question: public void overrideButton ( String button , boolean override ) { LOG . i ( "App" , "WARNING: Volume Button Default Behavior will be overridden.  The volume event will be fired!" ) ; if ( button . equals ( "volumeup" ) ) { webView . setButtonPlumbedToJs ( KeyEvent . KEYCODE_VOLUME_UP , override ) ; } else if ( button . equals ( "volumedown" ) ) { webView . setButtonPlumbedToJs ( KeyEvent . KEYCODE_VOLUME_DOWN , override ) ; } else if ( button . equals ( "menubutton" ) ) { webView . setButtonPlumbedToJs ( KeyEvent . KEYCODE_MENU , override ) ; } }
target:  Override the default behavior of the Android volume buttons. If overridden, when the volume button is pressed, the "volume[up|down]button" JavaScript event will be fired.