What are the different ViewGroup in Android?

What is android ViewGroup?

A ViewGroup is a special view that can contain other views. The ViewGroup is the base class for Layouts in android, like LinearLayout , RelativeLayout , FrameLayout etc. In other words, ViewGroup is generally used to define the layout in which views(widgets) will be set/arranged/listed on the android screen.

Which of the following are ViewGroup?

Android contains the following commonly used ViewGroup subclasses: LinearLayout. RelativeLayout. ListView.

What is layout and its types in android?

Layouts Part of Android Jetpack. A layout defines the structure for a user interface in your app, such as in an activity. All elements in the layout are built using a hierarchy of View and ViewGroup objects. A View usually draws something the user can see and interact with.

What is the difference between View and ViewGroup?

A view is a small rectangular box that responds to user inputs. Eg: EditText, Button, CheckBox, etc. ViewGroup is an invisible container of other views (child views) and other ViewGroup.

Difference Table.

View ViewGroup
View refers to the android.view.View class ViewGroup refers to the android.view.ViewGroup class

What is the main purpose of a ViewGroup?

What is the main purpose of a ViewGroup? It groups together the most common views that developers use in Android apps. It serves as a container for View objects, and is responsible for arranging the View objects within it. It is required to make a view interactive as a way to group TextViews on a screen.

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What are view and ViewGroup classes in Android?

ViewGroup is the base class for layouts and view containers. View is the SuperClass of All component like TextView, EditText, ListView, etc.. while ViewGroup is Collection of Views (TextView, EditText, ListView, etc..) , somewhat like container.

What is ScrollView in Android?

In Android, a ScrollView is a view group that is used to make vertically scrollable views. A scroll view contains a single direct child only. … A ScrollView supports Vertical scrolling only, so in order to create a horizontally scrollable view, HorizontalScrollView is used.

What are the 4 types of app components?

There are four different types of app components:

  • Activities.
  • Services.
  • Broadcast receivers.
  • Content providers.

What are application widgets in android?

App widgets are miniature application views that can be embedded in other applications (such as the home screen) and receive periodic updates. These views are referred to as widgets in the user interface, and you can publish one with an app widget provider (or widget provider).

What is descendantFocusability in android?

When your activity resumes the first editText takes focus and the softInputKeyboard pops up. If you don’t want that to happens and you want the user to decide which view to fill in first, you add the attribute android:descendantFocusability=”beforeDescendants” to the parent view and your problem is solved.