LibraryExtension

interface LibraryExtension : CommonExtension<LibraryBuildFeatures, LibraryBuildType, LibraryDefaultConfig, LibraryProductFlavor>, TestedExtension

Extension for the Android Library Gradle Plugin.

This is the android block when the com.android.library plugin is applied.

Only the Android Gradle Plugin should create instances of interfaces in com.android.build.api.dsl.

Summary

Public methods

abstract Unit

Customizes publishing build variant artifacts from library module to a Maven repository.

Inherited functions

Unit aaptOptions(action: AaptOptions.() -> Unit)

Specifies options for the Android Asset Packaging Tool (AAPT).

For more information about the properties you can configure in this block, see AaptOptions.

Unit adbOptions(action: AdbOptions.() -> Unit)

Specifies options for the Android Debug Bridge (ADB), such as APK installation options.

For more information about the properties you can configure in this block, see AdbOptions.

Unit androidResources(action: AndroidResources.() -> Unit)

Specifies options related to the processing of Android Resources.

For more information about the properties you can configure in this block, see AndroidResources.

Unit buildFeatures(action: BuildFeaturesT.() -> Unit)

A list of build features that can be enabled or disabled on the Android Project.

Unit buildToolsVersion(buildToolsVersion: String)

Unit buildTypes(action: NamedDomainObjectContainer<BuildTypeT>.() -> Unit)

Encapsulates all build type configurations for this project.

For more information about the properties you can configure in this block, see BuildType

Unit compileOptions(action: CompileOptions.() -> Unit)

Specifies Java compiler options, such as the language level of the Java source code and generated bytecode.

For more information about the properties you can configure in this block, see CompileOptions.

Unit compileSdkAddon(vendor: String, name: String, version: Int)

Unit compileSdkVersion(apiLevel: Int)

Unit compileSdkVersion(version: String)

Unit composeOptions(action: ComposeOptions.() -> Unit)

Unit dataBinding(action: DataBinding.() -> Unit)

Specifies options for the Data Binding Library.

For more information about the properties you can configure in this block, see DataBinding

Unit debug(action: BuildTypeT.() -> Unit)

Shortcut extension method to allow easy access to the predefined debug BuildType

For example:

 android {
     buildTypes {
         debug {
             // ...
         }
     }
}

Unit defaultConfig(action: DefaultConfigT.() -> Unit)

Specifies defaults for variant properties that the Android plugin applies to all build variants.

You can override any defaultConfig property when configuring product flavors

For more information about the properties you can configure in this block, see DefaultConfig.

Unit externalNativeBuild(action: ExternalNativeBuild.() -> Unit)

Specifies options for external native build using CMake or ndk-build.

When using Android Studio 2.2 or higher with Android plugin 2.2.0 or higher, you can compile C and C++ code into a native library that Gradle packages into your APK.

To learn more, read Add C and C++ Code to Your Project.

Unit flavorDimensions(vararg dimensions: String)

File getDefaultProguardFile(name: String)

Unit installation(action: Installation.() -> Unit)

Specifies options for the Android Debug Bridge (ADB), such as APK installation options.

For more information about the properties you can configure in this block, see AdbOptions.

Unit jacoco(action: JacocoOptions.() -> Unit)

Configure the gathering of code-coverage from tests.

This is replaced by testCoverage.

Unit lint(action: Lint.() -> Unit)

Specifies options for the lint tool.

For more information about the properties you can configure in this block, see Lint.

Unit lintOptions(action: LintOptions.() -> Unit)

Specifies options for the lint tool.

For more information about the properties you can configure in this block, see LintOptions.

Unit packagingOptions(action: PackagingOptions.() -> Unit)

Specifies options and rules that determine which files the Android plugin packages into your APK.

For more information about the properties you can configure in this block, see PackagingOptions.

Unit productFlavors(action: NamedDomainObjectContainer<ProductFlavorT>.() -> Unit)

Encapsulates all product flavors configurations for this project.

