从动作条改变方向时的Andr​​oid项目移到选项菜单 [英] Android items move from ActionBar to options menu when changing orientation

问题描述

我有一个基于应用程序中的碎片，其中一些碎片有我想提出的按钮进入其他操作的动作条，而一些不具备任何此类行动。我已经创建了一个包含所有项目的所有片段的XML菜单文件和I显示/隐藏在运行时根据所使用的片段的组合是当前显示：

I have a fragments based app where some fragments have additional actions that I want to put as buttons into the ActionBar, while some do not have any such actions. I have created an xml menu file that contains all the items for all the fragments and I show/hide at runtime depending on which fragment is currently shown using a combination of:

MenuItem item = menu.findItem(some_id);
item.setVisible(false);
MenuItem item = menu.findItem(some_other_id);
item.setVisible(true);

现在的问题是，当我看，有没有菜单项，如果我改变设备的方向，然后更改为不同片段的片段 - 与菜单项目 - 这些项目不会在出现在动作条，但只能访问使用该设备的菜单按钮。

The problem is that when I am viewing a fragment that has no menu items, if I change device orientation and then change to a different fragment - with menu items - those items do not show up in the ActionBar but are only accessible using the device's "Menu" button.

所有的菜单项都设置为安卓showAsAction =总是在XML文件中，但他们始终没有出现在动作条如果在观看片段，没有菜单项的最后一个方向的改变已完成。这发生在两个人像到风景和景观到人像的变化。

All menu items are set as android:showAsAction="always" in the xml file, yet they consistently fail to show up in the ActionBar if the last orientation change was done while viewing a fragment with no menu items. This happens during both portrait-to-landscape and landscape-to-portrait changes.

我如何可以强制在任何时候都显示在动作条的项目？

How can I force the items to be displayed in the ActionBar at all times?

推荐答案

两点：

1. 按照动作条设计文件，景观甚至是10平板电脑将只显示最多4个项目，每下面的图表中的操作栏：
2. 假设你正在项目，显示了最大数量的动作条，如果你想片段项添加到动作条片段 C>按照片段 - 添加项目到操作栏指南

1. Per the ActionBar design document, even a 10" tablet in landscape will only show a maximum of 4 items in the Action Bar per the below chart:
2. Assuming you are under the maximum number of items that show in the ActionBar, if you want Fragments to add items to the ActionBar when they appear and remove when they hidden, you do not need to manually show/hide items within a single xml menu file, but instead add the items in each individual Fragment per the Fragments - Adding items to the Action Bar guide.

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