Dear All,

As I know , the service runs in background and can't receive the on key down event.
I want to run a service in background and when user trigger key event then show a alert dialog "some service was running".
How can I make a service to get the key event when some key event occur by indirectly approach?

You can't!
But what you could do: You could have your activity startService() with an intent that has an extra like "ShowVersion" or something like that and if the Service finds this, it'll display the dialog.