We can examine the project structure in the project navigation pane. The project structure includes a folder with the name of our application. This folder contains the application structure and files. The most important elements of the application structure are in the app directory. These include:
build/: This is a folder that contains the resources compiled after building the application and the classes generated by the Android tools, such as theR.javafile, which contains references to the application resources.libs/: This is a folder that contains the libraries referenced from our code.src/androidTest/: This is a folder that contains the test classes of the Java classes that need to be tested.src/main/: This is a folder that contains the sources of our application. All the files we usually work with are in this folder. Themainfolder is subdivided as follows: