How to add .aar dependency in library module?

I am having one .aar file of one library module.
I want to use it as a library or dependency in my other project's library module.
How do I do it?

I tried options provided at below links:
http://kevinpelgrims.com/blog/2014/05/18/reference-a-local-aar-in-your-android-project/

It works only if I add .aar reference in my project's application module. But not working in library module.

Thanks.

Follow this setting and you will able to add .aar dependency to library module

build.gradle (Project: ....)

allprojects {
    repositories {
        jcenter()
        mavenCentral()
        flatDir {
            dirs 'libs'
            dirs project(':library_module').file('libs')
        }
    }
}

build.gradle (Module: app)

dependencies {
    ...
    compile project(':library_module')
}

build.gradle (Module: library_module)

dependencies {
    ...
    compile(name:'aar_file_name', ext:'aar')
}

settings.gradle (Project Settings)

include ':app', ':library_module'

Gabriele Mariotti

In all modules (library or application) where you need the aar file you have to add in your build.gradle the repository:

repositories {
    flatDir {
        dirs 'libs'
    }
}

and add the dependency:

dependencies {
   compile(name:'nameOfYourAARFileWithoutExtension', ext:'aar')
 }

You can use the top-level file to add the repositories, but you can't add the dependencies in the top-level file.
Pay attention to the relative path of the libs folder that you are using in the module.

File -> New Module -> Import .JAR/.AAR
import the .AAR file.
in library module build.gradle add the dependency dependencies{compile project(':Name-Of-Your-Module-aar')}

http://tools.android.com/tech-docs/new-build-system/tips#TOC-Handling-transitive-dependencies-for-local-artifacts-jars-and-aar-

I did it a bit differently than others have posted here...

My main goal was to create a library module that contained all the jar's and aar's that I would need. My main project would then depend on this library module - I only wanted a single line in the main project's build.gradle to link this dependency.

Add a new library module to the project: File -> New -> New Module -> Android Library
within the library module, open the build.gradle and add:

// so that the library project can locate the aar in /libs
repositories {
    flatDir {
        dirs 'libs'
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation fileTree(include: ['*.aar'], dir: 'libs')
}

now you can pop all the jar's and aar's into the /libs folder of your library module. Bonus: whatever the library name is doesn't matter, it's automatically discovered

Sorry process involves 10 steps but these are super simple and easy.

1- New->Module