如何克服 Android Studio 无法解析 android 类的符号
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how to overcome Android Studio cannot resolve symbol for android classes
提问by Idob
I'v just installed Android Studio 0.8.2 for my first time and I have a lot of "Cannot resolve symbol" errors. The errors occur on both new projects and projects which were exported from eclipse.
我第一次安装了 Android Studio 0.8.2，我有很多“无法解析符号”错误。新项目和从 eclipse 导出的项目都会发生错误。
JDK version: jdk1.8.0_11
JDK版本：jdk1.8.0_11
Android studio errors:
Android工作室错误：
Project's grade file
项目成绩文件
采纳答案by Akshit Rewari
In the menu bar
在菜单栏中
Select tools>-android>-SDK manager
选择工具>-android>-SDK管理器
and download the SDK build tools, SDK platform and Google API's( the Google API stores packages such as "import android.view.Menu" etc.) for the target SDK version of your project(20 as shown in your screenshot). if you are not sure which items you have to download , you can select all of them.(will take more time to download of course).
并为项目的目标 SDK 版本下载 SDK 构建工具、SDK 平台和 Google API（Google API 存储诸如“import android.view.Menu”之类的包）（屏幕截图中显示的 20 个）。如果您不确定必须下载哪些项目，您可以选择所有项目。（当然下载需要更多时间）。
Restart the IDE
重新启动IDE
回答by Priyanthi
You can do "File" -> "Invalidate Caches...", and select "Invalidate and Restart" option to fix this.
您可以执行“文件”->“使缓存无效...”，然后选择“无效并重新启动”选项来解决此问题。
回答by serv-inc
Android Studio suddenly cannot resolve symbolshelped:
- Exit Android Studio
- Back up your project
- Delete all the .iml files and the .idea folder
- Relaunch Android Studio and reimport your project
- 退出 Android Studio
- 备份您的项目
- 删除所有 .iml 文件和 .idea 文件夹
- 重新启动 Android Studio 并重新导入您的项目
回答by Karegyeya Calvin
I run into the same problem, i solved it by performing a clean project. To do this go to;
我遇到了同样的问题，我通过执行一个干净的项目来解决它。要做到这一点，请前往；
Select build>-clean project>
选择build>-clean project>
回答by Davide
If your library is an androidxone and never worked before, the problem is likely the one described in this other questioninstead.
回答by Albert
Delete folder: C:\Users\{your-user}\.AndroidStudio{your-version}\system\caches
删除文件夹：C:\Users\{your-user}\.AndroidStudio{your-version}\system\caches
It helped me
它帮助了我
