androidautocompletetextview

Change AutoCompleteTextView filter from "startsWith" to "Contains"?


I would like to change the default filtering in AutoCompleteTextView. The default filtering finds all strings that startsWith the given token. My project requires that the filtering should find all strings that contains the given token.

Is it possible?


Solution

  • I found a solution for that, thanks to Google and searching for two days. As @torque203 suggested, I've implemented my own custom Adapter. First define a new XML file to custom Item in the adapter:

    autocomplete_item.xml

    <?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="Medium Text"
            android:paddingLeft="8dp"
            android:paddingRight="8dp"
            android:paddingTop="16dp"
            android:paddingBottom="16dp"
            android:id="@+id/lbl_name" />
    </RelativeLayout>
    

    Create new class for your Names:

    Names

    public class Names {
        public String name;
    }
    

    NamesAdapter

    public class NamesAdapter extends ArrayAdapter<Names> {
    
        Context context;
        int resource, textViewResourceId;
        List<Names> items, tempItems, suggestions;
    
        public NamesAdapter(Context context, int resource, int textViewResourceId, List<Names> items) {
            super(context, resource, textViewResourceId, items);
            this.context = context;
            this.resource = resource;
            this.textViewResourceId = textViewResourceId;
            this.items = items;
            tempItems = new ArrayList<Names>(items); // this makes the difference.
            suggestions = new ArrayList<Names>();
        }
    
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View view = convertView;
            if (convertView == null) {
                LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                view = inflater.inflate(R.layout.autocomplete_item, parent, false);
            }
            Names names = items.get(position);
            if (names != null) {
                TextView lblName = (TextView) view.findViewById(R.id.lbl_name);
                if (lblName != null)
                    lblName.setText(names.name);
            }
            return view;
        }
    
        @Override
        public Filter getFilter() {
            return nameFilter;
        }
    
        /**
         * Custom Filter implementation for custom suggestions we provide.
         */
        Filter nameFilter = new Filter() {
            @Override
            public CharSequence convertResultToString(Object resultValue) {
                String str = ((Names) resultValue).name;
                return str;
            }
    
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                if (constraint != null) {
                    suggestions.clear();
                    for (Names names : tempItems) {
                        if (names.name.toLowerCase().contains(constraint.toString().toLowerCase())) {
                            suggestions.add(names);
                        }
                    }
                    FilterResults filterResults = new FilterResults();
                    filterResults.values = suggestions;
                    filterResults.count = suggestions.size();
                    return filterResults;
                } else {
                    return new FilterResults();
                }
            }
    
            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {
                List<Names> filterList = (ArrayList<Names>) results.values;
                if (results != null && results.count > 0) {
                    clear();
                    for (Names names : filterList) {
                        add(names);
                        notifyDataSetChanged();
                    }
                }
            }
        };
    }
    

    SearchActivity (or your main activity)

    ....
       List<Names> namesList =  //your names list;
       NamesAdapter namesAdapter = new NamesAdapter(
                        SearchActivity.this,
                        R.layout.activity_search,
                        R.id.lbl_name,
                        namesList
                );
                //set adapter into listStudent
                autoCompleteTextView.setAdapter(namesAdapter);
                autoCompleteTextView.showDropDown();
    ...