Question

我得到了不同结构的JSON。一个是画廊，但其他没有。

第一个JSON :(没有图库）

{
  "id": "12345",
  "title": "titletitle",
  "fulltext": "texttext",
  "related_articles":[
    {
      "id": "12346",
      "title": "titletitle",
      "image_name": "www.example.com/img1.png"
    },
    {
      "id": "12347",
      "title": "titletitle",
      "image_name": "www.example.com/img2.png"
    }
  ]
}

第二个JSON（带图库）

{
  "id": "12345",
  "title": "titletitle",
  "fulltext": "texttext",
  "gallery": [
    "www.example.com/img1.png",
    "www.example.com/img1.png",
    "www.example.com/img1.png",
    "www.example.com/img1.pngg",
    "www.example.com/img1.png"
  ],
  "related_articles":[
    {
      "id": "12346",
      "title": "titletitle",
      "image_name": "www.example.com/img1.png"
    },
    {
      "id": "12347",
      "title": "titletitle",
      "image_name": "www.example.com/img2.png"
    }
  ]
}

我把这个JSON放到这样的数组中：

data = whole JSON file, which I get from web service
JSONObject jRealObject = new JSONObject(data);

title = jRealObject.getString("title").toString();
text = jRealObject.getString("fulltext").toString();

JSONArray jArray = jRealObject.getJSONArray("gallery");
for (int i = 0; i < jArray.length(); i++) {
    gallery.add(jArray.getString(i));
}   

JSONArray jArray = jRealObject.getJSONArray("related_articles");
for (int i = 0; i < jArray.length(); i++) {
    jRealObject = jArray.getJSONObject(i);

    relatedId[i] = jRealObject.getString("id").toString();
    relatedTitle[i] = jRealObject.getString("title").toString();
    relatedImage[i] = jRealObject.getString("image_name").toString();
}

因此，当我通过画廊获得JSON时，它的工作非常完美，但是当文章没有画廊时，我会例外：

W/System.err(30635): org.json.JSONException: No value for gallery

如果有＆＃34;画廊＆＃34>我如何检查？在JSON ??

Answer 1

你可以使用GSON库，这个库是对象的json解析，非常强。

这里有一个示例，您可以使用json响应实现此库。

Answer 2

    JSONArray jArray = jRealObject.optJSONArray("gallery",null);

if(jArray != null)

    for (int i = 0; i < jArray.length(); i++) {
        gallery.add(jArray.getString(i));
    }

具有不同结构的JSON - Android

2 个答案: