Type in : cordova build android
If you did everything as supposed, you should see your apk files inside the folder:
You'll get two versions : one for armv7 processors and the other for intel x86 processors
Now the good news is, that whenever you want to build an apk from now on, you'll just have to paste your project inside the folder /www and run the cmd : cordova build android.
That's it folks! No more phonegap or XDK nuisance !