Android Retrofit Expected BEGIN_ARRAY

Question

I have problem with Retrofit.

CryptoCompareClient.java

public interface CryptoCompareClient {
@GET("/data/pricemulti")
Call<List<CryptoPrices>> multiCryptoPrices(@Query("fsyms") String crypto,
                                   @Query("tsyms") String currency);

@GET("/data/price")
Call<CryptoPrices> singleCryptoPrice(@Query("fsym") String crypto,
                                     @Query("tsyms") String currency);
}

RESPONSE JSON: (https://min-api.cryptocompare.com/data/pricemulti?fsyms=BTC,ETH,LSK&tsyms=USD,EUR,PLN)

{"BTC":{"USD":6731.55,"EUR":5716.11,"PLN":24359.79},"ETH":{"USD":244.41,"EUR":207.73,"PLN":905.73},"LSK":{"USD":3.42,"EUR":2.91,"PLN":12.49}}

RetrofitInterface.java

public class RetrofitInterface {
Retrofit retrofit = RetrofitClientInstance.getRetrofitInstance();
private static final String CURRENCY="USD,EUR,PLN,BTC";
public void multiCrypto(String names){
    CryptoCompareClient client=retrofit.create(CryptoCompareClient.class);
    Call<List<CryptoPrices>> call=client.multiCryptoPrices(names,CURRENCY);
    call.enqueue(new Callback<List<CryptoPrices>>() {
        @Override
        public void onResponse(Call<List<CryptoPrices>> call, Response<List<CryptoPrices>> response) {

        }

        @Override
        public void onFailure(Call<List<CryptoPrices>> call, Throwable t) {
            Log.d("MyCrypto", "fail retrof "+t);
        }
    });
}

}

Logcat

D/MyCrypto: fail retrof java.lang.IllegalStateException: Expected BEGIN_ARRAY but was BEGIN_OBJECT at line 1 column 2 path $

There are no json arrays inside, just key value pairs.

Ahmed Hegazy
– Ahmed Hegazy

2018-09-21 22:46:34 +00:00
Commented Sep 21, 2018 at 22:46 — Ahmed Hegazy
– Ahmed Hegazy, Commented Sep 21, 2018 at 22:46

Ben P. · Accepted Answer · 2018-09-21 22:54:18Z

2

Change Call<List<CryptoPrices>> to Call<Map<String,CryptoPrices>>. The response is not a list, it’s a map of strings (like ”BTC”) to data.

answered Sep 21, 2018 at 22:54

Ben P.

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Comments

jbarros · Accepted Answer · 2018-09-23 20:10:39Z

0

Your API method:

@GET("/data/pricemulti")
Call<List<CryptoPrices>> multiCryptoPrices(@Query("fsyms") String crypto,
                               @Query("tsyms") String currency);

expects a list of CryptoPrices as an array [...] and you are providing an object {...}.

Good luck with your crypto-client!

edited Sep 23, 2018 at 20:10

answered Sep 21, 2018 at 22:53

jbarros

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