如何在另一个线程中创建Android通知？

I want to create a notification for my android app. I have it working fine when I run it with the rest of my code inside a class, everything executes when I click a button and the notification works fine. However, because there is a lot of work to be done, the application is running slowly when I click the button. To help this, I have separated the notification part into a class of it's own and I am running it on a different thread. I do not have a lot of experience with threads, or notifications for that matter and I would appreciate some help with this problem. Should I be separating the notification part into a class of it's own?I want to create a notification for my android