Mobile and Embedded

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  Unsolved Bluetooth Low Energy check if device is connectable
  • michaelL

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  @Pham-Hoang said in Bluetooth Low Energy check if device is connectable:

  serviceUuids

  @Pham-Hoang it advertise always the same services. But only the type flag is different. I have checked now and the application output gave me this hint:

  D BluetoothDevice: mAddress: 77:A5:12:38:FA:6F D BluetoothDevice: getBluetoothClass: classInt = 7936 D BluetoothDevice: getType: type = 2 D BluetoothDevice: getName: name = myPeripheralName

  So type = 2 it means connectable and type = 3 is non connectable. But how can I read this function "getType"? I don't see it on QBluetoothDeviceInfo class.

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  Solved Problem with QML Android VirtualKeyBoard
  • edoardo.videx

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  Great. Happy coding! :-)

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  Solved Is it possible to write a custom keyboard driver without using Qt's plugin system?
  • FrozenTarzan

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  @SGaist Ah, ok. Thanks! I mark this one as solved.

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  Solved To connect Android BroadcastReceiver onReceive() method with cpp
  • ashajg

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  @dheerendra

  Created MyActivity.java and called registerBroadcastReciever() in my main.cpp.

  import android.net.NetworkInfo.DetailedState; import android.net.wifi.WifiInfo; import android.net.wifi.WifiManager; import android.app.Activity; import android.content.Context; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.content.BroadcastReceiver; import android.util.Log; import org.qtproject.qt5.android.bindings.QtActivity; import android.net.ConnectivityManager; import android.content.IntentFilter; public class MyActivity extends QtActivity { public void registerBroadcastReceiver() { WifiReceiver wifires =new WifiReceiver(); System.out.println("ASHISH123"); IntentFilter intentFilter = new IntentFilter(); intentFilter.addAction(ConnectivityManager.CONNECTIVITY_ACTION); intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION); intentFilter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION); registerReceiver(wifires, intentFilter); } }

  Main.cpp:

  #include <QGuiApplication> #include <QQmlApplicationEngine> #include "wificlass.h" #include<QQmlContext> #include <QtAndroid> int main(int argc, char *argv[]) { QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling); QGuiApplication app(argc, argv); WIFICLASS w; QQmlApplicationEngine engine; QtAndroid::androidActivity().callMethod<void>("registerBroadcastReceiver"); engine.rootContext()->setContextProperty("Ash",&w); engine.load(QUrl(QStringLiteral("qrc:/main.qml"))); if (engine.rootObjects().isEmpty()) return -1; return app.exec(); }

  It solved my problem of registering BroadcastReceiver..

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  Unsolved Point Cloud Library: Sliced points to custom colors
  qt 5.7 vtk pcl • • sayan275

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  Solved Start android service at boot time
  • Montjet

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  @raven-worx said in Start android service at boot time:

  anyway. There must be more than 5 lines in the logcat ouput.
  How are you testing exactly?

  Command: "./adb -d logcat > log.txt".
  I included only logs containing "com.kdab.training".

  @raven-worx said in Start android service at boot time:

  What API version are you building against and also executing on?

  API level 27.
  Android 5.1 Lollipop.
  SDK Version: 26.1.1.
  NDK Version: 16.1.4479499.
  Qt: 5.11.2.

  #edit
  I changed API level to 22, but service still doesn't start.

  #edit2
  New warning:

  W/PackageManager( 2573): Failure retrieving resources for com.kdab.training: Resource ID #0x0

  #edit3
  Application is tested on phone with installed MIUI.
  For some reason application have not permission to autostart - startup manager, so RECEIVE_BOOT_COMPLETED permission still is not granted ;/

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  This topic is deleted!
  • LijoIgnatius

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  Solved How to implement this UI effect (just like the Listview of android)for Android in qt ？I tried some classes like QListWidget、QListView，but they seems more suitable for PC
  • dmnc

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  Hi @dmnc,

  Here is an basic example using QML:

