Recently, when a new Android project was introduced, it was not possible to import an existing project. The specific phenomenon is that every time the import window disappears, there is no additional error in the Eclipse's Package explorer without adding the newly imported engineering folder.
Common ways to import eclipse projects
1. file->import->existing Android Code into Workspace, eject the Import Project window and select the directory in which to import the project.
2. In the Package Explorer window, right-click->new->project...->android project from Existing Code, eject the Import Engineering window and select the directory in which to import the project.
I used the 2nd method, and I checked the copy project into workspace. By testing, I found that other projects could be imported, which showed that it was not a problem with Eclipse and ADT versions. An answer on StackOverflow http://stackoverflow.com/a/13405484/1767800 let me make it clear that the problem may be due to file format. After checking, it is found that the code in the Androidmanifest.xml file is not well-formed, so it cannot be imported and can be imported normally after modification.
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