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This native implemenation includes java api for android. But It also broken, you can see explanation here - https://groups.google.com/forum/#!topic/discuss-webrtc/BUPq2UxIyq8.
I've implementing RTCPeerConnection api for java. I
I would have done this JNI stuff but I hadn't been stuck with one problem. I couldn't glue JNI and multi-threading native client. I've received JVM errors.