title: Application which uses camera to focus on QR Code
body: <p>I need to create an android application which pretty much works like a qr code decoder.</p>
  
  <p>I want to use the android phone camera and read only the qr code from the camera preview, and send it to a decoder library probably zxing which gives me the result. I don't want to use the zxing intent which uses another application barcode scanner.</p>
  
  <p>I am able to take a picture using phone camera, but I don't know how to read only the qr code part from the preview. I need help in this regard and also how to send the data to decoding library.</p>