If your build fails because the Google Maps dependency is missing then download the Google APIs for Android 4.1 using the Android SDK Manager and run:
mvn install:install-file -DgroupId=com.google.android.maps \ -DartifactId=maps \ -Dversion=16_r3 \ -Dpackaging=jar \ -Dfile="$ANDROID_HOME/add-ons/addon-google_apis-google-16/libs/maps.jar"