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

Answer 1

Yes , i think you have to use model class. Here is example with onPostExecute.

    @Override
    protected void onPostExecute(String s) {
        super.onPostExecute(s);
        pd.dismiss();

        try {
            JSONObject object = new JSONObject(s.toString());
            YourModelNameList = new ArrayList<>();

            if (object.getString("status").equalsIgnoreCase("true")) {
                JSONArray array = object.getJSONArray("data");
                for (int i = 0; i < array.length(); i++) {
                    JSONObject jsonProduct = array.getJSONObject(i);
                    YourModelName home = new Home();
                    String special = jsonProduct.getString("special_price");
                    home.setId(jsonProduct.getString("product_id"));
                    home.setName(jsonProduct.getString("product_name"));
                    home.setPrice(jsonProduct.getString("price"));
                    YourModelArrayList.add(home);
                }
            } 
            Collections.sort(YourModelArrayList, new Comparator<YourModelName>() {
                public int compare(YourModelName emp1, YourModelName emp2) {
                    int price1 = emp1.getPrice();
                    int price2 = emp2.getPrice();



                    return Integer.compare(price1, price2);

                }
            });


            adapter = new YourModelArrayListAdapter(getActivity(), YourModelArrayList);
            recyclerView.setAdapter(adapter);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    } 

Try this if this will help you. Thank you.

Answer 2

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);  
}  
} 

Answer 3

Instead of creating one object of data with string array for its fields. Create one object for each element of JsonArray. Create a list for objects from JsonArray. Pass that list in your Custom Adapter. Set the listview adapter as custom adapter.

Now whenever you want to sort the data by any field. Just use Java collections comparator or you can write your own custom comparator.

After that just call notifyDataSetChanged() on the adapter.

Edit -

You can create your model SearchItem like below

class SearchItem {
    private String voterId;
    private String boothNameId;
    private String searchName;
    private String houseNumber;
    private String gender;

    public void setVoterId(String voterId) {
        this.voterId = voterId;
    }

    public String getVoterId() {
        return voterId;
    }

    ......................(Add as many fields you want and their corresponding getter and setter methods)
}

Your Json parse class can be modified like this (You have to populate all the fields of SearchItem class.

class ParseJsonData {

    public static ArrayList<SearchList> parseSearchresult(String jsonResponse) {
        try {
            JSONObject searchData = new JSONObject(jsonResponse);
            JSONArray searchArray=searchData.getJSONArray(SEARCH_VOTER_ARRAY);
            ArrayList<SearchItem> searchList = new ArrayList<SearchItem>();
            for(int index = 0; index < searchArray.length(); index++) {
                JSONObject searchItem = searchArray.get(index);
                SearchItem item = new SearchItem();
                item.setVoterId(searchItem.optString(KEY_VOTER_ID, null);
                item.setBoothNameId(searchItem.optString(KEY_BOOTHNAME_ID, null);
                item.setSearchName(searchItem.optString(KEY_SEARCH_NAME, null);
                item.setHouseNumber(searchItem.optString(KEY_SEARCH_HOUSE_NUMBER, null);
                item.setGender(searchItem.optString(KEY_SEARCH_GENDER, null);
                searchList.add(item);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }
        return searchList;
    }
}

Now you can create your own custom adapter as follows

class CustomSearchList extends BaseAdapter {
    ArrayList<SearchItem> mSearchList;
    Context mContext;

    public CustomSearchList(Context context, ArrayList<SearchItem> searchList) {
        mContext = context;
        mSearchList = searchList;
    }

    ..........................(Implement methods for BaseAdapter or other methods you want to write)
}

Here searchList is passed as reference, so any update in that list followed by notify call to adapter will reflect the change.

Your listview class can be modified like this. parseSearchList() method returns an arraylist of all searchlist.

private void getList(String json) {
    ArrayList<SearchItem> searchList = ParseJsonData.parseSearchresult(json);
    CustomSearchList adapter = new CustomSearchList(this, searchList);
    searchlistView.setAdapter(adapter);

    mBtn.setOnClickListener(this, new OnClickListener() {
        @Override
        public void onClick(....) {
            //Suppose when some button click happens for sorting
            Collections.sort(searchList, <yourCustomComparator>);
            notifyDataSetChanged();
        }
    });
}

It would be better if you can make searchList as a Member variable not the local one.