For more information about the properties you can configure in this block, see ProductFlavor

Unit release(action: BuildTypeT.() -> Unit)

Shortcut extension method to allow easy access to the predefined release BuildType

For example:

 android {
     buildTypes {
         release {
             // ...
         }
     }
}

Unit signingConfigs(action: NamedDomainObjectContainer<out ApkSigningConfig>.() -> Unit)

Encapsulates signing configurations that you can apply to BuildType and ProductFlavor configurations.

For more information about the properties you can configure in this block, see ApkSigningConfig.

Unit sourceSets(action: NamedDomainObjectContainer<out AndroidSourceSet>.() -> Unit)

Encapsulates source set configurations for all variants.

Note that the Android plugin uses its own implementation of source sets. For more information about the properties you can configure in this block, see AndroidSourceSet.

Unit splits(action: Splits.() -> Unit)

Specifies configurations for building multiple APKs or APK splits.

For more information about the properties you can configure in this block, see Splits.

Unit testCoverage(action: TestCoverage.() -> Unit)

Configure the gathering of code-coverage from tests.

To override the JaCoCo version that is used for offline instrumentation and coverage report, add the following to build.gradle file:

android {
    testCoverage {
        jacocoVersion "<jacoco-version>"
    }
}

For more information about the properties you can configure in this block, see TestCoverage.

Unit testOptions(action: TestOptions.() -> Unit)

Specifies options for how the Android plugin should run local and instrumented tests.

For more information about the properties you can configure in this block, see TestOptions.

Unit useLibrary(name: String)

Includes the specified library to the classpath.

You typically use this property to support optional platform libraries that ship with the Android SDK. The following sample adds the Apache HTTP API library to the project classpath:

android {
    // Adds a platform library that ships with the Android SDK.
    useLibrary 'org.apache.http.legacy'
}

To include libraries that do not ship with the SDK, such as local library modules or binaries from remote repositories, add the libraries as dependencies in the dependencies block. Note that Android plugin 3.0.0 and later introduce new dependency configurations. To learn more about Gradle dependencies, read Dependency Management Basics.

Unit useLibrary(name: String, required: Boolean)

Includes the specified library to the classpath.

You typically use this property to support optional platform libraries that ship with the Android SDK. The following sample adds the Apache HTTP API library to the project classpath:

android {
    // Adds a platform library that ships with the Android SDK.
    useLibrary 'org.apache.http.legacy'
}

To include libraries that do not ship with the SDK, such as local library modules or binaries from remote repositories, add the libraries as dependencies in the dependencies block. Note that Android plugin 3.0.0 and later introduce new dependency configurations. To learn more about Gradle dependencies, read Dependency Management Basics

Unit testFixtures(action: TestFixtures.() -> Unit)

Options to configure the test fixtures.

Properties

abstract MutableCollection<String>?

Aidl files to package in the aar.

abstract NamedDomainObjectContainer<PrefabPackagingOptions>

container of Prefab options

abstract LibraryPublishing

Customizes publishing build variant artifacts from library module to a Maven repository.

Inherited properties

AaptOptions aaptOptions

Specifies options for the Android Asset Packaging Tool (AAPT).

For more information about the properties you can configure in this block, see AaptOptions.

AdbOptions adbOptions

Specifies options for the Android Debug Bridge (ADB), such as APK installation options.

For more information about the properties you can configure in this block, see AdbOptions.

AndroidResources androidResources

Specifies options related to the processing of Android Resources.

For more information about the properties you can configure in this block, see AndroidResources.

BuildFeaturesT buildFeatures

A list of build features that can be enabled or disabled on the Android Project.

String buildToolsVersion

Specifies the version of the SDK Build Tools to use when building your project.

When using Android plugin 3.0.0 or later, configuring this property is optional. By default, the plugin uses the minimum version of the build tools required by the version of the plugin you're using. To specify a different version of the build tools for the plugin to use, specify the version as follows:

android {
    // Specifying this property is optional.
    buildToolsVersion "26.0.0"
}

For a list of build tools releases, read the release notes.

