i have a question about android device

by minchoo » Wed, 29 Apr 2009 01:07:57 GMT

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I'm interest to develop android application.

but I have a question about android device.
Will every device that use android OS has physical 5-way direction
keys and 5 main keys(call, call end, home, menu, back)?
In the documents for developers, I read that developers can assume
those keys to develop application, but i'm wonder that those physical
keys are mendatory things for device manufacture company.
If the device doesnt's support those physical keys, is it okey to use
applications which are sold in android market?

Plz let me know that can i assum and use those keys to develope my


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