On June 6^th, more than 500 developers across China attended the long-awaited Qt China Developer Day 2013 in Beijing. It’s extremely exciting to see how familiar Qt developers are with BlackBerry 10 platform. As soon as registration started, the BlackBerry booth was flooded with developers!

Mike Zhou from our Developer Relations team presented on overview of the recent developments in Qt on BlackBerry 10 and discussed future plans. Coming all the way from Europe, our very own Qt Expert Vladimir Minenko also joined Mike on stage to co-present the technical session on “Developing with Qt for BlackBerry 10”.  The room was packed to the brim with eager developers wanting to learn how to build a BlackBerry 10 Cascades app using Qt.

Vlad and Mike showcased really cool Qt apps on BlackBerry 10 smartphones developed with Qt 5.0. Not only that, they showed the developers how easy it was by porting apps live on stage! Think converting from Qt to a BlackBerry 10 native app would be hard? Not at all when you joined the onsite coding demo session on how to easily convert their existing Qt app to Cascades based applications.  Developers were very excited about BlackBerry 10 supporting the Qt framework and how easy the porting process is.

When Mike and Vlad announced “Bring your Qt app source code to BlackBerry booth to win a BlackBerry smartphone” challenge, the developers went wild! So they came forward, and so easily, they ported into BlackBerry 10.

Jonah Lin, BlackBerry Elite from China joined BlackBerry experts on stage to showcase 2 of his apps developed on Qt, and also shared his experience on commercialization and internalization.

Qt developers often ask the following questions: Is there a porting guide to help me port my Qt apps to BlackBerry 10? What about porting Qt Quick to BlackBerry 10? How do I configure Qt Creator for BlackBerry 10?

The good news has arrived: you now have a porting guide covering the most commonly-encountered use cases. This guide provides the necessary information to developers of native mobile apps who fall in one of the following categories:

• Developers who have Qt apps written in C/C++/ QML/JavaScript and intend to have their apps running on the BlackBerry 10 platform;
• Developers who want to write new Qt C++, QML and/or JavaScript code for the BlackBerry 10 platform;
• And finally, developers who want to take advantage of the Cascades UI framework and change their existing UI to the Cascades framework.

BlackBerry supports developers in all of the above described scenarios, and so this guide provides developers with best practices for each category. It also explains why a particular practice is considered the best one.

Please check the full Qt porting guide at:

http://developer.blackberry.com/native/documentation/bb10/porting_qt_apps.html

Related Posts:

YouTube: BlackBerry Jam Session (JAM12): Porting Qt Applications to BlackBerry 10
Porting Qt Applications to BlackBerry 10 is Easier than Ever!
Writing Qt apps for the BlackBerry 10 platform
YouTube: QtDD12 – How Qt Helped RIM Build BlackBerry 10
YouTube: QtDD12 – Developing with Qt for the BlackBerry 10

With all the excitement around BlackBerry 10 launch, one key request from our developer community is how to bring your existing BlackBerry Java applications to BlackBerry 10. As always, we at RIM developer relations constantly strive to break any barriers for developers.

Starting today, we will be publishing a series of blog posts specifically designed to help port your existing BlackBerry Java application to BlackBerry 10. As you may already be aware, BlackBerry Java is no longer supported on BlackBerry 10. Our goal here is to provide you all the info needed to quickly migrate your app functionality.

The BlackBerry 10 Native SDK enables you to develop applications in C/C++ and provides an open-source friendly environment for porting POSIX compliant code. It comes with the Cascades framework allowing you to build visually rich applications. The key focus of this development guide is specifically on BlackBerry 10 Cascades development. For more information on BlackBerry Native Development, please refer to http://developer.blackberry.com/native/

What is Cascades?

BlackBerry Cascades is built using the Qt framework, which allows Cascades to leverage the Qt object model, event model and threading model. BlackBerry Cascades enables you to develop your UI in C++, Qt Modeling Language (QML), or both. Qt Modeling Language (QML) is a declarative language that’s based on JavaScript and is included as part of Qt. You can use QML to describe the structure and behavior of a set of UI controls. BlackBerry Cascades uses a modified version of QML to let you create UIs for your apps.

