FBB - Capture Hardware Back Button Event

[foolish3737]

Is it possible to capture the Back Button Event when a user clicks the devices Back Button?

[Guest]

You can listen to the keyDown event on View and check if the back button was pressed.

[foolish3737]

Thanks SashaKeith,

I set that up but when I hit the back button it exits out of my app. Is there a way to intercept that action and prevent it from happening?

[Guest]

You can call preventDefault() on the event.

[foolish3737]

Hrmm, sounds simple enough but I guess I didn't get it right. Here is how I coded it:

private function onKeyUp(e:KeyboardEvent):void {      e.preventDefault();      if(e.keyCode == Keyboard.BACK){           if(currentState == "Music"){                toggleMusic();           }      } }

It still exits out of the app...

[Guest]

Try this code:

<?xml version="1.0" encoding="utf-8"?>
<s:View xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        keyDown="view1_keyDownHandler(event)">

    <fx:Script>
        <![CDATA[
            protected function view1_keyDownHandler(event:KeyboardEvent):void
            {
                event.preventDefault();
                if (event.keyCode == Keyboard.BACK)
                {
                    lblStatus.text = "Back button pressed";
                }
            }
        ]]>
    </fx:Script>
    <s:Label id="lblStatus" text="Back button not pressed" />

</s:View>