在Android Studio中对开发环境进行配置

「爱情、让人受尽委屈。」 2023-06-21 03:52 11阅读 0赞

#  #

# 在Android Studio中对开发环境进行配置 #

### 软件版本 ###

Android Studio 3.5.2  
android-ndk-r20b  
opencv-3.2.0-android-sdk

### 新建工程 ###

工程类型选择Native C++，C++ Standard选择 C++11

### 新建完工程目录 ###

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xyaWNp_size_16_color_FFFFFF_t_70]

### 导入依赖lib ###

在Main目录下新建jniLibs文件夹，并将 opencv-3.2.0-android-sdk\\OpenCV-android-sdk\\sdk\\native\\libs 文件夹下的包复制到 jniLibs中

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L0xyaWNp_size_16_color_FFFFFF_t_70 1]

### 修改CMakeLists.txt文件 ###

# 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.
    
    set(pathToOpenCv F:/opencv-3.2.0-android-sdk/OpenCV-android-sdk)#设置OpenCv的路径变量
    
    
    #支持-std=gnu++11
    set(CMAKE_VERBOSE_MAKEFILE on)
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
    #配置加载native依赖
    include_directories(${pathToOpenCv}/sdk/native/jni/include)
    
    set(CURRENT_DIR ${CMAKE_SOURCE_DIR})
    # 在Gradle Console输出信息
    # CMAKE_SOURCE_DIR:
    message("CURRENT_DIR:" ${CMAKE_SOURCE_DIR})
    
    add_library(lib_opencv STATIC IMPORTED ) #表示创建一个导入库，静态方式
    
    # 设置工程的App路径
    set(pathToProject H:/Project/OpenCvAndroid/app)
    set(libs ${pathToProject}/src/main/jniLibs)
    
    
    set_target_properties(lib_opencv
    PROPERTIES
    IMPORTED_LOCATION ${libs}/${ANDROID_ABI}/libopencv_java3.so
    )
    include_directories(${pathToProject}/src/main/cpp/includes)
    cmake_minimum_required(VERSION 3.4.1)
    
    
    add_library( # Sets the name of the library.
    native-lib
    SHARED
    native-lib.cpp)
    
    
    
    find_library(
    log-lib
    log)
    
    
    
    target_link_libraries(
    native-lib
    
    ${log-lib} android -ljnigraphics lib_opencv)

### 修改Module中的build.gradle，添加sourceSets ###

sourceSets {
    main {
    jniLibs.srcDirs = ['H:\\Project\\OpenCvAndroid\\app\\src\\main\\jniLibs']
    }
    }

### 在native-lib.cpp中添加include ###

#include <iostream>
    #include <sstream>
    #include <string>
    #include <stdlib.h>
    #include <cstdio>
    #include <stdio.h>
    #include <cstdlib>
    #include <opencv2/core/core.hpp>
    #include <opencv2/highgui/highgui.hpp>
    #include <opencv2/ml/ml.hpp>

正常编译则表示OpenCv引入成功

## 问题： ##

### 问题一： ###

在使用OpenCv2.4时报出错误，这是因为OpenCV引用了GNU的东西。

fatal error: 'ext/atomicity.h' file not found
    #include <ext/atomicity.h>
    ^~~~~~~~~~~~~~~~~
    1 error generated.
    ninja: build stopped: subcommand failed.

需要在Module中的build.gradle的cmake中添加 `arguments "-DANDROID_STL=gnustl_static"` 而NDK18之后不支持`DANDROID_STL`参数，需要将NDK版本修改为17及17以下

externalNativeBuild {
    cmake {
    cppFlags "-std=c++11"
    arguments "-DANDROID_STL=gnustl_static"
    }
    }

### 问题二： ###

Error while executing process =\ninja.exe with arguments {-C .cxx\cmake\debug\arm64-v8a native-lib}
    ninja: Entering directory `=\.cxx\cmake\debug\arm64-v8a'
    
    ninja: error: '==/libopencv_java3.so', needed by 'cmake/debug/obj/arm64-v8a/libnative-lib.so', missing and no known rule to make it

需要在CmakeLists.txt文件中添加绝对路径

set(pathToProject H:/Project/MyApplication/app)
    set(libs ${pathToProject}/src/main/jniLibs)
    
    
    set_target_properties(lib_opencv
    PROPERTIES
    IMPORTED_LOCATION ${libs}/${ANDROID_ABI}/libopencv_java.so
    )

在build.gradle中添加sourceset

sourceSets {
    main {
    jniLibs.srcDirs = ['H:\\Project\\MyApplication\\app\\src\\main\\jniLibs']
    }
    }

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