Note that the value assigned to this property is parsed and stored in a normalized form, so reading it back may give a slightly different result.

NamedDomainObjectContainer<out BuildTypeT> buildTypes

Encapsulates all build type configurations for this project.

Unlike using ProductFlavor to create different versions of your project that you expect to co-exist on a single device, build types determine how Gradle builds and packages each version of your project. Developers typically use them to configure projects for various stages of a development lifecycle. For example, when creating a new project from Android Studio, the Android plugin configures a 'debug' and 'release' build type for you. By default, the 'debug' build type enables debugging options and signs your APK with a generic debug keystore. Conversely, The 'release' build type strips out debug symbols and requires you to create a release key and keystore for your app. You can then combine build types with product flavors to create build variants.

CompileOptions compileOptions

Specifies Java compiler options, such as the language level of the Java source code and generated bytecode.

For more information about the properties you can configure in this block, see CompileOptions.

Int? compileSdk

Specifies the API level to compile your project against. The Android plugin requires you to configure this property.

This means your code can use only the Android APIs included in that API level and lower. You can configure the compile sdk version by adding the following to the android block: compileSdk = 26.

You should generally use the most up-to-date API level available. If you are planning to also support older API levels, it's good practice to use the Lint tool to check if you are using APIs that are not available in earlier API levels.

The value you assign to this property is parsed and stored in a normalized form, so reading it back may return a slightly different value.

Int? compileSdkExtension

String? compileSdkPreview

Specify a preview API to compile your project against.

For example, to try out the Android S preview, rather than compileSdk = 30 you can use compileSdkPreview = "S"

Once the preview APIs are finalized, they will be allocated a stable integer value.

ComposeOptions composeOptions

DataBinding dataBinding

Specifies options for the Data Binding Library.

For more information about the properties you can configure in this block, see DataBinding

DefaultConfigT defaultConfig

Specifies defaults for variant properties that the Android plugin applies to all build variants.

You can override any defaultConfig property when configuring product flavors

For more information about the properties you can configure in this block, see DefaultConfig.

MutableMap<String, Any> experimentalProperties

Additional per module experimental properties.

ExternalNativeBuild externalNativeBuild

Specifies options for external native build using CMake or ndk-build.

When using Android Studio 2.2 or higher with Android plugin 2.2.0 or higher, you can compile C and C++ code into a native library that Gradle packages into your APK.

To learn more, read Add C and C++ Code to Your Project.

MutableList<String> flavorDimensions

Specifies the names of product flavor dimensions for this project.

When configuring product flavors with Android plugin 3.0.0 and higher, you must specify at least one flavor dimension, using the flavorDimensions property, and then assign each flavor to a dimension. Otherwise, you will get the following build error:

Error:All flavors must now belong to a named flavor dimension.
The flavor 'flavor_name' is not assigned to a flavor dimension.

By default, when you specify only one dimension, all flavors you configure automatically belong to that dimension. If you specify more than one dimension, you need to manually assign each flavor to a dimension, as shown in the sample below.

Flavor dimensions allow you to create groups of product flavors that you can combine with flavors from other flavor dimensions. For example, you can have one dimension that includes a 'free' and 'paid' version of your app, and another dimension for flavors that support different API levels, such as 'minApi21' and 'minApi24'. The Android plugin can then combine flavors from these dimensions—including their settings, code, and resources—to create variants such as 'debugFreeMinApi21' and 'releasePaidMinApi24', and so on. The sample below shows you how to specify flavor dimensions and add product flavors to them.

android {
    ...
    // Specifies the flavor dimensions you want to use. The order in which you
    // list each dimension determines its priority, from highest to lowest,
    // when Gradle merges variant sources and configurations. You must assign
    // each product flavor you configure to one of the flavor dimensions.
    flavorDimensions 'api', 'version'

    productFlavors {
      demo {
        // Assigns this product flavor to the 'version' flavor dimension.
        dimension 'version'
        ...
    }

      full {
        dimension 'version'
        ...
      }

      minApi24 {
        // Assigns this flavor to the 'api' dimension.
        dimension 'api'
        minSdkVersion '24'
        versionNameSuffix "-minApi24"
        ...
      }

      minApi21 {
        dimension "api"
        minSdkVersion '21'
        versionNameSuffix "-minApi21"
        ...
      }
   }
}

To learn more, read Combine multiple flavors.

