Attached, please find Again - a small Android utility to resume / launch the "last" / "previous" activity.
I wanted a quicker way to switch back to a previous activity after I'd interacted with a home screen widget. This is possible via the Task Switcher, but I felt it took more steps than necessary -- especially when done repeatedly.
When one's home screen is visible and you want to "return" to the previously running activity.
After installation, place a launcher icon for Again on your home screen.
To use, launch Again.
The home screen is also an activity as is the dialog that appears to give one a choice as to what application to launch -- but I didn't want these launched so Again tries to avoid launching these.