  //file: main.qml import QtQuick 2.9 import QtQuick.Controls 2.2 import QtQuick.Controls.Material 2.2 import QtQuick.Layouts 1.3 ApplicationWindow { visible: true width: 480 height: 640 title: qsTr("Android ListView") //Taken from Toolbar documentation header: ToolBar { RowLayout { anchors.fill: parent ToolButton {text: qsTr("☰")} Label { text: "My Awesome List" elide: Label.ElideRight horizontalAlignment: Qt.AlignHCenter verticalAlignment: Qt.AlignVCenter Layout.fillWidth: true } ToolButton {text: qsTr("⋮")} } } //Dummy data model ListModel{ id: myModel ListElement{number: 123; ip: "1.2.3.4"; status: "Idle"} ListElement{number: 456; ip: "5.6.7.8"; status: "Idle"} ListElement{number: 789; ip: "9.10.11.12"; status: "Run"} ListElement{number: 101; ip: "13.14.15.16"; status: "Idle"} ListElement{number: 213; ip: "192.168.1.1"; status: "Run"} } //List view ListView{ id: list model: myModel anchors.fill: parent //Item delegate provides the "ripple" effect delegate: ItemDelegate{ width: parent.width //Some "hack" for alternating row colors as "Material.background: ..." doens't work //See https://stackoverflow.com/questions/44889261/changing-background-and-text-color-of-a-itemdelegate Component.onCompleted: background.color = (index % 2 == 0 ) ? Material.background : Qt.lighter(Material.background, 1.3) //Simple row displaying data from model Row{ anchors.verticalCenter: parent.verticalCenter anchors.left: parent.left anchors.leftMargin: 16 Label{width: 25; text: index} Label{width: 50; text: number} Label{width: 100; text: ip} Label{width: 40; text: status} } } } }

  Note that to enable the "Material" theme, you need to place the file qtquickcontrols2.conf in the QML resource file (qml.qrc by default), which should already contains main.qml. The "ripple" effect is provided by ItemDelegate.

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  Unsolved QML Imagine Style not working on iOS
  • Jan80

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  Unsolved Serial port reading with QSerialPort : No such slot QObject...
  • Quintinius

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  @Quintinius said in Serial port reading with QSerialPort : No such slot QObject...:

  "QObject::connect: No such slot QObject::readyReadSlot()"

  Error is saying that the class QObject has no method public slot called readyReadSlot

  I still don't know why you have this error, but please try to use the new Signal/Slot syntax

  connect(port, &QSerialPort::readyRead, this, &PortListener::readyReadSlot);
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  Unsolved Qt 5.10.1 EGLFS libinput Touchscreen rotation
  raspberry eglfs libinput touchscreen • • chtioub

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  Unsolved QT 5.11 TvOS Development
  • lcaldoncelli

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  Hi and welcome to devnet,

  That's a question better asked on the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.

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  This topic is deleted!
  • lukam

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  Unsolved Password authentication using two different qml files
  • JasmineSethi

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  First you should not have two different qml files for this task. Just create one QML file called LoginCheck.qml

  You create two objects of this LoginCheck.qml. Show one object at a time. Move from object to other object based on the user action. Set the properties of second object(SecondScreen) when moving from first object(first screen)

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  Unsolved How do I setup a kit to crosscompile for Raspbian for the Pi3?
  • graniteDev

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  @graniteDev

  arch command on my desktop:
  x86_64

  If you're following the suggested RaspberryPi2EGLFS guide, in step #10 please pay attention to

  If your system is 64 bit you may also edit device option to:

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  Unsolved Windows 10 Tablet QNetworkConfigurationManager not online if WIFI
  • ekkescorner

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  @J.Hilk thx - will try this

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  Unsolved Qt and HERE Map API
  • Exotic_Devel

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  Unsolved Error while cross compiling qtscxml module for raspberry pi
  • RG97

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  Did the suggestion work ? Are you able to solve the issue ? Do you need help.

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  Solved OpenSSL for Android support
  • Unix One

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  Hi,
  I had a lot of trouble with openssl and qt with android too.
  So I wrote a post how to solve the problems.
  Hope this helps.

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  Unsolved How to create a popup message dialog or alert message dialog after inserting a pedrive/ usbdrive/sdcard into system
  • Rahul Samanta

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  Hi,

  You might also be interested in KDE's Solid framework

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  Unsolved How to Crosscompile Qt 5.2.1 to Arm toolchain
  • RajkumarB

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  @RajkumarB

  I didn't face this issue, I've never used xcb, but did you copied cross compiled plugins/platforms dir to device?
  It contains libqxcb.so that app miss apparently.

  to set the path to platforms plugin use QT_QPA_PLATFORM_PLUGIN_PATH:

  QT_QPA_PLATFORM_PLUGIN_PATH=/opt/device/Qt-5.9.5/plugins/platforms

  Also there are such options that I use for eglfs
  QT_QPA_PLATFORM=eglfs
  QT_QPA_EGLFS_INTEGRATION=none
  Maybe xcb has something similar.

