Eclipse 给出错误，最近更新后缺少 R.java 文件
我已将我的 SDK 和 ADT 更新到最新版本，我还将 Eclipse 更新为 Kepler Juno 之后的最新版本.
I have updated my SDK and ADT to the latest version, I have also update the Eclipse to Kepler the latest one after Juno.
我的 ADT 版本是 22.0.在此更新之后，当我创建一个新项目时，我收到错误，指出 R 无法解析为变量.我已导入 import android.R;，但它显示为未使用的导入说明 Don't include android.R here;而是为每个用法使用一个完全限定的名称.
My ADT version is 22.0. After this update when I create a new project, I'm getting error, stating R cannot be resolved to a variable. I have imported import android.R;, but it is showing as unused import stating Don't include android.R here; use a fully qualified name for each usage instead.
最新更新的 Mac OS 也发生了同样的事情.我尝试将 activity_main.xml 重命名为其他名称，但仍然没有生成我的 R.java.
Same thing is happening with Mac OS also with the latest update. I have tried renaming activity_main.xml to other name, but still my R.java is not generated.
尝试了所有可能的事情.清理项目，构建整个工作区.没有任何帮助.
Tried all the things which are possible. Cleaned the project, build the whole workspace. Nothing helping.
我认为更新后ADT或Eclipse兼容性有问题.
I think ADT or Eclipse compatibility is having problem after the update.
我已经更新了我的整个 SDK，这是屏幕截图，但同样的问题存在.
I have updated my whole SDK, here is the screenshot, but same problem is there.
推荐答案
更新到 SDK Tools 到 rev.22 第一次，您可能需要重新启动 Android SDK Manager 并安装一个新项目:Android SDK Build-tools.
After updating to SDK Tools to rev. 22 for the first time, you may need to relaunch Android SDK Manager again and install a new item: Android SDK Build-tools.
安装后，清理您的项目并重建.
After installing this, clean your projects and rebuild.
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