What is a layout Android?
In Android the term layout refers to defining how the View components are displayed on the screen relative to each other. A layout is typically defined partly by the View and partly by the ViewGroup which contains the View .
What is an interface in Android?
The user interface (UI) for an Android app is built as a hierarchy of layouts and widgets. The layouts are ViewGroup objects, containers that control how their child views are positioned on the screen. Widgets are View objects, UI components such as buttons and text boxes.
What is padding in Android?
Padding in Android is used to add a blank space between a view and its contents. Margins, on the other hand, are used to add a space between two different views.
What are the main features of Android?
Features of Android
| Sr.No. | Feature & Description |
|---|---|
| 1 | Beautiful UI Android OS basic screen provides a beautiful and intuitive user interface. |
| 2 | Connectivity GSM/EDGE, IDEN, CDMA, EV-DO, UMTS, Bluetooth, Wi-Fi, LTE, NFC and WiMAX. |
| 3 | Storage SQLite, a lightweight relational database, is used for data storage purposes. |
Why interface is used in Android?
It is used to provide total abstraction. That means all the methods in an interface are declared with an empty body and are public and all fields are public, static, and final by default. A class that implements an interface must implement all the methods declared in the interface.
Why do we need interface in Android?
The benefit of interface is it allows multiple inheritance that thing is not possible with concrete classes and abstract classes. With interfaces, implements keyword is to be used for implementing. Implements tells the compiler that whatever classes are there after implementation, they are interfaces.
What is Match_parent and Wrap_content in android?
fill_parent and match_parent are the same, used when we want the height or width of a view to be as big as its parent view, fill_parent being deprecated. wrap_content is used when we want the view to occupy only as much space as required by it. You may also read : Android UI Layouts.
What is Dimen Activity_vertical_margin?
@dimen refers to dimension and it’s a file where you define dimensions to use them later from in any layout file. It’s located in res/values/dimens . Here’s what a sample of the file look like: <!– Default screen margins, per the Android Design guidelines.</p>
What is a button in Android?
Advertisements. A Button is a Push-button which can be pressed, or clicked, by the user to perform an action.
What is a linear layout in Android?
Linear Layout. LinearLayout is a view group that aligns all children in a single direction, vertically or horizontally. You can specify the layout direction with the android:orientation attribute.
What is Android layout gravity?
Strictly speaking android:gravity is not a Layout Param. The android:gravity is really an attribute of the View Group. It controls the way the contents of the View Group will be positioned horizontally and vertically. In the above example the top Linear Layout is a horizontal Linear Layout.
How does Android draw views?
How Android Draws Views. Drawing begins with the root node of the layout. It is requested to measure and draw the layout tree. Drawing is handled by walking the tree and rendering each View that intersects the invalid region. In turn, each ViewGroup is responsible for requesting each of its children to be drawn (with the draw () method)…
How does constraint layout work in Android?
Android ConstraintLayout is used to define a layout by assigning constraints for every child view/widget relative to other views present . A ConstraintLayout is similar to a RelativeLayout, but with more power. The aim of ConstraintLayout is to improve the performance of the applications by removing the nested views with a flat and flexible design.