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public static interface ActionMode.Callback

android.support.v7.view.ActionMode.Callback

操作模式的回调界面。提供给startSupportActionMode(Callback) （Callback）}，回调配置并处理用户与动作模式交互引发的事件。

行动模式的生命周期如下：

onCreateActionMode(ActionMode, Menu) once on initial creation
onPrepareActionMode(ActionMode, Menu) after creation and any time the ActionMode is invalidated
onActionItemClicked(ActionMode, MenuItem) any time a contextual action button is clicked
onDestroyActionMode(ActionMode) when the action mode is closed

Public methods
`abstract boolean`	`onActionItemClicked(ActionMode mode, MenuItem item)` 打电话报告用户点击一个操作按钮。
`abstract boolean`	`onCreateActionMode(ActionMode mode, Menu menu)` 第一次创建动作模式时调用。
`abstract void`	`onDestroyActionMode(ActionMode mode)` 当行动模式即将退出并被销毁时调用。
`abstract boolean`	`onPrepareActionMode(ActionMode mode, Menu menu)` 被调用以在操作模式失效时刷新操作模式的操作菜单。

boolean onActionItemClicked (ActionMode mode, 
                MenuItem item)

打电话报告用户点击一个操作按钮。

Parameters
`mode`	`ActionMode`: The current ActionMode
`item`	`MenuItem`: The item that was clicked

Returns
`boolean`	true if this callback handled the event, false if the standard MenuItem invocation should continue.

boolean onCreateActionMode (ActionMode mode, 
                Menu menu)

第一次创建动作模式时调用。所提供的菜单将用于生成操作模式的操作按钮。

Parameters
`mode`	`ActionMode`: ActionMode being created
`menu`	`Menu`: Menu used to populate action buttons

Returns
`boolean`	true if the action mode should be created, false if entering this mode should be aborted.

void onDestroyActionMode (ActionMode mode)

当行动模式即将退出并被销毁时调用。

Parameters
`mode`	`ActionMode`: The current ActionMode being destroyed

boolean onPrepareActionMode (ActionMode mode, 
                Menu menu)

被调用以在操作模式失效时刷新操作模式的操作菜单。

Parameters
`mode`	`ActionMode`: ActionMode being prepared
`menu`	`Menu`: Menu used to populate action buttons

Returns
`boolean`	true if the menu or action mode was updated, false otherwise.