android - After sorting JSONArray,Custom list view not changed?

Question

I am sorting JSONArray and show them in a custom list view, but after sorting the data does not changed in custom list view.

Here is my code for fab button to select which sort is to be perform:

fab.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {

        AlertDialog.Builder builder=new AlertDialog.Builder(SearchResult.this);
        builder.setTitle("Sort List Item");
        builder.setItems(new CharSequence[]{"By Name", "By Father Name","By EPIC","By House Number"}, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {

                switch (i)
                {
                    case 0:
                        Toast.makeText(getApplicationContext(), "By Name", Toast.LENGTH_SHORT).show();

                        sortJsonTechnique="1";
                        if (myData)
                        {
                            sortByName(sortdata,sortJsonTechnique);
                        }
                        break;
                    case 1:

                        Toast.makeText(getApplicationContext(), "By Father Name", Toast.LENGTH_SHORT).show();
                        sortJsonTechnique="2";
                        if (myData)
                        {
                            sortByName(sortdata,sortJsonTechnique);
                        }

                        break;
                    case 2:

                        Toast.makeText(getApplicationContext(), "By EPIC", Toast.LENGTH_SHORT).show();
                        sortJsonTechnique="3";
                        if (myData)
                        {
                            sortByName(sortdata,sortJsonTechnique);
                        }

                        break;
                    case 3:

                        Toast.makeText(getApplicationContext(), "By House Number", Toast.LENGTH_SHORT).show();
                        sortJsonTechnique="4";
                        if (myData)
                        {
                            sortByName(sortdata,sortJsonTechnique);
                        }

                        break;
                    default:
                        break;
                }

            }
        });
        builder.show();


    }
});

And after selection made in fab button click i sort json array. Here is code for parse json array:

 private void sortByName(String mysortJson,String sortType)
    {

        List<JSONObject> jsonObjects=new ArrayList<JSONObject>();

        try {

            JSONObject object=new JSONObject(mysortJson);
            JSONArray jsonArray=object.getJSONArray("Data");
            for (int i=0;i<jsonArray.length();i++)
            {
                jsonObjects.add(jsonArray.getJSONObject(i));
            }

            if (sortType.equals("1"))
            {
                Collections.sort(jsonObjects, new Comparator<JSONObject>() {
                    @Override
                    public int compare(JSONObject a, JSONObject b) {
                        String val1=new String();
                        String val2=new String();

                        try {

                            val1=(String) a.get("Name");
//                        Log.e("Value1",""+val1);
                            val2=(String) b.get("Name");
//                        Log.e("Value2",""+val2);

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

                        return val1.compareTo(val2);
                    }
                });

                for (int j=0;j<jsonObjects.size();j++)
                {
                    jsonArray.put(jsonObjects.get(j));
                }
                voter_id=new String[jsonArray.length()];
                boothname_id=new String[jsonArray.length()];
                voter_name=new String[jsonArray.length()];
                voter_f_m_h_name=new String[jsonArray.length()];
                voter_epic=new String[jsonArray.length()];
                voter_h_no=new String[jsonArray.length()];
                voter_mobile=new String[jsonArray.length()];
                voter_gender=new String[jsonArray.length()];
                voter_age=new String[jsonArray.length()];
                get_voter_dob=new String[jsonArray.length()];
                get_marriage_anniv=new String[jsonArray.length()];
                get_voter_caste_id=new String[jsonArray.length()];
                get_voter_status_id=new String[jsonArray.length()];
                get_voter_social_status_id=new String[jsonArray.length()];

                for (int c=0;c<jsonArray.length();c++)
                {
                    JSONObject fetchVoter = jsonArray.getJSONObject(c);
                    voter_id[c] = fetchVoter.getString(KEY_VOTER_ID);
                    boothname_id[c] = fetchVoter.getString(KEY_BOOTHNAME_ID);
                    voter_name[c] = fetchVoter.getString(KEY_SEARCH_NAME);
                    voter_f_m_h_name[c] = fetchVoter.getString(KEY_SEARCH_F_H_M_NAME);
                    voter_epic[c] = fetchVoter.getString(KEY_SEARCH_EPIC_NAME);
                    voter_h_no[c] = fetchVoter.getString(KEY_SEARCH_HOUSE_NUMBER);
                    voter_mobile[c]=fetchVoter.getString(KEY_SEARCH_MOBILE);
                    voter_gender[c]=fetchVoter.getString(KEY_SEARCH_GENDER);
                    voter_age[c]=fetchVoter.getString(KEY_SEARCH_AGE);
                    get_voter_dob[c]=fetchVoter.getString(KEY_SEARCH_DOB);
                    get_marriage_anniv[c]=fetchVoter.getString(KEY_MARRIEGE_ANNIV);
                    get_voter_caste_id[c]=fetchVoter.getString(KEY_GET_CASTE_ID);
                    get_voter_status_id[c]=fetchVoter.getString(KEY_GET_STATUS_ID);
                    get_voter_social_status_id[c]=fetchVoter.getString(KEY_GET_SOCIAL_STATUS);



                }
                CustomSearchList adapter=new CustomSearchList(this,ParseJsonData.voter_id,ParseJsonData.boothname_id,ParseJsonData.voter_name,ParseJsonData.voter_f_m_h_name,ParseJsonData.voter_epic,ParseJsonData.voter_h_no,ParseJsonData.voter_mobile,ParseJsonData.voter_age,ParseJsonData.voter_gender,ParseJsonData.get_marriage_anniv,ParseJsonData.get_voter_dob,ParseJsonData.get_voter_caste_id,ParseJsonData.get_voter_status_id,ParseJsonData.get_voter_social_status_id);
                searchlist.setAdapter(adapter);
                adapter.notifyDataSetChanged();



