When the application runs, it will stay at a banner page for 3 seconds.
So my question is what size of that banner should I prepare and
is it one set of image is fine?
When the application runs, it will stay at a banner page for 3 seconds.
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It depends on your targeting resolution. To get better result you should use multiple images for different dpi and resolution. follow this guideline: http://developer.android.com/guide/practices/screens_support.html