One fundamental importance when looking to develop your BlackBerry Cascades application is deciding when to use QML or C++. You can use both of these languages in your application, but as a general rule of thumb you should use QML for your UI development and C++ for your business logic. Please refer to the below link more information on BlackBerry Cascades development and to download Native SDK and BlackBerry 10 Simulator. https://developer.blackberry.com/cascades/

API Feature Parity

One of the main challenges while migrating app functionality from BlackBerry Java to Cascades is finding the correct mapping of APIs. To simplify this process, below is an API Feature Parity table that covers the most common BlackBerry Java APIs and their corresponding equivalent API in Cascades.

As you can see from the above table image, most of the common Java APIs have a direct mapping in Cascades making it easy for you to port your existing BlackBerry Java application to BlackBerry 10.

Please stay tuned for series Part 2 – Application Life Cycle.

Update – Brian Scheirer pointed out that there have been some awesome community samples too! -Ed.

For me, 2012 has definitely been a year of helping developers learn about our native and Cascades development tools. If you’re like me, you’re probably spending the holiday nights doing some coding – so I’ve put together this list of “The Best of Native Development for 2012″.

Cascades Webcasts
Thousands of developers from across the globe joined us for four webcasts to learn beginner to advanced Cascades concepts.  We were able to interact with developers directly, answer questions, and get immediate feedback as samples and code were displayed.  The format proved so successful that we’ve hosted many more webcasts on topics such as the BBM social platform, augmented reality apps, and OpenGL integration.

The live web casts were recorded and are available for viewing here.

Porting Guides
If you have existing content for another platform, we are making it easy to bring that content to the BlackBerry 10 platform.  Being able to re-use code across platforms reduces development and maintenance costs.  Distributing your application to multiple platforms opens you up to whole new market segments and increases your potential user base.  There a number of informative porting guides available to help you build for BlackBerry 10.

• iOS to BlackBerry 10 - http://devblog.blackberry.com/2012/12/porting-ios-apps-to-blackberry-10/
• Android to BlackBerry 10 - http://devblog.blackberry.com/2012/11/porting-android-game-to-blackberry-10/
• Qt to BlackBerry 10 - http://devblog.blackberry.com/2012/11/porting-qt-apps-to-blackberry-10/

Samples
The best and easiest way to learn to program is to look at sample code.  For every feature that BlackBerry 10 offers there is a sample project showing you how to put it into action.  Whether it’s integrating with BBM, using the Invocation Framework, getting sensor information, or communicating via Bluetooth, we’ve got you covered.

There are samples built right into the Momentics development environment, on the Cascades and Native microsites, and hosted on our github repo.  And if you find a feature that we missed, or an API without a clear example then let us know on Twitter @BlackBerryDev or in our developer forums and we’ll add what you need to get started!

• Cascades Samples - https://github.com/blackberry/Cascades-Samples
• Native SDK Samples - https://github.com/blackberry/NDK-Samples
• Cascades Microsite - https://developer.blackberry.com/cascades/sampleapps/

Stump the BlackBerry Devs
In August we launched a challenge to the BlackBerry Developer community to come up with a UI that would be difficult to implement in the Cascades UI framework.  The Cascades tools development team would try to implement the submissions in a flexible manner that could handle multiple screen resolutions and form factors.  They implemented three of the challenges and presented the solutions during the Unconference Day at BlackBerry Jam Americas.  We were able to show that Cascades is robust framework that is able to create stunning interfaces even when faced with challenging design requirements.  All the solutions are hosted on ourgithub repo.

If you have any Cascades or native dev questions – check out our forums and connect with me on Twitter.

Qt is an important part of our BlackBerry 10 Cascades framework. We were proud to be part of Qt Developer Days in Santa Clara, where we had our own booth set up to showcase the BlackBerry 10 OS and to speak to developers about the excitement surrounding the upcoming BlackBerry 10 launch event on January 30th (not long to go now!). Some developers did not really know what BlackBerry 10 was but after seeing the platform for themselves, they shared our excitement. This was a user interface that they had not seen before, and something a lot of the MeeGo community liked with its simple but powerful gestures.

