You’ll now create the Welcome app’s GUI. The IDE’s Graphical Layout editor allows you to build your GUI by dragging and dropping GUI components—such as TextView
s, ImageView
s and Button
s—onto an app. By default, the GUI layout for a Blank App is stored in an XML file called activity_main.xml, located in the project’s res
folder in the layout
subfolder. In this chapter, we’ll use the Graphical Layout editor and the Outline window to build the app and will not study the generated XML. The Android development tools have improved to the point that, in most cases, you do not need to manipulate the XML markup directly.