更新到4.2RC1，透明活动不起作用?突然黑 [英] Updated to 4.2RC1 and transparent activities do not work ? Suddenly black

问题描述

我有一个菜单项活动，出现在另一项活动上.

I have a sidemenu activity which appears over another activity.

<style name="Sidemenu" parent="Usual">
    <item name="android:windowBackground">@android:color/transparent</item>
    <item name="android:windowIsTranslucent">true</item>

    <item name="android:windowContentOverlay">@null</item>
    <item name="android:backgroundDimEnabled">false</item>
    <item name="android:colorBackgroundCacheHint">@null</item>
</style>

它一直运行良好.正常情况下，您可以在下面看到活动.

It has been working perfectly. As normal, you can see the activity below.

但是我只是将Android Studio更新为4.2RC1 ..

However I simply updated Android Studio to 4.2RC1 ..

现在..它不起作用！

下方区域为黑色.

完全神秘.

有什么解决方案吗?

推荐答案

此惊人的旧帖子由几年前存在类似问题的地方提供:

courtesy this amazing old post where there was a similar problem a few years ago: https://stackoverflow.com/a/35915764/294884

(1)这是另一个机器人活动/主题错误

(1) It's yet another droid activity/theme bug

(2)在清单中，您必须将主题设置为Theme.AppCompat.Dialog

    // side menu
    <activity android:name=".. LeftMenu" android:theme="@style/Theme.AppCompat.Dialog" />
    <!-- beware of insane droid transparent activity bug... -->

(3)仅在代码中，可以将主题设置为主题.(超级之前这样做)

(3) Only in code, can you set the theme to your theme. (Do so before super)

protected void onCreate(Bundle savedInstanceState) {
    setTheme(R.style.YourTransparentTheme);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.aty_leftmenu);
}

(4)您自己的样式主题为:

(4) Your own theme in styles will be:

<style name="YourTransparentTheme" parent="YourGeneralTheme">
    <item name="android:windowBackground">@android:color/transparent</item>
    .. and other colors etc you desire ..
</style>

为什么只需要window的详细信息背景: https://stackoverflow.com/a/67040753/294884

总而言之，该错误的解决方法是:

In summary the workaround for the bug is:

(旁边:请注意，如果大多数活动都具有标题栏(因此基于Theme.AppCompat.Light)是没有问题的，但是透明活动没有标题栏(因此基于Theme.AppCompat.Light).NoActionBar).这样一来，您可以拥有通常的情况，其中左菜单"或类似内容也涵盖了主应用程序的标题栏.

(Aside: Note that it is no problem if most of your activities have a title bar (so based on Theme.AppCompat.Light), but your transparent activity has no title bar (so based on Theme.AppCompat.Light.NoActionBar). In that way you can have the usual thing where a "left menu" or similar covers also the title bar of the main app.)

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