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Thread: <SOLVED> How to use QGuiApplication::applicationStateChanged in normal application

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    Default <SOLVED> How to use QGuiApplication::applicationStateChanged in normal application

    I'm creating an application for android device, and I want to use android activities "signals" (onPause etc.). I read that I can use QGuiApplication::applicationStateChanged() signal to check my application state, but I don't know how (and if it's possible) to use this signal in 'normal' QApplication app, not QML. Or maybe if there is some other way of getting those signals in my application?
    Last edited by cszawisza; 27th May 2014 at 21:24.

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    Default Re: How to use QGuiApplication::applicationStateChanged in normal application


  3. The following user says thank you to anda_skoa for this useful post:

    cszawisza (27th May 2014)

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    Default Re: How to use QGuiApplication::applicationStateChanged in normal application

    When using AGuiApplication instead of QApplication, you just need to connect signal to slot, that's simple But...
    Normally simple, created by QtCreator applications starts with main function like
    Qt Code:
    1. int main(int argc, char *argv[])
    2. {
    3. QApplication a(argc, argv);
    4. MainWindow w;
    5. w.show();
    6.  
    7. return a.exec();
    8. }
    To copy to clipboard, switch view to plain text mode 
    I can not simply change QApplication to QGuiApplication because
    Qt Code:
    1. QWidget: Cannot create a QWidget without QApplication
    To copy to clipboard, switch view to plain text mode 
    So I need to have a QApplication object to run my application, and while I'm using it, I can't create a QGuiApplication object... So it can not by solved using simple signal to slot connection.

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    Default Re: How to use QGuiApplication::applicationStateChanged in normal application

    QApplication is-a QGuiApplication and has all those signals and more.

  6. The following user says thank you to ChrisW67 for this useful post:

    cszawisza (27th May 2014)

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    Default Re: How to use QGuiApplication::applicationStateChanged in normal application

    QApplication
    Signals:
    8 signals inherited from QGuiApplication
    I don't know how I missed that... Thanks

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