  Also to load a plugin on app startup use "plugin" opt:

  ./app -plugin tslib
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  Solved Native android code with QT
  • ashajg

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  Hi sir @sierdzio

  I got the solution :) by using this (Landroid/content/Context;)Ljava/lang/String; I got wifi name.

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  Solved How to move the cursor point from one Textfield to another Textfield?
  • JasmineSethi

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  @JasmineSethi said in How to move the cursor point from one Textfield to another Textfield?:

  16777219

  Its an enum value of Qt.Key_Backspace. you can replace number with "Qt.Key_Backspace"

  Can you change the focus to false once you leave the text field. Maybe because of it, it is showing the cursor.

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  Unsolved API Warning when launching on Android 9
  • ArnaudG

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  I'm getting the same problem with a pretty much empty android app that is built with qt creator. At least when running on an Android 9.0 emulator (API 28).

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  Solved How can I integrate an existing Qt project in another Qt project
  • Robin Hood

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  @Robin-Hood So please mark this thread as SOLVED now. Thanks!

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  Unsolved Rest Service
  • Jasur

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  Hi,

  From the looks of it, JSON-Server is for mockup backend creation so it won't really help you here if you want to validate that your database is working as expected.

  You can go with cutelyst or the Django REST framework, Flask RESTFul. etc.

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  Unsolved Cross-compiling for old ARM Embedded Linux. Lookup errors: undefined symbol
  • lukegluke

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  Unsolved Qt 5 Android development, QML properties to android element properties?
  • alft

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  Unsolved QThread with Android
  • ashajg

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  Thank you sir @J-Hilk

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  Unsolved QT Widgets not responding to touch event sometimes
  qt5.6.2 tslib touch issue • • Sreejith

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  Hard to figure out what is the issue. I tried with our board we are not seeing the same behaviour. If it is failing with Qt widgets, can you check with QML application. It is just to eliminate the possibilities.

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  Solved QML plugins path in iOS
  • Juan Garcia

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  Cool. You can move this issue to solved state.

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  Solved UNDEFINED REFERENCES ERROR while adding DCMTK Libs in QT project..
  • ashajg

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  This problem is solved by:

  not setting ANDROID_TOOLCHAIN_NAME in cmake by compiling source code in RELEASE mode.
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  Unsolved QtVirtualKeyBoard does not work after modal dialog exec in IMX6
  • James Haitching

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  @SGaist Hi,
  I have tested in Qt 5.9.7, the issue still exist.

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  Solved QML + MYSQL
  • Jasur

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  @SGaist I will try the REST service. Thank you a lot.

  Regards,
  Jasur

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  Unsolved text over a video
  • aforizma

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  Recent version of GStreamer should provide the qmlsink plugin. You could try to use that and write a QtQuick GUI with whatever you want to show.

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  Unsolved Is it possible use QML Drawer and SwipeView types as QWidgets?
  • Gourmet

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  @SGaist this could be very good addition for other desktop OSes not having this feature. Without this it is not possible create truly multiplatform software.

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  Solved Chinese font issue with Qt 4.8.4 under CE 6
  • -vix-

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  Glad you found out and thanks for sharing !

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

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  Unsolved Android - Send a simple notification
  • Xasin

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  @Xasin said in Android - Send a simple notification:

  How come Qt does not offer a native way of sending system notifications though, independent of the platform the application is being run on?

  Because its hard to get a common base for notifications (which actually helps in most use cases)
  Not every notification looks the same, nor is the origin which triggers the notification the same.
  For example on android normally an app doesn't need to trigger a notification, since it's only guaranteed that your app is running when the user has currently opened it. If the user switches away from your app, the android system might close your app for the sake of resources. So then there is no code to run to trigger the notification. You would need to create a background service to make sure your notification will be shown.

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  Unsolved QTDriver not Load
  • lucaynnofrota

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  @kmyukie Didn't you forgot "make install"?

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  Solved How to build emqtt/qmqtt for Android?
  • niclaslind

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  Hi,
  Thank you, I used that instead and it worked. :)