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The solution is to use FLASH_MODE_TORCH and not FLASH_MODE_ON

mCamera.set(Highgui.CV_CAP_PROP_ANDROID_FLASH_MODE, Highhui.CV_CAP_ANDROID_FLASH_MODE_TORCH);

The solution is to use FLASH_MODE_TORCH FLASH_MODE_TORCH and not FLASH_MODE_ON

mCamera.set(Highgui.CV_CAP_PROP_ANDROID_FLASH_MODE, Highhui.CV_CAP_ANDROID_FLASH_MODE_TORCH);
Highhui.CV_CAP_ANDROID_FLASH_MODE_TORCH);