I just wasted several hours tracking down a bug in the emulator.  It
turns out to have been found before:

  http://code.google.com/p/android/issues/detail?id=2423

Fortunately it does not seem to be a problem in any device.

In some configurations when the emulator is switched from Landscape to
Portrait (using CNTL-F11), onResume is called twice.  Actually the
entire lifecycle is executed twice. For most activities this should
not matter.  It was a problem for me because I was using onResume to
detect a static flag in another class and display a message to the
user, and then cancel that static flag.  But with the first lifecycle
going by so quickly, the user never sees the message.  I just think
this bug ought to be a little more publicized.

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