To give your application some "face" you will have to somehow define the UI. The Android API gives you two ways how to do it. You can write your app's UI directly in the Java code using objects and their methods or you can define it through a XML file. I guess that the most of programmers (including me) will choose the second option.
The Basic units of a user interface are Views and ViewGroups. Those basic screen elements are held in a tree structure as shown on a picture below. Every View represents some screen widget (TextView, EditView, Button etc.) and every ViewGroup serves as a base class for layouts.
The Basic units of a user interface are Views and ViewGroups. Those basic screen elements are held in a tree structure as shown on a picture below. Every View represents some screen widget (TextView, EditView, Button etc.) and every ViewGroup serves as a base class for layouts.
Next time we will provide you with some examples of a simple UIs using several layouts.Source: Google Android
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