Android : How to download images from json response to sd card?

I know how to download images to sd card from server. But I want to download images from my json file which is present in internal memory(image url are present) and need to store in sd card. here I'm going to use ID as image name. Please help on it.

Sample JSON

{
    "ImageData": [{
        "ImageId": "12",
        "ImageName": "Img1",
        "ImageDesc": "Img1 Img1Img1 ",
        "ImageUrl": "img_url/pro1.jpg"
    },
    {
        "ImageId": "13",
        "ImageName": "Img13",
        "ImageDesc": "Img13 Img13 Img13Img13 ",
        "ImageUrl": "img_url/pro2.jpg"
    },
    {
        "ImageId": "14",
        "ImageName": "Img14",
        "ImageDesc": "Img14 Img14 Img14 Img14 Img14 ",
        "ImageUrl": "img_url/pro3.jpg.jpg"
    },
    ]
}