Android Studio 3.1无法解析符号（主题，小部件，attr等） [英] Android Studio 3.1 Cannot Resolve Symbol (Themes, Widget, attr, etc.)

问题描述

我今天将Android Studio升级到3.1，现在Android Studio说它无法解析大多数资源的符号（例如 ThemeOverlay 样式.xml 或？attr / actionBarSize ）。到目前为止，这似乎并没有阻止我在模拟器中构建或运行，但这些错误让我感到紧张。

I upgraded Android Studio today to 3.1, and now Android Studio says it cannot resolve symbols for most of the resources (for example ThemeOverlay in styles.xml or ?attr/actionBarSize). This doesn't seem to prevent me from building or running in an emulator so far, but these errors are making me nervous.

是否还有其他人遇到此问题？我怎样才能解决它？我尝试过同步gradle和清理我的项目但它似乎没有任何帮助。

Has anyone else experienced this issue? How can I go about resolving it? I have tried syncing gradle and cleaning my project but it doesn't seem to help at all.

任何想法？

我正在使用带有Gradle版本4.4和Gradle插件3.1.0的Android Studio 3.1

I'm using Android Studio 3.1 with Gradle version 4.4 and Gradle Plugin 3.1.0

编辑：
此问题影响到Android Studio 3.1.1,3.1.2,3.1.3以及Gradle Plugin到3.1.1,3.1.2和3.1.3的更新。但是，下面的答案仍然有效。

This issue affects updating to Android Studio 3.1.1, 3.1.2, 3.1.3 as well as Gradle Plugin to 3.1.1, 3.1.2 and 3.1.3. However, the answer below still works.

推荐答案

关闭项目并再次导入。今天为我工作。

Close the project and import it again. Worked for me today.

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