I have dialog with custom view and two buttons(Save/Cancel). Then user click "Save" I want to validate entered infromation. If it incorrect, dialog should not be dismissed. But it is always dismissed after click.
Is it possible to change this?

That doesn't make sense to me...The user can't change anything if the dialog is active because of incorrect data. I think it would be better to close the dialog and show the user where the incorrect data are and ask for correcting the input...