Mahammad Ashik AHi, my requirement is qr code reader in liferay portlet. how i can acheive this in liferay 7?
Start by solving the problem of building a QR code reader in a browser, leaving Liferay out of it.
When you get a solution to that problem, then you can approach how to implement your solution in Liferay.
You'll likely find that it is a difficult issue, one which requires access to the camera, file upload, image processing libraries, etc.
If you have the skills to pull that off, it will be quite easy to reimplement in Liferay.
