嵌套首选项屏幕在Android中的Screenorientation更改时关闭

问题描述

我最近偶然发现一个问题.

I recently stumbled upon a problem.

我正在像这样使用嵌套的首选项屏幕:

I am working with a Nested PreferenceScreen like this:

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

<PreferenceScreen
    android:key="pref_name"
    android:title="@string/pref_title" >

</PreferenceScreen>

当我的屏幕将焦点放在嵌套首选项"屏幕上并且更改了屏幕方向时，嵌套首选项屏幕"将关闭.

When my screen has the focus on the Nested Preference Screen and I change screenorientation, the Nested PreferenceScreen closes.

我也尝试过包括:

android:configChanges="orientation|keyboardHidden"

在AndroidManifest.xml中，但无效.

in AndroidManifest.xml, but didn't work.

有人对此有解决方案吗?

Does anyone have a solution for this?

可能的解决方案:

我确实找到了解决方案.我以为是这行:

I did find the solution. I thought it was this line:

android:configChanges="keyboardHidden|orientation|screenSize"

推荐答案

知道了.为了防止嵌套屏幕在旋转时关闭，您需要确保为父屏幕指定了键值.而已.例如:

Got it. In order to prevent a nested screen from closing on rotation, you need to make sure the parent screen is given a key value. Thats it. Eg:

<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android"
    android:key="useless_key">

    <PreferenceScreen
        android:key="pref_name"
        android:title="@string/pref_title" >
    </PreferenceScreen>
</PreferenceScreen>

旁注，尽管重写onConfigChanges解决了该问题，但您几乎永远都不要这样做.它完全改变了活动的正常行为.轮换只是配置更改发生的众多原因之一.如果您的活动"无法正确处理轮换，那么在处理其他条件时也会失败.查看此有见地的帖子以获取更多信息.

Side note, though overriding onConfigChanges solved the issue, you should almost never do so. It completely changes how an Activity normally behaves. Rotation is just one of many reasons why a config change happens. If your Activity can't handle a rotation properly, then it'll also fail on handling those other conditions. Check out this insightful post for more.

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