I am trying to Integrate ZXing QR Code into my android app without installing BarCode Scanner app, I have followed the steps as:
1) Firstly I have downloaded ZXing.z
I had the same Problem and after hours struggling with it I finally managed to solve it like this. as Rubiraj is pointing
*Right Click on your project > Properties > Android > (under tab library) Add the Zxing project *
Assuming you were able to correctly create Zxing project as a Library as it is explained here : http://damianflannery.wordpress.com/2011/06/13/integrate-zxing-barcode-scanner-into-your-android-app-natively-using-eclipse/