android jni保存图片

目录

CMakeLists.txt

获取保存目录：

[c++ jni 保存图片 到程序目录：](#c++ jni 保存图片 到程序目录：)

[pull 单个文件：](#pull 单个文件：)

pull目录：

---

测试保存Ok：

CMakeLists.txt

project(mediapipehand)

cmake_minimum_required(VERSION 3.10)

# 设置OpenCV路径 - 指向D盘根目录下的opencv目录
set(OpenCV_DIR B:/soft/android/opencv-4.12.0-android-sdk/OpenCV-android-sdk/sdk/native/jni)
find_package(OpenCV REQUIRED core imgproc imgcodecs)

# 设置ncnn路径 - 指向D盘根目录下的ncnn目录
set(ncnn_DIR ${CMAKE_SOURCE_DIR}/ncnn-20221128-android-vulkan/${ANDROID_ABI}/lib/cmake/ncnn)
find_package(ncnn REQUIRED)

add_library(mediapipehand SHARED mediapipehand.cpp hand.cpp landmark.cpp ndkcamera.cpp cls_mobilenet.cpp)

target_link_libraries(mediapipehand ncnn ${OpenCV_LIBS} camera2ndk mediandk)

获取保存目录：

        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.Q) {
            var aaa=1
        } else {
            // Android 9 及以下
            var aaa=2
        }

        val dir = getExternalFilesDir(Environment.DIRECTORY_PICTURES) // app 专属目录
        val file = File(dir, "hand_crop.jpg")
        val path = file.getAbsolutePath()

c++ jni 保存图片 到程序目录：

文件管理器可以看到

#include <string>
#include <chrono>
#include <iomanip>
#include <sstream>



        // 裁剪手部区域
        cv::Mat hand_crop = rgb(bbox).clone();

        cv::Mat img_rgb;
        // 转换BGR到RGB
        cv::cvtColor(hand_crop, img_rgb, cv::COLOR_BGR2RGB);

        auto now = std::chrono::system_clock::now();
        auto now_time = std::chrono::system_clock::to_time_t(now);
        std::stringstream time_ss;
        time_ss << std::put_time(std::localtime(&now_time), "m%d_%H%M");

        std::string temp_path = "/storage/emulated/0/Android/data/com.example.classroom/files/Pictures/hand_" +
                    time_ss.str() + "_" + std::to_string(img_num) + ".jpg";

        img_num++;

        if (cv::imwrite(temp_path, img_rgb)) {
            __android_log_print(ANDROID_LOG_INFO, "FileSave", "Saved to: %s", temp_path.c_str());
        }
		

pull 单个文件：

adb pull /storage/emulated/0/Android/data/com.example.classroom/files/Pictures/hand_crop.jpg .

pull目录：

adb pull /storage/emulated/0/Android/data/com.example.classroom/files/Pictures/ .