We finished our second tutorial by creating a new android application project. Now is the best time to look at our folder structure and understand what each subfolder is used for and all the files present in our new android application project.

But before we dig into it, this is how my folder structure looks like. Please note that the folder structure might be slightly different depending on the kind of android IDE or the version of android SDK you are using.

android development

I have decide that it is better you read more about what all the sub-folder and files are for before we even start coding. This piece of information below was adopted from android website here

Android Projects

Android projects are the projects that eventually get built into an .apk file that you install onto a device. They contain things such as application source code and resource files. Some are generated for you by default, while others should be created if required. The following directories and files comprise an Android project:


Contains your stub Activity file, which is stored at src/your/package/namespace/ All other source code files (such as .java or .aidl files) go here as well.


Output directory of the build. This is where you can find the final .apk file and other compiled resources.


Contains native code sources developed using the Android NDK. For more information, see the Android NDK documentation.


Contains the Java files generated by ADT, such as your file and interfaces created from AIDL files.


This is empty. You can use it to store raw asset files. Files that you save here are compiled into an .apk file as-is, and the original filename is preserved. You can navigate this directory in the same way as a typical file system using URIs and read files as a stream of bytes using the AssetManager. For example, this is a good location for textures and game data.


Contains application resources, such as drawable files, layout files, and string values. See Application Resources for more information.


For XML files that are compiled into animation objects. See the Animation resource type.


For XML files that describe colors. See the Color Values resource type.


For bitmap files (PNG, JPEG, or GIF), 9-Patch image files, and XML files that describe Drawable shapes or Drawable objects that contain multiple states (normal, pressed, or focused). See the Drawable resource type.


XML files that are compiled into screen layouts (or part of a screen). See the Layout resource type.


For XML files that define application menus. See the Menus resource type.


For arbitrary raw asset files. Saving asset files here instead of in the assets/ directory only differs in the way that you access them. These files are processed by aapt and must be referenced from the application using a resource identifier in the R class. For example, this is a good place for media, such as MP3 or Ogg files.


For XML files that are compiled into many kinds of resource. Unlike other resources in the res/ directory, resources written to XML files in this folder are not referenced by the file name. Instead, the XML element type controls how the resources is defined within them are placed into the R class.


For miscellaneous XML files that configure application components. For example, an XML file that defines a PreferenceScreen, AppWidgetProviderInfo, or Searchability Metadata. See Application Resources for more information about configuring these application components.



Contains private libraries.


The control file that describes the nature of the application and each of its components. For instance, it describes: certain qualities about the activities, services, intent receivers, and content providers; what permissions are requested; what external libraries are needed; what device features are required, what API Levels are supported or required; and others. See the AndroidManifest.xml documentation for more information

This file contains project settings, such as the build target. This file is integral to the project, so maintain it in a source revision control system. To edit project properties in Eclipse, right-click the project folder and select Properties.

Customizable computer-specific properties for the build system. If you use Ant to build the project, this contains the path to the SDK installation. Because the content of the file is specific to the local installation of the SDK, the should not be maintained in a source revision control system. If you use Eclipse, this file is not used.

Customizable properties for the build system, you can edit this file to override default build settings used by Ant and also provide the location of your keystore and key alias so that the build tools can sign your application when building in release mode. This file is integral to the project, so maintain it in a source revision control system. If you use Eclipse, this file is not used.


The Ant build file for your project. This is only applicable for projects that you build with Ant.

I am looking unto the next tutorial. Don’t forget to drop questions if you have any.

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