[android-developers] Canvas or Gesture??

Hi guys
I have to make an application in which the user can sign on the
touchscreen and that signature
of his gets saved in the device and then if he clicks on the mail
button a mail is send with that sign image as an
attachment.

I spend some time doing this with gesture but now since i have googled
much i think canvas can also do this.
But my problem is that both of these are new to me so kindly suggest
what should be my pick and how should i plan my quest over this
particular problem.

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