1 下载OpenCv
在opencv官网下载响应的版本,我以 4.7.0版本为例,选择响应版本下载并解压
2 新建AndroidC++项目
image.png
2.1 导入opencv
image.png
找到解压的文件下sdk目录
image.png
重命名Moudule name 将sdk 重命名opencv并点击Finish
image.png
如果报错If you've specified the package attribute in the source AndroidManifest.xml
image.png
只需要在opencv目录下的build.gradle中 配置
namespace 'org.opencv'
image.png
2.2 配置C++相关
1 在gradle.properties文件中配置opencvsdk 绝对路径
我的电脑是winds,使用的绝对路径，根据实际情况替换你项目的绝对路径
opencvsdk=D\:\\project\\android\\opencv\\OpenCvTest
2 在setting.properties文件中配置opencv的projectDir
project(':opencv').projectDir = new File(opencvsdk + '/opencv')
image.png
3 在配置app下的build.gradle文件
externalNativeBuild {
cmake {
cppFlags "-frtti -fexceptions"
abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
arguments "-DOpenCV_DIR=" + opencvsdk + "/opencv/native"
}
}
image.png
导入opencvModule
implementation project(path: ':opencv')
image.png
4 配置 cmake文件
include_directories(${OpenCV_DIR}/jni/include)
add_library( lib_opencv SHARED IMPORTED )
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${OpenCV_DIR}/libs/${ANDROID_ABI}/libopencv_java4.so)
lib_opencv
image.png
3 代码测试
private lateinit var binding: ActivityMainBinding
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
binding = ActivityMainBinding.inflate(layoutInflater)
setContentView(binding.root)
binding.sampleText.text = stringFromJNI()
binding.btnConvert.setOnClickListener {
val bitmap = BitmapFactory.decodeResource(resources, R.drawable.gril)
val mat = Mat()
Utils.bitmapToMat(bitmap, mat)
processImage(mat.nativeObjAddr)
// 将处理后的图像显示在ImageView中
val resultBitmap = Bitmap.createBitmap(mat.cols(), mat.rows(), Bitmap.Config.ARGB_8888)
Utils.matToBitmap(mat, resultBitmap)
binding.ivGirl.setImageBitmap(resultBitmap)
}
binding.btnConvert2.setOnClickListener {
val bitmap = BitmapFactory.decodeResource(resources, R.drawable.gril)
val matSrc = Mat()
val matDst = Mat()
Utils.bitmapToMat(bitmap, matSrc)
processImage2(matSrc.nativeObjAddr,matDst.nativeObjAddr)
// 将处理后的图像显示在ImageView中
val resultBitmap = Bitmap.createBitmap(matDst.cols(), matDst.rows(), Bitmap.Config.ARGB_8888)
Utils.matToBitmap(matDst, resultBitmap)
binding.ivGirl2.setImageBitmap(resultBitmap)
}
}
external fun stringFromJNI(): String
external fun processImage(nativeObjAddr: Long)
external fun processImage2(nativeObjAddr: Long, dstObjAddr: Long)
companion object {
init {
System.loadLibrary("open")
}
}
#include <jni.h>
#include <string>
#include <opencv2/opencv.hpp>
extern "C" JNIEXPORT jstring JNICALL
Java_com_mind_open_MainActivity_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());
}
extern "C"
JNIEXPORT void JNICALL
Java_com_mind_open_MainActivity_processImage(JNIEnv *env, jobject thiz, jlong matAddr) {
cv::Mat &image = *(cv::Mat *) matAddr;
// 灰度处理
cv::cvtColor(image, image, cv::COLOR_RGB2GRAY);
}
extern "C"
JNIEXPORT void JNICALL
Java_com_mind_open_MainActivity_processImage2(JNIEnv *env, jobject thiz, jlong matAddr,
jlong matDst) {
cv::Mat &image = *(cv::Mat *) matAddr;
cv::Mat &dst = *(cv::Mat *) matDst;
// 灰度处理
cv::cvtColor(image, dst, cv::COLOR_RGB2GRAY);
}
4 可能遇到的问题
注意java版本的问题
