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In an android application for blind, the user writes with his hand on the screen to give input in order to interact with application to make a call. Suppose if the user types on screen ‘a’ letter then it should start searching the contacts starting with letter a. Is it possible to recognize input? I want some tutorials/example programs to start with. So please provide me the resources to approach this problem.
Have a look at the Gestures overlay support in Android, as of 1.6. I’ve experimented with this in the past, and works pretty well. You can ship the app with a ‘library’ of the alphabet, perhaps drawn and verified by several different people to teach the gesture library different strokes.