title: add opencv in cmakelists.txt android
body: <p>I am using native code and open cv in android studio project by using ndk-build but i want to use cmake. please tell me how to set these things in cmakelists.txt file.
  this is my Android.mk file</p>
  
  <pre><code>LOCAL_PATH := $(call my-dir)
  include $(CLEAR_VARS)
  
  OpenCV_INSTALL_MODULES:=on
  OPENCV_CAMERA_MODULES:=off
  OPENCV_LIB_TYPE:=STATIC
  
  ifeq ("$(wildcard $(OPENCV_MK_PATH))","")
  include D:/OpenCV-3.1.0-android-sdk/sdk/native/jni/OpenCV.mk
  else
  include $(OPENCV_MK_PATH)
  endif
  
  LOCAL_MODULE := module_name
  
  LOCAL_CFLAGS := -DANDROID_NDK \
                  -DDISABLE_IMPORTGL
  
  LOCAL_SRC_FILES := src/main/cpp/test.cpp
  
  LOCAL_LDLIBS    += -lm -llog -ljnigraphics
  include $(BUILD_SHARED_LIBRARY)
  </code></pre>
  
  <p>how to set these things in cmake</p>