Using an Android library project Activity within another project

I believe you must include the <activity> in your own AndroidManifest.xml — I don’t think it gets picked up from a library. I don’t have my reference for that handy.

Update: It’s official solution. From the doc:

Declaring library components in the manifest file

In the manifest file of the application project, you must add
declarations of all components that the application will use that are
imported from a library project. For example, you must declare any
<activity>, <service>, <receiver>, <provider>, and so on, as well as
<permission>, <uses-library>, and similar elements.

Declarations should reference the library components by their
fully-qualified package names, where appropriate.

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