Switch from the main.xml layout to another layout

Question

I have a basic Android question here:

I have a main.xml layout that loads up when the app is launched. This page has a menu button that I'd like to (when clicked) send the user to another layout (about.xml).

I doubt this is the right. When clicked this command is kicked in:

setContentView(R.layout.about);

And it seems to work, I do see the about.xml page, but I cannot navigate back to the main.xml layout when I hit the BACK button on my Android device, the app just closes.

I doubt that this is the right way to navigate between xml layout files. Can you please help or point me to a page that spells this out for a computer programmer beginner like myself?

Thank you very much,

Pat

EDIT: Thanks for all the answers you helped point me in the right direction. In an effort to help future noob programmers like myself to understand Activities, here's a great simple tutorial that I found online that mapped it out for us beginners!

http://www.warriorpoint.com/blog/2009/05/24/android-how-to-switch-between-activities/

Answer 1

Do you have a separate activity for your about page? Generally for each screen you create a new activity. When you go to new screen , the new activity will be stacked over the first screen activity. When you click Back on android device, the previous activity will be popped up.