Problem with QMagnetometer et QAccelerometer under Qt 5.14.1 and Android

Francky033

Since the upgrade to Qt 5.14.1, my application doesn't seem to find the accelerometer and the magnetometer under Android anymore.

The following code :

        compass = new QMagnetometer(this);

	// start the sensor

	if (compass)
	{
		bool result = compass->start();

		qDebug() << "result compass->start : " << result;

		if (compass->isActive())
		{
			MessageLog("Magnetometer sensor activated");
		}
		else
		{
			MessageLog("Magnetometer sensor not available!");

			compass->stop();
		}
	}

	accel = new QAccelerometer(this);

	// start the sensor

	if (accel)
	{
		bool result = accel->start();

		qDebug() << "result accel->start : " << result;

		if (accel->isActive())
		{
			MessageLog("Accelerometer sensor activated");
		}
		else
		{
			MessageLog("Accelerometer sensor not available!");

			accel->stop();
		}
	}

gives result compass->start : false and result accel->start : false

Everything worked fine with Qt 5.13.2.

In the AndroidManifest.xml file, I added the lines :

<uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true" />
<uses-feature android:name="android.hardware.sensor.compass" android:required="true" />

the pro file contains :

CONFIG += mobility
         MOBILITY =
         QT += androidextras
         #CONFIG += console

# Android armeabi-v7a
     equals(ANDROID_ABIS, armeabi-v7a) {

             message("armeabi-v7a")
             QMAKE_CXXFLAGS_DEBUG += "-fsigned-char -g -O0"
             QMAKE_CFLAGS_DEBUG += "-fsigned-char -g -O0"
             QMAKE_LFLAGS_DEBUG += "-O0 -Wl,--allow-multiple-definition"

             QMAKE_CXXFLAGS_RELEASE += "-fsigned-char -O3 -fopenmp -DNDEBUG"
             QMAKE_CFLAGS_RELEASE += "-fsigned-char -O3 -fopenmp -DNDEBUG"
             QMAKE_LFLAGS_RELEASE += "-O1 -Wl,--allow-multiple-definition"

             LIBS += -fopenmp

             ANDROID_EXTRA_LIBS = \
                $$PWD/android/lib/armv7/1.1/libcrypto.so \
                $$PWD/android/lib/armv7/1.1/libssl.so

             ANDROID_PACKAGE_SOURCE_DIR = $$PWD/android

             DEFINES += \
                 QTAT_APK_INFO \
                 QTAT_APK_EXPANSION_FILES

             include(QtAndroidTools/QtAndroidTools.pri)

             #ANDROID_PERMISSIONS=

             INCLUDEPATH += QtAndroidTools
             INCLUDEPATH += ../librairies/quazip-0.8.1/quazip


             LIBS += "../librairies/freetype-2.10.1/android/armv7/libfreetype.a"
             LIBS += "../librairies/assimp-5.0.0/android/armv7/libassimp.a"
             LIBS += "../librairies/quazip-0.8.1/android/armv7/libquazip5.a"

             LIBS += "C:\Users\KarlHal\AppData\Local\Android\Sdk\ndk\20.1.5948944\sources\cxx-stl\llvm-libc++\libs\armeabi-v7a\libc++_static.a"
            
 }

There are no special warnings about QSensors. I have this strange warning, though:

Error reading file: C:/Qt/5.14.1/android/plugins/se_armeabi-v7a.sors/libplugins_se_armeabi-v7a.sors_qtse_armeabi-v7a.sors_android_armeabi-v7a.so: No such file or directory

What could go wrong?

Thanx!