Question

我正在尝试创建一个显示来自SQLite数据库的书籍对象的Android应用程序。我正在尝试使用onItemClick为游标适配器创建一个on click侦听器。当用户点击列表的特定行时，我试图让图书的价格出现。但是我无法使用正确的语法来显示它。

这是我的BookListAdapter类

    public class BookListFragment extends ListFragment {

        private Bookstore mBookstore;
        private List<Book> mBooks;

        public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);

            ContentResolver resolver = this.getActivity().getContentResolver();
            Uri uri = Uri.parse("content://com.bookstore.app.model.BookContentProvider/books");
            Cursor cursor = resolver.query(uri, null, null, null, null);

            String[] from = new String[] {
                "title", "author", "year" 
            };
            int [] to = new int[] {
                R.id.list_item_book_title_textView,
                R.id.list_item_book_author_textView,
                R.id.list_item_book_year_textView
            };

        // CREATE THE ADAPTER USING THE CURSOR POINTING TO THE DATABASE
            SimpleCursorAdapter adapter = new SimpleCursorAdapter(
                    this.getActivity(), R.layout.list_item_book, cursor, from, to, 0);

            setListAdapter(adapter);

            Activity activity = getActivity();

            mBookstore = Bookstore.getInstance(activity);
            mBooks = mBookstore.getBooks();

            ListAdapter adapter1 = new BookListAdapter(activity, mBooks);

            setListAdapter(adapter1);



        }



    }

这是我的BooklistAdapter类

public class BookListAdapter extends ArrayAdapter<Book> implements ListAdapter {

    private Context mContext;
    private List<Book> mBooks;

    public BookListAdapter(Context context, List<Book> books) {
        super(context, R.layout.list_item_book, books);

        mContext = context;
        mBooks = books;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            // create a new list item view
            Activity activity = (Activity)mContext;
            LayoutInflater inflater = activity.getLayoutInflater();
            convertView = inflater.inflate(R.layout.list_item_book, null);
        }



        // customize layout for book
        Book bk = mBooks.get(position);

        TextView titleView = (TextView)convertView.findViewById(R.id.list_item_book_title_textView);
        TextView authorView = (TextView)convertView.findViewById(R.id.list_item_book_author_textView);
        TextView PriceView = (TextView)convertView.findViewById(R.id.list_item_book_price_textView);
        TextView yearView = (TextView)convertView.findViewById(R.id.list_item_book_year_textView);

        titleView.setText(bk.getTitle());
        authorView.setText(bk.getAuthor());
        yearView.setText("" + bk.getYear());

        return convertView;
    }

}

我不确定在哪里放一些像

这样的东西

 public void onItemClick(AdapterView<?> parent, View v, final int position)
    {
        Cursor cursor = (Cursor) adapter.getItem(position);
        yearView.setText("" + bk.getYear());
    }

以显示光标所针对的该行的特定价格。非常感谢任何帮助。

如果有任何混淆，请发表评论，我会澄清。

单击光标适配器

0 个答案: