您的项目缺少从SDK的支持库。

Your project is missing the support library from the SDK.

如果你没有安装的话，只需右键单击项目>安卓工具>安装支持库。

If you have no installed them, just right click on the project > Android Tools > Install support library.

然后，只需导入到工作区中，作为一个Android项目，Android的支持-V7-appcompat，坐落在$ {Android的SDK路径} /演员/安卓/支持/ V7

Then, just import into workspace, as an Android project, android-support-v7-appcompat, located into ${android-sdk-path}/extras/android/support/v7

最后，单击鼠标右键，在Android项目>属性> Android的标签。按Add按钮，添加支持项目Android的支持-V7-appcompat的依赖。

And finally, right click in the Android project > Properties > Android Tab. Push the Add button and add the support project "android-support-v7-appcompat" as dependency.

清理项目和必须编译和正常工作。

Clean your project and the must compile and work properly.