如何使用Facebook Graph Api基于Cursor的分页 [英] How to use the Facebook Graph Api Cursor-based Pagination

问题描述

我没有找到任何关于这个话题的帮助。文档说

I didn't find any help on this topic. The Docs say

基于游标的分页是最有效的分页方式，应尽可能使用 - 游标指的是随机的标记数据列表中特定项目的字符串。除非删除该项目，否则光标将始终指向列表的相同部分，但如果删除项目，则该方法将无效。因此，您的应用程序不应存储任何较旧的游标，或者假定它们仍然有效。

Cursor-based pagination is the most efficient method of paging and should always be used where possible - a cursor refers to a random string of characters which mark a specific item in a list of data. Unless this item is deleted, the cursor will always point to the same part of the list, but it will be invalidated if an item is removed. Therefore, your app shouldn't store any older cursors or assume that they will still be valid.

When reading an edge that supports cursor pagination, you will see the following JSON response:

{
  "data": [
     ... Endpoint data is here
  ],
  "paging": {
    "cursors": {
      "after": "MTAxNTExOTQ1MjAwNzI5NDE=",
      "before": "NDMyNzQyODI3OTQw"
    },
    "previous": "https://graph.facebook.com/me/albums?limit=25&before=NDMyNzQyODI3OTQw"
    "next": "https://graph.facebook.com/me/albums?limit=25&after=MTAxNTExOTQ1MjAwNzI5NDE="
  }
}

我使用这种格式进行api调用，我如何在循环中查看所有页面

I am using this format to make an api call, how can i go through all pages in a loop

/* make the API call */
new GraphRequest(
    session,
    "/{user-id}/statuses",
    null,
    HttpMethod.GET,
    new GraphRequest.Callback() {
        public void onCompleted(GraphResponse response) {
            /* handle the result */
        }
    }
).executeAsync();

推荐答案

我想出了一个很好的方法来遍历Facebook图api页面使用光标分页

I figured out a good way to traverse through facebook graph api pages using cursor pagination

    final String[] afterString = {""};  // will contain the next page cursor
    final Boolean[] noData = {false};   // stop when there is no after cursor 
    do {
        Bundle params = new Bundle();
        params.putString("after", afterString[0]);
        new GraphRequest(
                accessToken,
                personId + "/likes",
                params,
                HttpMethod.GET,
                new GraphRequest.Callback() {
                    @Override
                    public void onCompleted(GraphResponse graphResponse) {
                        JSONObject jsonObject = graphResponse.getJSONObject(); 
                        try {
                            JSONArray jsonArray = jsonObject.getJSONArray("data");

                            //  your code 


                            if(!jsonObject.isNull("paging")) {
                                JSONObject paging = jsonObject.getJSONObject("paging");
                                JSONObject cursors = paging.getJSONObject("cursors");
                                if (!cursors.isNull("after"))
                                    afterString[0] = cursors.getString("after");
                                else
                                    noData[0] = true;
                            }
                            else
                                noData[0] = true;
                        } catch (JSONException e) {
                            e.printStackTrace(); 
                        }
                    }
                }
        ).executeAndWait();
    }
    while(!noData[0] == true);

这篇关于如何使用Facebook Graph Api基于Cursor的分页的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！