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++.pngimage.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
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