Question

当我需要一个响应时，我习惯使用Volley但是在这里，我能看到实现我想要的唯一方法就是使用2个响应。这是个主意：

从Android发布username，在Php中获取匹配的user_id，我喜欢这样：

<?php

require('dbConnect.php');

//this is me, my username in the user table
$Number = $_POST['phonenumberofuser'];

// get the username in the user table, then get the matching user_id
                $query = "SELECT * FROM user WHERE username = ?";
                $stmt = $con->prepare($query) or die(mysqli_error($con));
                $stmt->bind_param('s', $Number) or die ("MySQLi-stmt binding failed ".$stmt->error);
                $stmt->execute() or die ("MySQLi-stmt execute failed ".$stmt->error);
                $result = $stmt->get_result();

            while ($row = $result->fetch_assoc()) {
                //get the corresponding user_id in the row
            //this is the matching user_id in the user table of the user
            $user_id = $row["user_id"];
            }

然后在Php脚本的下一部分中，我想使用user_id来获取user_id创建的评论，如下所示：

$sql2 = "SELECT * FROM review WHERE user_id = '$user_id'";
$results = array();

    $result2 = mysqli_query($con,$sql2);

        //if user_id has reviews in the db
    while($row = mysqli_fetch_array($result2)) {
        //make an array called $results
                 $results[] = array(
         'category' => $row['cat_name'], 
         'name' => $row['name'],
         'phone' => $row['phone'],
         'comment' => $row['comment'],
         );
    }
    $json = json_encode($results);
echo $json;
        ?>

正如您所看到的，我的php文件与我的Android Volley代码所处理的$json相呼应，在视图中为我提供了name，phone和comment。 / p>

但是我在哪里将user_id放入我的排球，所以我可以显示user_id创建的相关评论？

这是我的Volley代码：

// Creating volley request obj
        JsonArrayRequest movieReq = new JsonArrayRequest(url,

                new Response.Listener<JSONArray>() {

                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();

                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Review review = new Review();
                                review.setCategory(obj.getString("category"));

                                review.setName(obj.getString("name"));
                                review.setPhone(obj.getString("phone"));
                                review.setComment(obj.getString("comment"));

                                reviewList.add(review);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }

                        // notifying list adapter about data changes
                        // so that it renders the list view with updated data
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.d(TAG, "Error: " + error.getMessage());
                        hidePDialog();

                    }
                });

        // Adding request to request queue
        AppController.getInstance().addToRequestQueue(movieReq);
    }

Answer 1

在第一个请求的onResponse中添加新的截击请求的示例

// change JSONArrayrequest to your appropiate request to get the user id
JsonArrayRequest userReq = new JsonArrayRequest(URL_TO_GET_USERID,
    new Response.Listener <JSONArray> () {
        @Override
        public void onResponse(JSONArray response) {                
            // parse your response to get the user_id
            String user_id = <RESULT FROM PARSING YOUR RESPONSE>;
            String URL_WITH_USERID = <YOUR URL> + user_id;
            JsonArrayRequest movieReq = new JsonArrayRequest(URL_WITH_USERID,

                new Response.Listener <JSONArray> () {
                    @Override
                    public void onResponse(JSONArray response) {
                        Log.d(TAG, response.toString());
                        hidePDialog();

                        // Parsing json
                        for (int i = 0; i < response.length(); i++) {
                            try {

                                JSONObject obj = response.getJSONObject(i);
                                Review review = new Review();
                                review.setCategory(obj.getString("category"));

                                review.setName(obj.getString("name"));
                                review.setPhone(obj.getString("phone"));
                                review.setComment(obj.getString("comment"));

                                reviewList.add(review);

                            } catch (JSONException e) {
                                e.printStackTrace();
                            }

                        }

                        // notifying list adapter about data changes
                        // so that it renders the list view with updated data
                        adapter.notifyDataSetChanged();
                    }
                }, new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        VolleyLog.d(TAG, "Error geting user info: " + error.getMessage());
                        hidePDialog();

                    }
                });

            // Adding request for getting user info to request queue
            AppController.getInstance().addToRequestQueue(movieReq);
        }
    }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {
            VolleyLog.d(TAG, "Error getting user: " + error.getMessage());
            hidePDialog();   
        }
    });

// Adding request for getting user_id to request queue
AppController.getInstance().addToRequestQueue(userReq);

Android Volley，如何获得响应并在另一个响应中使用它？

1 个答案: