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  1. Qt
  2. QTBUG-65863

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

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P1: Critical
    • Resolution: Done
    • Affects Version/s: 5.9.4
    • Fix Version/s: 5.10.1, 5.11.0 Beta 2
    • Component/s: QPA
    • Labels:
      None
    • Platform/s:
      Android

      Description

      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.

        Attachments

          Issue Links

          is duplicated by

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-66077 [Qt 5.11 Alpha snapshot] "WARNING: QApplication was not created in the main() thread." from mapviewer example on Windows

          • Not Evaluated - Not yet evaluated/prioritized
          • Closed
          relates to

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-66238 5.9.3 -> 5.9.4 regression: fa2a653 causes startup hang on Android

          • P2: Important - Urgent, should be fixed, but will not stop the release.
          • Closed
          resulted from

          Bug - A problem which impairs or prevents the functions of the product. QTBUG-65820 QStandardPaths::AppDataLocation is worong ("/") in Android Debug builds with Qt 5.9.4 snapshot

          • P1: Critical - Urgent and Important, will STOP the release if matched with set FixVersion field. This includes regressions from the last version that are not edge cases; Data loss; Build issues; All but the most unlikely crashes/lockups/hanging; Serious usability issues and embarrassing bugs & Bugs critical to a deliverable. This is the highest possible priority for requirements.
          • Closed
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              People

              Assignee:
              vestbo Tor Arne Vestbø
              Reporter:
              esabraha Eskil Abrahamsen Blomfeldt
              Votes:
              1 Vote for this issue
              Watchers:
              4 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved:

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