android screen width always 360?

[pyhk]

hi all,

i am new to qml on android. i have created a sample app (using qt creator's "Qt Quick Application - Empty") , put the code below in main.cpp, and then run it on android devices,

QScreen* primaryscreen = QGuiApplication::primaryScreen();
QRect rect = primaryscreen->geometry();
qreal width = qMin(rect.width(), rect.height());
qreal height = qMax(rect.width(), rect.height());
qDebug() << "w: " << (width) << ", h: " << (height);

oneplus one (android 7.1.2), w: 360, h: 640
redmi 5 (android 7.1.2), w: 360, h: 660
Huawei P10 plus (android 7.1.2), w: 360, h: 660

it seems width is always 360 and height is around 600 something, although the native resolution of all 3 devices are very different. i googling around and can't find doc explaining this 360 figure.

is it a expected behavior?

thx in advance!

py

PS: qt 5.11.2 open source, running on ubuntu 16.04 LTS

[J.Hilk]

hi @pyhk said in android screen width always 360?:

try it with availableGeometry

[pyhk]

thanks for pointing out availableGeometry()

but the result is still the same. it seems QGuiApplication "masks" the underlying, real screen resolution, and QGuiApplication::primaryScreen() is always 360x600 something. at least it is what looks liked on android device.

(i have tried a windows 10 tablet, with 3840×2160 display. the availableGeometry() returns 1920x1080. QGuiApplication does have some magic in itself)

py

[pyhk]

oh, my mistake.

i haven't paid attention to the very 1st line of code in the main.cpp, which is:

QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

after changing it to AA_DisableHighDpiScaling, the geometry(), availableGeometry(), etc work as expected.

thanks

py