我如何可以动态地改变操作栏的动作？ [英] How can I change Action Bar actions dynamically?

问题描述

我有一个动作条和标签导航的活动。我现在用的分割模式，所以标签在顶部和行动是在底部的酒吧。如何动态改变底部的动作？我需要这个，因为每一个标签都有不同的动作。

I have an Activity with ActionBar and tab navigation. I am using the split mode, so the tabs are at the top and actions are in the bottom bar. How can I dynamically change the bottom actions? I need this because every tab has different actions.

推荐答案

由于动作填充的活动的选项菜单中，您可以使用活动＃invalidateOptionsMenu（）。这将转储当前菜单，并再次拨打您的活动的 onCreateOptionsMenu / 在prepareOptionsMenu 的方法来重建它。

Since the actions are populated by the activity's options menu you can use Activity#invalidateOptionsMenu(). This will dump the current menu and call your activity's onCreateOptionsMenu/onPrepareOptionsMenu methods again to rebuild it.

如果你使用操作栏标签来改变你的片段配置有一个更好的办法。让每个片段管理自己的菜单部分。这些片段应该叫<一href="http://developer.android.com/reference/android/app/Fragment.html#setHasOptionsMenu%28boolean%29"><$c$c>setHasOptionsMenu(true).当有选项菜单项中添加或删除系统将自动失效选项菜单，并呼吁每个分段的 onCreateOptionsMenu / 在prepareOptionsMenu片段方法除了活动的。这样，每一个片段可以管理自己的项目，你不必担心手工执行菜单切换。

If you're using action bar tabs to change your fragment configuration there's a better way. Have each fragment manage its own portion of the menu. These fragments should call setHasOptionsMenu(true). When fragments that have options menu items are added or removed the system will automatically invalidate the options menu and call to each fragment's onCreateOptionsMenu/onPrepareOptionsMenu methods in addition to the activity's. This way each fragment can manage its own items and you don't need to worry about performing menu switching by hand.

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