Tracing the source code of the 5.1 Source for the View Class. It would seem that dispatchKeyEvent()
is the first method called by the system. Overloading it will prevent any and all key events from being called unless the base version is called.
dispatchKeyEvent()
‘s first move is to attempt to pass the event to an onKeyListener
if there is one. This is when onKey()
is called. If the onKey()
implementation returns true
, dispatchKeyEvent()
will return there and other events will not be called.
If there is no onKeyListener
or the onKeyListener
‘s onKey()
method returned false
, dispatchKeyEvent()
will then call the KeyEvent
‘s dispatch()
method. Which will then in turn call all the methods in the KeyEvent.Callback
interface on your view. This includes onKeyDown()
and onKeyUp()
.