boolean function ( ) { return false ; }
performs an optional default action . for the case of an action provider placed in a menu item not shown as an action this method is invoked if previous callbacks for processing menu selection has handled the event . a menu item selection is processed in the following order : receiving a call to menuitem.onmenuitemclicklistener #onmenuitemclick menuitem.onmenuitemclicklistener.onmenuitemclick . receiving a call to android.app.activity #onoptionsitemselected menuitem activity.onoptionsitemselected menuitem receiving a call to android.app.fragment #onoptionsitemselected menuitem fragment.onoptionsitemselected menuitem launching the android.content.intent set via menuitem #setintent android.content.intent menuitem.setintent android.content.intent invoking this method . the default implementation does not perform any action and returns false . concode_field_sep SubUiVisibilityListener mSubUiVisibilityListener concode_field_sep View onCreateActionView concode_elem_sep void onSubUiVisibilityChanged concode_elem_sep boolean hasSubMenu concode_elem_sep void subUiVisibilityChanged concode_elem_sep void setSubUiVisibilityListener concode_elem_sep void onPrepareSubMenu