带有Web服务的Android片段

Question

I am invoking the web service inside fragment. The Bankranking list from web service has the value and I am able to print. But after the method onSuccess , if the print the list I am getting array index out of bound Exception.

public class BankRatingOffsiteIndustry extends Fragment {

    List<BankRankingDTO> bankRanking = new ArrayList<>();
    @Override
    public void onStart() {
        super.onStart();
        RequestParams params = new RequestParams();
        params.add("date", "2017-12-31");
        params.add("currency", "EL");
        invokeWebS(params);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.bankrankinginfo, container, false);
        return v;
    }

    public void invokeWebS(RequestParams params) {
        final AsyncHttpClient client = new AsyncHttpClient();
        client.get("url", params, new JsonHttpResponseHandler() {
            @Override
            public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
                ObjectMapper mapperObject = new ObjectMapper();
                System.out.println("Input Json: " + response.toString());
                    bankRanking  = mapperObject.readValue(response.toString(), mapperObject.getTypeFactory().constructCollectionType(List.class, BankRankingDTO.class));

                 /*  setResultList(resultList);*/
                    Log.i("exit",bankRanking.get(0).getInstitutionName());
                }

                catch (IOException e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }

        });

    Log.i("values",bankRanking.get(0).getInstitutionName());
}

Answer 1

Check your bankRanking list size if is not empty then it work. And you can also used for each loop to print list like below code:

if (!bankRanking.isEmpty()){
    for(BankRankingDTO object:bankRanking) {
        Log.i("values", object.getInstitutionName());
    }
}

Answer 2

You are trying to show a log when the web service call is yet to return. The web service call is Async . So you need to wait for the values to be returned to the application and then print the log.

Just move the following line inside your onSuccess function.

Log.i("values",bankRanking.get(0).getInstitutionName());