This just adds a custom view sample.
The animation of the custom view is messed up. But this is fixed with the other pull request I sent.
As well it currently does not fill the width. I thought Crouton by default sets the LayoutParams width to MATCH_PARENT, but maybe not here. Will investigate and send another pull request when fixed.
Sample: Add a custom view sample
Thanks for the PR. I've cleaned it up a little and put it back on development.