title: How to increase scanning area size in zxing
body: <p>Hii everyone currently iam working on scanning qr code from my app and i have used  zxing library and it's working good and  my problem is in my galaxy s4 mobile the scanning area is very small <img src="https://i.stack.imgur.com/0pORX.jpg" alt="enter image description here"></p>
  
  <p>Please help me</p>
  
  <p>thanks in advance</p>