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copied!<p><strong>Note</strong>: This answer is basically obsolete now that one can create .aar libraries with resources. It still works, though, and there may be times when the portability of a .jar is desirable, so I'm leaving it here.</p> <p>Blumer's answer is a good one, and you should definitely look into Android's idea of library projects. However, there is another alternative. If you have a module that contains only Java code, but no resources of any kind (images, layouts, etc.), you can compile it to a .jar file separately and use the resulting .jar in multiple application projects. It works like this:</p> <ul> <li>Create a new Java project in Eclipse (not an Android project) and move the source code of your module there.</li> <li>If your module references any classes from the SDK, you'll need to add the Android SDK .jar to the project's classpath (Project > Properties > Java Build Path > Libraries > Add JAR).</li> <li>When your module is ready to use, bundle up its .class files into a .jar. You can do this manually, or you can look around to figure out how to get Eclipse to do it for you.</li> <li>Copy your module .jar file into the "libs" directory of your app's main project.</li> <li>Add the module .jar to the project's classpath (again, Project > Properties > Java Build Path > Libraries > Add JAR).</li> </ul> <p>Now you should be able to build multiple apps using the same .jar, while maintaining only one copy of the module's source code.</p> <p>Depending on your particular situation, this may or may not work any better for you than the standard Android library mechanism. But it's worth considering as an alternative.</p>

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