windows 7 - ionic build android doesn't do anything -

windows 7 - ionic build android doesn't do anything -

i trying set ionic in windows 7 machine. follow steps here http://ionicframework.com/docs/guide/installation.html.

when step, ionic add together platform android, nothing. ionic platform android tries download cordova-android not sure if fine. below console logs. can help me how solve issues.

c:\inv-mob\todo>ionic platform android npm http https://registry.npmjs.org/cordova-android/3.6.3 npm c:\inv-mob\todo>ionic build android

c:\inv-mob\todo>

reinstalling android sdk worked.

windows-7 ionic-framework