What is the use of getActivity in Android?

The getActivity() method gives the context of the Activity. You can use YourActivityName. this instead of it. The method getActivity() is normally used in fragments to get the context of the activity in which they are inserted or inflated.

What is retained fragment in 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.

How do I know if a fragment is attached?

Use isAdded() to check whether the fragment is attached and then to getResources() from activity.

What is getActivity?

54. Two likely definitions: getActivity() in a Fragment returns the Activity the Fragment is currently associated with. (see http://developer.android.com/reference/android/app/Fragment.html#getActivity()). getActivity() is user-defined.

What is a FragmentActivity?

A FragmentActivity is a subclass of Activity that was built for the Android Support Package. The FragmentActivity class adds a couple new methods to ensure compatibility with older versions of Android, but other than that, there really isn’t much of a difference between the two.

Is it better to use activity or fragment?

It is always hosted by an activity. 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….Difference Table.

Activity	Fragment
Activity can exist without a Fragment	Fragment cannot be used without an Activity.

What is a ViewPager?

ViewPager in Android is a class that allows the user to flip left and right through pages of data. This class provides the functionality to flip pages in app. It is a widget found in the support library. To use it you’ll have to put the element inside your XML layout file that’ll contain multiple child views.

Why do we use headless fragments?

Fragments can be used without defining a user interface. It is recommended to use headless fragments for your background processing.

What is setRetainInstance true?

It’s part of the articles of lifecycle: start reading from Understand lifecycle of Activity and Fragment, Introduction. The Fragment. setRetainInstance() method control whether a fragment instance is retained across Activity re-creation (such as from a configuration change).

What is the fragment life cycle in Android?

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.

How do you know if a fragment is destroyed?

Since all fragments are destroyed if the activity is destroyed, a simple answer could be calling getActivity(). isDestroyed() returning true if the activity is destroyed, therefore the fragment is destroyed.