Android Tutorial - creating GUI - converter app

Step 1: Open src > main > res > activity-main.xml

• Use "Design" view to bring desired Views
• Use "Text" view to edit XML

Read about Spinner:

http://developer.android.com/guide/topics/ui/controls/spinner.html

Read about Toast:

http://developer.android.com/guide/topics/ui/notifiers/toasts.html