Android studio中使用OpenCV C++库

程序员正茂2026-07-29 10:22

1.下载opencv-mobile4.6.0 （Release v16）

2.解压放入app/src/main/cpp/目录下

3.修改CMakeList.txt

在add_library主模块之后（放之前会报错），加入如下代码

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set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

set(OpenCV_DIR ${CMAKE_SOURCE_DIR}/opencv-mobile-4.6.0-android/sdk/native/jni)
find_package(OpenCV REQUIRED)

find_package(OpenMP REQUIRED)
if(OpenMP_FOUND)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${OpenMP_C_FLAGS} -static-openmp")
    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${OpenMP_CXX_FLAGS} -static-openmp")
endif()

target_link_libraries中加入

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${OpenCV_LIBS}
OpenMP::OpenMP_CXX

4.在app/build.gradle中加入

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cmake {
        cppFlags "-std=c++17 -fopenmp -static-openmp"
        abiFilters 'arm64-v8a'
      }

5.测试画圆（可在子线程中使用）

cpp 复制代码

#include <opencv2/core/core.hpp>
#include <opencv2/imgproc/imgproc.hpp>

...
cv::Mat mat(player.codecCtx->height,player.codecCtx->width,CV_8UC4,player.buffer);
cv::circle(mat, cv::Point(30, 250), 20,cv::Scalar(127, 0, 127), 2);

显示到界面中（片断）

cpp 复制代码

ANativeWindow_Buffer windowBuffer;
				ARect dirtyRect;
				// 调用回调函数
				if (ANativeWindow_lock(player.nativeWindow, &windowBuffer, &dirtyRect) != 0)
				{
					return;
				}

				// 逐行拷贝：处理窗口stride与图像stride不一致的情况
				uint8_t* dst = static_cast<uint8_t*>(windowBuffer.bits);
				int dstStride = windowBuffer.stride * 4; // 每行字节数
				int srcStride = mat.step[0];             // mat每行字节

				for (int y = 0; y < player.codecCtx->height; y++)
				{
					const uint8_t* srcRow = mat.ptr<uint8_t>(y);
					uint8_t* dstRow = dst + y * dstStride;
					memcpy(dstRow, srcRow, srcStride);
				}

				// 解锁并提交画面显示
				ANativeWindow_unlockAndPost(player.nativeWindow);