Recently I'm looking at the keycode page provided by Google:

http://developer.android.com/reference/android/view/KeyEvent.html

As we know after screen unlocked, there is a white circle with six dots above the HOME key, which can be clicked to enter the APPS tab. However after tried around, I can't find which key is handling it. I tried KEYCODE_BUTTON_MODE, KEYCODE_APP_SWITCH, KEYCODE_MENU, KEYCODE_HOME and some others, none of them works.

Is that icon an actual key? Or it's just a pixel area on the screen?

Thanks.

Botao