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Widget _buildBar(BuildContext context) {
	...
	icon: _searchIcon,
	onPressed: _searchPressed
	...	
}  

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  void _searchPressed() {
    setState(() {
      if (this._searchIcon.icon == Icons.search) {
        this._searchIcon = new Icon(Icons.close);
        this._appBarTitle = new TextField(
          controller: _filter,
          style: new TextStyle(color: Colors.white),
          decoration: new InputDecoration(
            prefixIcon: new Icon(Icons.search, color: Colors.white),
            fillColor: Colors.white,

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  _HomePageState() {
    _filter.addListener(() {
      if (_filter.text.isEmpty) {
        setState(() {
          _searchText = "";
          _resetRecords();
        });
      } else {
        setState(() {
          _searchText = _filter.text;

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  Widget _buildListItem(BuildContext context, Record record) {
    return Card(
      key: ValueKey(record.name),
      elevation: 8.0,
      margin: new EdgeInsets.symmetric(horizontal: 10.0, vertical: 6.0),
      child: Container(
        decoration: BoxDecoration(color: Color.fromRGBO(64, 75, 96, .9)),
        child: ListTile(
          contentPadding:
          EdgeInsets.symmetric(horizontal: 20.0, vertical: 10.0),

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  Widget _buildList(BuildContext context) {
    if (!(_searchText.isEmpty)) {
    _filteredRecords.records = new List();
      for (int i = 0; i < _records.records.length; i++) {
        if (_records.records[i].name.toLowerCase().contains(_searchText.toLowerCase())
            || _records.records[i].address.toLowerCase().contains(_searchText.toLowerCase())) {
          _filteredRecords.records.add(_records.records[i]);
        }
      }
    }

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  Widget _buildBar(BuildContext context) {
    return new AppBar(
      elevation: 0.1,
      backgroundColor: appDarkGreyColor,
      centerTitle: true,
      title: _appBarTitle,
      leading: new IconButton(
            icon: _searchIcon
      )
    );

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  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: _buildBar(context),
      backgroundColor: appDarkGreyColor,
      body: _buildList(context),
      resizeToAvoidBottomPadding: false,
    );
  }

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  @override
  void initState() {
    super.initState();

    _records.records = new List();
    _filteredRecords.records = new List();

    _getRecords();
  }
  

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  final TextEditingController _filter = new TextEditingController();

  RecordList _records = new RecordList();
  RecordList _filteredRecords = new RecordList();

  String _searchText = "";

  Icon _searchIcon = new Icon(Icons.search);

  Widget _appBarTitle = new Text(appTitle);

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import 'RecordList.dart';
import 'package:flutter/services.dart' show rootBundle;
import 'dart:convert';

class RecordService {

  Future<String> _loadRecordsAsset() async {
    return await rootBundle.loadString('assets/data/records.json');
  }