How to include aar files used in library projects in main project in Android

Question

My project is including some library project. Library is using some aar files and its dependecny is already defined in the module: gradle file. I am facing problem in includ

Answer 1

Monika Moon put me on the correct path but I don't have enough rep points to comment inline above. sigh

So a default Android app built in 2020 with Android Studio 3.5.3 will have the following project structure via the Project View:

--[yourAppName]
  --[app]
  --[gradle]
  build.gradle 

In the top level build.gradle files add the 'flatDir' item :

allprojects {
        repositories {
            google()
            jcenter()

            // needed so it picks up my aar files
            flatDir {
                dirs 'libs'
            }
        }
}

Then in your 'app' folder shown above. You will have these two key resources:

 -- [libs] folder where you should drop your aar files
 build.gradle file that is the one you add your aar dependencies to.

The default project build will already contain a 'libs' include for you but just in case your version doesn't have it this is what you need to add:

dependencies {
    implementation fileTree(dir: './libs', include: ['*.jar'])
    implementation(name: 'fileNameBeforeExtension', ext:'aar')

This is clean and works as expected.

The AAR file I'm using is an in-house custom built for internal hardware and will never be on a public repot.