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Android has a gesture recognition API in 2.2, implemented by one of the creators of the $1 recognition algorithm (the one implemented in the article).

The creators of 'one-dollar' released the next generation of the algorithm, the $N multistroke algorithm, and here's an implementation of it in javascript: http://depts.washington.edu/aimgroup/proj/dollar/ndollar.htm...

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Is the Android gesture recognition API you speak of purely back-end and not available in webkit?

Yes it is native, and no javascript bindings have been made for Android's webkit engine. It is packaged as a UI control that you overlay onto your application window and receive gesture events trhough it.

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