> On Oct 7, 2016, at 2:26 PM, Gianluca <[email protected]> wrote:
>
>>
>> Il giorno 07 ott 2016, alle ore 20:19, Eddie Sutton
>> <[email protected] <mailto:[email protected]>> ha
>> scritto:
>>
>>
>>> On Oct 7, 2016, at 2:15 PM, Gianluca <[email protected]
>>> <mailto:[email protected]>> wrote:
>>>
>>>>
>>>> Il giorno 07 ott 2016, alle ore 20:09, Eddie Sutton
>>>> <[email protected] <mailto:[email protected]>> ha
>>>> scritto:
>>>>
>>>> Thank you for your reply Jason.
>>>>
>>>>> On Oct 7, 2016, at 1:01 PM, Jason H <[email protected]
>>>>> <mailto:[email protected]>> 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
>>> <http://www.androiduipatterns.com/2011/03/back-button-behavior.html>
>>
>> So most Android users will be irritated if I intercept the back button and
>> do not let the app close??
>>
>> I thought the Android back button was supposed to back-track through the
>> apps the user had opened before the current app.
>
> :-D one thing is what the Android system does by default … another is what
> the users except :-D
> So, what users except are:
> - if the app is its very first screen, pressing back button will exit from
> the app and go to the home screen but when the user will open the app again
> is expecting to see exactly the same state as before like the app was in the
> background. So you should save the status and restart the app has it should
> never been stopped.
> - if the app is into an internal page, pressing back button will just
> navigate backward into the history (or app views structure) without exiting
> from the app.
>
> But unfortunately this is up to the programmers to do into the Android world
> :-(
I think since my UI is a tab control, I will let the app close and any
Bluetooth discovered devices or Bluetooth connections will be closed.
Then re-launching will re-start the app at the default tab and users will have
to scan again for B;bluetooth devices.
Thank you for taking time to explain it to me!
-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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