How to catch the back button on Android in Delphi xe?

Question

Delphi

There is a menu that is displayed in Multiviewer, when you click on an item, it hides and displays the main form. how to make it so that when you press the back button, this menu returns, and double-clicking back exits the program?

Answer 1

if Key = vkHardwareBack then
begin
Key := 0;
end; - the answer if anyone needs it!