我正在尝试从SQLite中获取数据然后我想在我的ListView上显示它,我想我很困惑或误解了如何正确地做到这一点......我做过的事情是:
1. - 从Insert
Table
创建一个SQLite
(这是有效的)。
db.execSQL("INSERT INTO T_OFERTA VALUES (1, 1, 'Offer1', 30, '2x1', '30, 10-1-2013', '1-1-2013', 'Descripció del producte pew', 1, 'http://www.canon.es/Images/Android-logo_tcm86-1232684.png')");
2. - 在我创建的ListFragment
上:1 ImageView
,3 Strings
和1 Integer
。之所以这是因为我的Adapter
我需要Drawable
,String
和Integer
。
ImageView FOTO;
String Title, percent, data_f;
Integer Preu;
3.-我制作了一个这样的光标:
Cursor c;
c = db.rawQuery("Select NOM_OFER,PREU_OFERTA,DATA_F,FOTO, PERCENTDESCOMPTE from T_OFERTA", null);
c.moveToFirst();
if (c != null) {
do {
for (int i = 0; i < c.getColumnCount(); i++) {
Title = c.getString((c.getColumnIndex("NOM_OFER")));
Preu = c.getColumnIndex("PREU_OFERTA");
percent = c.getString((c.getColumnIndex("PERCENTDESCOMPTE")));
data_f = c.getString((c.getColumnIndex("DATA_F")));
FOTO = c.getString((c.getColumnIndex("FOTO"))); // <--- Error because FOTO it's an ImageView....
Log.e("", "" + c.getString(i));
Toast.makeText(getActivity(), "Title" + Title + "Preu" + Preu + "Percent" + percent + "Cheese is " + data_f, Toast.LENGTH_LONG).show();
}
}while (c.moveToNext());
}
c.close();
现在我要将变量的数据放在:
中mItems.add(new ListViewItem(resources.getDrawable(R.drawable.zumo_oferta), getString(R.string.pew), getString(R.string.pew_precio), getString(R.string.pew_descuento), getString(R.string.pew_data)));
我的ListViewItem
课程如下:
public class ListViewItem {
public final Drawable icon; // the drawable for the ListView item ImageView
public final String title; // the text for the ListView item title
public final String precio; // the price for the ListView item
public final String descuento; // the price for the discount for the ListView item
public final String date; //the date for the sale for the ListView item
// the text for the ListView item description
public ListViewItem(Drawable icon, String title, String precio, String descuento, String date) {
this.icon = icon;
this.title = title;
this.precio = precio;
this.descuento = descuento;
this.date = date;
}
}
我的ListViewDemoAdapter
看起来像:
public class ListViewDemoAdapter extends ArrayAdapter<ListViewItem> {
public ListViewDemoAdapter(Context context, List<ListViewItem> items) {
super(context, R.layout.listview_item, items);
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder viewHolder;
if(convertView == null) {
// inflate the GridView item layout
LayoutInflater inflater = LayoutInflater.from(getContext());
convertView = inflater.inflate(R.layout.listview_item, parent, false);
// initialize the view holder
viewHolder = new ViewHolder();
viewHolder.ivIcon = (ImageView) convertView.findViewById(R.id.ivIcon);
viewHolder.tvTitle = (TextView) convertView.findViewById(R.id.tvTitle);
viewHolder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);
viewHolder.tvDiscount = (TextView) convertView.findViewById(R.id.tvDiscount);
viewHolder.tvDate = (TextView) convertView.findViewById(R.id.tvDatas);
convertView.setTag(viewHolder);
} else {
// recycle the already inflated view
viewHolder = (ViewHolder) convertView.getTag();
}
// update the item view
ListViewItem item = getItem(position);
viewHolder.ivIcon.setImageDrawable(item.icon);
viewHolder.tvTitle.setText(item.title);
viewHolder.tvDiscount.setText(item.descuento);
viewHolder.tvPrice.setText(item.precio);
viewHolder.tvDate.setText(item.date);
return convertView;
}
private static class ViewHolder {
ImageView ivIcon;
TextView tvTitle;
TextView tvDiscount;
TextView tvPrice;
TextView tvDate;
}
}
这是因为我想查看提取是否正确。
我没有使用任何BaseAdapter
,也没有使用BitMapAdapter
,因为我要使用网址设置为ImageView
我不知道是否会有用,那么我的问题是,我可以按照我现在这样做的方式来做,或者我应该创建一个BitMapAdater
而不是Drawable
?如果我通过这种方式,我不能使用我得到的字符串作为“FOTO” - &gt;图片,因为它不是Drawable
而且是String
...
您是否可以指导我正确执行此操作,因为它只是一个测试,现在我想用我的SQLite数据设置ListView。
如果您不理解我的问题或只是需要更多代码,请告诉我,我会尽快回复您。
答案 0 :(得分:1)
我改变了以下内容:
为方便起见,请在检索时创建ListViewItem
:
ArrayList myItems = new ArrayList<ListViewItem>();
for (int i = 0; i < c.getColumnCount(); i++) {
Title = c.getString((c.getColumnIndex("NOM_OFER")));
Preu = c.getColumnIndex("PREU_OFERTA");
percent = c.getString((c.getColumnIndex("PERCENTDESCOMPTE")));
data_f = c.getString((c.getColumnIndex("DATA_F")));
// create and add your items as they are retrieved from the db
myItems.add(new ListViewItem(...,Title, Preu, percent, data_f));
...
} ...
现在您已经从数据库中获取了所有项目,您可以轻松地将它们传递到ListView
/ adapter
:
myAdapter = new ListViewDemoAdapter(getActivity(), myItems);
setListAdapter(myAdapter);
我不会在Drawable
中存储ListViewItem
,而只是将资源ID存储为整数:
int icon = R.drawable.example_icon;
然后在适配器getView()
方法中处理转换为实际图像资源:
ivIcon.setImageResource(item.icon);