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Swap ImageView or Drawable when implementing modal UI object?

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linux-howto

http://stackoverflow.com – I would like to implement a modal UI object. A user can toggle the mode of the object via gestures. Each mode displays a different image. My question is, should this be implemented by toggling the visibility of two overlapping ImageViews (one for each mode), or by togging two Drawables within a single ImageView? (HowTos)