Programatically setting screen orientation on Android

TheoSys

Hi,

I'm porting an app from QT5.15 to QT6.3. A central function of my application is the setting of the screen orientation. According to the settings in a configuration file, the application must lock to landscape or portrait mode (or their inverse counterparts. For details look at TPanel). With QT5 I did:

QScreen *screen = QGuiApplication::primaryScreen();
QOrientationReading::Orientation ori = QOrientationReading::Undefined;
Qt::ScreenOrientations mask = Qt::PrimaryOrientation;
QOrientationSensor qOri;
QOrientationReading *pORead = qOri.reading();

if (pORead)
{
    ori = pORead->orientation();

    switch(ori)
    {
        case QOrientationReading::LeftUp:   mask = Qt::InvertedLandscapeOrientation; break;
        case QOrientationReading::RightUp:  mask = Qt::LandscapeOrientation; break;
        case QOrientationReading::TopDown:  mask = Qt::InvertedPortraitOrientation; break;
        default:
            mask = Qt::PortraitOrientation;
    }
}

if (pmanager->getSettings()->isPortrait())  // portrait?
{
    if (mask == Qt::InvertedPortraitOrientation)
        screen->setOrientationUpdateMask(Qt::InvertedPortraitOrientation);
    else
        screen->setOrientationUpdateMask(Qt::PortraitOrientation);
}
else
{
    if (mask == Qt::InvertedLandscapeOrientation)
        screen->setOrientationUpdateMask(Qt::InvertedLandscapeOrientation);
    else
        screen->setOrientationUpdateMask(Qt::LandscapeOrientation);
}

But in QT6 the method setOrientationUpdateMask() does not exist any more and I was not able to find an alternative way to implement the same behavior.
Is there something similar in QT6.3 and if so how should it be implemented?

A.T.

TheoSys

Usually I don't comment my own postings, but because there seems to be no answer I thing I should post the solution I found. To make it short: There is no working solution with Qt 6.3.1. Instead this must be done with a small Java program. To see the full code look at Orientation.java.
This can be called with C++ like this.

void TPageManager::initOrientation()
{
    int rotate = getSettings()->getRotate();   // Is base equal to LANDSCAPE or PORTRAIT?
#ifdef QT5_ONLY
    QAndroidJniObject activity = QtAndroid::androidActivity();
    QAndroidJniObject::callStaticMethod<void>("org/qtproject/theosys/Orientation", "Init", "(Landroid/app/Activity;I)V", activity.object(), rotate);
#else
    QJniObject activity = QNativeInterface::QAndroidApplication::context();
    QJniObject::callStaticMethod<void>("org/qtproject/theosys/Orientation", "Init", "(Landroid/app/Activity;I)V", activity.object(), rotate);
#endif
    activity.callStaticMethod<void>("org/qtproject/theosys/Orientation", "InstallOrientationListener", "()V");
}

To receive a signal with each change of the orientation, define the following function.

JNIEXPORT void JNICALL Java_org_qtproject_theosys_Orientation_informTPanelOrientation(JNIEnv */*env*/, jclass /*clazz*/, jint orientation)
{
    /* Do something with the "orientation" */
}

A.T.

ekkescorner

@TheoSys BTW: this is how I'm setting a fix Orientation on Android to Landscape in Qt 5.15:

QAndroidJniObject activity = QtAndroid::androidActivity();
if(activity.isValid())
{
    activity.callMethod<void>("setRequestedOrientation", "(I)V", 0);
}

see also: https://falsinsoft.blogspot.com/2018/02/qml-change-android-screen-orientation.html

I know there must probably some adjustments for Qt 6... will do this later this year when porting my apps from 5 to 6