[Interest] Qt interfacing to Android native UI ?

[Edward Sutton]

On May 1, 2016, at 4:27 AM, Robert Iakobashvili <coroberti at gmail.com<mailto: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<mailto: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<mailto: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<mailto: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<mailto: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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