Click on the small arrow on the left-hand side of each folder to expand its view:
As you can see, we have multiple folders in our project folder. Our main project folder contains three subfolders, which are manifest, java, and res; we will explore each of these folders individually now:
manifest: This folder contains your AndroidManifest.xml file, which is responsible for giving permissions to your app, as we learned in the preceding chapter.
java: This folder contains all your .java files, which are your Java code files. Generally, this folder has multiple ...