How to view the source code of an HTML page on an Android phone

There is a free app called “View Web Source” on Google play (formerly Marketplace).
Install it. Then visit a page and then use the Share function from the menu. You will have the option to “View Web Source” by James O’Brien.

Here’s the link:
https://play.google.com/store/apps/details?id=com.jamesob.vwsource&hl=en