opencv移植到android免OpenCV Manager

2018年11月13日 2018年11月15日

qihong lu

第一步：在官网下载opencv for android的sdk
官网：https://opencv.org/releases.html

第二步：将opencv导入安卓项目里面
Android Studio中创建一个Android项目，创建好之后，选择File->New->Import Module
然后选择 opencv文件夹里面的SDK/JAVA
这样就导入进去了

第三步：添加依赖
File/Project structure

第四步：免OpenCV Manager

在自己app的文件夹里面app/src/mian下面创建一个jniLibs的文件夹
然后将下载下了的opencv库文件夹里面的opencv-android\OpenCV-android-sdk\sdk\native\libs

第五步：处理opencv库和安卓版本问题
打开OpenCVLibrary*的build.gradle将

compileSdkVersion * 
buildToolsVersion "*.*.*" 
minSdkVersion * 
targetSdkVersion *

compileSdkVersion *

buildToolsVersion "*.*.*"

minSdkVersion *

targetSdkVersion *

改成与app 的 build.gradle 的一致

第6步：打开app目录下的 CMakeLists.txt文件改成如下

# 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)
#
set(CMAKE_VERBOSE_MAKEFILE on)
set(libs "${CMAKE_SOURCE_DIR}/src/main/jniLibs")
include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/include)
add_library(libopencv_java3 SHARED IMPORTED )
set_target_properties(libopencv_java3 PROPERTIES
        IMPORTED_LOCATION "${libs}/${ANDROID_ABI}/libopencv_java3.so")
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -fexceptions -frtti")
#
# 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.
#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})
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
        libopencv_java3

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

# 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)

set(CMAKE_VERBOSE_MAKEFILE on)

set(libs "${CMAKE_SOURCE_DIR}/src/main/jniLibs")

include_directories(${CMAKE_SOURCE_DIR}/src/main/cpp/include)

add_library(libopencv_java3 SHARED IMPORTED )

set_target_properties(libopencv_java3 PROPERTIES

IMPORTED_LOCATION "${libs}/${ANDROID_ABI}/libopencv_java3.so")

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11 -fexceptions -frtti")

# 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.

#set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR}/src/main/jniLibs/${ANDROID_ABI})

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

libopencv_java3

# Links the target library to the log library

# included in the NDK.

${log-lib})

第7步： 打开app目录下的 build.gradle 文件改成如下

android {
    defaultConfig {
        externalNativeBuild {
            cmake {
                arguments "-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=clang","-DCMAKE_BUILD_TYPE=Release"
                //abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"
                cppFlags "-std=c++11 -frtti -fexceptions"
            }
        }
        ndk{
            abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"
        }


    }
    externalNativeBuild {
        cmake {
            path "CMakeLists.txt"
        }
    }
}

dependencies {
    implementation project(':openCVLibrary343')
}

android {

defaultConfig {

externalNativeBuild {

cmake {

arguments "-DANDROID_ARM_NEON=TRUE", "-DANDROID_TOOLCHAIN=clang","-DCMAKE_BUILD_TYPE=Release"

//abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"

cppFlags "-std=c++11 -frtti -fexceptions"

}

ndk{

abiFilters "armeabi-v7a","arm64-v8a","x86","x86_64"//,"armeabi","mips","mips64"

}

externalNativeBuild {

cmake {

path "CMakeLists.txt"

}

dependencies {

implementation project(':openCVLibrary343')

}

第8步：在调用opencv库的那个活动里面添加如下代码

public class MainActivity extends AppCompatActivity {

    // Used to load the 'native-lib' library on application startup.
    static {
        System.loadLibrary("opencv_java3");
        System.loadLibrary("native-lib");
    }
}