Android and OpenCV 3.0

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I'm trying to build an app with native C++ code using OpenCV 3.0 and the Android NDK. As there is no Android SDK yet I'm wondering if there's already the possibility to build it from source? So far I managed to compile OpenCV 3.0 and build the android stuff under platforms/android. However I'm missing the Java classes now (BaseLoaderCallback for example).

Has anybody arrived doing this yet?