I want to generate a QR code of a simple text with zxing library but I could not find any library or API for that.
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use Zxing api for bar scanner and generator
here is a useful link also zxing
Barcode Scanner this app is based on Zxing api. You can use all functionality.

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Anand Tiwari
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this is for scan n i want for generation and do you know from where to get core.java for zxing? – sumit acharya Nov 08 '12 at 10:54
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I m using it for both generating and also for scanning, it also support linear and pdf codes. – Anand Tiwari Nov 08 '12 at 10:57
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from where you got core.java please give me link – sumit acharya Nov 08 '12 at 10:59
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[core](http://code.google.com/p/zxing/downloads/detail?name=ZXing-2.0.zip&can=2&q=) download it and go for "zxing-2.0\core", there is also new update, updated in october but I use before. – Anand Tiwari Nov 08 '12 at 11:03
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will you please show me wt code you used for code generation?i uesd intentintegrator.java and intentresult.java but having error. – sumit acharya Nov 08 '12 at 11:07
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Using of these is a simple way to invoke barcode scanning and receive the result, without any need to integrate, modify library code. carefully read them you will got them. – Anand Tiwari Nov 08 '12 at 11:21
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The IntentIntegrator
method relies on having the Barcode Scanner app installed.
If you don't want to install a third party application you can use the ZXing library and make your app a standalone app. Just follow this step-by-step guide.