How to implement back button functionality of android in Sencha Touch using cordova? -

i have searched lot on topic. till not find proper solution. want implement button functionality of android in sencha touch using cordova.

i have 2 views

one.js

two.js

inside one.js have button. on clicking button go two.js using following code.

ext.viewport.setactiveitem(ext.create('appname.view.two'));   

now of cordova able detect button press writing following code in index.html

<script type="text/javascript" charset="utf-8">       document.addeventlistener("deviceready", ondeviceready, false);      function ondeviceready() {         alert("in device");         document.addeventlistener("backbutton", onbackkeydown, false);     }  function onbackkeydown() {         alert("hello");     }      </script> 

so piece of code should write inside onbackkeydown, when user presses buton when in two.js, should return one.js

any appreciated.

why don't use same function bring second page?

document.addeventlistener("deviceready", ondeviceready, false);  function ondeviceready() {     alert("in device");     document.addeventlistener("backbutton", onbackkeydown, false); }  function onbackkeydown() {     ext.viewport.setactiveitem(ext.create('appname.view.one')); }