Dont Assume Touchscreen or Keyboard

Android will support a variety of handset form-factors. That's a fancy way of saying that some Android devices will have full "QWERTY' keyboards, while others will have 40-key, 12-key, or even other key configurations. Similarly, some devices will have touch-screens, but many won't.

When building your applications, keep that in mind. Don't make assumptions about specific keyboard layouts -- unless, of course, you're really interested in restricting your application so that it can only be used on those devices.

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