Mobile and Embedded

Hi, Problem is solved by replacing usb cable and changing the usb port. Regards, Avtansh Sharma

Hi, to make Qt app creation for Android and iOS easier, V-Play Engine offers many Components especially made for mobile app development and comes with many open-source demos and project templates you can start your application with. These demo projects, for example, also come with a pre-set folder structure and AndroidManifest.xml and Project-Info.plist configurations with icons. Hope this helps! Best, GT

Hi pradeep, Thanku for your answer, its very helpful.

@raven-worx it's not an example. it's my project.

@m-abed qInstallMessageHandler() is use full for saving the logs to a file, if you don't want to save it to the file than you can use QT_LOGGING_RULES.

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

@Avtansh-Sharma You need header files and libs for OpenGL and/or OpenGL ES in your sysroot in order to use them.

@chaithubk whenever data relevant for drawing has changed call update() on the QQuickItem and a call to updatePaintNode() (-> painting) is scheduled. Like in is mentioned in the link to the docs i've posted.

@raven-worx normaly I dont. The Widget should repaint itself in the next cycle after the move command. I just added it to see how long the drawing of the widget takes, via QElapsedTimer.

problem is solved by using QgrpahicsView with Qimage. I draw text on QImage And Display it in QGraphicScene. Cpu usage decreased to 45 % . Thanks for ur replies.

@jweber Hi and welcome to devnet forum I am not sure if this is possible at all. It is quite a long time back when I used MSVC. However, I am having no good feelings when I read your post. I had started recently compiling for Android. Since a couple of years I am using Qt creator and MinGW compiler. The Android compiling process is GCC-based as MinGW is. That is taking some ambiguities out. Therefore my recommendation you may save time and conserve some hair, when you are going directly to Qt creator when starting Qt for Android. The error message you are presenting is probably because of the mix MSVC and GCC-make, which might errornously recognized as linux version. I might be wrong there, but this looks fishy. In case you decide to follow my advice, also go directly to Qt 5.9.0 (at least). There seem to be recent change also on the Android side, which was not really helpful in getting started. I had struggled quite a bit when trying to follow the different advices and tutorials. "gradle" seems to have replaced "ant" already on Android. At the end I had decided to go directly to newest Qt5.9.0 at that time instead of fiddling around with the previous stuff. That went much easier.

@danielheise said in Qt5.0 Graphics acceleration improvement: Generally speaking what visual performance improves might be gained by moving to Qt5.0+? I understand this is quite the loaded question on several fronts. I assume that you have widgets-based kiosk application where almost everything is done by Q(Graphics)WebView. In this case, moving to Qt 5.x may be very important for you because it allows you to use newer WebKit. If your application allows browsing untrusted content, e.g. arbitrary web sites, using older WebKit may be dangerous because of unfixed security vulnerabilities In addition to security matters, QtWebKit 5.212 is much more compatible with moder Web content than older versions Even if you have control over the content that you disaply in your "browser", using newer WebKit allows you to use modern Web technologies like ES6, new HTML and CSS features etc. Now about "hardware graphics acceleration". It's possible with both Qt 4 and Qt 5. In Qt 4, hardware accelerated graphics is possible with DirectFB or platform-specific QWS plugins. You also can use OpenGL, in this case you need to use QGraphicsWebView with QGLWidget viewport (in Qt 5 there is newer QOpenGLWidget).

Hi, Thanks for the reply. Now I have created my own popup in qml as PopUp.qml, now i want to give this as input in dialog in other qml file. Can you please help me.

If you have the same error, why don't you post in the same thread? What Qt version are you compiling? For which board? How did you configure Qt? What steps did you take to configure Qt Creator? The OP did not specify -extprefix nor -hostprefix for his config, which might contribute to the problem. However, I think he simply misconfigured Qt Creator (pointed cross compilation Kit to desktop Qt version, instead of the cross compiled one).

Hello, I Did the same using libVlc to display RTSP stream to show it on Android device. But I am not sure this works for IOS too.

I fixed the problem by updating to Qt 5.9.1

@pbljung said in BLE demos fail on Android: errorReceived these errors can happen see my comments on top of void MyBluetoothDeviceInfo::onControllerError(QLowEnergyController::Error error) in https://github.com/ekke/ekkesBTLEexample/blob/master/cpp/bt/mybluetoothdeviceinfo.cpp not only 133 (reported as unhandled error) also 34 and 8 can happen see also all the discussions at https://bugreports.qt.io/browse/QTBUG-31674 per ex from my comment on 133: while developing new example app for BT LE and Qt 5.8 using QtQuickControls2 for Android, iOS I also run into GATT ERROR 133 googled and found out that this bug iseems not to be a Qt Bug. some more infos here: https://github.com/NordicSemiconductor/Android-nRF-Toolbox/issues/9 https://android.googlesource.com/platform/external/bluetooth/bluedroid/+/android-5.1.1_r13/stack/include/gatt_api.h of course would be great if Qt could handle error 133 my workaround: if getting a QLowEnergyController::ConnectionError I try to reconnect up to 5 times with a delay of 1000ms In most cases 2nd or 3rd retry will connect without the error. BTW: find out more on my new BTLE Example APP: http://bit.ly/ekkeBTLEapp

@ekkescorner Very Cool. Super thank you for sharing \o/

Not sure if it works on Arduino but for standard operating systems there's: https://api.kde.org/frameworks/kidletime/html/index.html

Did you even try to look at Toradex website ? A quick search returns: Getting started with Qt Qt for Device Creation