Did you close the notification by mistake without noticing it? Did you want to see the cleared notifications again? There is a hidden feature in Android 4.3 and above that allows you to see all the notifications in past few hours. “Notification History” is the app that links you to this hidden feature. This app is a simple shortcut to the notification history in your phone, so you do not need to grant any permission to this app. There are no advertisements and rooted phone is NOT required.
You can also find out the app that pushes the spam messages into notification. The app currently has 4.2 star ratings and five thousand people downloaded it on their Android device. I find this app very useful, as sometimes I clear messages without properly noticing them. I can review them again using this application.