Since devices generally use only one screen (activity) at a time, the previous screen is usually dormant and can be brought to the front (made active) simply by closing out of the present screen. The developer has the option of closing previous activities when the new screen (activity) is loaded.gcmartin wrote:
What you may pay attention to is how they demonstrate touch use to you. (Most elderly people "completely miss" the understanding of the "BACK" button, thus leading to some frustration. There is ONLY back....not forward ability, per se.
note: some devices, like the Samsung Note, have adopted the more familiar multi-windows approach, which will require writing apps in a different way.