How to override zoom buttons of camera in an android app?
<p>I'm having <code>zxing app for barcode scanning</code>. It's having auto-focus but i need to set zoom in/out in my app.</p>

<p>It will be better if <code>i can override volume control buttons in android device for zooming in the app.</code></p>

<p>How can i implement zooming in my app using volume control buttons?</p>

<p>Please share your thoughts..</p>
