[Interest] Qt interfacing to Android native UI ?

[Edward Sutton]

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://github.com/benlau/quickandroid/blob/DEV/QuickAndroid/ImagePicker.qml

System Dispatcher - Invoke Java/Android function and vice visa without using JNI. Data type conversion is handled automatically.

https://github.com/benlau/quickandroid/blob/DEV/qasystemdispatcher.h

-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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