Need Code: Android OpenCV camera2 capture application

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Hello all.

I need a simple reference to a code that opens the camera device using API android.hardware.camera2 , and pass the frame to a Mat object for OPENCV processing.

All the code I manage to find use athe andorid.hardware.camera API, and I get low frame rates even when not doing any processing, just in preview mode. If anyone have an application with high speed frame rate camera output with Mat for openCV work, please share with me..

Thanks!