How to create a shared library to be used with <uses-library> element

Is there any example of creating shared library referenced here

However, some packages reside in their own libraries. If your application uses code from any of these packag开发者_运维知识库es, it must explicitly asked to be linked against them. The manifest must contain a separate element to name each of the libraries. (The library name can be found in the documentation for the package.)

And here

Specifies a shared library that the application must be linked against. This element tells the system to include the library's code in the class loader for the package.

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here is an example http://developer.android.com/resources/tutorials/views/hello-mapview.html this is the only thing I know of that uses it.