How to port QT (in symbian) application to Blackberry?
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That really depends how platform specific your app is. E.g. I write plain QML apps (I love to create custom designs) and as result it was necessary to do only following things for me: create bar-descriptor.xml file (you can use one from the sample app), create splashscreens and icon of appropriate size and that's it. If you are using mobility you might need to do more, e.g. PlayBook does not have IMEI so you have to write custom code to get device Id (PIN, S/N or both).
Start with sample app, figure out differences and go.
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I would suggest keep your existing C++/JS backend code intact but use Cascades components for UI to get native look & feel on BB10. Also lot of good models are available in Cascades those can be used as well
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May this help , I havent investigated yet :
looking for the same in meego flavour ...
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If you're using Symbian Qt Components, this could help you:
http://kodira.de/2012/12/qt-components-on-blackberry-10/