On screen notifications for Samsung s4 I have a Samsung Galaxy Gt 19505. I am currently running andriod 4.4.2
I was wondering if there's any way to get on screen notifications for messages etc whilst using other apps. 
I used to have an iPhone,  but switched to Samsung because of how customisable Android is. However, the onscreen notifications are something I'm greatly missing. 
I am aware of message previews in the lock screen, and have that enabled, but I would absolutely love to have in screen notifications whilst using other apps. I am willing to download other apps to be able to do this. 
Please please please help
Thank you
I really like "HeadsUp" from Google Play Store and I use it myself.