Question

我正在获取JSON数据。下载时如何使用JSONArray＆amp;在GridView中显示图像。我怎么能做到这一点？我指的是Download and Display Image in Android GridView。它是JSONObject。

这是我的代码。

private void parseResult(String result) {
    try {
        JSONObject response = new JSONObject(result);
        JSONArray posts = response.optJSONArray("posts");
        GridItem item;
        for (int i = 0; i < posts.length(); i++) {
            JSONObject post = posts.optJSONObject(i);
            item = new GridItem();
            JSONArray img = post.getJSONArray("img");
            if (null != attachments && attachments.length() > 0) {
                JSONObject attachment = attachments.getJSONObject(0);
                if (img!= null)
                    item.setImage(img.getString("url"));
            }
            mGridData.add(item);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }
}

这里是推荐代码，

{
  "status": "ok",
  "count": 45,
  "count_total": 397,
  "pages": 9,
  "posts": [
    {
      "id": 12378,
      "url": "http://stacktips.com/tutorials/android/speech-to-text-in-android",
    },
    {...},
    {...}
  ]
}

这是我的JSON，

[
  {
    "id": "95",
    "name": "Cherry",
    "menu": [
      {
        "menu_id": "18",
        "img": "925dd3ad6d50fa5686a82af26515be5d.jpg"
      }
    ]
  },
  {...},
  {...}
]

Answer 1

试试这段代码：

参考代码：

try{
    JSONObject  object = new JSONObject (result);
    JSONArray jsonArray = object.getJSONArray("posts");
    for(int i=0;i<jsonArray.length();i++){
         JSONObject object = jsonArray.getJSONObject(i);
         String id = object.getString("id");
         String img_url = object.getString("url");

         item = new GridItem();
          if (img_url!= null)
                   item.setImage(img_url);
            mGridData.add(item);
        }
     }
     catch (JSONException e){
           e.printStackTrace();
    }

第二个JSON

 try{
    JSONArray jsonArray = new JSONArray(result);
    for(int i=0;i<jsonArray.length();i++){
         JSONObject object = jsonArray.getJSONObject(i);
         String id = object.getString("id");
         String name = object.getString("name");

         JSONArray menu = object.getJSONArray("menu");
         for(int j=0;j<menu.length();j++){
             JSONObject menu_object = menu.getJSONObject(j);
             String menu_id = menu_object.getString("menu_id");
             String image_url = menu_object.getString("img");
             item = new GridItem();
              if (image_url!= null)
                       item.setImage(image_url);
                mGridData.add(item);
            }
        }
     }
     catch (JSONException e){
           e.printStackTrace();
}

Answer 2

以下是您的解决方案：

    try {
        JSONObject response = new JSONObject(result);

        JSONArray menu = response.optJSONArray("menu");

        GridItem item;

        for (int i = 0; i < menu.length(); i++) {

            JSONObject post = menu.optJSONObject(i);

            String menu_id=post.getString("menu_id");

            String img=post.getString("img");


            item = new GridItem();

            item.setImage(img);


            mGridData.add(item);

        }
    } 
}

Answer 3

请使用google-gson图书馆link

示例JSON字符串

class Albums {
    public String title;
    public String message;
    public List<string> errors = new ArrayList<string>();
    public String total;
    public int total_pages;
    public int page;
    public String limit;
    List<dataset> dataset = new ArrayList<dataset>();
}

<强> Albums.java

Albums albums = gson.fromJson(jsonString, Albums.class);

主要类

cardView

Reference

如何解析结果[JSONArray]？

3 个答案: