How to put a permanent notification on phone?

Hi guys, I’m developing an application with Unity3D and I need some help.

1 . I want to make a notification just like this.
2 . But i don’t want it close even if I tap “clear”.
3 . And also even if I close the app .

Use SetOngoing method.

Make sure you clear it from your code later once you are done as, it can’t be cleared by user.