local.properties の生成の仕方 / How to generate local.properties

When using ant for Android app building, local.properties is necceary in Android app project dir.
This file is generated automatically when creating new project. But if you need updating, type the following command on commandline.

$ android update project --path .

Via
http://www.androidengineer.com/2010/06/using-ant-to-automate-building-android.html