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answered 2015-01-11 09:28:23 -0600
Once you extraced the OpenCV Android SDK, you will find the source code here: OpenCV-2.4.8-android-sdk ▸ sdk ▸ native ▸ jni ▸ include ▸ opencv2
For mat.hpp you will find it in the 'core' folder from opencv2. Cheers!