View is a basic building block of UI (User Interface) in android. 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. Eg: LinearLayout is a ViewGroup that can contain other views in it.
What is the use of view in android?
View. A View occupies a rectangular area on the screen and is responsible for drawing and event handling. The View class is a superclass for all GUI components in Android.
What is view in android with example?
The View is a base class for all UI components in android. For example, the EditText class is used to accept the input from users in android apps, which is a subclass of View . Following are the some of common View subclasses that will be used in android applications.
What is the android View group?
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.
What are view and view group classes in android?
A ViewGroup is a special view that can contain other views (called children.) The view group is the base class for layouts and views containers. This class also defines the ViewGroup. LayoutParams class which serves as the base class for layouts parameters.
What is view and how it works in android?
View objects are used specifically for drawing content onto the screen of an Android device. While you can instantiate a View in your Java code, the easiest way to use them is through an XML layout file. An example of this can be seen when you create an simple “Hello World” application in Android Studio.
What are the types of views in android?
Types of Android Views
- Image Button.
- Date Picker.
- CheckBox buttons.
- Image View.
What is the use of ConstraintLayout in Android?
A ConstraintLayout is a ViewGroup which allows you to position and size widgets in a flexible way. Note: ConstraintLayout is available as a support library that you can use on Android systems starting with API level 9 (Gingerbread).
What is the main purpose of view group?
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.
What are different types of layouts used in Android?
Android Layout Types
LinearLayout is a view group that aligns all children in a single direction, vertically or horizontally. RelativeLayout is a view group that displays child views in relative positions. TableLayout is a view that groups views into rows and columns.
Is android a virtual machine?
Android has gained significant popularity in the smartphone market since its introduction in 2007. While Android applications are written in Java, Android uses its own virtual machine called Dalvik. Other smartphone platforms, most notably Apple’s iOS, do not permit the installation of any kind of virtual machine.
Is layout a view 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 broadcast receiver in android?
Broadcast receiver is an Android component which allows you to send or receive Android system or application events. … For example, applications can register for various system events like boot complete or battery low, and Android system sends broadcast when specific event occur.