What is retained fragment?
What is retained fragment?
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.
What is the difference between getActivity and Getcontext?
getActivity() is at least a method on Fragment, to get the activity it is attached to. Whenever a context is needed in an instance method of an activity, you can use this . A context is needed whenever contextual info is needed, or when stuff needs to be displayed.
What is fragment explain fragment with suitable example?
A Fragment is a piece of an activity which enable more modular activity design. It will not be wrong if we say, a fragment is a kind of sub-activity. A fragment has its own layout and its own behaviour with its own life cycle callbacks.
Which is useful for retained fragments?
setRetainInstance(true) is especially useful for long running operations inside Fragments which do not care about configuration changes.
What is onAttach in fragment?
The core series of lifecycle methods that are called to bring a fragment up to resumed state (interacting with the user) are: onAttach(Activity) called once the fragment is associated with its activity. onResume() makes the fragment begin interacting with the user (based on its containing activity being resumed).
Does fragment have context?
getApplicationContext() in an instance variable when the fragment is created and then use that context whenever you want inside the fragment class. That context will survive fragment detachments.
How do I get onActivityResult in fragment?
To get the result in your fragment make sure you call startActivityForResult(intent,111); instead of getActivity(). startActivityForResult(intent,111); inside your fragment. @StErMi Make sure you call startActivityForResult() and not getActivity(). startActivityForResult() from your fragment.
How do you use fragments in Kotlin?
xml layout file.
- Open res > layout > activity_main.
- Inside the existing LinearLayout element, add a fragment element.
- Set the fragment’s ID to titleFragment .
- Set the fragment’s name to the full path of the Fragment class, which in this case is com.
- Set the layout width and height to match_parent .
What is setRetainInstance true in fragments?
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.
How do you use fragments?
There are two ways to add a fragment to an activity: dynamically using Java and statically using XML. Before embedding a “support” fragment in an Activity make sure the Activity is changed to extend from FragmentActivity or AppCompatActivity which adds support for the fragment manager to all Android versions.
When to use getcontext() in a fragment?
You may require to make context null again when you leave from fragment This context will be available in onCreateView, so You should use it. Caution: If you need a Context object within your Fragment, you can call getContext (). However, be careful to call getContext () only when the fragment is attached to an activity.
Is there a way to get activity of a fragment?
You can use getActivity(), which returns the activity associated with a fragment. The activity is a context(since Activityextends Context). Share Improve this answer Follow
When should I call getcontext()?
However, be careful to call getContext () only when the fragment is attached to an activity. When the fragment is not yet attached, or was detached during the end of its lifecycle, getContext () will return null.
How do I prevent a fragment from being detached?
A solution for the problem of detached fragments is to store the value of getActivity().getApplicationContext()in an instance variable when the fragment is created and then use that context whenever you want inside the fragment class. That context will survive fragment detachments. – Piovezan Jun 11 ’14 at 15:08 9
