how to handle device back button on sencha touch application

Question

In Sencha touch if I use navigation view i can get back button. This is pretty fine.

But what if user hit device backbutton? it is direct exiting the applicaiton.

Answer 1

You can handle hardware back button like this:

if (Ext.os.is('Android')) {
    document.addEventListener("backbutton", Ext.bind(onBackKeyDown, this), false);

    function onBackKeyDown(eve) {

        eve.preventDefault();

        //do something
        alert('back button pressed');

    }
}