Alec Saunders, VP Developer Relations at RIM, had a keynote speech where he presented our BlackBerry 10 ecosystem story. He also spoke to RIM’s involvement with Qt and how developers can be rewarded for porting their Qt applications to BlackBerry 10. BlackBerry World is a going to be a level playing ground for your applications to actually have a chance of being discovered and not lost in the crowd like on other platforms.

We seeded eager developers with BlackBerry 10 Dev Alpha testing devices for them to port over their existing MeeGo / Symbian Qt applications, and also provided technical support. For Qt Mobile Application Developers, BlackBerry 10 offers the ability to get a return on your existing development investments. Depending on the complexity of your application, the port over to BlackBerry 10 can really be a painless experience.

We do realize that not everyone can get to these events, and so we have the BlackBerry Qt Porting Program, an online offer so that eligible developers can get their hands on BlackBerry 10 Dev Alpha testing devices. For complete details, see the Official Program Terms and Conditions.

What you need to do is:

• Become a BlackBerry World Vendor.
• Submit your porting plan to bring your Qt app to BlackBerry 10 for approval at https://developer.blackberry.com/offers/qt

We also have an offer of a one-time donation of $10,000 USD to the Qt Project Hosting Foundation if 50 eligible Qt apps are ported to BlackBerry 10 by the Qt Community and then posted and available for sale in BlackBerry World by January 30, 2013 (1)

Criteria:

• Be a BlackBerry World Vendor.
• Apps must be submitted to BlackBerry World by January 20, 2013 and be approved.
• 50 Qt apps must be up for sale in BlackBerry World by January 30, 2013.

It was fantastic being part of Qt Developer Days in Santa Clara, but this is really just the start for us and by no means the end. We are actively working with Digia and the Qt foundation to further strengthen Qt and our relationship with it and also with you.

Below are some links of how we can help you develop for us:

Qt Project Wiki:

• http://qt-project.org/wiki/blackberry

Qt Project Group:

• http://qt-project.org/groups/qt-blackberry-and-qnx

Open Jam Sessions for Qt developers to talk to RIM internal Qt experts about technical problems:

• Qt Live Time with BlackBerry Developer Relations
  • Wednesday, December 12, 2012 @ 10:00 – 12:00 ET
  • https://developer.blackberry.com/devzone/jamcommunity/supportjams/session_registration.html?id=307
• Qt Live Time with BlackBerry Developer Relations
  • Wednesday, December 19, 2012 @ 10:00 – 12:00 ET
  • https://developer.blackberry.com/devzone/jamcommunity/supportjams/session_registration.html?id=308

Porting Qt to BlackBerry 10:

• Porting Qt Applications to BlackBerry 10 is Easier than Ever!
• Writing Qt apps for the BlackBerry 10 platform

Built for BlackBerry and the 10k Developer Commitment:

• http://developer.blackberry.com/10k

1) To be eligible, fifty (50) Qt Apps (“Apps”) must be submitted to BBAW by the Qt Community by 11:59:59 PM Eastern Time (“ET”) on January 20, 2013. Apps will be accepted beginning at 8:00 AM ET on December 8, 2012. Allow a minimum of ten (10) days for BBAW approval. Approved apps must be posted on BBAW for sale on or before January 30, 2013. Apps are not eligible if they simply contain a web launcher or shortcut or a web browser (“Excluded App”). RIM will confirm if Qt Community is eligible for $10,000 USD donation to the Qt Project Hosting Foundation (“Donation”) by February 28, 2013. Allow 8-12 weeks for delivery of Donation. Void where prohibited or restricted by law.

As a follow up to our latest blog post on how to write Qt apps for BlackBerry 10 and the recent Qt Developer Days, we are hosting a webcast this Friday December 14^th at 9 am EST with Vladimir Minenko, Technical Manager, Qt, from RIM to give developers the opportunity to learn more about how Qt is used on BlackBerry 10 and how it can be used to develop apps on the platform.  Vlad will talk about getting started with the development tools and show a demo of a standard Qt Quick application running on BlackBerry 10.  He’ll also discuss what to expect while porting larger and more complex Qt applications and the differences between using pure Qt UI APIs versus Cascades to build your apps.  There will be an opportunity for a Q&A session at the end so bring your questions!  Finally, learn more about the Qt offers that we providing to our developers who are porting or developing new apps for BlackBerry 10.

Register for the webcast today!