[android-developers] how to receive an event while moving through buttons

I am trying to implement a piano app in android. I have just 8 notes
and 8 buttons for each note. I implemented onTouch for every button,
and there is no problem when I just touch one button. But when I touch
a button and move my finger to the next one, than the onTouch function
for that button is not called and it is ignored. How can I manage to
play notes during sliding my finger on the buttons without taking my
finger up? I am really stuck here.

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