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Added in API level 14

public static interface MenuItem.OnActionExpandListener

android.view.MenuItem.OnActionExpandListener

当标记为 SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW的菜单项展开或折叠时，将调用回调的接口定义。

也可以看看：

Public methods
`abstract boolean`	`onMenuItemActionCollapse(MenuItem item)` 当包含 `SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW`的菜单项折叠时调用。
`abstract boolean`	`onMenuItemActionExpand(MenuItem item)` 当带有 `SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW`的菜单项展开时调用。

Added in API level 14

boolean onMenuItemActionCollapse (MenuItem item)

当包含 SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW的菜单项折叠时调用。

Parameters
`item`	`MenuItem`: Item that was collapsed

Returns
`boolean`	true if the item should collapse, false if collapsing should be suppressed.

Added in API level 14

boolean onMenuItemActionExpand (MenuItem item)

当带有 SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW的菜单项展开时调用。

Parameters
`item`	`MenuItem`: Item that was expanded

Returns
`boolean`	true if the item should expand, false if expansion should be suppressed.