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Graphical User Interface | Android Programming | ProgrammerGuide.Net | Step by Step Guide

The graphical user interface for an Android application is constructed by a hierarchy of View and ViewGroup objects.

View objects

View objects are UI widgets such as buttons or text fields.


ViewGroup objects defines the layout of the child view like in a grid or a vertical list. Basically, ViewGroup are invisible view containers.


Android provides an XML vocabulary to define your UI in XML using a hierarchy of UI elements. We can define subclasses of View and ViewGroup in the XML.

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