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It's OK. Library project and samples were prepared in Eclipse 3.x. If I understand right, you use Eclipse 4.x (Juno). There is some incompatibility in projects for different Eclipse versions. You need to remove .settings folder from OpenCV library project directory [OpenCV4Adnroid_sdk]/sdk/java/.settings and from samples? then import it to Eclipse again and fix project properties (Project right mouse button menu -> Android tools -> Fix project properties).