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YourĪpp can create View and ViewGroup objects (and manipulate their properties) programmatically.ĭeclaring your UI in XML allows you to separate the presentation of your app from the code thatĬontrols its behavior. Instantiate layout elements at runtime.To build your XML layout using a drag-and-drop interface. You can also use Android Studio's Layout Editor

Vocabulary that corresponds to the View classes and subclasses, such as those for widgets and Provide a different layout structure, such as LinearLayout or ViewGroup objects are usually called "layouts" can be one of many types that The View objects are usually called "widgets" and can be one of many Illustration of a view hierarchy, which defines a Invisible container that defines the layout structure for View and otherįigure 1. A layout defines the structure for a user interface in your app, such as in an activity.Īll elements in the layout are built using a hierarchy of View andĭraws something the user can see and interact with.