A fragment can be used in multiple activities. Fragment life cycle is closely related to the life cycle of its host activity which means when the activity is paused, all the fragments available in the activity will also be stopped. A fragment can implement a behaviour that has no user interface component.
What is the fragment in Android?
According to the Android documentation, a fragment is a part of applications user interface that is bound to an activity. Fragments have their lifecycle and layouts or UI components. Fragments help enrich your UI design, pass data between different screens, and adapt to different device configurations.
What is the difference between activity and fragment lifecycle in Android?
It has its own layout and its own behavior with its own life cycle callbacks. We can add or remove fragments in an activity while the activity is running.
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Difference Table.
| Activity | Fragment |
|---|---|
| we need to mention all activity it in the manifest.xml file | Fragment is not required to mention in the manifest file |
What is difference between fragment and activity?
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.
What is the use of fragments in Android applications?
A Fragment is a combination of an XML layout file and a java class much like an Activity . Using the support library, fragments are supported back to all relevant Android versions. Fragments encapsulate views and logic so that it is easier to reuse within activities.
Is a fragment sentence?
Fragments are incomplete sentences. Usually, fragments are pieces of sentences that have become disconnected from the main clause. One of the easiest ways to correct them is to remove the period between the fragment and the main clause.
Which method fragment becomes active?
To draw a UI for your fragment, you must return a View component from this method that is the root of your fragment’s layout. You can return null if the fragment does not provide a UI. onStart()The onStart() method is called once the fragment gets visible. onResume()Fragment becomes active.
Is it possible activity without UI in Android?
The answer is yes it’s possible. Activities don’t have to have a UI. It’s mentioned in the documentation, e.g.: An activity is a single, focused thing that the user can do.
Which is better fragment or activity?
Activities are an ideal place to put global elements around your app’s user interface, such as a navigation drawer. Conversely, fragments are better suited to define and manage the UI of a single screen or portion of a screen. Consider an app that responds to various screen sizes.
What is onActivityCreated in Android?
onActivityCreated(Bundle) tells the fragment that its activity has completed its own Activity. onCreate() . onViewStateRestored(Bundle) tells the fragment that all of the saved state of its view hierarchy has been restored.
What is the difference between fragment and view?
Custom Views have the advantage of simplicity and their primary purpose is to display a piece of data on the screen. They must rely on other components in order to do more. Think of Fragments as a functional unit, a way to display a portion of UI that has a specific purpose, using one or more Views.
Which method is called fragment going to be stopped?
onStop() is normally called when fragment becomes invisible, but it can also be called later in time. Depending on your layout Android can call onStart() even, when your Fragment is not yet visible, but it belongs to a visible parent container. For instance, this is valid for android.