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            new TextField(
              decoration: new InputDecoration(
                hintText: 'Choose a book',
              ),
              onChanged: (string) => (subject.add(string)),
            ),

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            new Expanded(
              child: new ListView.builder(
                padding: new EdgeInsets.all(8.0),
                itemCount: _items.length,
                itemBuilder: (BuildContext context, int index) {
                  return new Card(
                    child: new Padding(
                        padding: new EdgeInsets.all(8.0),
                        child: new Row(
                          children: <Widget>[

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  @override
  void initState() {
    super.initState();
    subject.stream.debounce(new Duration(milliseconds: 600)).listen(_textChanged);
  }

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  void _addBook(dynamic book) {
    setState(() {
      _items.add(new Book(book["volumeInfo"]["title"], book["volumeInfo"]["imageLinks"]["smallThumbnail"]));
    });
  }

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  void _textChanged(String text) {
    if(text.isEmpty) {
      setState((){_isLoading = false;});
      _clearList();
      return;
    }
    setState((){_isLoading = true;});
    _clearList();
    http.get("https://www.googleapis.com/books/v1/volumes?q=$text")
        .then((response) => response.body)

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class BookDatabase {
  static final BookDatabase _bookDatabase = new BookDatabase._internal();

  final String tableName = "Books";

  Database db;

  static BookDatabase get() {
    return _bookDatabase;
  }

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  /// Get a book by its id, if there is not entry for that ID, returns null.
  Future<Book> getBook(String id) async{
    var result = await db.rawQuery('SELECT * FROM $tableName WHERE ${Book.db_id} = "$id"');
    if(result.length == 0)return null;
    return new Book.fromMap(result[0]);
  }

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  /// Inserts or replaces the book.
  Future updateBook(Book book) async {
    await db.inTransaction(() async {
      await db.rawInsert(
          'INSERT OR REPLACE INTO '
              '$tableName(${Book.db_id}, ${Book.db_title}, ${Book.db_url}, ${Book.db_star}, ${Book.db_notes})'
              ' VALUES("${book.id}", "${book.title}", "${book.url}", ${book.starred? 1:0}, "${book.notes}")');
    });
  }

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class BookCard extends StatefulWidget {


  BookCard(this.book);

  final Book book;

  @override
  State<StatefulWidget> createState() => new BookCardState();

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class BookCardState extends State<BookCard> {

  Book bookState;


  @override
  void initState() {
    super.initState();
    bookState = widget.book;