handle response which has different type in Retrofit 2

Question

Need help with handling different JSON field types response in Retrofit 2

The serverapi return 2 different types of response and both in Http 200 OK:

if success, server will return this response: {"error_code":"0000","error_message":"success!",item_id:"SHVR25","description":{"DENOMINATION":"25","PRICE":"28000"}}

not success,: {"error_code":"1111","error_message":"failed!",item_id:"SHVR10","description":""}

POJO Bill

    public class Bill{

    @SerializedName("error_code")
    @Expose
    public String errorCode;

    @SerializedName("error_message")
    @Expose
    public String errorMessage;

    @SerializedName("item_id")
    @Expose
    public String itemId;

    @SerializedName("description")
    @Expose
    public Description descriptionss;

    public String getErrorCode() {
        return errorCode;
    }

    public void setErrorCode(String errorCode) {
        this.errorCode = errorCode;
    }

    public String getErrorMessage() {
        return errorMessage;
    }

    public void setErrorMessage(String errorMessage) {
        this.errorMessage = errorMessage;
    }

    public String getItemId() {
        return itemId;
    }

    public void setItemId(String itemId) {
        this.itemId = itemId;
    }

    public Description getDescriptionss() {
        return descriptionss;
    }

    public void setDescriptionss(Description descriptionss) {
        this.descriptionss = descriptionss;
    }
    public Description getDescriptionss() {
        return descriptionss;
    }
    }

POJO Description

    public class Description{
    @SerializedName("DENOMINATION")
    @Expose
    public String dENOMINATION;
    @SerializedName("PRICE")
    @Expose
    public String pRICE;


    public String getdENOMINATION() {
        return dENOMINATION;
    }

    public void setdENOMINATION(String dENOMINATION) {
        this.dENOMINATION = dENOMINATION;
    }

    public String getpRICE() {
        return pRICE;
    }

    public void setpRICE(String pRICE) {
        this.pRICE = pRICE;
    }
}

CallBack

    @Override
    public void onResponse(Call<Bill> call, Response<Bill> response) {
        if(response.isSuccessful()){
            Bill bill= response.body();
            Timber.d("bill contains=="+bill.toString());
                            }
        }else{
            Timber.d("response is not success!");}
    }
    @Override
    public void onFailure(Call<JsonElement> call, Throwable t) {
            Timber.e("retrofit failed.... throwable:"+t.toString());
                    }
                }
    );

Actually my problem similar to this cases: How to handle response which can be different Type in Retrofit 2

Problem: call back always called onFailed and said that java.lang.IllegalStateException: Expected BEGIN_OBJECT but was STRING at line 1 column 236 path $.description

Question: How i can handle different types of response retrofit using POJO as callback not JsonElement, and without changing the server response?

I have try this How to handle Dynamic JSON in Retrofit? ( but it works for retrofit 1 ) and How to handle response which can be different Type in Retrofit 2 (it using JsonElement as callback response)

Answer 1

Use Object type ,

 @SerializedName("description")
  @Expose
  public Object descriptionss;

In your Bill class