How to Enable It-:
1) At First, Install Dashdow App in your Android Phone Download Now
2) After Install Above Application in your Phone, Let’s Open it, and you will see some Options in this app. Simply Select First Option, which is Notification Access.
3) After Click on Notification Access option, now it will redirect you to Settings, and Tick on Dashdow app icon, and Press Back Button of your Phone.
4) Now you are done !! no need to do any other Settings. Simply Enjoy your Phone, if any Whatsapp SMS comes, then this application will give you a Pop up, like Messenger
Enjoy...