The imported Android project has a red exclamation point and an android exclamation point.

The imported Android project has a red exclamation point and an android exclamation point.

[Cause] An import package exists in the project. After the project is imported, the path of the package pointed to by classpath is incorrect, that is, you need to re-bucket path

Solution: Right-click the project name BuildPath-> Configure Build Path, and find the package with the Red Cross number in Libraries on several tabs. Modify the current path of the corresponding package in classpath, that is, the path of your SDK. Then return to eclipse F5 to refresh the project

[Note] If there are still errors, the android Development sdk version is incorrect.