android show notification with a popup on top of any application

Question

With the below code my notification are only added to the notification bar, no popup style message is displayed like if you would receive a whatsapp message when you\'re in

Answer 1

Below API level 26: Set Notification.PRIORITY_HIGH or Notification.PRIORITY_MAX in the Builder when sending the message.

API level 26 or above:

Set channel priority high

Important: Once the channel has a established priority it cannot be changed. If it was in LOW will not show the popup, unless you reinstall the APP.