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This is an example project that is explained in these the blogpost Phonegap and Google maps and an example off how to share the www folder between platforms explained in Phonegap and multiple platforms.
After cloning this repository you must link the www folder to the assets folder (create assets if it doesn't exist) for the android project with one of these commands:
go to the assets folder in the terminal and type: ln -s ../../www/ www
And to do this on windows for the android project:
open a console and type: mklink /D c:\pathtoproject\Android\assets\www c:\pathtoproject\www