[Interest] Qt positioning

[Kalinowski Maurice]

Hi,

You could do multiple checks. First, which positioningMethods are available/supported, check the corresponding property. What is the interval set to, if it is too small, you might get a timeout. Does the PositionSource  send updateTimeout()?

BR,
Maurice

Von: interest-bounces+maurice.kalinowski=theqtcompany.com at qt-project.org [mailto:interest-bounces+maurice.kalinowski=theqtcompany.com at qt-project.org] Im Auftrag von Federico Buti
Gesendet: Tuesday, August 11, 2015 2:24 PM
An: interest at qt-project.org
Betreff: [Interest] Qt positioning

Hi list,

I was playing around with positioning on Android and I'm not sure if I'm using it properly. I would like to update the position of the cellphone/app ASA the user taps on a button. To achieve this result I've setup my project as follows:

1) added the positioning to the pro:

    QT += positioning


2) Added the positioning import to the involved QML file:

    import QtPositioning 5.2   // should/must be "import QtPositioning 5.3" or others?


3) Added permissions to manifest

     <uses-permission android:name="android.permission.INTERNET"/>

   <uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>

   <uses-permission android:name="android.permission.ACCESS_LOCATION_EXTRA_COMMANDS"/>

   <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>


4) Added the following code:



 StyledButton {

                id: mapMarkerButton

                Layout.alignment: Qt.AlignHCenter

                Layout.preferredHeight: 120 * Params.scaleFactor

                Layout.preferredWidth: 120 * Params.scaleFactor

                sourceUncheckedImage: "qrc:///pics/pin.png"



                onClicked: {   gpsPosition.start()  }

            }

​PositionSource {

            id: gpsPosition

            active:

​false



            onPositionChanged: {

​

gpsPosition.st

​op()

​



​

var coord = position.coordinate;

                updateCoordinatesRecord(coord.latitude, coord.longitude) //41.902222, 12.492222)

            }



            onSourceErrorChanged: {

​​



                notify("

​...

")

            }
}​


​The idea was to activate the GPS ​only when required, update the value (probably with a busy dialog on screen) and deactivate it. I could have used the update() method, I know.

Now, if I execute the code on a device with GPS turned off, I've the error "PositionSource.ClosedError". Instead, on the same device with GPS turned on the position is never updated. The same occurs in a newly created project with just this code added.

Qt version is 5.5

What am I missing? What am I doing wrong? The default dialog for GPS activation (i.e. the one shown by Googlemaps for instance) is not shown when position acquisition is started?


Thanks everyone for your time,
F.



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