build.gradle

import org.gradle.tooling.GradleConnector
import org.gradle.tooling.ProjectConnection
import org.gradle.tooling.BuildLauncher
import org.gradle.tooling.events.ProgressListener
import org.gradle.tooling.events.ProgressEvent

project.ext {
    androidProjDir = "${rootDir}/android-proj"
}

task build << {
    ProjectConnection connection = GradleConnector.newConnector()
            .forProjectDirectory(new File(project.androidProjDir))
            .connect();

    try {
        BuildLauncher build = connection.newBuild();
        build.forTasks(":google-maps-view-lib:clean", ":google-maps-view-lib:build");
        build.addProgressListener(new ProgressListener() {
            @Override
            void statusChanged(ProgressEvent progressEvent) {
                logger.lifecycle("$progressEvent")
            }
        });
        build.run();
    } finally {
        connection.close();
    }
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.14.1'
}