttachFragment () but before that Fragment ‘s onCreateView (). In this method, you can assign variables, get Intent extras, and anything else that doesn’t involve the View hierarchy (i.e. non-graphical initialisations).
What is the use of onactivitycreated?
onActivityCreated (): As the name states, this is called after the Activity ‘s onCreate () has completed. It is called after onCreateView (), and is mainly used for final initialisations (for example, modifying UI elements). This is deprecated from API level 28.
