[android-developers] Need your help: how to monitor the dialpad key press action in another application during an active call?

My last request can't be meet so I just repost it.

Hi All,

I know that I can't replace the default InCallScreen when the call has
been set up, but I really want to show some additional info during the
call, so I want to create one new activity which is transparent and
always above the default InCallScreen.

The question is that I want to display different info when the caller
dials some special key (1-9,*,#), how can I get this key press
notification?
Could somebody help me out?

Thanks in advance.

Xavier

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