Most definitely yes. Web apps keep getting more complex, longer and require more cognitive load than ever before. It's quite common to use the  OK  Cancel both at the top and at the bottom of the page. It's redundant, alright, but it makes it easier for the user. An even better solution your suggesting is the floating buttons. They are accessible at the same place everywhere on the page. I'd love to see Microsoft implement this floating call to action button in their next SharePoint release!

One got to be careful implementing it and not hide too much of the content. It's inevitable to hide some while floating, or at least make the content area smaller, especially on smaller screens. But done right - this can set a new convention on the UX scene.

Should a call to action float in a long page?
cancel(getIntent().getExtras().getInt(“notificationID”));

why we use of dot operator in between these methods? as cancel(int) method takes only one integer parameter.it has 3 methods as parametr.....what exactly the code will do..?
