Delphi Android application - handle mrCancel with ShowModal form

Question

I am using Marco Cantu's ShowModal example for Android applications. How do you handle for mrCancel

here is the my code:

procedure TForm1.Button1Click(Sender: TObject);
var
 Form2: TForm2;
begin
 Form2 := TForm2.Create(nil);
 Form2.ShowModal(
    procedure(ModalResult: TModalResult)
    begin
      if ModalResult = mrOK then
      begin
       ShowMessage('OK');
       Form2.DisposeOf;
      end
     { else
      begin
       ShowMessage('Cancel'); 
       Form2.DisposeOf;
      end;}
      end);
end;

How do I handle the mrCancel? If I have a form with controls the user must enter data in, i would like to give them the option to cancel out of the form and return to the main form.

I should note that I assigned the modalresult to mrCancel for the cancel button, just like i did mrOK for the OK button on the secondary form. The ok button works fine, but if i click the cancel button, the app does nothing and makes it so i cant click the OK button again.

I would have assumed I could have done the following

var
 Form2: TForm2;
begin
 Form2 := TForm2.Create(nil);
 Form2.ShowModal(
    procedure(ModalResult: TModalResult)
    begin
      if ModalResult = mrOK then
      begin
       ShowMessage('OK');
       Form2.DisposeOf;
      end
      end);
end;

and i should have been able to assign mrCancel to the modalresult property of the cancel button - but it does not work

Answer 1

You have to call DisposeOf() no matter what the ModalResult is. You are currently only calling it if the result is mrOk. Do this instead:

procedure TForm1.Button1Click(Sender: TObject);
var
  Form2: TForm2;
begin
  Form2 := TForm2.Create(nil);
  Form2.ShowModal(
    procedure(ModalResult: TModalResult)
    begin
      if ModalResult = mrOK then
        ShowMessage('OK')
      else
        ShowMessage('Cancel'); 
      Form2.DisposeOf;
    end
  );
end;