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Created attachment 9704 [details]
source code for one ContentPage with one button, example of the bug
bool result = await DisplayAlert("Proceed?", "Would you like to proceed?", "Accept", "Cancel");
await DisplayAlert("", "Selected: Accept", "OK");
await DisplayAlert("", "Selected: Cancel", "OK");
If an user taps the "Cancel" button, it works as expected.
But if an user presses the physical BACK button,
the dialog itself disappears, but the code in 'if' statement does not execute
and the app has no idea that the dialog has been dismissed.
I made a suggestion how to fix it in the forum page: https://forums.xamarin.com/discussion/comment/94987/#Comment_94987
To briefly repeat: implementation in Xamarin.Forms.Platform.Android.AndroidActivity and Xamarin.Forms.Platform.Android.FormsApplicationActivity is missing the event handler for CancelEvent:
alertDialog.CancelEvent += (o, args) => arguments.SetResult(false);
MessagingCenter.Subscribe<Page, AlertArguments>((object) this, "Xamarin.SendAlert", (System.Action<Page, AlertArguments>) ((sender, arguments) =>
AlertDialog alertDialog = new AlertDialog.Builder((Context) this).Create();
if (arguments.Accept != null)
alertDialog.SetButton(-1, arguments.Accept, (EventHandler<DialogClickEventArgs>) ((o, args) => arguments.SetResult(true)));
alertDialog.SetButton(-2, arguments.Cancel, (EventHandler<DialogClickEventArgs>) ((o, args) => arguments.SetResult(false)));
}), (Page) null);
I have checked this issue and able to reproduce this issue.
When I open the alert box and press the back button I observed that the disappears from the screen.
IDE logs: https://gist.github.com/RamChBachkheti/626c2f8b16f500562e33
Device logs: https://gist.github.com/RamChBachkheti/b0d768b2a8166dbb8ed9
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It should also not allow you to touch outside of it which currently makes it disappear.
Should be fixed in 1.3.4. Touch outside is how android alerts are meant to work, it is equal to the cancel action.
From alemarko comments on the thread:
"This also fixes the touches from the outside of the dialog => now they also behave as the cancel button press. Preventing outside touches altogether can be done, and personally I would like that (though maybe this could be done as a user settable global setting for Android apps based on Xamarin.Forms: developers could enable outside touches if required):
Any chance you could add this also. Most modal dialogs only allow you to use the buttons and input fields that are presented.