[Interest] Qt interfacing to Android native UI ?

[Federico Buti]

On 3 November 2015 at 23:47, Edward Sutton <edward.sutton at subsite.com>
wrote:

> On Nov 3, 2015, at 4:24 PM, Federico Buti <fed.buti at gmail.com> wrote:
>
>
>
>
> On 3 November 2015 at 22:30, Edward Sutton <edward.sutton at subsite.com>
> wrote:
>
>>
>> > On Nov 3, 2015, at 2:11 PM, Jason H <jhihn at gmx.com> wrote:
>> >
>> >
>> >
>> >> Sent: Tuesday, November 03, 2015 at 10:12 AM
>> >> From: "Edward Sutton" <edward.sutton at subsite.com>
>> >> To: "Qt Interest" <interest at qt-project.org>
>> >> Subject: [Interest] Qt interfacing to Android native UI ?
>> >>
>> >> I know I can use native iOS UI by mixing Objective-C++ and C++ in the
>> same *.mm file.
>> >>
>> >> I have done a little Android JNI.  Are there any examples for
>> interfacing to Android native UI elements?
>> >>
>> >> I need to create a UI picker for manually entering GPS latitude and
>> longitude in degrees,  or degrees, minutes, seconds for a widgets app.  I
>> expect it will be hard to make a touch usable widget UI picker.  Developing
>> a native interface may take similar amount of time but result will be much
>> superior.
>> >
>> >
>> > >Define "much superior”?
>>
>> What the user expects. True native touch UI. Responsive and fast.
>>
>> >
>> > >Don't forget QML, which I think is the bee's knees. And then you have
>> one codebase for iOS and Android and Desktop, which to me is vastly
>> superior.
>>
>> Does QML have a numeric picker wheel ui element?
>>
>
> >​Since Qt 5.5 Tumbler
> <http://doc.qt.io/qt-5/qml-qtquick-extras-tumbler.html> is free.
>
>
> I just built and ran the Qt Quick Enterprise Controls and I saw tumbler.
> I am glad it is free for others to use too.
>
> The PieMenu looked great too.
>
>
>  >Anyhow writing one in QML is quite easy using a PathView. Here is a
> component
>
>
> That was one of my concerns about QML.  Initially it looks like you could
> only use what Qt had created for you,  If something like a tumbler did not
> exist I assumed you were out-of-luck.  I need to research PathView and what
> it takes to create a new custom control.
>

​There are many open source projects out there with free components (look
at Papyr material library <https://github.com/papyros/qml-material>. For
what concerns PathView you can have a look to this
<http://pastebin.com/embed_js.php?i=YnzFubvA> example of mine. Sure the
code is not the most beautiful but at least is a working example of a date
picker.



>
>> I have wanted to try creating UI elements in QML then display them in a
>> widget from my C++ Qt widget app.  I do not know if this is possible;
>> launching a QML ui then and receiving what the user selects from the QML
>> UI. It may be worth the effort.
>
>
>
>> If I could mix some QML with my widget app it could be a better solution
>> compared to writing (and maintaining) two (2) native UI numeric pickers,
>> one for Android, and one for iOS.
>
>
>> So far I have one Qt widget codebase supporting Android, iOS, Linux, OS
>> X, and Windows desktops except for a few things like Bluetooth, sending
>> email, UIAlertView ( QMessageBox looks terrible on iOS ) and such.  If I
>> start adding native UI interfaces for Android and iOS I start to lose
>> benefits of Qt.
>>
>
> >Mixing Qt Widget and QML is possible.​ Look at this blogpost
> <http://www.ics.com/blog/combining-qt-widgets-and-qml-qwidgetcreatewindowcontainer>
> .
>
>
> I just ran across that example.  It worked once I put the QML file into a
> resource.  However that example does not interact with C++.  I was hoping
> to find an example that would demonstrate how I could read the QML state
> from C++ ( or visa versa ).
>
> I assume ta QML toggle button could raise a toggled signal that a C++
> handler could react to?
>
> Or C++ could change the state of the QML toggle button?
>

​Well, C++ to QML interaction is possible as well as the other way around.
There are many resources ​available online. I have NO experience with
Widget-mixed code so I can tell for that in detail. Anyhow, you should
start from the resources provided by Sze Howe Koh and also have a look to
the usage of "objectName" discussed here
<http://doc.qt.io/qt-5/qtqml-cppintegration-interactqmlfromcpp.html#accessing-members-of-a-qml-object-type-from-c>
(and
to that page in general).



> Thanks Federico!
>
> -Ed
>

​You're welcome. :)
F.​



> ​Cheers,
> F.
> ​
>
>>
>> -Ed
>>
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