Interface for converting text key events into edit operations on an Editable class. Note that for most cases this interface has been superceded by general soft input methods as defined by Android.Views.InputMethods.InputMethod; it should only be used for cases where an application has its own on-screen keypad and also wants to process hard keyboard events to match it.

Key presses on soft input methods are not required to trigger the methods in this listener, and are in fact discouraged to do so. The default android keyboard will not trigger these for any key to any application targetting Jelly Bean or later, and will only deliver it for some key presses to applications targetting Ice Cream Sandwich or earlier.

[Android Documentation]