Question

你是新来的android我试图使用jsonarray请求将json响应传递给arraylist但我收到此错误：

错误：

凌空错误org.json.JSONException：值＆lt; java.lang.String类型的br无法转换为JSONArray

Php代码：

$userid=$_POST["userid"];

$semester=$_POST["semester"];

$level=$_POST["level"];

$stmt="SELECT coursecode,coursetitle,grade,credithrs,marks FROM tblresults WHERE userid = '$userid' and semester = '$semester' and level = '$level'";

$result=mysqli_query($conn,$stmt);
$responsea=array();

while($respons=mysqli_fetch_array($result)){
    $response["coursecode"]=$respons['coursecode'];
    $response["coursetitle"]=$respons['coursetitle'];
    $response["grade"]=$respons['grade'];
    $response["credithrs"]=$respons['credithrs'];
    $response["marks"]=$respons['marks'];
    $responsea[]=$response;
    }   
echo json_encode($responsea);

Php回应：

[{"coursecode":"csc234","coursetitle":"Information Security","grade":"A","credithrs":"3","marks":"80.00"},{"coursecode":"csc300","coursetitle":"Cryptography","grade":"B","credithrs":"3","marks":"65.00"}]

android代码：

    public ArrayList<resultInstance> extractresult() {

    CheckResultFragment checkResultFragment=new CheckResultFragment();
    final String gsem=checkResultFragment.gsem;
    final String glev=checkResultFragment.glev;

    JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.POST, jsonurl, null,
            new Response.Listener<JSONArray>() {

                @Override
                public void onResponse(JSONArray response) {
                    int i=0;
                    while (i<response.length()){
                        try {

                            JSONObject jsonObject=response.getJSONObject(i);
                            resultInstance resultinstance =new resultInstance(
                                    jsonObject.getString("coursecode"),
                                    jsonObject.getString("coursetitle"),
                                    jsonObject.getInt("credit"),
                                    jsonObject.getDouble("marks"),
                                    jsonObject.getString("grade"));
                            results.add(resultinstance);
                            i++;
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                }
            }, new Response.ErrorListener() {
        @Override
        public void onErrorResponse(VolleyError error) {

            error.printStackTrace();
        }
    }
    ){
        @Override
        protected Map<String, String> getParams() throws AuthFailureError {
            Map<String,String> params=new HashMap<>();
            params.put("userid",guid);
            params.put("level",glev);
            params.put("semester",gsem);

            return params;
        }
    };

    VolleySingleton.getInstance(context).addToRequestQueue(jsonArrayRequest);

    return  results;
}

任何帮助将不胜感激!!

Answer 1

调试和设置断点，你的API调用php响应不是JSONArray的格式。发送适当的JSONArray格式作为对API调用请求的响应。

Volley将JsonArray请求传递给Arraylist

1 个答案: