Fetching data from json using jsonArrayRequest

Question

I\'m trying to retrieve json data using JsonArrayRequest.Here\'s my code for doing that

public class QuestionDetailFragment extends Fragment {
   private static          


        

Answer 1

Thats because the JsonArrayRequest is being added to the volley queue which executes task asynchronously. So even though you are calling the Log.d("tag","data:"+data); after readQuestionDetails() the request has not executed yet, meaning data is null.

Something like this will work:

public class QuestionDetailFragment extends Fragment {
    private static final String url = "http://10.0.2.2:80/forumtest/readquestion.php?format=json";
    private String data;
    RequestQueue requestQueue;

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

    private void readQuestionDetails() {
        requestQueue = Volley.newRequestQueue(getActivity().getApplicationContext());
        JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.POST, url, new Response.Listener<JSONArray>() {
            @Override
            public void onResponse(JSONArray response) {

                try {
                    for (int i=0;i<response.length();i++) {
                        JSONObject jsonObject = response.getJSONObject(i);

                        data=jsonObject.getString("user");
                        printData(data);
                    }

                } catch (JSONException e) {
                    e.printStackTrace();
                    Log.e("user",e.getMessage());
                }
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                Log.e("user", error.getMessage());
            }
        });

        requestQueue.add(jsonArrayRequest);
    }

    private void printData(String data){
        Log.d("user","data:"+data);
    }
}