// 构建一个menubuilder对象
public MenuBuilder(Context context) {
mContext = context;
mResources = context.getResources();
mItems = new ArrayList<MenuItemImpl>();
mVisibleItems = new ArrayList<MenuItemImpl>();
mIsVisibleItemsStale = true;
mActionItems = new ArrayList<MenuItemImpl>();
mNonActionItems = new ArrayList<MenuItemImpl>();
mIsActionItemsStale = true;
setShortcutsVisibleInner(true);
}
/**
* * Sets whether the shortcuts should be visible on menus. Devices without hardware key input
* will never make shortcuts visible even if this method is passed 'true'.
*
* @param shortcutsVisible Whether shortcuts should be visible (if true and a menu item does not
* have a shortcut defined, that item will still NOT show a shortcut)
*/
public void setShortcutsVisible(boolean shortcutsVisible) {
if (mShortcutsVisible == shortcutsVisible) return;
setShortcutsVisibleInner(shortcutsVisible);
onItemsChanged(false);
}