Android Studio opens your project in a window, as shown in Figure 1.8.

The different panes of the project window are called Tool Windows.

The lefthand view is the project tool window. From here, you can view and manage the files associated with your project.

The middle view is the editor. To get you started, Android Studio has opened activity_quiz.xml in the editor. (If you see an image in the editor, click the Text tab at the bottom.) You can also see a preview of that file on the righthand side.

Figure 1.8  A fresh project window

You can toggle the visibility of the various tool windows by clicking on their names in the strip of tool buttons on the left, right, or bottom of the screen. There are keyboard shortcuts for many of these as well. If you do not see the tool button strips, click the gray square button in the lower left corner of the main window or choose View → Tool Buttons.