Installation installation

Specifies options for the Android Debug Bridge (ADB), such as APK installation options.

For more information about the properties you can configure in this block, see AdbOptions.

JacocoOptions jacoco

Configure the gathering of code-coverage from tests.

This is replaced by testCoverage.

Lint lint

Specifies options for the lint tool.

For more information about the properties you can configure in this block, see Lint.

LintOptions lintOptions

Specifies options for the lint tool.

For more information about the properties you can configure in this block, see LintOptions.

String? namespace

The namespace of the generated R and BuildConfig classes. Also, the namespace used to resolve any relative class names that are declared in the AndroidManifest.xml.

This value supersedes any value specified by the package attribute in the source AndroidManifest.xml, but doing a 'get' on this property will not retrieve the value specified in the AndroidManifest.xml.

String? ndkPath

Requires the specified path to NDK be used.

Use this to specify a path to the NDK folder to be used for C and C++ builds.

android {
    // Path to custom NDK location
    ndkPath '/path/to/ndk'
}

If this field is specified then android.ndkVersion may not be specified.

For additional information about NDK installation see Install and configure the NDK.

String? ndkVersion

Requires the specified NDK version to be used.

Use this to specify a fixed NDK version. Without this, each new version of the Android Gradle Plugin will choose a specific version of NDK to use, so upgrading the plugin also means upgrading the NDK. Locking to a specific version can increase repeatability of the build.

android {
    // Use a fixed NDK version
    ndkVersion '20.1.5948944'
}

If this field is specified then android.ndkPath may not be specified.

The required format of the version is major.minor.build. It's not legal to specify less precision. If ndk.dir is specified in local.properties file then the NDK that it points to must match the android.ndkVersion.

Prior to Android Gradle Plugin version 3.5, the highest installed version of NDK will be used. In Android Gradle Plugin 3.4, specifying android.ndkVersion was not an error, but the value would be ignored. Prior to Android Gradle Plugin version 3.4, it was illegal to specify android.ndkVersion.

For additional information about NDK installation see Install and configure the NDK.

PackagingOptions packagingOptions

Specifies options and rules that determine which files the Android plugin packages into your APK.

For more information about the properties you can configure in this block, see PackagingOptions.

NamedDomainObjectContainer<out ProductFlavorT> productFlavors

Encapsulates all product flavors configurations for this project.

Product flavors represent different versions of your project that you expect to co-exist on a single device, the Google Play store, or repository. For example, you can configure 'demo' and 'full' product flavors for your app, and each of those flavors can specify different features, device requirements, resources, and application ID's--while sharing common source code and resources. So, product flavors allow you to output different versions of your project by simply changing only the components and settings that are different between them.

Configuring product flavors is similar to configuring build types: add them to the productFlavors block of your project's build.gradle file and configure the settings you want. Product flavors support the same properties as the defaultConfig block--this is because defaultConfig defines an object that the plugin uses as the base configuration for all other flavors. Each flavor you configure can then override any of the default values in defaultConfig, such as the applicationId.

When using Android plugin 3.0.0 and higher, each flavor must belong to aflavorDimensionvalue. By default, when you specify only one dimension, all flavors you configure belong to that dimension. If you specify more than one flavor dimension, you need to manually assign each flavor to a dimension. To learn more, read Use Flavor Dimensions for variant-aware dependency management.

When you configure product flavors, the Android plugin automatically combines them with your BuildType configurations to create build variants. If the plugin creates certain build variants that you don't want, you can filter variants.

String? resourcePrefix

Specifies this project's resource prefix to Android Studio for editor features, such as Lint checks. This property is useful only when using Android Studio.

