Load image on Android and process it using halide

I am going to load an image by provided file_path and then downsample it then save it. The whole thing should be done on android device.

I am in trouble to load an image on device and convert to halide::buffer.

Halide::Tools::load_image didn't work on android if I use it like

JNIEXPORT bool JNICALL Java_com_example_boxdownsample_MainActivity_downsample(
        JNIEnv *env, jobject obj, jstring file_path) { ...
    const char *path = env->GetStringUTFChars(file_path, NULL);
    std::string work_path = path;
    LOGD("the path is:%s", path);
    std::string input_file = work_path + "input.png";
    std::string output_file = work_path + "output.png";

    Halide::Buffer<uint16_t> input = Halide::Tools::load_image(input_file);//load_image didn't work ....
    int ret = box_downsample_halide(input, downsample_factor, output_u16); //box_downsample_halide is a static lib generated by halide generator
    ... } }

So, am I use it wrong? or I should load it use java(that would be bitmap format) then encode it to halide::buffer, but this seems a bit hard and indirect.

Is there any easier way to do it?

Thanks!

UPDATE: I found a way, in case who also need this, please go to my github