I am newbie to android application development. I am currently developing a virtual keyboard with unicode characters. As the number of characters are too many to be displayed on the keyboard, some of them are hidden and only showup when the user preses a similar key. For example, in my cellphone, when I press A, the characters "A", "B", "C" will be displayed as popup keys to let me choose one of them. I just want to implement virtual keyboard similar to my cellphone's keyboard. I know how implement virtual keyboard using the KeyboardView and Keyboard classes, and keyboard xml resource.
Can anyone give me a hint on how to display popup keys?