android studio NDK , about cv:: method

Issue

First, I'm sorry I can not English well. I gave up googling, I was exhausted. Please give me tips.

I just finished NDK's h, cpp, Android.mk and Applicaiton.mk files and then I ran my application. It works well. But by adding one line Mat mat in cpp file, I got the error right away about cv::Mat~~

I immediately modified Mat to cv::Mat but I got other errors about cv::~~. I think that I have to write using namespace cv;. But this is Android Studio not C++. What should I do??

Android.mk

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

OPENCV_LIB_TYPE:=STATIC
LOCAL_C_INCLUDES := C:\opencv-3.2.0-android-sdk\OpenCV-android-sdk\sdk\native\jni\include
LOCAL_MODULE := myCanny
LOCAL_SRC_FILES := myCanny.cpp

include $(BUILD_SHARED_LIBRARY)

Application.mk

APP_ABI := all
APP_MODULED := myCanny
APP_STL := gnustl_shared
APP_CPPFLAGS += -std=c++11

Solution

why don't you just use the java port of openCV? https://opencv-java-tutorials.readthedocs.io/en/latest/

If there is a reason you are using c++ code for image processing, let's talk. somenamespace::function() is the same if you set using namespace somenamespace and just call function(), so it's not necessary. please share your cpp code to get more detais. maybe, you've forgot to #include "opencv2/imgcodecs.hpp" ?

Answered By - Va Fu