Run the app to see the change. You can look in the small horizontal status bar at the very bottom of Android Studio for messages to see the progress.
Android Studio uses Gradle as its build system. You might need to scroll the panel to see all the fields.
If you get a dialog box saying "Instant Run requires that the platform corresponding to your target device Android N Accept the default project location. Click the app 1 folder to expand the hierarchy of files. In the Design tab, notice that the entire background of the screen uses the screenBackground color.
Explore width and height properties Now that you have a new screen background color, you will use it to explore the effects of changing the width and height properties of views. In the Text tab, take a look at the XML code for the button. Press Enter to complete the selection. It starts out with a skeleton unit test file.