I think that's bad api response and should be fixed from backend. But if you want to address the problem, you have to deserialize response to String using String converter. You can't do deserialize it to your Pojo using Gson converter.
StringConverter.java
public class StringConverter implements Converter {
@Override
public Object fromBody(TypedInput typedInput, Type type) throws ConversionException {
String text = null;
try {
text = fromStream(typedInput.in());
} catch (IOException ignored) { }
return text;
}
@Override
public TypedOutput toBody(Object o) {
return null;
}
public static String fromStream(InputStream in) throws IOException {
BufferedReader reader = new BufferedReader(new InputStreamReader(in));
StringBuilder out = new StringBuilder();
String newLine = System.getProperty("line.separator");
String line;
while ((line = reader.readLine()) != null) {
out.append(line);
out.append(newLine);
}
return out.toString();
}
}
API Call implementation
RestAdapter restAdapter = new RestAdapter.Builder()
.setEndpoint(API_URL)
.setConverter(new StringConverter())
.build();
YourAPI api = restAdapter.create(YourAPI.class);
api.yourService(parameter,new RestCallback<String>() {
@Override
public void success(String response, Response retrofitResponse) {
super.success(response, retrofitResponse);
//process your response here
//convert it from string to your POJO, JSON Object, or JSONArray manually
}
@Override
public void failure(RetrofitError error) {
super.failure(error);
}
});
