90.5 Designing the User Interface
In the interests of keeping the example as simple as possible, the only visual element within the user interface will be a Button view. Locate and select the activity_main.xml layout resource file to load it into the Layout Editor tool.
Delete the sample TextView object, drag and drop a Button object from the Common category of the palette and position it in the center of the layout canvas. Using the Attributes tool window, change the text property on the button to “Authenticate” and extract the string to a resource. Finally, configure the onClick property to call a method named authenticateUser.
On completion of the above steps the layout should match that shown in Figure 90-2:
Figure 90-2
