Why references to library libraries fail in eclipse

In two different cases

Situation One:

A red fork appears below: The description library is not in the same directory as the project

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That is, the project must be in the same directory as the library under Windows, or it will go wrong

Situation Two

The following mpchartlib are green hooks, and when OK is confirmed, they are not applied when they return.

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Cause the Project.Properties file under project is not writable and is read-only (most of the collaboration tools are causing it)

Resolve directly into the Project.Properties file, write directly:android.library.reference.3=. /mpchartlib(depending on the way the library is, even if it does)

Or set the Project.Properties file to a writable state (click on the project.properties file, you can pop up the hint, select writable ), then rely on the library to

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Why references to library libraries fail in eclipse