[android-developers] onWindowFocusChanged() happens more than once when resuming the application from the homescreen or app drawer

Scenario 1 - NORMAL

###################### application activity started ###########################

03-31 17:52:18.413: INFO/System.out(589): onCreate()

03-31 17:52:18.974: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:true

03-31 17:52:18.974: INFO/System.out(589): mySoundPlaybackMethods()

########## back button pressed to remove activity from the task ###############

03-31 17:54:54.113: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:false

03-31 17:54:54.514: INFO/System.out(589): onDestroy()

###################### application activity finished ##########################

Scenario 3 - ABNORMAL

######################## application activity started ##########################

03-31 18:16:55.823: INFO/System.out(589): onCreate()

03-31 18:16:56.124: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:true

03-31 18:16:56.139: INFO/System.out(589): mySoundPlaybackMethods()

############################# HOME button pressed ##############################

03-31 18:17:03.244: INFO/System.out(589): onSaveInstanceState() -> state saved

03-31 18:17:03.424: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:false

####################### Landed onto homescreen launcher ##########################

########### Pressed on the application button to go back to the task #############

03-31 18:18:51.544: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:true

03-31 18:18:51.593: INFO/System.out(589): mySoundPlaybackMethods()

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?????? in the following output, why should the same steps of windowFocusChanged false->true and soundPlayback happen ONCE AGAIN ??????

---------------------------------------------------------------------------------------------------------------

03-31 18:18:52.404: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:false

03-31 18:18:52.424: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:true

03-31 18:18:52.484: INFO/System.out(589): mySoundPlaybackMethods()

############## back button pressed to remove activity from the task ################

03-31 18:20:00.204: INFO/System.out(589): onWindowFocusChanged() -> hasFocus:false

03-31 18:20:00.344: INFO/System.out(589): onDestroy()

######################### application activity finished ############################

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