Visual issue with QRadioButton on Android – no selection dot shown

[thomasGl]

The clicked signal is being received correctly, but the QRadioButtons are not visually showing as selected the dot inside the button does not appear. This seems to be a rendering or focus issue, and it occurs especially on mobile devices, particularly on Android.

#include <QApplication>
#include <QWidget>
#include <QRadioButton>
#include <QVBoxLayout>
#include <QTimer>
#include <QDebug>

int main(int argc, char *argv[]) {
    QApplication app(argc, argv);
    QApplication::setStyle("Fusion");

    QWidget window;
    QVBoxLayout* layout = new QVBoxLayout;

    QRadioButton* radio1 = new QRadioButton("Option 1");
    QRadioButton* radio2 = new QRadioButton("Option 2");

    // Kein QButtonGroup - versuch es direkt ohne den ButtonGroup.
    layout->addWidget(radio1);
    layout->addWidget(radio2);
    window.setLayout(layout);

    // Optional: Debugging-Ausgabe, um zu überprüfen, ob der Button korrekt aktiviert wird.
    QObject::connect(radio1, &QRadioButton::clicked, []() {
        qDebug() << "Option 1 clicked!";
    });

    QObject::connect(radio2, &QRadioButton::clicked, []() {
        qDebug() << "Option 2 clicked!";
    });

    // Optional: einen Button nachträglich auswählen
    QTimer::singleShot(100, [=]() {
        radio1->setChecked(true);
        qDebug() << "Option 1 should be checked now!";
    });

    window.resize(300, 150);
    window.show();
    return app.exec();
}

Has anyone encountered this before? Any suggestions on how to fix or work around it?

[jsulm]

@thomasGl QtWidgets are not actively developed (more in maintenance mode), this is especially problematic for mobile platforms. You should consider switching to QML which is better suited for mobile platforms.

[thomasGl]

Is it possible to use Qt Quick together with a form-based editor, where you can drag and drop UI components visually similar to how it's done in Qt Widgets with .ui files? The Buttons work with qt Quick.

[jsulm]

@thomasGl You can do that with https://doc.qt.io/qtdesignstudio/