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public static interface ActionBar.TabListener

android.support.v7.app.ActionBar.TabListener

此接口已弃用。
内置工具栏操作栏不支持操作栏导航模式。考虑使用其他common navigation patterns来代替。

在选项卡聚焦，未聚焦，添加或删除时调用的回调接口。

Public methods
`abstract void`	`onTabReselected(ActionBar.Tab tab, FragmentTransaction ft)` 当用户再次选择了已经选择的标签时调用。
`abstract void`	`onTabSelected(ActionBar.Tab tab, FragmentTransaction ft)` 当选项卡进入选定状态时调用。
`abstract void`	`onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft)` 当选项卡退出选定状态时调用。

void onTabReselected (ActionBar.Tab tab, 
                FragmentTransaction ft)

当用户再次选择了已经选择的标签时调用。某些应用程序可能会使用此操作返回到类别的顶层。

Parameters
`tab`	`ActionBar.Tab`: The tab that was reselected.
`ft`	`FragmentTransaction`: A `FragmentTransaction` for queuing fragment operations to execute once this method returns. This FragmentTransaction does not support being added to the back stack.

void onTabSelected (ActionBar.Tab tab, 
                FragmentTransaction ft)

当选项卡进入选定状态时调用。

Parameters
`tab`	`ActionBar.Tab`: The tab that was selected
`ft`	`FragmentTransaction`: A `FragmentTransaction` for queuing fragment operations to execute during a tab switch. The previous tab's unselect and this tab's select will be executed in a single transaction. This FragmentTransaction does not support being added to the back stack.

void onTabUnselected (ActionBar.Tab tab, 
                FragmentTransaction ft)

当选项卡退出选定状态时调用。

Parameters
`tab`	`ActionBar.Tab`: The tab that was unselected
`ft`	`FragmentTransaction`: A `FragmentTransaction` for queuing fragment operations to execute during a tab switch. This tab's unselect and the newly selected tab's select will be executed in a single transaction. This FragmentTransaction does not support being added to the back stack.