Custom Listview Adapter with filter Android

You can use the Filterable interface on your Adapter, have a look at the example below:

public class SearchableAdapter extends BaseAdapter implements Filterable {        private List<String>originalData = null;    private List<String>filteredData = null;    private LayoutInflater mInflater;    private ItemFilter mFilter = new ItemFilter();        public SearchableAdapter(Context context, List<String> data) {        this.filteredData = data ;        this.originalData = data ;        mInflater = LayoutInflater.from(context);    }     public int getCount() {        return filteredData.size();    }     public Object getItem(int position) {        return filteredData.get(position);    }     public long getItemId(int position) {        return position;    }     public View getView(int position, View convertView, ViewGroup parent) {        // A ViewHolder keeps references to children views to avoid unnecessary calls        // to findViewById() on each row.        ViewHolder holder;         // When convertView is not null, we can reuse it directly, there is no need        // to reinflate it. We only inflate a new View when the convertView supplied        // by ListView is null.        if (convertView == null) {            convertView = mInflater.inflate(R.layout.list_item, null);             // Creates a ViewHolder and store references to the two children views            // we want to bind data to.            holder = new ViewHolder();            holder.text = (TextView) convertView.findViewById(R.id.list_view);             // Bind the data efficiently with the holder.             convertView.setTag(holder);        } else {            // Get the ViewHolder back to get fast access to the TextView            // and the ImageView.            holder = (ViewHolder) convertView.getTag();        }         // If weren't re-ordering this you could rely on what you set last time        holder.text.setText(filteredData.get(position));         return convertView;    }        static class ViewHolder {        TextView text;    }     public Filter getFilter() {        return mFilter;    }     private class ItemFilter extends Filter {        @Override        protected FilterResults performFiltering(CharSequence constraint) {                        String filterString = constraint.toString().toLowerCase();                        FilterResults results = new FilterResults();                        final List<String> list = originalData;             int count = list.size();            final ArrayList<String> nlist = new ArrayList<String>(count);             String filterableString ;                        for (int i = 0; i < count; i++) {                filterableString = list.get(i);                if (filterableString.toLowerCase().contains(filterString)) {                    nlist.add(filterableString);                }            }                        results.values = nlist;            results.count = nlist.size();             return results;        }         @SuppressWarnings("unchecked")        @Override        protected void publishResults(CharSequence constraint, FilterResults results) {            filteredData = (ArrayList<String>) results.values;            notifyDataSetChanged();        }     }}

In your Activity or Fragment where of Adapter is instantiated :

editTxt.addTextChangedListener(new TextWatcher() {      @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {        System.out.println("Text ["+s+"]");                mSearchableAdapter.getFilter().filter(s.toString());                               }         @Override    public void beforeTextChanged(CharSequence s, int start, int count,            int after) {             }         @Override    public void afterTextChanged(Editable s) {    }});

Here are the links for the original source and another example

I hope it will be helpful for others.

// put below code (method) in Adapter classpublic void filter(String charText) {    charText = charText.toLowerCase(Locale.getDefault());    myList.clear();    if (charText.length() == 0) {        myList.addAll(arraylist);    }    else    {        for (MyBean wp : arraylist) {            if (wp.getName().toLowerCase(Locale.getDefault()).contains(charText)) {                myList.add(wp);            }        }    }    notifyDataSetChanged();}

declare below code in adapter class

private ArrayList<MyBean> myList;  // for loading main listprivate ArrayList<MyBean> arraylist=null;  // for loading  filter data

below code in adapter Constructor

this.arraylist = new ArrayList<MyBean>();    this.arraylist.addAll(myList);

and below code in your activity class

final EditText searchET = (EditText)findViewById(R.id.search_et);    // Capture Text in EditText    searchET.addTextChangedListener(new TextWatcher() {        @Override        public void afterTextChanged(Editable arg0) {            // TODO Auto-generated method stub            String text = searchET.getText().toString().toLowerCase(Locale.getDefault());            adapter.filter(text);        }        @Override        public void beforeTextChanged(CharSequence arg0, int arg1,                                      int arg2, int arg3) {            // TODO Auto-generated method stub        }        @Override        public void onTextChanged(CharSequence arg0, int arg1, int arg2,                                  int arg3) {            // TODO Auto-generated method stub        }    });

In your CustomAdapter class implement filterable.

 public class CustomAdapter extends BaseAdapter implements Filterable {    private List<ItemsModel> itemsModelsl;    private List<ItemsModel> itemsModelListFiltered;    private Context context;    public CustomAdapter(List<ItemsModel> itemsModelsl, Context context) {        this.itemsModelsl = itemsModelsl;        this.itemsModelListFiltered = itemsModelsl;        this.context = context;    }    @Override    public int getCount() {        return itemsModelListFiltered.size();    }    @Override    public Object getItem(int position) {        return itemsModelListFiltered.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(final int position, View convertView, ViewGroup parent) {        View view = getLayoutInflater().inflate(R.layout.row_items,null);        TextView names = view.findViewById(R.id.name);        TextView emails = view.findViewById(R.id.email);        ImageView imageView = view.findViewById(R.id.images);        names.setText(itemsModelListFiltered.get(position).getName());        emails.setText(itemsModelListFiltered.get(position).getEmail());        imageView.setImageResource(itemsModelListFiltered.get(position).getImages());        view.setOnClickListener(new View.OnClickListener() {            @Override            public void onClick(View v) {                Log.e("main activity","item clicked");                startActivity(new Intent(MainActivity.this,ItemsPreviewActivity.class).putExtra("items",itemsModelListFiltered.get(position)));            }        });        return view;    }    @Override    public Filter getFilter() {        Filter filter = new Filter() {            @Override            protected FilterResults performFiltering(CharSequence constraint) {                FilterResults filterResults = new FilterResults();                if(constraint == null || constraint.length() == 0){                    filterResults.count = itemsModelsl.size();                    filterResults.values = itemsModelsl;                }else{                    List<ItemsModel> resultsModel = new ArrayList<>();                    String searchStr = constraint.toString().toLowerCase();                    for(ItemsModel itemsModel:itemsModelsl){                        if(itemsModel.getName().contains(searchStr) || itemsModel.getEmail().contains(searchStr)){                            resultsModel.add(itemsModel);                        }                         filterResults.count = resultsModel.size();                            filterResults.values = resultsModel;                    }                }                return filterResults;            }            @Override            protected void publishResults(CharSequence constraint, FilterResults results) {                itemsModelListFiltered = (List<ItemsModel>) results.values;                notifyDataSetChanged();            }        };        return filter;    }}

}

You can get the whole tutorial here:ListView With Search/Filter and OnItemClickListener

Github Source Code