Multiple Modules in Android Library

Applications are now migrating to a modularized structure in order to attain quicker Gradle builds, reuse code across functionalities and to create slicker Git flows by splitting the team between the different modules.

Let us assume that we want to use library features that are not released yet but are implemented on Github or Bitbucket repository. So in order to directly use those features we can include that library as subproject in our application and we can use those features and test.
Simplest solution to include android library with multiple modules into your application project is to follow these steps:

1. Download the library (using Git, or a zip archive to unzip)

2. Create a folder “subProject” in your project.

3. Copy and paste the Downloaded Library folder to your subProject folder.

4. On the root of your project directory create/modify the settings.gradle file. It should contain something like the following: include ‘:MyApp’

Note: Let us assume we want to use ModuleA and ModuleB of library in your application

5. Copy the following lines above include ‘:MyApp’:

include ':ModuleA', ':ModuleB'
rootProject.children.each { project ->
   String relativeProjectPath = project.projectDir.path.replace(settingsDir.path, "")
   project.projectDir = new File("subProject/$relativeProjectPath")
}
include ':MyApp'

6. Gradle clean & build/close the project and reopen/re-import it.

7. Edit your project’s build.gradle to add this in the “dependencies” section:

a.	dependencies {
//…
implementation project(':ModuleA')
implementation project(':ModuleB')
} 

8. Sync the gradle and voilà you can use the library in your project.

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