            }
            else if (sortType.equals("2"))
            {
                Collections.sort(jsonObjects, new Comparator<JSONObject>() {
                    @Override
                    public int compare(JSONObject a, JSONObject b) {
                        String val1=new String();
                        String val2=new String();

                        try {

                            val1=(String) a.get("FName");
//                        Log.e("Value1",""+val1);
                            val2=(String) b.get("FName");
//                        Log.e("Value2",""+val2);

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

                        return val1.compareTo(val2);
                    }
                });

                for (int j=0;j<jsonObjects.size();j++)
                {
                    jsonArray.put(jsonObjects.get(j));
                }
                voter_id=new String[jsonArray.length()];
                boothname_id=new String[jsonArray.length()];
                voter_name=new String[jsonArray.length()];
                voter_f_m_h_name=new String[jsonArray.length()];
                voter_epic=new String[jsonArray.length()];
                voter_h_no=new String[jsonArray.length()];
                voter_mobile=new String[jsonArray.length()];
                voter_gender=new String[jsonArray.length()];
                voter_age=new String[jsonArray.length()];
                get_voter_dob=new String[jsonArray.length()];
                get_marriage_anniv=new String[jsonArray.length()];
                get_voter_caste_id=new String[jsonArray.length()];
                get_voter_status_id=new String[jsonArray.length()];
                get_voter_social_status_id=new String[jsonArray.length()];

                for (int c=0;c<jsonArray.length();c++)
                {
                    JSONObject fetchVoter = jsonArray.getJSONObject(c);
                    voter_id[c] = fetchVoter.getString(KEY_VOTER_ID);
                    boothname_id[c] = fetchVoter.getString(KEY_BOOTHNAME_ID);
                    voter_name[c] = fetchVoter.getString(KEY_SEARCH_NAME);
                    voter_f_m_h_name[c] = fetchVoter.getString(KEY_SEARCH_F_H_M_NAME);
                    voter_epic[c] = fetchVoter.getString(KEY_SEARCH_EPIC_NAME);
                    voter_h_no[c] = fetchVoter.getString(KEY_SEARCH_HOUSE_NUMBER);
                    voter_mobile[c]=fetchVoter.getString(KEY_SEARCH_MOBILE);
                    voter_gender[c]=fetchVoter.getString(KEY_SEARCH_GENDER);
                    voter_age[c]=fetchVoter.getString(KEY_SEARCH_AGE);
                    get_voter_dob[c]=fetchVoter.getString(KEY_SEARCH_DOB);
                    get_marriage_anniv[c]=fetchVoter.getString(KEY_MARRIEGE_ANNIV);
                    get_voter_caste_id[c]=fetchVoter.getString(KEY_GET_CASTE_ID);
                    get_voter_status_id[c]=fetchVoter.getString(KEY_GET_STATUS_ID);
                    get_voter_social_status_id[c]=fetchVoter.getString(KEY_GET_SOCIAL_STATUS);



                }
                CustomSearchList adapter=new CustomSearchList(this,ParseJsonData.voter_id,ParseJsonData.boothname_id,ParseJsonData.voter_name,ParseJsonData.voter_f_m_h_name,ParseJsonData.voter_epic,ParseJsonData.voter_h_no,ParseJsonData.voter_mobile,ParseJsonData.voter_age,ParseJsonData.voter_gender,ParseJsonData.get_marriage_anniv,ParseJsonData.get_voter_dob,ParseJsonData.get_voter_caste_id,ParseJsonData.get_voter_status_id,ParseJsonData.get_voter_social_status_id);
                searchlist.setAdapter(adapter);
                adapter.notifyDataSetChanged();

            }
            else if (sortType.equals("3"))
            {
                Collections.sort(jsonObjects, new Comparator<JSONObject>() {
                    @Override
                    public int compare(JSONObject a, JSONObject b) {
                        String val1=new String();
                        String val2=new String();

                        try {

                            val1=(String) a.get("EPIC");
//                        Log.e("Value1",""+val1);
                            val2=(String) b.get("EPIC");
//                        Log.e("Value2",""+val2);

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

                        return val1.compareTo(val2);
                    }
                });

                for (int j=0;j<jsonObjects.size();j++)
                {
                    jsonArray.put(jsonObjects.get(j));
                }
                voter_id=new String[jsonArray.length()];
                boothname_id=new String[jsonArray.length()];
                voter_name=new String[jsonArray.length()];
                voter_f_m_h_name=new String[jsonArray.length()];
                voter_epic=new String[jsonArray.length()];
                voter_h_no=new String[jsonArray.length()];
                voter_mobile=new String[jsonArray.length()];
      

Answer 1

Before set the data to Listview, you should sort the data using comparator class in java.

you create one Model class with all variable what you want (name,booth_id etc)and store the each object into the ArrayList.

Collections.sort(ArrayListObject,new NameComparator()); 

example

class NameComparator implements Comparator{  
public int compare(Object o1,Object o2){  
YourClassName s1=(YourClassName )o1;  
YourClassName s2=(YourClassName )o2;  

return s1.name.compareTo(s2.name);  
}  
}