Native Development

[thorbjrn]

Hi there!,

I have a problem developing a BlackBerry 10 app. I am using the Blackbery 10 Alpha Device.

When exiting my app (by swiping up from bottom of screen, and pressing close), the app-icon becomes transparent and I can't click it anymore. The only way to start the app again, is then by restarting the device.

What am I doing wrong?

Cheers,

Thorbjørn

[mzex]

App icon is transparent if your app is still running. You must have some bug in your destructor or similar. Check all code, which run when app should be  destroyed.

[peter9477]

To avoid having to restart the device, you can use Momentics to kill the process, or SSH in, use "pidin" to find the process id, and "slay" to issue a signal (SIGTERM etc) to kill it. The icon will "recover" at that point and you can restart the app.

That should help you troubleshoot the issue a bit faster. ;-)

[yalnte]

I'm also having this problem when closing via the navigator window. However, if I call exit(0) via a button in my app it closes graciously and the icon is opaque. This implies to me that my app isn't receiving the NAVIGATOR_EXIT signal correctly.

My app uses Qt/C++ so I tried reimplementing the closeEvent() function to simply call exit(0). However the transparent behaviour is the same.

Any ideas please?

[thorbjrn]

Thanks for the answers!

I am also able to properly exit my app by calling "exit(0)".

The problem is that I don't know what is being run, when I exit by using the close button (seen by swiping up).

Cheers,

Thorbjørn

[yalnte]

I think this Qt/C++ BB10 example may hold some clues:

https://github.com/spstarr/qt-pictureflow-bb10/blob/master/pictureflow-qt/main.cpp

It connects the signals lastWindowClosed() and aboutToQuit() to the quit() slot:

  app->connect( app, SIGNAL(lastWindowClosed()), app, SLOT(quit()) );
  app->connect( app, SIGNAL(aboutToQuit()), app, SLOT(quit()) );

 I've tried adding this to my app, but it hasn't yet made a difference - I'm convinced this has something to do with it, so I'm going to try pursuing this route for now.

[yalnte]

I seem to have worked around the issue by having these two statements as my first two lines of code:

int main(int argc, char **argv)
{
   QCoreApplication::addLibraryPath("app/native/lib");
   QApplication a(argc, argv);

   // Attempt to stop app displaying in portrait mode
   navigator_set_orientation_mode(NAVIGATOR_LANDSCAPE,NULL);
   navigator_rotation_lock(true);
   ...

   a.connect( &a, SIGNAL(lastWindowClosed()), &a, SLOT(quit()) );
   a.connect( &a, SIGNAL(aboutToQuit()), &a, SLOT(quit()) );

    
   return a.exec();

}

 Not sure if that's all necessary, but it seems to work for now. Only issue is that it now brings back the problem I had with the app displaying in portrait mode as described in the forum post here. But it's an improvement of sorts ...