I've got problems with applications based on Qt Quick - they don't work properly on Android emulators with API > 24 (newer than Android 7.0).
Building and deploying are finished OK. But the application works only for the first time - if I quit an application (tap "back" or "home" or close the application) and open it again, only blank screen is appeared. This problems stays until I reinstall the app or clear app cache.
There's no that problem on real phones. Projects built in Android Studio don't have such problems as well.
Application based on Qt Widgets works correctly without blank screens.
The only suspicious thing I got from logcat is that (it logged after the second start of application):
06-04 10:06:24.976 1899 1989 W InputDispatcher: channel 'c7fea10 org.qtproject.example.testandroidqml/org.qtproject.qt5.android.bindings.QtActivity (server)' ~ Consumer closed input channel or an error occurred. events=0x906-04 10:06:24.977 1899 1989 E InputDispatcher: channel 'c7fea10 org.qtproject.example.testandroidqml/org.qtproject.qt5.android.bindings.QtActivity (server)' ~ Channel is unrecoverably broken and will be disposed!06-04 10:06:24.977 1756 1756 I Zygote : Process 4511 exited cleanly (0)06-04 10:06:24.977 1899 2568 I WindowManager: WIN DEATH: Window{c7fea10 u0 org.qtproject.example.testandroidqml/org.qtproject.qt5.android.bindings.QtActivity}06-04 10:06:24.977 1899 2568 W InputDispatcher: Attempted to unregister already unregistered input channel 'c7fea10 org.qtproject.example.testandroidqml/org.qtproject.qt5.android.bindings.QtActivity (server)'06-04 10:06:24.977 1899 3872 I ActivityManager: Process org.qtproject.example.testandroidqml (pid 4511) has died: cch CRE 06-04 10:06:24.977 1899 1917 W libprocessgroup: kill(-4511, 9) failed: No such process06-04 10:06:24.977 1899 1917 I libprocessgroup: Successfully killed process cgroup uid 10086 pid 4511 in 0ms06-04 10:06:24.978 1755 2486 W SurfaceFlinger: Attempting to destroy on removed layer: AppWindowToken{86cbd61 token=Token{a4f68c8 ActivityRecord{b83956b u0 org.qtproject.example.testandroidqml/org.qtproject.qt5.android.bindings.QtActivity t12}}}#006-04 10:06:24.979 1899 1922 W ActivityManager: setHasOverlayUi called on unknown pid: 451106-04 10:06:24.979 1755 1755 W SurfaceFlinger: couldn't log to binary event log: overflow.Why does it happen and how can I solve this issue?
My conditions:
- Ubuntu 22.04
- Project is simple - default one created with Qt Creator + red rectangle in
main.qmladded. It is built under Qt 5.15 with CMake - Emulator "Pixel XL" under API 28 (Android 9.0) from Android Studio
I tried:
- different emulators and different APIs (it doesn't work anywhere except Android 7.0)
- deploying with Qt Creator and manual apk installations - doesn't affect anything