Add hook for Android/PhoneGap back button integration

[GoogleCodeExporter]

Feature request.

Tight integration with android back button will use iui history stack instead 
of the browsers history stack. (requires phone gap to the best of my knowledge) 

function androidBackButtonListener (){
   if (first page in history list)
      device.exitApp();
   else
      iui.goBack();
}

document.addEventListener("backbutton", androidBackButtonListener, false);

This can be implemented in various ways, either inside iui, or iui can expose 
some of the history functionality so users can implement it themselves (add a 
page to the tutorials/faq).

NOTICE:
When opening the page, iui will add the default selected page to the history, 
creating two history entries [#, #first-page]. This is why my current 
implementation does:

if (iui.getHistory().length <= 1)
   device.exitApp();
...
This includes both 0 and 1 history lengths.

Original issue reported on code.google.com by san0f...@gmail.com on 28 Sep 2011 at 1:55

[GoogleCodeExporter]

Notice the code sample above is what a developer would write to do the 
integration, not necessarily part of iui. All iui has to do to support it is to 
make the history accessible to external javascript code.

Original comment by san0f...@gmail.com on 4 Oct 2011 at 2:46

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[GoogleCodeExporter]

Original comment by msgilli...@gmail.com on 9 Jan 2012 at 6:59

• Changed title: Add hook for Android/PhoneGap back button integration
• Changed state: Accepted
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• Removed labels: ****