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I guess this says it all :

At this point you should be able to build and run the samples. Keep in mind, that face-detection and Tutorial 2 - Mixed Processing include some native code and require Android NDK and NDK/CDT plugin for Eclipse to build working applications. If you haven’t installed these tools, see the corresponding section of Introduction into Android Development.

Was found in the following guide. So follow the steps mentioned there in order to get the samples to work:

http://docs.opencv.org/doc/tutorials/introduction/android_binary_package/O4A_SDK.html