126 lines
4.0 KiB
Markdown
126 lines
4.0 KiB
Markdown
# 手动编译OpenCV 和OpenCV_contrib android版本
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## 安装编译工具
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### 基础工具安装
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```sh
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sudo apt install build-essential python wget git python-pip
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pip install ninja
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sudo apt install ant libcurl4-gnutls-dev zlib1g-dev
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```
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### cmake 安装
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```sh
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wget --no-check-certificate https://github.com/Kitware/CMake/releases/download/v3.22.1/cmake-3.22.1.tar.gz
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tar -zxvf cmake-3.22.1.tar.gz
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cd cmake-3.22.1
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./bootstrap --system-curl
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make -j8 # 8为CPU核心数
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sudo make install
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cmake --version #查看是否正常安装cmake
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```
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### [Ccache ](https://ccache.dev/)安装
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```sh
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wget --no-check-certificate https://github.com/ccache/ccache/releases/download/v3.7.12/ccache-3.7.12.tar.gz
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tar -zxvf ccache-3.7.12.tar.gz
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cd ccache-3.7.12
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./configure
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make -j8 # 8为CPU核心数
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sudo make install
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```
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### Android sdk ndk Java jdk安装
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* 下载SDK wget http://dl.google.com/android/android-sdk_r24.4.1-linux.tgz
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* [NDK](https://github.com/android/ndk/wiki/Unsupported-Downloads) [JDK](https://www.oracle.com/java/technologies/downloads/)文件并解压文件,修改.bashrc文件，添加如下内容
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```sh
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export ANDROID_SDK=/home/ehigh/android_sdk #sdk路径
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export PATH=$ANDROID_SDK/tools:$PATH
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export ANDROID_NDK=/home/ehigh/android_ndk #ndk路径
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export PATH=${PATH}:$ANDROID_NDK
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export JAVA_HOME=/home/ehigh/java8 # jdk路径
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export JRE_HOME=${JAVA_HOME}/jre
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export CLASSPATH=.:${JAVA_HOME}/lib:${JRE_HOME}/lib
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export PATH=${JAVA_HOME}/bin:$PATH
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# 保存后执行 source .bashrc 使修改生效
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android -h # 验证Android sdk 版本
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```
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* 安装需要的组件版本
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```sh
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android update sdk -u --all --filter 29,62
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```
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## opencv 代码下载&& 配置
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* 代码下载
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```sh
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mkdir android_opencv
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cd android_opencv
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git clone https://github.com/opencv/opencv_contrib.git
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git clone https://github.com/opencv/opencv.git
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```
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* NDK配置修改
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修改文件 /opencv/platforms/android/ndk-22.config.py ,修改GRADLE版本为Android项目的版本
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```sh
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ABIs = [
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ABI("1", "arm64-v8a", None, cmake_vars=dict(ANDROID_GRADLE_PLUGIN_VERSION='4.2.0', GRADLE_VERSION='6.7.1', KOTLIN_PLUGIN_VERSION='1.5.0')),
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]
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```
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* 编译配置修改
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修改文件/opencv/platforms/android/build_sdk.py,修改cmake_var 为如下内容
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```python
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def build_library(self, abi, do_install):
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cmd = [self.cmake_path, "-GNinja"]
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cmake_vars = dict(
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CMAKE_TOOLCHAIN_FILE=self.get_toolchain_file(),
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INSTALL_CREATE_DISTRIB="ON",
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WITH_OPENCL="ON",
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BUILD_KOTLIN_EXTENSIONS="ON",
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WITH_IPP=("ON" if abi.haveIPP() else "OFF"),
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WITH_TBB="ON",
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OPENCV_ENABLE_NONFREE="ON", # 添加这一行,添加编译opencv_contrib
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BUILD_EXAMPLES="OFF",
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BUILD_TESTS="OFF",
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BUILD_PERF_TESTS="OFF",
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BUILD_DOCS="OFF",
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BUILD_ANDROID_EXAMPLES="ON",
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INSTALL_ANDROID_EXAMPLES="OFF",
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)
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```
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## 编译代码
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```sh
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cd android_opencv
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mkdir opencv_build
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cd opencv_build
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python ../opencv/platforms/android/build_sdk.py --extra_modules_path=../opencv_contrib/modules/ --config /home/yewuya/opencv/platforms/android/ndk-22.config.py # ndk-17要与下载的ndk版本对应
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```
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* 编译完成后opencv_build 文件夹下的OpenCV-android-sdk 即为编译出来的结果
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## Android 项目导入opencv sdk
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* 修改sdk build.gradle 文件中的compileSdkVersion 30 targetSdkVersion 30为Android项目相同的版本
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* 注释 path (project.projectDir.toString() + '/libcxx_helper/CMakeLists.txt')
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* 添加jnilib 在app/路径下创建lib文件夹并将sdk\native\libs\arm64-v8a 复制到lib 路径下
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```java
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sourceSets {
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main {
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jni.srcDirs=[]
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jniLibs.srcDirs=['libs'] //jnilib 路径
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}
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}
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```
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* 在项目目录下创建文件夹custom_opencv并将sdk/java 和build.gradle复制到文件夹下
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* setting.gradle 添加 include ':custom_opencv'
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* app build.gradle 添加依赖
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```java
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implementation project(path: ':custom_opencv')
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```
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