Initially, no project or file is displayed in the main view of Android Studio, as you can see in the next screenshot. As Android Studio suggests, press Alt + 1 to open the project view. You can also open it by clicking on the Project button on the left edge of the screen.

The Project view shows the list of open projects. These projects are displayed in a hierarchical view.

We can change the type of view to Project, Packages, or Android from the upper-left corner of the project explorer, as shown in the following screenshot. The Project view shows the directory structure of the project. The Packages view shows only the package structure. The Android view shows only the folders where you, as a developer, will include or edit your application files. These folders are related only to the Android application listed in a simplified structure: the java classes folder, the res resources folder, the manifest file, and the Gradle scripts.

In the upper-right corner of the...