Including unique prefixes for project resources helps avoid naming collisions with resources from other projects.

For example, when creating a library with String resources, you may want to name each resource with a unique prefix, such as "mylib_" to avoid naming collisions with similar resources that the consumer defines.

You can then specify this prefix, as shown below, so that Android Studio expects this prefix when you name project resources:

// This property is useful only when developing your project in Android Studio.
resourcePrefix 'mylib_'

SdkComponents sdkComponents

NamedDomainObjectContainer<out ApkSigningConfig> signingConfigs

Encapsulates signing configurations that you can apply to [ ] and [ ] configurations.

Android requires that all APKs be digitally signed with a certificate before they can be installed onto a device. When deploying a debug version of your project from Android Studio, the Android plugin automatically signs your APK with a generic debug certificate. However, to build an APK for release, you must sign the APK with a release key and keystore. You can do this by either using the Android Studio UI or manually configuring your build.gradle file.

NamedDomainObjectContainer<out AndroidSourceSet> sourceSets

Encapsulates source set configurations for all variants.

Note that the Android plugin uses its own implementation of source sets. For more information about the properties you can configure in this block, see AndroidSourceSet.

Splits splits

Specifies configurations for building multiple APKs or APK splits.

For more information about the properties you can configure in this block, see Splits.

TestCoverage testCoverage

Configure the gathering of code-coverage from tests.

To override the JaCoCo version that is used for offline instrumentation and coverage report, add the following to build.gradle file:

android {
    testCoverage {
        jacocoVersion "<jacoco-version>"
    }
}

For more information about the properties you can configure in this block, see TestCoverage.

TestOptions testOptions

Specifies options for how the Android plugin should run local and instrumented tests.

For more information about the properties you can configure in this block, see TestOptions.

String testBuildType

Specifies the build type that the plugin should use to test the module.

By default, the Android plugin uses the "debug" build type. This means that when you deploy your instrumented tests using gradlew connectedAndroidTest, it uses the code and resources from the module's "debug" build type to create the test APK. The plugin then deploys the "debug" version of both the module's APK and the test APK to a connected device, and runs your tests.

To change the test build type to something other than "debug", specify it as follows:

android {
    // Changes the test build type for instrumented tests to "stage".
    testBuildType "stage"
}

If your module configures product flavors the plugin creates a test APK and deploys tests for each build variant that uses the test build type. For example, consider if your module configures "debug" and "release" build types, and "free" and "paid" product flavors. By default, when you run your instrumented tests using gradlew connectedAndroidTest, the plugin performs executes the following tasks:

  • connectedFreeDebugAndroidTest: builds and deploys a freeDebug test APK and module APK, and runs instrumented tests for that variant.
  • connectedPaidDebugAndroidTest: builds and deploys a paidDebug test APK and module APK, and runs instrumented tests for that variant.

To learn more, read Create instrumented test for a build variant

Note: You can execute connected<BuildVariant>AndroidTest tasks only for build variants that use the test build type. So, by default, running connectedStageAndroidTest results in the following build error:

Task 'connectedStageAndroidTest' not found in root project

You can resolve this issue by changing the test build type to "stage".

TestFixtures testFixtures

Options to configure the test fixtures.

String? testNamespace

The namespace used by the android test and unit test components for the generated R and BuildConfig classes.

Public methods

publishing

abstract fun publishing(action: LibraryPublishing.() -> Unit): Unit

Customizes publishing build variant artifacts from library module to a Maven repository.

For more information about the properties you can configure in this block, see LibraryPublishing

Properties

aidlPackagedList

abstract val aidlPackagedList: MutableCollection<String>?

Aidl files to package in the aar.

prefab

abstract val prefab: NamedDomainObjectContainer<PrefabPackagingOptions>

container of Prefab options

publishing

abstract val publishing: LibraryPublishing

Customizes publishing build variant artifacts from library module to a Maven repository.

For more information about the properties you can configure in this block, see LibraryPublishing