[Interest] Qt interfacing to Android native UI ?

Mon May 2 20:50:36 CEST 2016

Dear Ekke,
Thank you for sharing your experience with
qt.labs.controls Qt Quick Controls2 in 5.7.

Sure, we'll be reading you blog.

Kind regards,
Robert

On Mon, May 2, 2016 at 8:38 PM, ekke <ekke at ekkes-corner.org> wrote:
> I really like the new qt.labs.controls from Qt 5.6 (will become Qt Quick
> Controls2 in 5.7)
> using these lightweight controls together with Material Style (Android) or
> Universal Style (Windows) with light or dark themes and all the new Controls
> (like Drawer) for mobile-app-navigation and also HighDPI Support you can now
> first time ever develop mobile apps with nearly native feeling. (iOS style
> will come later when the new controls are stable)
>
> I prefer to write UI in QML compared with React Native's mix of Markup and
> JS or using Xamarin where you have one language but different code for
> x-platform.
>
> Before leaving QT for mobile apps - give it a try.
> BTW: I'm writing a blog series about my experiences http://j.mp/qt-x  and
> I'll develop - as proof of concept - Conference APPs for QtCon and Qt World
> Summit.
>
> ekke
>
> Am 02.05.16 um 20:17 schrieb Robert Iakobashvili:
>
> Dear Edward,
> React Native - good catch.
>
> Thank you so much for sharing this idea
> and your experience!
>
> Kind regards,
> Robert
>
>
> On Mon, May 2, 2016 at 8:08 PM, Edward Sutton <edward.sutton at subsite.com>
> wrote:
>
> On May 1, 2016, at 4:27 AM, Robert Iakobashvili <coroberti at gmail.com> wrote:
>
> Dear Edward,
> What are your conclusions and which direction you decided on
> after your experiments?
>
>
> I never made much progress. While QML looked more "native like” I never felt
> comfortable using it.
>
> I am doing my new iOS and Android development using Facebook's react-native.
> React Native calls native UI from Javascript.
>
> https://facebook.github.io/react-native/
>
>
> When it makes sense I select UI components that have counterparts in Android
> and iOS in order to increase code re-use.   I have seem claims of 85% code
> re-use and from my experience  I do not doubt these claims.
>
> So far, so good...
>
> -Ed
>
>
>
> Thanks,
> Kind regards,
> Robert
>
>
> On Thu, Nov 5, 2015 at 2:40 PM, Edward Sutton <edward.sutton at subsite.com>
> wrote:
>
> Hi Robert,
>
> The approach you outlined below was the one I was considering. Use of common
> C++ business layer, widgets for desktops, iOS native UI, and Android native
> UI.
>
> The Android native UI was my biggest concern.
>
> I am going to continue experimenting with QML for a few more days
>
>
> Hi Ben,
>
> Thank you for sharing your Android UI interfacing code.  I will take a look.
>
> Your iOS UI interfacing code was *very* helpful in understanding how to mix
> C++ and Objective-C++ in the same *.mm file.  Java seems much more
> challenging to interface to native UI.  However all I have done so far is
> simple JNI calls into Java.
>
> Thank you both,
>
> -Ed
>
>
> On Nov 5, 2015, at 1:51 AM, Ben Lau <xbenlau at gmail.com> wrote:
>
>
> Not really a solution for wrapping Android UI in Qt app. But I have already
> developed an image picker with native UI and communication library between
> Qt and Java/Android. May be it could used as example / core framework.
>
> Image Picker
> https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_benlau_quickandroid_blob_DEV_QuickAndroid_ImagePicker.qml&d=CwIBaQ&c=G4BpsyPyB19LB50bn2swXw&r=cAG2c-SQES5P2qb8IW-uwnBOCX_f2qYJIlzenFnoHUc&m=nrrSNDcnq0DATI4qf2zrUTNMu_m6wsOws_Oz0VoTjAU&s=b9qfgeLoPCVjdDxzeFLLLuGl5EwnXG7Gv0sTjZwTjwU&e=
>
> System Dispatcher - Invoke Java/Android function and vice visa without using
> JNI. Data type conversion is handled automatically.
>
> https://urldefense.proofpoint.com/v2/url?u=https-3A__github.com_benlau_quickandroid_blob_DEV_qasystemdispatcher.h&d=CwIBaQ&c=G4BpsyPyB19LB50bn2swXw&r=cAG2c-SQES5P2qb8IW-uwnBOCX_f2qYJIlzenFnoHUc&m=nrrSNDcnq0DATI4qf2zrUTNMu_m6wsOws_Oz0VoTjAU&s=m04hl55EIBiEA7ELiqTGCj-dyEOx30iqkz2skvOT-rM&e=
>
>
>
> -Ed
>
>
> On Nov 5, 2015, at 1:36 AM, Robert Iakobashvili <coroberti at gmail.com> wrote:
>
> Dear Ed,
> It seems that I have something native for iOS, but not for Android.
>
> I was thinking now about another path to take:
>
> 1. Common layer - with business app logic;
>
> 2. Presentation layer with the below options:
>
> 2.1 Qt Desktop layer to cover Win, Mac and Linux;
> 2.2 iOS-Native;
> 2.3 Android-Native.
>
> Please, update us on your success of co-existence between
> Qt-Widgets and QML and whether after adding QML it is still
> sustains tough memory environment on iOS and low-memory
> Android devices.
>
> Thank you in advance.
>
> Regards,
> Robert
>
>
> On Tue, Nov 3, 2015 at 5:12 PM, Edward Sutton <edward.sutton at subsite.com>
> wrote:
>
> 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.
>
> Thank you for your advice,
>
> -Ed
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> --
>
> ekke (ekkehard gentz)
>
> independent software architect
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