Local dependencies

Gradle allows to use dependencies from the local binaries or other projects.

dependencies {
    // dependency on a subproject (module)
    implementation(project(":mylibrary"))
    
    // dependency on a local binary file
    implementation(files("libs/lib.jar"))
    
    // dependency on local binaries
    implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar"))))  
}

dependencies {
    // dependency on a subproject (module)
    implementation project(":mylibrary")
    
    // dependency on a local binary file
    implementation files('libs/lib.jar')
    
    // dependency on local binaries
    implementation fileTree(dir: 'libs', include: ['*.jar'])
}

For adding local module as dependency you must have module in the top-level settings.gradle file:

include ':mylibrary', ':mymodule'

You can add directory with binaries as repository.

// looks for jars in the libs directory and its child directories.
repositories {
        flatDir {
            dirs ("libs")
        }
    }

// looks for jars in the libs directory and its child directories.
repositories {
    flatDir {
        dirs 'libs'
    }
}

dependency on project

You can add dependency on other project like module in build.gradle.

implementation project( ':mylib' )

Also you should include project in the top-level settings.gradle file.

include ':mylib', ...
project(':mylib').projectDir = file('~/workspace/mylib/')
// project(':mylib').projectDir = file('../mylib/')