Each project in Android Studio contains one or more
modules with source code files and resource files. Types of modules include:
·
Android
app modules
·
Library
modules
·
Google
App Engine modules
By default, Android Studio displays your project files in
the Android project view, as shown in figure 1. This view is organized by
modules to provide quick access to your project's key source files.

·
manifests: Contains the AndroidManifest.xml
file.
·
java: Contains the Java source code
files, including JUnit test code.
·
res: Contains all non-code resources,
such as XML layouts, UI strings, and bitmap images.
The Android project structure on disk differs from this
flattened representation. To see the actual file structure of the project,
select Project from the Project dropdown (in figure 1, it's
showing as Android).
You can also customize the view of the project files to
focus on specific aspects of your app development. For example,
selecting the Problems view of your project displays links to the source files containing any recognized coding and syntax errors, such as a missing XML element closing tag in a layout file.
selecting the Problems view of your project displays links to the source files containing any recognized coding and syntax errors, such as a missing XML element closing tag in a layout file.
Figure 2. The project files in
Problems view, showing a layout file with a problem.