title: How to use a PC webcam as the emulator's camera
body: <p>I'm developing a qr code reader application. How can I use my webcam as a camera to scan the qr code in the emulator ? </p>
  
  <p>my SDK version is 4.3. I checked it out in developer.android site and they said that you have to select webcam0 as a back camera. I tried but it didn't work, and shows "unfortunately your app has been stopped".</p>