The camera application already contained on the phone cannot have a timer to set automatically and then take an image.
A possible solution is to use a surface view with a camera preview. Open source code can be found by the blogger Android-er which implements this:
http://android-er.blogspot.com/2010/12/add-overlay-on-camera-preview.html
This method does not affect the predefined camera settings and can easily be adapted to incorporate a timer and specific resolution settings.
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