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  1. Qt
  2. QTBUG-65863

"QApplication is not created on main thread" in same game example

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: P1: Critical P1: Critical
    • 5.10.1, 5.11.0 Beta 2
    • 5.9.4
    • QPA
    • None
    • Android

      When running an unmodified version of same game on Android, you can get the "QApplication is not created on main thread" warning. This indicates that something has called QThread::currentThread() before initializing the Q*Application, causing the Android main thread to be registered instead of the Qt main thread. This may lead to crashes later on, specifically for event deliveries and signal/slot bindings, if I recall correctly.

      Reportedly it only happens in debug mode, so it is probably due to a global static QObject, which has some debug-specific calls that have proven to be the cause of this before.

        For Gerrit Dashboard: QTBUG-65863
        # Subject Branch Project Status CR V
        218705,3 Android: Defer initialization of logging rules until qApp construction 5.10.1 qt/qtbase Status: MERGED +2 0
        219332,2 Android: Defer initialization of logging rules until qApp construction 5.9 qt/qtbase Status: MERGED +2 0

            vestbo Tor Arne Vestbø
            esabraha Eskil Abrahamsen Blomfeldt
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              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes