You could configure which apps are allowed to create notifications in the top left area, the notification area. If an app creates a notification it will be collected and added to the list.
You could deny *all* notifications of an app or only *specific* messages - if it's not a customized notification. So I used it to hide "waiting for connection", but not "you are connected".
With a donation you s this app and get more options.

IMPORTANT
Your device has to be rooted to install the required X-posed framework: http://tinyurl.com/cd46qco


Donator-App & Features: https://play.google.com/store/apps/details?id=de.defim.apk.notifyclean.donator

// Option A // 5e7015

To NotifyClean mod from happymod.completedownload.net.
You need enable the option "Unknown Sources".
1. Click on the above link to NotifyClean mod APK.
2. Save the file in your device s folder.
3. Now tap on Install and wait for the installation to finish.
4. Once it is done, open the game and start playing it right away.

// Option B // 5s5x38

To NotifyClean from HappyMod APP, you can follow this:
1. Open your browser and the HappyMod APK file from happymod.completedownload.net - the only official website of HappyMod.
2. Open Android Settings and go into Privacy or Security.
3. Tap the option to Allow Unknown Sources and enable it.
4. Go to your Android s and tap the APK file.
5. Follow the directions on the screen to install it.
6. Search NotifyClean in HappyMod App.