[android-developers] put application in background run

hello,
I want the application will go in background in run mode when i will
press the home or back button.And when i want to come in front then it
will come in front.like when incoming call then application run
background but the call notification will display in front even if
other application is open.so what can i do.I have use the onkeydown
method for sending the application in background but the call
notification is display when call is come.but is show when we open the
application open.so if anybody have idea then plz tell me.

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