Robolectric manual download

robolectricDownloader.gradle

/**
 * Downloads all android-all dependencies and copies them to the mavenLocal() repository
 *
 * Once applied to your gradle project, can be executed with ./gradlew robolectricSdkDownload
 */

import java.nio.file.Files

// The general idea of this was borrowed from https://gist.github.com/xian/05c4f27da6d4156b9827842217c2cd5c
// I then modified it heavily to allow easier addition of new SDK versions

// List from: https://github.com/robolectric/robolectric/blob/master/robolectric/src/main/java/org/robolectric/internal/SdkConfig.java
// This list will need to be updated for new Android SDK versions that come out.
def robolectricAndroidSdkVersions = [
        [androidVersion: "4.4_r1", frameworkSdkBuildVersion: "r2"],
        [androidVersion: "5.0.2_r3", frameworkSdkBuildVersion: "r0"],
        [androidVersion: "5.1.1_r9", frameworkSdkBuildVersion: "r2"],
        [androidVersion: "6.0.1_r3", frameworkSdkBuildVersion: "r1"],
        [androidVersion: "7.0.0_r1", frameworkSdkBuildVersion: "r1"],
        [androidVersion: "7.1.0_r7", frameworkSdkBuildVersion: "r1"],
        [androidVersion: "8.0.0_r4", frameworkSdkBuildVersion: "r1"],
        [androidVersion: "8.1.0", frameworkSdkBuildVersion: "4611349"],
        [androidVersion: "9", frameworkSdkBuildVersion: "4913185-2"],

]

// Base, public task - will be displayed in ./gradlew robolectricDownloader:tasks
task robolectricSdkDownload {
    group = "Dependencies"
    description = "Downloads all robolectric SDK dependencies into mavenLocal, for use with offline robolectric"
}

// Generate the configuration and actual copy tasks.
robolectricAndroidSdkVersions.forEach { robolectricSdkVersion ->
    def version = "${robolectricSdkVersion['androidVersion']}-robolectric-${robolectricSdkVersion['frameworkSdkBuildVersion']}"

    // Creating a configuration with a dependency allows Gradle to manage the actual resolution of
    // the jar file
    def sdkConfig = configurations.create(version)
    dependencies.add(version, "org.robolectric:android-all:${version}")
    repositories.add(Repos.jcenter(this.repositories))

    def mavenLocalFile = new File(this.repositories.mavenLocal().url)
    def mavenRobolectric = new File(mavenLocalFile, "org/robolectric/android-all/${version}")
    // Copying all files downloaded for the created configuration into maven local.
    task "robolectricSdkDownload-${version}"(type: Copy) {
        from sdkConfig
        into mavenRobolectric

        doLast {
            ArtifactResolutionResult result = dependencies.createArtifactResolutionQuery()
                .forModule("org.robolectric", "android-all", version)
                .withArtifacts(MavenModule, MavenPomArtifact)
                .execute()

            for(component in result.resolvedComponents) {
                def componentId = component.id

                if(componentId instanceof ModuleComponentIdentifier) {
                    File pomFile = component.getArtifacts(MavenPomArtifact)[0].file
                    File dest = new File(mavenRobolectric, pomFile.name)
                    Files.copy(pomFile.toPath(), dest.toPath())
                }
            }
        }
    }
    robolectricSdkDownload.dependsOn "robolectricSdkDownload-${version}"
}

For anyone that may come to this problem again, it seems that Robolectric 4.5.1 to 4.6 transitioned from android-all artifacts to android-all-instrumented artifacts. These artifacts also have -i3 appended to their frameworkSdkBuildVersion