Custom AutoCompleteTextView

Custom AutoCompleteTextView

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <AutoCompleteTextView
        android:id="@+id/actv"
        android:completionThreshold="1"
        android:hint="Select a country"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />


</LinearLayout>

public class MainActivity extends AppCompatActivity {

    private List<CountryItem> countryList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fillCountryList();

        AutoCompleteTextView editText = findViewById(R.id.actv);
        AutoCompleteAdapter adapter = new AutoCompleteAdapter(this, countryList);
        editText.setAdapter(adapter);

    }

    private void fillCountryList() {

        countryList = new ArrayList<>();
        countryList.add(new CountryItem("Afghanistan", R.drawable.screenshot_11));
        countryList.add(new CountryItem("albanaia", R.drawable.screenshot_12));
        countryList.add(new CountryItem("Algeria", R.drawable.screenshot_13));
        countryList.add(new CountryItem("Korea", R.drawable.screenshot_11));

    }


}

public class CountryItem {
    private String countryName;
    private int flagImage;

    public CountryItem(String countryName, int flagImage) {
        this.countryName = countryName;
        this.flagImage = flagImage;
    }

    public String getCountryName() {
        return countryName;
    }

    public int getFlagImage() {
        return flagImage;
    }

}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="4dp"
    xmlns:tools="http://schemas.android.com/tools">

    <ImageView
        android:id="@+id/image_view_flag"
        tools:src="@drawable/screenshot_12"
        android:layout_width="60dp"
        android:layout_height="40dp" />

    <TextView
        android:id="@+id/text_view_name"
        android:layout_gravity="center_vertical"
        android:paddingStart="8dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textAppearance="?android:attr/textAppearanceListItemSmall"
        tools:text="korea"/>

</LinearLayout>

class AutoCompleteAdapter extends ArrayAdapter<CountryItem> {

    private List<CountryItem> countryListFull;

    public AutoCompleteAdapter(@NonNull Context context, @NonNull List<CountryItem> countryList) {
        super(context, 0, countryList);
        countryListFull = new ArrayList<>(countryList);
    }

    @NonNull
    @Override
    public Filter getFilter() {
        return countryFilter;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {

        if (convertView == null) {
            convertView = LayoutInflater.from(getContext()).inflate(
                    R.layout.country_autocomplete_row, parent, false
            );
        }

        TextView textView = convertView.findViewById(R.id.text_view_name);
        ImageView imageView = convertView.findViewById(R.id.image_view_flag);

        CountryItem countryItem = getItem(position);

        if (countryItem != null) {
            textView.setText(countryItem.getCountryName());
            imageView.setImageResource(countryItem.getFlagImage());
        }
        return convertView;
    }

    private Filter countryFilter = new Filter() {
        @Override
        protected FilterResults performFiltering(CharSequence constraint) {

            FilterResults results = new FilterResults();
            List<CountryItem> suggestions = new ArrayList<>();

            if (constraint == null || constraint.length() == 0) {
                suggestions.addAll(countryListFull);
            } else {
                String filterPattern = constraint.toString().toLowerCase().trim();

                for (CountryItem item : countryListFull) {
                    if (item.getCountryName().toLowerCase().contains(filterPattern)) {
                        suggestions.add(item);
                    }
                }
            }

            results.values = suggestions;
            results.count = suggestions.size();

            return results;
        }

        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {
            clear();
            addAll((List) results.values);
            notifyDataSetChanged();
        }

        @Override
        public CharSequence convertResultToString(Object resultValue) {
            return ((CountryItem) resultValue).getCountryName();
        }
    };


}