How can I change color background button and remove activityMain?

I want to create a page that in top of page load and shows html file when user press button and bottom of page is for 5 buttons and these buttons should stand together. (Like under picture)
I have some icons but background icons is white and background button in the program is black, now what should i do? Is there any way that i can change color background of icons?? do i search and found the other pictures?

I write the program in eclipse and run in galaxy nexus with android version 4.1. When i run the program, above of page shows activity main and settings menu. I want remove these but i don't know how can i do this?

Thank you for help. Cheers.