Load OPENCV into android application

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http://stackoverflow.com – I am creating an android application and i am using OPENCV for face detection.I have created a new android project using eclipse and now i have to add the OPENCV Face detection(a separate project in eclipse) into the newly created project. I have to call the OPENCV's onCreate method from the new android project's Activity class. I have googled and i am not clear in doing this.Also to run OPENCV code we need to install OPENCV Manager in the device/emulator. Other way is to include the libraries in the newly created android project which will increase the app size.Which method is better to use? (HowTos)