Must have your Shield rooted
apps needed installed
-AppOps
-Settings Editor
-Snowball
-Heads Up Notifications
-terminal emulator
Install the 5 above apps.
Grant settings editor WRITE_SECURE_SETTINGS permission in terminal
-su
-pm Grant by4a.setedit22 android/.permission WRITE_SECURE_SETTINGS
Add Snowball and Heads Up listeners to active listeners
-go to secure table in Settings Editor
-choose "enabled_notification_listeners" and choose editor value
-replace all text with "com.snowball.app/.nsprocess.NotificationService:codes.simen.l50notifications/.NotificationListenerService"
Grant draw over apps permission to snowball and Heads Up in AppOps
-for each app change "this app can appear over top of other apps" to allow
Now open Heads up and snowball and run through the setups.