JSON 解析 GET 方法，尝试在微调器中显示值

Question

我正在尝试使用 JSON 解析在 Spinner 中显示值，但它没有采用 centerID 并给我错误为"找不到中心ID"。而且，微调视图中未显示任何内容。

这是我的 API 文件

BASE_URL : http://192.168.1.80/aoplnew/api/
API URL : BASE_URL/users/getdoctorslist/$center_id
METHOD : GET
PARAMETER TO PASS:
center_id=4
INPUT:
BASE_URL/users/getdoctorslist/4
OUTPUT:
{
"status": true,
"result": [
{
"doctor_id": "1",
"first_name": "Dr. Sagar",
"last_name": "Patil"
},
{
"doctor_id": "2",
"first_name": "Dr. Ashwini",
"last_name": "D"
}
],
"message": "Get Doctors list successfully!"
}
Errors:
1)
{
"status": false,
"message": "Center id should not empty!"
}
2)
{
"status": false,
"message": "There is no Center data found!"
}

这是我正在做连接的配置文件

public class Config {
//JSON URL
public static final String DATA_URL = "http://192.168.1.80/aoplnew/api/users/getdoctorslist/{center_id}";
//Tags used in the JSON String
public static final String TAG_DOC_ID = "doctor_id";
public static final String TAG_FIRST_NAME = "first_name";
public static final String TAG_LAST_NAME = "last_name";
//JSON array name
public static final String JSON_ARRAY = "result";
}

这是我的片段，我正在尝试使用 Volley 库在 Spinner 中获取值

private ArrayList<String> docList;
//JSON Array
private JSONArray result;
private Spinner doctorLists;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_add_patient, container, false);
doctorLists = (Spinner) view.findViewById(R.id.doctors_list);
//Initializing the ArrayList
docList = new ArrayList<String>();
//This method will fetch the data from the URL
getData();
return view;  
} // closing onCreateView()
private void getData(){
//Creating a string request
StringRequest stringRequest = new StringRequest(Request.Method.GET,Config.DATA_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getDoctors(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
//Adding request to the queue
requestQueue.add(stringRequest);
}
private void getDoctors(JSONArray j){
//Traversing through all the items in the json array
for(int i=0;i<j.length();i++){
try {
//Getting json object
JSONObject json = j.getJSONObject(i);
//Adding the name of the student to array list
docList.add(json.getString(Config.TAG_FIRST_NAME));
} catch (JSONException e) {
e.printStackTrace();
}
}
//Setting adapter to show the items in the spinner
doctorLists.setAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_spinner_dropdown_item, docList));
}

Answer 1

您缺少请求方法

使用它
，您的 API 需要在调用时将center_id作为参数传递

StringRequest stringRequest = new StringRequest(Request.Method.GET,Config.DATA_URL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
JSONObject j = null;
try {
//Parsing the fetched Json String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getDoctors(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
}){ @Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
params.put("Content-Type", "application/json");
params.put("center_id", "4");
return params;
};
//Creating a request queue
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
//Adding request to the queue
requestQueue.add(stringRequest);
}

如果仍然不起作用，请告诉我

Answer 2

StringRequest stringRequest = new StringRequest(Config.DATA_URL,...

您没有在请求中设置center_id参数

Answer 3

我不擅长英语。

我建议使用 GSON 将 json 字符串转换为对象： https://github.com/google/gson

并建议使用改造连接到服务： https://square.github.io/retrofit/

Answer 4

您已经有了有关 API 的信息。

API URL : BASE_URL/users/getdoctorslist/$center_id
METHOD : GET
PARAMETER TO PASS:
center_id=4
INPUT:
BASE_URL/users/getdoctorslist/4

您的 API 需要一个值$center_id但您没有传递该值。您请求的网址是

"http://192.168.1.80/aoplnew/api/users/getdoctorslist/{center_id}"

请发送值 center_id。

试试这个

final String url = "http://192.168.1.80/aoplnew/api/users/getdoctorslist/4";
// prepare the Request
JsonObjectRequest getRequest = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>()
{
@Override
public void onResponse(JSONObject response) { 
try {
//Parsing the fetched JSON String to JSON Object
j = new JSONObject(response);
//Storing the Array of JSON String to our JSON Array
result = j.getJSONArray(Config.JSON_ARRAY);
//Calling method getStudents to get the students from the JSON Array
getDoctors(result);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
Log.d("Error.Response", response);
}
}
);
// add it to the RequestQueue   
RequestQueue requestQueue = Volley.newRequestQueue(getActivity());

将请求添加到队列 requestQueue.add(stringRequest(;