Before going to Build using Ant, you must setup "xsl/mobile/android/android.config" file.
Important
IMPORTANT : This means the platform number of Android target vertion which is given under
$ android list targets
Please refer for more details Android Documentaion.
Go to the directory where your Android project located. Then run following command from Terminal :
$ /path/to/my_new_cordova_project/cordova/debug
on windows
$ path\to\my_new_cordova_project\cordova\debug.bat
Note
NOTE: This will created an android app which is signed by debug 'keystore'. You can not distribute it for end-users. But can be use for debuging purpose.For more details about Expiry of the Debug Certificate, refer Signing in Debug Mode in Android Documentation and for any issue.