Android studio配置Opencv开发环境

前言
最近研究在Android移动设备上进行OpenCV开发， 遇到很多坑，终于成功搭建环境，现在跟大家分享一下成果，希望为大家减少不必要的困惑和麻烦。
开发工具配置
Android studio 版本2.3.3
下载地址：http://www.android-studio.org/
OpenCV 3.3
下载地址:https://opencv.org/opencv-3-3.html
开发opencv需要Android NDK 大家可以自行下载NDK库并配置好环境变量

新建一个studio项目 注意一定要勾选支持C++

勾选支持C++.png

image.png

配置CMakeLists.txt文件 添加文件中缺少的代码 切勿全部复制粘贴

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html

# Sets the minimum version of CMake required to build the native library.

cmake_minimum_required(VERSION 3.4.1)


#工程路径
#OpenCV-android-sdk路径
#修改为你的OpenCV-SDK目录
set(pathToOpenCv /Users/hzzj/Desktop/SDL/Opencv/OpenCV-android-sdk)

#CMake版本信息
cmake_minimum_required(VERSION 3.4.1)
#支持-std=gnu++11
set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")

#配置加载native依赖->引入OpenCV头文件
include_directories(${pathToOpenCv}/sdk/native/jni/include)

#动态方式加载
#引入libopencv_java3.so文件
add_library( opencv_java3
             SHARED
             IMPORTED)
set_target_properties(opencv_java3
                        PROPERTIES IMPORTED_LOCATION
                        ../../../../src/main/jniLibs/armeabi/libopencv_java3.so)


# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
             native-lib

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             src/main/cpp/native-lib.cpp )

# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.

find_library( # Sets the name of the path variable.
              log-lib

              # Specifies the name of the NDK library that
              # you want CMake to locate.
              log )

# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
                       native-lib opencv_java3 jnigraphics

                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib} )

配置build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "27.0.1"
    defaultConfig {
        applicationId "com.hzzj.opencv.demo"
        minSdkVersion 15
        targetSdkVersion 26
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
        externalNativeBuild {
            cmake {
                cppFlags "-frtti -fexceptions"
                abiFilters 'armeabi' //添加平台架构类型

            }
        }
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:26.+'
    compile 'com.android.support.constraint:constraint-layout:1.0.2'
    testCompile 'junit:junit:4.12'
}

配置完成后开始我们项目之旅项目源码稍后提交