Release 4.4.1
This release fixes an issue with push notification registration in Android Lollipop/API 21. Users building with targetApi="21" are encouraged to update to this library version.
Google APIs for cloud messaging have changed in Lollipop, and users who want to use push notifications on Lollipop devices and build their applications with targetApi 21 will need to include some version of Google Play Services to send notifications to those devices. To add Google Play Services to your build, add the following line to your gradle dependencies:
compile "com.google.android.gms:play-services:3.1+"
Any version of Google Play Services above 3.1 (including 6.1.1, current at this writing) should enable your application to receive push notifications from Mixpanel.