What is the difference between onCreate and onCreateView?

onCreate() : Initialize essential components and variables of the Fragment in this callback. The system calls this method when the Fragment is created. onCreateView() : Inflate the XML layout for the Fragment in this callback. The system calls this method to draw the Fragment UI for the first time.

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Moreover, what is difference between fragment and activity?

5 Answers. Activity is an application component that gives a user interface where the user can interact. The fragment is a part of an activity, which contributes its own UI to that activity. but using multiple fragments in a single activity we can create multi-pane UI.

Beside above, what is onActivityCreated in Android? 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).

Keeping this in consideration, what is onCreateView in Android?

Android Fragment onCreateView() onCreateView() method gets a LayoutInflater, a ViewGroup and a Bundle as parameters. When you pass false as last parameter to inflate(), the parent ViewGroup is still used for layout calculations of the inflated View, so you cannot pass null as parent ViewGroup .

Which method is called before the onCreateView method in fragment's lifecycle?

The fragment callback methods are : onAttach() is called when a fragment is connected to an activity. onCreate() is called to do initial creation of the fragment. onCreateView() is called by Android once the Fragment should inflate a view.

Related Question Answers

What is the example of fragment?

Definition of a Sentence Fragment For example, 'I like cheeseburgers' is an independent clause. Sentence fragments never have independent clauses, but instead are dependent clauses or phrases. Fragments can masquerade as real sentences because they begin with a capital letter and end with a period.

Should I use fragments or activities?

To put it simply : Use fragment when you have to change the UI components of application to significantly improve app response time. Use activity to launch existing Android resources like video player, browser etc.

What is the purpose of the fragments?

A fragment is an independent Android component which can be used by an activity. A fragment encapsulates functionality so that it is easier to reuse within activities and layouts. A fragment runs in the context of an activity, but has its own life cycle and typically its own user interface.

Why are fragments used?

A fragment is usually used as part of an activity's user interface and contributes its own layout to the activity. To provide a layout for a fragment, you must implement the onCreateView() callback method, which the Android system calls when it's time for the fragment to draw its layout.

What is a fragment activity?

Fragment is a part of an activity, which contributes its own UI to that activity. Fragment can be thought like a sub activity, whereas the complete screen with which user interacts is called as activity. An activity can contain multiple fragments.

What is an activity in Android?

An Android activity is one screen of the Android app's user interface. In that way an Android activity is very similar to windows in a desktop application. An Android app may contain one or more activities, meaning one or more screens.

Why do we use fragments?

Fragments always exist within the context of a given Activity and can always access that Activity. By storing the information of interest within the Activity, the Fragment for each screen can simply access the object reference through the Activity.

What is a fragment why are they useful?

Fragments allow such designs without the need for you to manage complex changes to the view hierarchy. By dividing the layout of an activity into fragments, you become able to modify the activity's appearance at runtime and preserve those changes in a back stack that's managed by the activity. Here you can read more.

What is context android?

A Context is a handle to the system; it provides services like resolving resources, obtaining access to databases and preferences, and so on. An Android app has activities. Context is like a handle to the environment your application is currently running in. The activity object inherits the Context object.

What is setRetainInstance true?

setRetainInstance() method control whether a fragment instance is retained across Activity re-creation (such as from a configuration change). This can only be used with fragments not in the back stack.

What is a bundle in Android?

Android Bundle. Android Bundle is used to pass data between activities. The values that are to be passed are mapped to String keys which are later used in the next activity to retrieve the values.

What is the use of intent in android?

An intent is to perform an action on the screen. It is mostly used to start activity, send broadcast receiver,start services and send message between two activities. There are two intents available in android as Implicit Intents and Explicit Intents. Here is a sample example to start new activity with old activity.

How do you get the context of a fragment?

For this, first check with the isAdded() method which will determine whether it's added or not, and then we can use the getActivity() to get the context of Activity. You can use getActivity() method to get context or You can use getContext() method . View root = inflater. inflate(R.

What is onAttach in fragment?

onAttach() — This method called first, To know that our fragment has been attached to an activity. We are passing the Activity that will host our fragment. onCreate() — This method called when a fragment instance initializes, just after the onAttach where fragment attaches to the host activity.

What is retained fragment Android?

Specifically, "retained" means that the fragment will not be destroyed on configuration changes. That is, the Fragment will be retained even if the configuration change causes the underlying Activity to be destroyed.

Why is it recommended to use only the default constructor to create a fragment?

Otherwise, the default constructor simply invokes the superclass constructor with no arguments. It is used in the case when device has to restore the state of a fragment. No data will be passed and a default fragment will be created and then the state will be restored.

How do I get bundles in fragment?

Therefore, in order to pass your data to the Fragment being created, you should use the setArguments() method. This methods gets a bundle, which you store your data in, and stores the Bundle in the arguments. Subsequently, this Bundle can then be retrieved in onCreate() and onCreateView() call backs of the Fragment.

What is activity life cycle?

Android Activity Lifecycle is controlled by 7 methods of android. The android Activity is the subclass of ContextThemeWrapper class. An activity is the single screen in android. It is like window or frame of Java. By the help of activity, you can place all your UI components or widgets in a single screen.