Implementing Search Filter in Adapter that parses a JSON

[lynx88]

I would like to implement a search filter in my adapter class (used in a fragment class showing a list of colors), but although I managed to do it for simpler examples, I don't know how to proceed in this class that receives a json array; I would like to filter the search on the colorCode, since I am not using pojo classes I don't know how to filter just using strings in getFilter() method. Thank you.

package ...

import...

public class ColorListAdapter extends RecyclerView.Adapter {

    private JSONArray colorList;

    public ColorListAdapter(JSONArray json){
        super();
        if(json != null){
            this.colorList = json;
        }
    }

    @NonNull [MENTION=93274]overr[/MENTION]ide
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_color_view, viewGroup, false);
        return new ColorListHolder(view);
    }

    [MENTION=93274]overr[/MENTION]ide
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        try {
            ((ColorListHolder)viewHolder).setContentValue(i);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    [MENTION=93274]overr[/MENTION]ide
    public int getItemCount() {
        return this.colorList.length();
    }

    private class ColorListHolder extends RecyclerView.ViewHolder {

        private TextView colorCodeText;
        private TextView colorNameText;
        private CardView imageView;

        public ColorListHolder(@NonNull View itemView) {
            super(itemView);
            this.colorCodeText = itemView.findViewById(R.id.colorCode_text);
            this.colorNameText = itemView.findViewById(R.id.colorName_text);
            this.imageView = itemView.findViewById(R.id.colorView);
        }

        public void setContentValue(int index) throws JSONException {
            this.colorNameText.setText(((JSONObject)colorList.get(index)).getString("Name"));
            this.colorCodeText.setText(((JSONObject)colorList.get(index)).getString("ColorCode"));
            this.imageView.setCardBackgroundColor(Color.parseColor(((JSONObject)colorList.get(index)).getString("HexString")));
        }
    }

}

 

[Rukbat]

See if any of these answers help you.

 

[lynx88]

I am trying this, but It does not work properly..

public class ColorListAdapter extends RecyclerView.Adapter implements Filterable {

    private JSONArray colorList;

    private List<String> colorListFiltered = new ArrayList<String>();

    public ColorListAdapter(JSONArray json) throws JSONException {
        super();
        if (json != null) {
            this.colorList = json;

                for (int i=0;i<json.length();i++){
                    //colorListFiltered.add((colorList.getString(i)));
                    colorListFiltered.add(json.getJSONObject(i).getString("Name"));
                }
        }
    }


    [MENTION=93274]overr[/MENTION]ide
    public Filter getFilter() {
        return new colorFilter();
    }


    @NonNull
    [MENTION=93274]overr[/MENTION]ide
    public RecyclerView.ViewHolder onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
        View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.fragment_color_view, viewGroup, false);
        return new ColorListHolder(view);
    }

    [MENTION=93274]overr[/MENTION]ide
    public void onBindViewHolder(@NonNull RecyclerView.ViewHolder viewHolder, int i) {
        try {
            ((ColorListHolder) viewHolder).setContentValue(i);
        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    [MENTION=93274]overr[/MENTION]ide
    public int getItemCount() {
        return this.colorListFiltered.size();
    }

    private class ColorListHolder extends RecyclerView.ViewHolder {

        private TextView colorCodeText;
        private TextView colorNameText;
        private CardView imageView;

        public ColorListHolder(@NonNull View itemView) {
            super(itemView);
            this.colorCodeText = itemView.findViewById(R.id.colorCode_text);
            this.colorNameText = itemView.findViewById(R.id.colorName_text);
            this.imageView = itemView.findViewById(R.id.colorView);
        }

        public void setContentValue(int index) throws JSONException {

            this.colorNameText.setText(colorListFiltered.get(index));
            //this.colorNameText.setText(((JSONObject) colorList.get(index)).getString("Name"));
            
                this.colorCodeText.setText(((JSONObject) colorList.get(index)).getString("ColorCode"));
                this.imageView.setCardBackgroundColor(Color.parseColor(((JSONObject) colorList.get(index)).getString("HexString")));

        }
    }


    public class colorFilter extends Filter{

        [MENTION=93274]overr[/MENTION]ide
        protected FilterResults performFiltering(CharSequence constraint) {

            FilterResults Result = new FilterResults();
            // if constraint is empty return the original names

            if(constraint.length() == 0 ) {
                ArrayList<String> arrColorList = new ArrayList<>();
                for (int i = 0; i < colorList.length(); i++) {
                    try {
                        arrColorList.add(colorList.getJSONObject(i).getString("Name"));
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }
                }
                Result.values = arrColorList;
                Result.count = arrColorList.size();
                return Result;
            }

            /*if(constraint.length() == 0 ){
                Result.values = colorList;
                Result.count = colorList.length();
                return Result;*/

            else {

                List<String> Filtered_Names = new ArrayList<String>();
                String filterString = constraint.toString().toLowerCase();
                String filterableString = "";

                for (int i = 0; i < colorList.length(); i++) {
                    try {
                        filterableString = (colorList.getJSONObject(i)).getString("Name");
                    } catch (JSONException e) {
                        e.printStackTrace();
                    }

                    if (filterableString.toLowerCase().contains(filterString)) {
                        Filtered_Names.add(filterableString);
                    }
                }

                Result.values = Filtered_Names;
                Result.count = Filtered_Names.size();
                return Result;

            }

        }

        [MENTION=93274]overr[/MENTION]ide
        protected void publishResults(CharSequence constraint, FilterResults results) {

            colorListFiltered = (ArrayList<String>) results.values;
            notifyDataSetChanged();
        }
    }


}