Reading data from my_Data class in my MainActivity using AsyncTask

Question

How to get 2 array list (1 String ,1 Integer) from asynctask and print them in Mainactivity??

This my AsyncTask:

private class ReadJSONFeedTask extends AsyncTask<String, Void, String> {
    @Override

    protected String doInBackground(String... urls) {

        return readJSONFeed(urls[0]);
    }
    protected void onPostExecute(String result) {
        try {
            JSONArray jsonArray = new JSONArray(result);
            Log.i("JSON", "Number of surveys in feed: " +jsonArray.length());
            for (int i = 0; i < jsonArray.length(); i++) {
                JSONObject jsonObject = jsonArray.getJSONObject(i);
                Toast.makeText(getBaseContext(), jsonObject.getString("city"),Toast.LENGTH_SHORT).show();

               x.setStation_name(jsonObject.getString("city"));
               x.setStation_petrol_amount(jsonObject.getInt("amount"));

            }

            System.out.println("*******"+x.getStation_name());
            System.out.println("*******"+x.getStation_petrol_amount());



        } catch (Exception e) {
            e.printStackTrace();
        }

    }
        }

Here my output in system.out.print >> and it's OK.

This is my_Data class:

 public      ArrayList<String> city = new ArrayList<>() ;
      public      ArrayList<Integer> amount = new ArrayList<>() ;


    public  void setStation_petrol_amount(int station_petrol_amount) {
        amount.add(station_petrol_amount);
    }

    public  void setStation_name(String station_name)
    {
        city.add(station_name);
    }

       public  ArrayList<String> getStation_name()
    {
        return city;
    }

  public  ArrayList<Integer> getStation_petrol_amount() {
        return amount;
    }

My mainActivity:

    new ReadJSONFeedTask().execute();
    ReadJSONFeedTask ob = new ReadJSONFeedTask();
        ob.execute("http://192.168.12.1/server/index.php");
        System.out.println(">>>>:"+x.getStation_name());
        System.out.println(">>>>:"+x.getStation_petrol_amount());

The output if system.out.print >> has no data, how to get it??

It would be nice if you rephrase your question. What would you like to achieve? You can keep both integer and string in the same arraylist of type my_Data. — Rethinavel, Mar 23 '15 at 09:57
just i need get data from my_Data but when code run my_Data class still no have data in this time — m4m4, Mar 23 '15 at 10:01
It is due to its execution in Background, and have you considering using SparseArray which might suites batter for type. — Apar Amin, Mar 23 '15 at 10:03
please iam not good enough in android can someone solve my problem by writing the code that i need or explan by example what i should do — m4m4, Mar 23 '15 at 10:28

score 0 · Answer 1 · edited May 23 '17 at 12:30

How to get the result of OnPostExecute() to main activity because AsyncTask is a separate class?

see the answer for the question.. you can pass your 2 array lists as parameter of the callback method to called activity once the thread finishes the work

in that example the interface should be modified like this

public interface AsyncResponse {
void processFinish(List<String> firstlist,List<Integer> secondlist);}

then in post execute you have to pass the result arraylist as parameters

OR you can pass the x objects list to called activity by replacing the interface like below

   public interface AsyncResponse {
void processFinish(List<X> firstlist);}

can u give me example of this way ? – m4m4 Mar 23 '15 at 10:21 — m4m4, Mar 23 '15 at 10:21

Reading data from my_Data class in my MainActivity using AsyncTask

This my AsyncTask:

This is my_Data class:

My mainActivity:

1 Answers1