How to use a class in multiple projects?

Question

Android

Two projects have similar functionality, it makes sense for the convenience of development to make a common class that would be used in both applications.
I tried to import a class from a different namespace in Eclipse, but when one application starts, 1) the second is automatically installed and 2) a NoClassDefFoundError is thrown.
Question: how to properly organize the project hierarchy and set up the IDE?

Answer 1

Move the class to the android library project and connect it to the necessary applications

Answer 2

jar
?