NetworkLocation
Geolocation using wlan and gsm cells. Data provided by Apple and opencellid.org.
Part of the μg Project.
Building 
NetworkLocation can be easily build using maven (assuming you correctly setup the android sdk):
mvn package
See maven-android-plugin for more info
License
Copyright 2013 μg Project Team
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.