Thou shalt programme
Following slides contain valuable information on Qt, Android and JNI that were presented during Qt Developer Days 2014. How to call a Java function using C++ (Qt) and how to call-back a C++ (Qt) function using Java are described here. Extending your Qt Android application using JNI They’re originally taken from http://www.qtdeveloperdays.com
If you’ve read my previous articles (especially this one) about how to use OpenCV in Unity and how to pass images between them, this post will feel like a breeze and you can just quickly skim through it. However, if you haven’t, I recommend doing so because in this post I’ll describe how to create …
In this post I’m sharing the pre-built libraries and binaries for OpenCV that I use to build Qt/QML and OpenCV powered apps for Android (armeabi-v7a) phones. An example of such application is Quick-Camera-CV which I shared its source codes in a previous post.
If you’re a regular Qt user (like me) and have tried writing Android applications with Qt then you must have come across situations where you’ve needed some very simple capabilities of Android API but it wasn’t present in the Qt library. Displaying a Toast message in Qt for Android is one of those situations. In …
Continue reading “How to Show a Toast Message in Qt for Android”
In this article I am going to describe the required steps needed for accessing Android Camera (or Default Camera Interface) using Qt. Unfortunately OpenCV does not provide a reliable way of connecting to Camera in Android so you have go for a method like this if you intend to write an Android application which uses OpenCV …
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This article describes how to open default Android Gallery in Qt using a mixture of Android’ Java and Qt (C++) code. It is specially useful if you are working with images, for example if you want to open a Mat Image in OpenCV using imread function or if you are just writing some kind of image viewer …
Qt allows you to use Java code in your Android applications. This is the same code that Android Studio (or Eclipse etc.) users use when they are writing applications for Android. In Qt, by default, you are limited to C++ code and what the Qt modules have to offer (which in most cases are enough) but there …
Continue reading “How To Mix C++ And Java Code (In Qt For Android)”
Another note to myself which I hope will be useful for others searching it. Add the following lines to your PRO file in Qt, or create a PRI file using the following and include that in your PRO file.