use device defaults for notification features

[grendell]

This includes sound, lights, and vibration settings.

Without this, Notification.defaults defaults to 0 while Notification.DEFAULT_ALL == -1, which will result in no vibration or sound for any notification, even when the user has set these to happen.

More info here.

[grendell]

Seriously though, please let me know if there's anything I can do to help get this merged. Thanks.

[yinfeiru]

@grendell Thanks for the PR! Although what you suggested makes perfect sense, I'd like to add a flag in MPConfig (eg. https://github.com/mixpanel/mixpanel-android/blob/master/src/main/java/com/mixpanel/android/mpmetrics/MPConfig.java#L176) so that people will be able to turn this feature on/off. A lot of existing users have AutoShowMixpanelUpdates on and notifications will be shown when the app is resumed. In that case, since the app is in foreground already, there's no need to alert the user.

[grendell]

@yinfeiru thanks for the feedback. I have updated the pull request accordingly.

[NickMele]

Is there a plan/timeline to get this PR merged?

[patedit]

Hi guys, I've modified the PR since it had some conflicts and merge it to master. Thanks for your contribution!