Thank you for contacting us about the issue. It seems that the behavior is present in Cordova for Android 3.6.4 and earlier versions
. I tested with Cordova 3.8 (Android 3.7.2)
in AppBuilder and the issue was not present. I was able to adjust the ringtone volume instead of the media one again. This said, please change the Cordova version of your project to Cordova 3.8
from the Properties
page and re-deploy your project as an application package again. Running it on actual device should result in the corrected behavior.
I hope this helps.