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    <blockquote> <p>behind the scenes, Eclipse creates and references a jar from the referenced library project.</p> </blockquote> <p>This is not quite accurate. Library project is referenced as a raw project dependency (source-based mechanism), not as a compiled jar dependency (compiled-code based library mechanism). Currently Android SDK does not support exporting a library project to a self-contained JAR file. The library project must always be compiled/built indirectly, by referencing the library in the dependent application and building that application. When build dependent project, the compiled source and raw resources that need to be filtered/merged from Library project are copied and properly included in the final apk file. Note that Android team had started revamping the whole Library Project design (move it from ource-based mechanism to compiled-code based library mechanism) since r14, as mentioned in <a href="http://android-developers.blogspot.co.nz/2011/10/changes-to-library-projects-in-android.html" rel="nofollow">this earlier blog post</a>.</p> <blockquote> <p>What are some of the best practices for sharing and extending common classes among Android app targets?</p> </blockquote> <p>The solution given by Android is <a href="http://developer.android.com/guide/developing/projects/index.html#LibraryProjects" rel="nofollow">Library Project</a>.<br> The solution given by Java is <a href="http://docs.oracle.com/javase/tutorial/java/IandI/subclasses.html" rel="nofollow">Inheritance</a> and <a href="http://docs.oracle.com/javase/tutorial/java/IandI/polymorphism.html" rel="nofollow">Polymorphism</a>.<br> Come together, the best practice IMO is the second option you mentioned in the question:</p> <blockquote> <p>2.Extend the particular Core class in a target project and override the base (Core) class functions as needed. Then keep a reference to the base-class object in the Core library and instantiate it with an extended class object (from Android library project - How to overwrite a class?)</p> </blockquote> <p>From my personal experience, I always use Android Library Project (Sometimes with Regular Java Project, for implementing/building common-lib.jar that contains only POJO) manage common code, for instance SuperActivity or SuperService, and extends/implements proper classes/interfaces in the dependent project for Polymorphism.</p>
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