background-Mode not work

I making mp3 player with ionic. I use “cordova.plugins.backgroundMode.enable()” for play music in background if close the app.
But when press hardware back button on Android is “stopping and closing” the app instead of just “closing and go back”.
I tried to control with “$ionicPlatform.registerBackButtonAction” but not work.
how can i do ? :frowning:

dont press back button. just press home button.