Need set zoom for camera preview…
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The ZXing app does zooming. Check around line 340
http://www.google.co.uk/codesearch/p?hl=en#z3Vnz2tRCuY/trunk/qrcode-scanner-live/android/src/com/google/zxing/client/android/CameraManager.java&android.hardware.camera%20lang:java&l=338