CustomAutoCompleteTextView

CustomAutoCompleteAdapter

public class CustomAutoCompleteAdapter extends ArrayAdapter<CustomModel> implements Filterable {

    private List<CustomModel> fullList;
    private List<CustomModel> mOriginalValues;
    private ArrayFilter mFilter;

    public CustomAutoCompleteAdapter(Context context, int resource, List<CustomModel> objects) {
        super(context, resource, objects);
        fullList = objects;
        mOriginalValues = new ArrayList<>(fullList);
        notifyDataSetChanged();
    }

    @Override
    public int getCount() {
        return fullList.size();
    }

    @Override
    public CustomModel getItem(int position) {
        return fullList.get(position);
    }

    @NonNull
    @Override
    public View getView(int position, View convertView, @NonNull ViewGroup parent) {
        TextView label = (TextView) super.getView(position, convertView, parent);
        label.setTextColor(Color.BLACK);
        if (fullList.get(position) != null) {
            CustomModel model = fullList.get(position);
            String value = model.getName()+" - "+model.getSpecification()+" - "+model.getMobile();
            label.setText(value);
        }
        return label;
    }

    @Override
    public View getDropDownView(int position, View convertView, @NonNull ViewGroup parent) {
        TextView label = (TextView) super.getView(position, convertView, parent);
        label.setTextColor(Color.BLACK);
        if (fullList.get(position) != null) {
            CustomModel model = fullList.get(position);
            String value = model.getName()+" - "+model.getSpecification()+" - "+model.getMobile();
            label.setText(value);
        }
        return label;
    }

    @NonNull
    @Override
    public Filter getFilter() {
        if (mFilter == null) {
            mFilter = new ArrayFilter();
        }
        return mFilter;
    }

    private class ArrayFilter extends Filter {
        //private Object lock;

        @Override
        protected FilterResults performFiltering(CharSequence prefix) {
            FilterResults results = new FilterResults();

            if (mOriginalValues == null) {
                /*synchronized (lock) {*/
                mOriginalValues = new ArrayList<>(fullList);
                //}
            }

            if (prefix == null || prefix.length() == 0) {
                /*synchronized (lock) {*/
                List<CustomModel> list = new ArrayList<>(mOriginalValues);
                results.values = list;
                results.count = list.size();
                //}
            } else {
                final String prefixString = prefix.toString().replaceAll("[^A-Za-z0-9]","").toLowerCase();
                List<CustomModel> values = mOriginalValues;
                int count = values.size();


                List<CustomModel> newValues = new ArrayList<>(count);

                for (int i = 0; i < count; i++) {
                    CustomModel item = values.get(i);

                    String itemConvert = item.getName().replaceAll("[^A-Za-z0-9]","").toLowerCase();
                    if (itemConvert.contains(prefixString)) {
                        newValues.add(item);
                    }
                }

                results.values = newValues;
                results.count = newValues.size();
            }

            return results;
        }

        @SuppressWarnings("unchecked")
        @Override
        protected void publishResults(CharSequence constraint, FilterResults results) {

            if (results.values != null) {
                fullList = (ArrayList<CustomModel>) results.values;
            } else {
                fullList = new ArrayList<>();
            }

            if (results.count > 0) {
                notifyDataSetChanged();
            } else {
                notifyDataSetInvalidated();
            }
        }
    }
}

CustomModel

public class CustomModel{


    // {"value":"8208","label":" ","Mobile":"0000000000","Specialization":"COORDINATOR"

    @SerializedName("value")
    private String id;

    @SerializedName("label")
    private String name;

    @SerializedName("Mobile")
    private String mobile;

    @SerializedName("Specialization")
    private String specification;

    public CustomModel(String id, String name, String mobile, String specification) {
        this.id = id;
        this.name = name;
        this.mobile = mobile;
        this.specification = specification;
    }

    public String getName() {
        return name;
    }

    public String getId() {
        return id;
    }

    public String getMobile() {
        return mobile;
    }

    public String getSpecification() {
        return specification;
    }
}

item_auto_complete

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:padding="@dimen/normal_padding"
    android:maxLines="2"
    android:textAppearance="@style/TextAppearance.AppCompat.Subhead"
    android:textColor="@color/grey_90"
    android:textSize="@dimen/textSize_15"
    tools:text="@tools:sample/cities" />

MainActivity

CustomAutoCompleteAdapter adapter = new CustomAutoCompleteAdapter(activity, R.layout.item_auto_complete, doctorList);
        autoCompleteView.setAdapter(adapter);
        autoCompleteView.setOnItemClickListener((adapterView, view, pos, id) -> {
            CustomModel item = (CustomModel) adapterView.getItemAtPosition(pos);
            autoCompleteView.setText(item.getName());
        });