The documentation for KeyEvent.ACTION_MULTIPLE says:
"multiple duplicate key events have occurred in a row, or a complex string is being delivered. If the key code is not {#link KEYCODE_UNKNOWN then the {#link getRepeatCount() method returns the number of times the given key code should be executed. Otherwise, if the key code is KEYCODE_UNKNOWN, then this is a sequence of characters as returned by getCharacters()."
But it doesn't say how to actually generate that event.
- I tried (rapidly) double-clicking the headset's Pause/Play button, but all I receive is ordinary ACTION_UP and ACTION_DOWN.
- I also tried pressing and holding down the headset's Pause/Play button, but all I receive is ordinary ACTION_UP and ACTION_DOWN.
How do I generate a KeyEvent.ACTION_MULTIPLE (as a user, using a headset control)?
Android's BaseMovementMethod includes code for handling ACTION_MULTIPLE so presumably the event is generated for key auto-repeat when the user holds down an arrow key.
I'm not sure, but I would think that ACTION_MULTIPLE would probably be triggered by actual buttons on a blutooth keyboard for instance. I think that the reason you're just getting ACTION_UP and ACTION_DOWN is because those are the pre-defined KeyEvents for your headset controls. I hope this helps. :)
来源：https://stackoverflow.com/questions/15286312/what-triggers-or-generates-keyevent-action-multiple