Manage remote repositories

When your dependency is something other than a local library or file tree, Gradle looks for the files in whichever online repositories are specified in the dependencyResolutionManagement { repositories {...} } block of your settings.gradle file. The order in which you list each repository determines the order in which Gradle searches the repositories for each project dependency. For example, if a dependency is available from both repository A and B, and you list A first, Gradle downloads the dependency from repository A.

By default, new Android Studio projects specify Google's Maven repository, and the Maven central repository as repository locations in the project's settings.gradle file, as shown below:

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
    }
}

If you want something from a local repository use mavenLocal():

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        mavenLocal()
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        mavenLocal()
    }
}

Or you can declare specific Maven or Ivy repositories as follows:

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        maven(url = "https://repo.example.com/maven2")
        maven(url = "file://local/repo/")
        ivy(url = "https://repo.example.com/ivy")
    }
}

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        maven {
            url 'https://repo.example.com/maven2'
        }
        maven {
            url 'file://local/repo/'
        }
        ivy {
            url 'https://repo.example.com/ivy'
        }
    }
}

For more information, see the Gradle Repositories guide.

Google's Maven repository

The most recent versions of the following Android libraries are available from Google's Maven repository:

• AndroidX Libraries
• Architecture Components Library
• Constraint Layout Library
• AndroidX Test
• Databinding Library
• Android Instant App Library
• Wear OS
• Google Play services
• Google Play Billing Library
• Firebase

You can see all available artifacts at Google's Maven repository index (see below for programmatic access).

To add one of these libraries to your build, include Google's Maven repository in your top-level build.gradle.kts file:

dependencyResolutionManagement {

    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()

        // If you're using a version of Gradle lower than 4.1, you must instead use:
        // maven {
        //     url = "https://maven.google.com"
        // }
        // An alternative URL is "https://dl.google.com/dl/android/maven2/".
    }
}

dependencyResolutionManagement {

    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()

        // If you're using a version of Gradle lower than 4.1, you must instead use:
        // maven {
        //     url 'https://maven.google.com'
        // }
        // An alternative URL is 'https://dl.google.com/dl/android/maven2/'.
    }
}

Then add the desired library to your module's dependencies block. For example,the appcompat library looks like this:

dependencies {
    implementation("com.android.support:appcompat-v7:28.0.0")
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.6.1'
}

However, if you're trying to use an older version of the above libraries and your dependency fails, then it's not available in the Maven repository and you must instead get the library from the offline repository.

Programmatic access

For programmatic access to Google's Maven artifacts, you can get an XML list of artifact groups from maven.google.com/master-index.xml. Then, for any group, you can view its library names and versions at:

maven.google.com/group_path/group-index.xml

For example, libraries in the android.arch.lifecycle group are listed at maven.google.com/android/arch/lifecycle/group-index.xml.

You can also download the POM and JAR files at:

maven.google.com/group_path/library/version /library-version.ext

For example: maven.google.com/android/arch/lifecycle/compiler/1.0.0/compiler-1. 0.0.pom.

Offline repository from SDK Manager

For libraries not available from the Google Maven repository (usually older library versions), you must download the offline Google Repository package from the SDK Manager.

Then you can add these libraries to your dependencies block as usual.

The offline libraries are saved in android_sdk/extras/.