Answer 4

In my case i got homeList(ArrayList of model 'Home') from JSONParser class so befor setAdapter

 Collections.sort(homeList, new Comparator<Home>() {
                    public int compare(Home emp1, Home emp2) {
                        int price1 = emp1.getPrice();
                        int price2 = emp2.getPrice();



                        return Integer.compare(price1, price2);

                    }
                });
    Adapter adapter = new Adapter(getActivity(),homeList);
    listView.setadapter(adapter);

So this will first sort whole arraylist and then we need to setAdapter.

Try this i think this will help you.

Answer 5

I have sort the arraylist named ArrayList> addressaray; add response data to arraylist using

JSONObject object = new JSONArray(s.toString());
JSONArray arr1 = new JSONArray(object.getString("data").toString()).getJSONArray(0);
for (int i = 0; i < arr1.length(); i++) {
 JSONObject jsonObject = arr1.getJSONObject(i);
 HashMap<String, String> data = new HashMap<String, String>();
 data.put("id", jsonObject.getString("id"));
 data.put("date_inspected_details", jsonObject.getString("date_inspected_details"));
 addressaray.add(data);
    }
    adapter = new PropertiesEvaluatedFragmentAdapter(getActivity(), addressaray, getActivity().getSupportFragmentManager());
  listView.setAdapter(adapter);
  adapter.notifyDataSetChanged();
}

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

    String item = parent.getItemAtPosition(position).toString();
 if(addressaray.size() > 0){
                sortListView(item);
                adapter.notifyDataSetChanged();
            }else{
                Toast.makeText(getActivity(), "No Record found.", Toast.LENGTH_SHORT).show();
            }

}

  private void sortListView(String option) {
        switch (option) {
            case "Date":

Collections.sort(addressaray, new Comparator<HashMap<String, String>>() {
                    final static String COMPARE_KEY = "date_inspected_details";

                    @Override
                    public int compare(HashMap<String, String> lhs,
                                       HashMap<String, String> rhs) {
                        String Date1 = lhs.get(COMPARE_KEY);
                        String Date2 = rhs.get(COMPARE_KEY);
                        Log.e("Date1", Date1);
                        Log.e("Date2", Date2);
                        // Do your comparison logic here and retrn accordingly.
                        return Date1.compareTo(Date2);
                    }
                });
  break;
}
}JSONObject object = new JSONArray(s.toString());
JSONArray arr1 = new JSONArray(object.getString("data").toString()).getJSONArray(0);
for (int i = 0; i < arr1.length(); i++) {
 JSONObject jsonObject = arr1.getJSONObject(i);
 HashMap<String, String> data = new HashMap<String, String>();
 data.put("id", jsonObject.getString("id"));
 data.put("date_inspected_details", jsonObject.getString("date_inspected_details"));
 addressaray.add(data);
    }
    adapter = new PropertiesEvaluatedFragmentAdapter(getActivity(), addressaray, getActivity().getSupportFragmentManager());
  listView.setAdapter(adapter);
  adapter.notifyDataSetChanged();
}

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

    String item = parent.getItemAtPosition(position).toString();
 if(addressaray.size() > 0){
                sortListView(item);
                adapter.notifyDataSetChanged();
            }else{
                Toast.makeText(getActivity(), "No Record found.", Toast.LENGTH_SHORT).show();
            }

}

  private void sortListView(String option) {
        switch (option) {
            case "Date":

Collections.sort(addressaray, new Comparator<HashMap<String, String>>() {
                    final static String COMPARE_KEY = "date_inspected_details";

                    @Override
                    public int compare(HashMap<String, String> lhs,
                                       HashMap<String, String> rhs) {
                        String Date1 = lhs.get(COMPARE_KEY);
                        String Date2 = rhs.get(COMPARE_KEY);
                        Log.e("Date1", Date1);
                        Log.e("Date2", Date2);
                        // Do your comparison logic here and retrn accordingly.
                        return Date1.compareTo(Date2);
                    }
                });
  break;
}
}