How can I return String or JSONObject from asynchronous callback using Retrofit?

Question

For example, calling

api.getUserName(userId, new Callback() {...});

cause:

retrofit.RetrofitError: retrofit.         


        

Answer 1

When @lordmegamax answer completely work there is much nicer solution which is come from

Okio is a new library that complements java.io and java.nio

other squares project which already tight with retrofit and therefore you don't need to add any new dependency and it's have to be reliable:

ByteString.read(body.in(), (int) body.length()).utf8();

ByteString is an immutable sequence of bytes. For character data, String is fundamental. ByteString is String's long-lost brother, making it easy to treat binary data as a value. This class is ergonomic: it knows how to encode and decode itself as hex, base64, and UTF-8.

Full example:

public class StringConverter implements Converter {
  @Override public Object fromBody(TypedInput body, Type type) throws ConversionException {
    try {
      return ByteString.read(body.in(), (int) body.length()).utf8();
    } catch (IOException e) {
      throw new ConversionException("Problem when convert string", e);
    }
  }

  @Override public TypedOutput toBody(Object object) {
    return new TypedString((String) object);
  }
}