Lately I have been needing to manage a number of dependencies within a multi-project Android application. I borrowed some project setup tips by perusing the Hibernate github repo to streamline dependencies that were shared across multiple sub-projects.

Example Project Structure

From this project structure I typically have depencencies that belong in both project-one and project-two. I can put these dependecies in the RootProject and reference them from the sub-projects. This allows me to ensure I get the same version of dependencies across all projects.

In my root project build.gradle file I add the dependencies.

//root-project
ext {

    daggerVersion = '1.2.0'
    retrofitVersion = '1.2.2'

    libs = [
            dagger         : ('com.squareup.dagger:dagger:' + daggerVersion),
            daggerCompiler : ('com.squareup.dagger:dagger-compiler:' + daggerVersion),
            retrofit       : ('com.squareup.retrofit:retrofit:' + retrofitVersion)
    ]

}

We can then reference these dependencies in both sub-projects

//project-one
dependencies {

    compile libs.dagger
    compile libs.daggerCompiler
    compile libs.retrofit

}
//project-two
dependencies {

    compile libs.dagger
    compile libs.daggerCompiler
    compile libs.retrofit

}
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