build.gradle

apply plugin: 'com.android.library'

android {
    compileSdkVersion 28
    buildToolsVersion '28.0.0'

    defaultConfig {
        // Most backup classes (e.g. SharedPreferencesBackupHelper) were added
        // in Froyo.
        minSdkVersion 8
        targetSdkVersion 28
    }

    publishNonDefault true

    buildTypes {
        shadow
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            java.excludes = ['com/google/android/libraries/backup/shadow/**']
        }

        shadow {
            java.srcDirs = ['src']
            java.includes = ['com/google/android/libraries/backup/shadow/**']
        }
    }
}

dependencies {
    compile 'com.android.support:support-annotations:25.+'
    shadowCompile 'junit:junit:4.+'
    shadowCompile 'org.robolectric:robolectric:3.1-rc1'
    shadowCompile 'org.robolectric:shadows-core:3.1-rc1'
}