[Interest] Qt 5.6.1 widget app terminates if do not accept Android back key ?

[Gianluca]

> Il giorno 07 ott 2016, alle ore 20:09, Eddie Sutton <eddie.of.the.spam at gmail.com> ha scritto:
> 
> Thank you for your reply Jason.
> 
>> On Oct 7, 2016, at 1:01 PM, Jason H <jhihn at gmx.com <mailto:jhihn at gmx.com>> wrote:
>> 
>> It seems like the activity catches it and removes itself from the stack.
>> Is it crashing? If so paste the exception.
> 
> I think maybe you are correct.
> 
> I see no exceptions in adb.  Instead it appeared the app was closed deliberately.  
> 
> Perhaps the problem is that I do not understand the Android back button.  Does an Android user expect the back button to close an app?
> 
> 
> D/TSR     (25898): ../source/source/mainwindow.cpp:812 (virtual void tcmw::MainWindow::closeEvent(QCloseEvent*)): ************************* C L O S E ******************
> 
> I/ActivityManager(  563): Process com.ditchwitch.tsr (pid 25898) (adj 9) has died.
> I/WindowState(  563): WIN DEATH: Window{42c61a48 u0 com.ditchwitch.tsr/com.ditchwitch.tsr.tsractivity.TsrActivity}
> W/WindowManager(  563): Force-removing child win Window{42caa3f8 u0 SurfaceView} from container Window{42c61a48 u0 com.ditchwitch.tsr/com.ditchwitch.tsr.tsractivity.TsrActivity}
> 
> 
> 
> I expected Android button to retain my app state, suspend app to background, then restore suspended state when reactivated.

Default behavior of Android on back button is to terminate the application.
If you don’t want this behavior you have to capture the back button and handle.
This is not Qt thing … it happens also if you are programming in Java.

http://www.androiduipatterns.com/2011/03/back-button-behavior.html


> 
> 
> -Ed
> 
> 
>> >Has anyone seen this?
>>  
>> I cannot find any useful clues in adb.
>>  
>> The app terminates unless I add a keyReleaseEvent to accept the Key_Back.
>>  
>>  
>> #if defined(Q_OS_ANDROID)
>> ///
>> ///  Android back button kills TSR ?
>> ///
>> /// Adding a keyReleaseEvent that accepts the event prevents the crash.
>> /// I do not understand reason why.
>> ///
>> /// Ignoring the Android back button will annoy users but is better than crashing.
>> ///
>> void MainWindow::keyReleaseEvent(QKeyEvent *event)
>> {
>>     if( Qt::Key_Back == event->key())
>>     {
>>         qDebug("Android Back button");
>>         event->setAccepted(true);
>>     }
>> }
>> #endif
>>  
>> Thanks in advance,
>>  
>> -Ed
>>  
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