当我在第一个微调器中再次选择一个项目时发生错误，然后在第二个微调器中未解析相关数据意味着它没有刷新

Question

I have 3 spinners that use data parsed from a web service. When I select an item from 1st spinner then the 2nd spinner will present related data that was parsed.

But when I select an item again in 1st spinner then the related data is not parsed in 2nd spinner, so it doesn't refresh.

Can you help solving this issue? Thanks in advance.

    country_spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

    public void onItemSelected(AdapterView<?> parent, View view,
            int position, long id) {
            int item=country_spinner.getSelectedItemPosition();
            if(item!=0)
            {

                String selected1=country_spinner.getItemAtPosition(position).toString();
                System.out.println(selected1);
                progressDialog=ProgressDialog.show(getParent(), "", "Loading...");
                new StateTask().execute();

            }

            adapter1.notifyDataSetChanged();
    }

    @Override
    public void onNothingSelected(
            AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }
});

2nd spinner

      state_spinner.setOnItemSelectedListener(new OnItemSelectedListener() {

             public void onItemSelected(AdapterView<?> parent, View view,
                       int position, long id) {

                int item=state_spinner.getSelectedItemPosition();
               //   String sate=state_spinner.getSelectedItem().toString();
                if(item!=0)
                {

                    String selected=state_spinner.getItemAtPosition(position).toString();
                    System.out.println(selected);
                    city_spinner.setEnabled(false);
                    progressDialog=ProgressDialog.show(getParent(), "", "Loading...");
                        new CityTask().execute();
                }
                adapter2.notifyDataSetChanged();
               }

                    @Override
                    public void onNothingSelected(
                            AdapterView<?> arg0) {
                        // TODO Auto-generated method stub

                    }
        });

StateTask

  public class StateTask extends AsyncTask<String, String, String>{

    @Override
    protected String doInBackground(String... arg0) {
        //Creating JSON Parser instance//////////
        JSONParser jParser=new JSONParser();
        //Getting JSON String from URL..............
        JSONObject jObject=jParser.getJSONFromUrl(URL);
        try
        {
            jsonArray=jObject.getJSONArray(TAG_STATES);
            //final String[] country_array_spinner = new String[jsonArray.length()]; 


            for (int i=0; i<jsonArray.length(); i++)
            {
                //country_array_spinner[i]=jsonArray.getJSONObject(i).getString(TAG_STATE);
                adapter1.add(jsonArray.getJSONObject(i).getString(TAG_STATE));
            }

        }
        catch(JSONException e){
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(String result) {
         state_spinner.setEnabled(true);
        state_spinner.setAdapter(adapter1);
        progressDialog.dismiss();
        super.onPostExecute(result);
    }
}

CityTask

public class CityTask extends AsyncTask<String, String, String>{

    @Override
    protected String doInBackground(String... arg0) {
        //Creating JSON Parser instance//////////
        JSONParser jParser=new JSONParser();
        //Getting JSON String from URL..............
        JSONObject jObject=jParser.getJSONFromUrl(URLs);
        try
        {
            String sate=state_spinner.getSelectedItem().toString();

            jsonArray=jObject.getJSONArray(TAG_CITIES);
            //final String[] country_array_spinner = new String[jsonArray.length()]; 

            for (int i=0; i<jsonArray.length(); i++)

            {
                JSONObject e=jsonArray.getJSONObject(i);
                String ab=e.getString(TAG_STATE);
                Log.v(ab, "hgdsagds");
                if(ab.contains(sate)){
                    adapter2.add(jsonArray.getJSONObject(i).getString(TAG_CITY));
                }
                //country_array_spinner[i]=jsonArray.getJSONObject(i).getString(TAG_STATE);

            }

        }
        catch(JSONException e){
            e.printStackTrace();
        }
        return null;
    }
    @Override
    protected void onPostExecute(String result) {
        city_spinner.setEnabled(true);
        city_spinner.setAdapter(adapter2);
        progressDialog.dismiss();
        super.onPostExecute(result);
    }
}

Answer 1

It looks to me like you have a code logic error...

adapter1.add(jsonArray.getJSONObject(i).getString(TAG_STATE)); 

You never clear/null your adapter (at least in the posted code), you just keep adding to it using the above code. This could appear to you as not refreshing as the new items would be at the end of the spinner (possibly out of sight).

Or, you could have left out of the post the code where you do that...