Qt 5.10.1 try to compile a basic app for Android arm using cmake

Soda31

Hello everybody !

Well I'm near to begin crazy :

I try to compile a hello world app using Qt 5.10.1, cmake for Android

I installed all necessary things (sdk, ndk, ...) and I have no problem to compile and install a basic project using pro file on my smartphone

With my CMakeLists.txt I'm not able to generate files to compile
I have strange errors and when I think to solve them other bad things appear
The same project compiles and runs fine using msvc !

Well someone knows where I could download a working sample of a qt app using cmake for Android or have explanations to special things to do ?

Here is the content of my cmakelist file

cmake_minimum_required(VERSION 2.8.11)

project(testproject)

#Find includes in corresponding build directories
set(CMAKE_INCLUDE_CURRENT_DIR ON)
#Instruct CMake to run moc automatically when needed.
set(CMAKE_AUTOMOC ON)

#Find the QtWidgets library
find_package(Qt5Widgets)

set(SOURCES
src/main.cpp
src/mainwindow.cpp
)

set(FORMS
forms/mainwindow.ui
)
qt5_wrap_ui(FORM_H ${FORMS})

#Tell CMake to create the helloworld executable
add_executable(helloworld ${SOURCES} ${FORM_H})

#Use the Widgets module from Qt 5.
target_link_libraries(helloworld Qt5::Widgets)

I tryed to add following things

set(CMAKE_TOOLCHAIN_FILE "xxxxxxxxxxx/AppData/Local/Android/Sdk/ndk-bundle/build/cmake/android.toolchain.cmake")
set(CMAKE_PREFIX_PATH "C:/Qt/opensource/5.10.x/5.10.1/5.10.1/android_armv7/bin")

set(Qt5Widgets_DIR "C:/Qt/opensource/5.10.x/5.10.1/5.10.1/android_armv7/lib/cmake/Qt5Widgets")
set(Qt5Gui_DIR "C:/Qt/opensource/5.10.x/5.10.1/5.10.1/android_armv7/lib/cmake/Qt5Gui")
set(Qt5Core_DIR "C:/Qt/opensource/5.10.x/5.10.1/5.10.1/android_armv7/lib/cmake/Qt5Core")

Thanks !

Soda31

Well after some long hours I abandoned Qt Creator and I used Android Studio to use cmake and generate apk

Build is now fine but I have a new question:

My Qt app has a main and I understand that to launch my app with Android I need to generate a lib

I do not find enough informations to convert or adapt my initial app

#include "mainwindow.h"
#include <QApplication>
#include <QDebug>

int main(int argc, char *argv[])
{
QApplication a(argc, argv);

qDebug() << "TEST";

MainWindow w;
w.show();

return a.exec();

}

With pro files from Qr Creator compiling to Android is really easy (nothing to do in source code)

Well suggestions or ideas of what I should work to migrate my app to be usable with Android studio and cmake ?

Thanks !

SGaist

Hi,

I haven't done any test with it but it looks like this Qt-Android-CMake project might be what you are looking for.

Hope it helps

Soda31

Hello SGaist,

Thanks for your suggestion
I'll try it this week

I'm also going to try to create a Qt lib and call a function from java code like it is showed in some example

But I don't know if it will work using QMainWindow !

Soda31

Hello SGaist,

Well I tryed to use Qt-Android-CMake project to generate apk with qt libs using cmake

There are things that did not worked quickly (for example I used ndk toolchain instead included toolchain)

But after few hours of debug and tests I was able to genetate my first apk and installed it successfully on my smartphone !

QtCreator and pro files are fine to generate apk too but finally lots of things are hidden and hard to solve when a problem occurs (I'm not able to generate apk with QtCreator and cmake)

So, I'm really happy now !

Thanks for the tip

SGaist

You're welcome !

Since you have it working now, please mark the thread as solved using the "Topic Tools" button so that other forum users may know a solution has been found :)

alvarobasi

@Soda31 Hi! I'm following "Qt-Android-Cmake"steps copying your CMakeFile.txt for my basic QtCreator Android project. However, when compiling I get an error like this: "Android platform 'android-14' does not exist in SDK". How can I change the target platform?

Regards,