It's a jungle how to grasp it?
Android SDK
https://developer.android.com/studio/index.html#command-tools
android list sdk --all
android update sdk -u -a -t <package no.>
npm install android-versions --save
Phone Gap
https://phonegap.com/products/
http://dasunhegoda.com/installrun-phonegap-ubuntu/797/
Drupal GAP
https://www.drupal.org/project/drupalgap
https://events.drupal.org/losangeles2015/sessions/develop-native-app-io…
Drupal documentation: https://www.drupal.org/docs/7/mobile/native-mobile-apps