Retrofit error: Expected BEGIN_ARRAY but was STRING

Question

In api response sometimes It can be array, sometimes it can be string.

Here details is Array

 {  "ts": "2015-06-16 11:28:33","success": true,"error": false,"details": [
{
  "user_id": "563",
  "firstname": "K.Mathan"
},
{
  "user_id": "566",
  "firstname": "Surya"
},
{
  "user_id": "562",
  "firstname": "Idaya"
} ]}

Sometimes details can be string

{  "ts": "2015-06-16 11:28:33",
"success": true,
"error": false,
"details": "no data" }

Here details is String

How to get value from this type of response

My current declaration is

  @SerializedName(value="details")
   public List<detailslist> details ;

Anyone please help me to find the solution?

tell the backend guys to send an empty array, not an arbitrary string. For *consistency* reasons — Blackbelt, Jun 16 '15 at 13:42
But we are using this kind of response for IOS also, they can get the value. Using retrofit only I cannot get the value — Mathankumar K, Jun 16 '15 at 13:47
*But we are using this kind of response for IOS also*, it is not an argument tbh — Blackbelt, Jun 16 '15 at 13:54

score 6 · Accepted Answer · answered Jun 16 '15 at 14:18

Did you try with the raw response type?

@GET("your_url")
void getDetails(Callback<Response> cb);

Then you can parse the Response using JSONObject and JSONArray like this:

    Callback<Response> callback = new Callback<Response>() {
       @Override
       public void success(Response detailsResponse, Response response2) {

        String detailsString = getStringFromRetrofitResponse(detailsResponse);

        try {
            JSONObject object = new JSONObject(detailsString);

            //In here you can check if the "details" key returns a JSONArray or a String

        } catch (JSONException e) {

        }

     }

     @Override
     public void failure(RetrofitError error) {

  });

Where the getStringFromRetrofitRespone could be:

public static String getStringFromRetrofitResponse(Response response) {
    //Try to get response body
    BufferedReader reader = null;
    StringBuilder sb = new StringBuilder();
    try {

        reader = new BufferedReader(new InputStreamReader(response.getBody().in()));

        String line;

        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line);
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    } catch (IOException e) {
        e.printStackTrace();
    }

    return sb.toString();

}

Hi, can I use? - new Callback() { @Override public void success(JSONObject jsonObj, Response response) { — Wijay Sharma, Feb 01 '18 at 11:10

korrekorre · Answer 2 · 2015-06-17T08:26:23.640

0

I guess you can write your own deserializer to use in retrofit but it also works with just inferring that it's an object and then handle it later in your code.

@SerializedName(value="details")
public Object details;

edited Jun 17 '15 at 08:26

answered Jun 16 '15 at 13:55

korrekorre

1,025
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I tried, But I got an error " multiple JSON fields named details" – Mathankumar K Jun 16 '15 at 14:05

Retrofit error: Expected BEGIN_ARRAY but was STRING

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