java - 使用recyclerview和cardview在android Activity 中读取JSON数组

Question

我知道如何解析 JSON 对象，如下所示

  {
    "users": [{
            "id": 2,
            "username": "user",
            "full_name": "user full name",
            "profilePicture": "/images/profileimage.png"
        },

        {
            "id": 2,
            "username": "user2",
            "full_name": "user2 full name",
            "profilePicture": "/images/profileimage2.png"
        }
    ]
}

通过像这样使用recyclerview和cardview调用JSON对象

  try {
                JSONObject response = new JSONObject(result);
                JSONArray users= response.optJSONArray("users");
                feedsList = new ArrayList<>();

                for (int i = 0; i < users.length(); i++) {
                    JSONObject user = users.optJSONObject(i);
                    FeedItem item = new FeedItem();
                    item.setTitle(user.optString("full_name"));
                    item.setThumbnail(user.optString("profilePicture"));
                    feedsList.add(item);
                }
            } catch (JSONException e) {
                e.printStackTrace();
            }

我想在 android Activity 中读取以下 JSON

[
     {
        "id": 2,
        "username": "user",
        "full_name": "user full name",
        "profilePicture": "/images/profileimage.png",
      },

      {
        "id": 2,
        "username": "user2",
        "full_name": "user2 full name",
        "profilePicture": "/images/profileimage2.png",
      }
    ]

任何人都知道我如何读取这种以 [ 而不是 { 开头的 JSON 可以帮助我

Answer 1

你的错误是你可以使用 posts.length 替换它 users.lenth

        try {

        JSONObject response = new JSONObject(result);
        JSONArray users= response.optJSONArray("users");
        feedsList = new ArrayList<>();

        for (int i = 0; i < users.length(); i++) {
            JSONObject user = users.optJSONObject(i);
            FeedItem item = new FeedItem();
            item.setTitle(user.optString("full_name"));
            item.setThumbnail(user.optString("profilePicture"));
            feedsList.add(item);
        }
    } catch (JSONException e) {
        e.printStackTrace();
    }