转到项目的。project文件，确保它显示的名称与项目文件夹中显示的名称相同。如果不是，请更改名称。它会起作用的。

这个问题也快把我逼疯了，但我知道原因是什么。问题是eclipse不够聪明，不能在自定义的工作空间文件夹中创建与项目同名的文件夹。

解决这个问题的方法是确保你所有的项目都在一个与你的项目名称匹配的文件夹中，否则它会直接将你所有的项目文件转储到这个目录中。您最终看到这个错误的原因是因为它认为您正在将一个项目放在另一个项目中(可能读取了项目配置文件)。

I noticed this is especially a problem when not using the default workspace path. The way I solve this problem is to just add the Project Name to the end of location. So let's say you are putting a project named "HelloWorld" into /Users/name/Documents/projects/android/, you would want to manually add "HelloWorld" to the end of it, like this: /Users/name/Documents/projects/android/HelloWorld. This would ensure that the project is put in it's own folder called "HelloWorld" and not inside some other project. Be sure that if there are any projects not within folders into a folder of the same name as the project to solve the errors.

今天我意外地解决了这个问题:

以下2个步骤可能不涉及，但不确定:

从(Eclipse菜单)调用*“/Window/Android SDK Manager”并更新a)“Android SDK Tools”“Android SDK平台工具”包 从Eclipse菜单“/Help/Check for Updates”调用并更新Eclipse。重新启动Eclipse。

以下步骤是必要的:

From eclipse menu "/File/Import/Android/Existing Android Code Into Workspace" Browse and select problematic project/or problematic projectS parent directory. Check "Copy projects into workspace". Check "Add projects into working sets". Press finish. [Optional scenario]: If project(s) and their containing folders have been renamed with the fully qualified package names then simply click on project node parent (where you see project package name instead of project's old name) in Eclipse and rename project with old name. Eclipse will rename folder too.

附注:在日蚀朱诺号上测试过。

Edit: Many times have passed since this answer and new Eclipse and Android SDK arrived. They have no much more problems during importing existing projects. The only thing one has to consider before importing is to move project folders(those ones one is willing to import) outside of eclipse workspace dir and then check checkboxes ("copy projects into working sets", "add projects into wokring sets") in import wizard dialog. Also I recommend doing this with latest Android SDK because it no more imports projects with dummy names and does not rename folders as it did in some custom cases.

我也一直在为类似的问题而绞尽脑汁。唯一有帮助的就是遵循这篇文章中的步骤。

将需要的代码复制到工作区文件夹之外的某个地方 使用该文件夹中的现有代码创建一个新项目 项目创建后，右键单击它并重构> Move 把它放到工作区文件夹中。(使用默认位置)

而不是从Android ->现有的Android代码导入工作空间，你必须使用通用->现有的项目到工作空间。这可能是一个解决方案。