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我使用SQLITE数据库来存储列表项和Baseadapter在我的应用程序中显示列表视图。更改数据库值后，listview不更新baseadapter内部
列表视图中的每个项目都具有编辑文本值，默认值为1. 当用户将值从1更改为2时，该值必须在数据库中更新。
此更新必须在Adapter内完成。
下面是适配器代码，我在其中更改编辑文本值。
public class CustomAdapter_cart extends BaseAdapter {
ArrayList<String> list_name = new ArrayList<String>();
ArrayList<String> list_price = new ArrayList<String>();
ArrayList<String> list_images = new ArrayList<String>();
ArrayList<String> list_model = new ArrayList<String>();
ArrayList<String> list_productid = new ArrayList<String>();
ArrayList<Integer> ids = new ArrayList<Integer>();
CustomAdapter_cart cart_refresh;
Bitmap b;
Context context;
AddToCart cart;
String value,name,price,image_new,model,product,qty;
private static LayoutInflater inflater = null;
Cursor cu;
String quant;
Holder holder = new Holder();
SharedPreferences sharedpreferences;
ArrayList<String>listMessages = new ArrayList<String>(new LinkedHashSet<String>());
ArrayList<String> quant_items = new ArrayList<String>();
Cursor mCursor;
ContentValues data=new ContentValues();
String model_item;
String id;
int id_final;
public CustomAdapter_cart(Context context, ArrayList<String> list_name, ArrayList<String> list_price, ArrayList<String> bitmapArray, ArrayList<String> list_model, ArrayList<String> list_productid,ArrayList<String> qty, ArrayList<Integer>ids) {
this.context = context;
this.list_name = list_name;
this.list_price = list_price;
this.list_images = bitmapArray;
this.list_model = list_model;
this.list_productid = list_productid;
this.quant_items = qty;
this.cart_refresh = this;
this.ids = ids;
inflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return list_name.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
public class Holder {
TextView tv_name, tv_price, tv_model,tv_product,tv_id;
ImageView image;
Button delete;
EditText quantity;
}
@Override
public View getView(final int position, View convertView, final ViewGroup parent) {
View rowView = convertView;
if (convertView == null) {
// TODO Auto-generated method stub
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
rowView = inflater.inflate(R.layout.list_items_cart, null);
holder.tv_name = (TextView) rowView.findViewById(R.id.name_cart);
holder.tv_price = (TextView) rowView.findViewById(R.id.price_cart);
holder.image = (ImageView) rowView.findViewById(R.id.image_cart);
holder.tv_model = (TextView) rowView.findViewById(R.id.model_cart);
holder.tv_product = (TextView) rowView.findViewById(R.id.product_cart);
holder.delete = (Button) rowView.findViewById(R.id.delete);
holder.quantity = (EditText) rowView.findViewById(R.id.quantity);
holder.tv_id = (TextView)rowView.findViewById(R.id.ids);
rowView.setTag(holder);
}
else
holder = (Holder) rowView.getTag();
holder.tv_name.setText(list_name.get(position));
name = holder.tv_name.getText().toString();
holder.tv_price.setText(list_price.get(position));
price = holder.tv_price.getText().toString();
holder.tv_model.setText(list_model.get(position));
model = holder.tv_model.getText().toString();
holder.tv_product.setText(list_productid.get(position));
product = holder.tv_product.getText().toString();
holder.quantity.setText(quant_items.get(position));
quant = holder.quantity.getText().toString();
holder.tv_id.setText(Integer.toString(ids.get(position)));
id = holder.tv_id.getText().toString();
id_final = Integer.parseInt(id);
holder.image.setImageBitmap(loadImageFromStorage(list_images.get(position)));
image_new = holder.image.toString();
final View finalRowView1 = rowView;
holder.quantity.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
value = s.toString();
quant.replace(quant, value);
updateTable();
Toast.makeText(finalRowView1.getContext(), "Updating Table", Toast.LENGTH_SHORT).show();
}
});
final View finalRowView = rowView;
rowView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String name_item = ((TextView) finalRowView.findViewById(R.id.name_cart)).getText().toString();
String price_item = ((TextView) finalRowView.findViewById(R.id.price_cart)).getText().toString();
model_item = ((TextView) finalRowView.findViewById(R.id.model_cart)).getText().toString();
Intent in = new Intent(context, AddCart_FullImage.class);
in.putExtra("model", model_item);
in.putExtra("name", name_item);
in.putExtra("price", price_item);
context.startActivity(in);
}
});
return rowView;
}
private Bitmap loadImageFromStorage(String path) {
try {
File f = new File(path, "");
f.canRead();
b = BitmapFactory.decodeStream(new FileInputStream(f));
return b;
} catch (FileNotFoundException e) {
e.printStackTrace();
}
return null;
}
public void updateTable() {
final DatabaseHandler db = new DatabaseHandler(context);
SQLiteDatabase db1 = db.getWritableDatabase();
try {
db.updateContact(new Cart(id_final,name, price, image_new, model, product, value));
Log.v("LOG", "After text change value db " + value);
} catch (Exception e) {
}
}
}
问题
当我尝试更新的编辑文本值，它在数据库被更新，但它再次更改为默认值“1”。
我不知道我哪里出错了。
任何帮助都会非常棒。
谢谢。
你是什么意思与“但又改变为默认值”？你在谈论用户界面？ – thetonrifles
默认值是已经存储在数据库中的值。在我的情况下，它是1. – Ramz
呃...所以我不明白...你的意思是说，数据库没有更新？对不起，如果我做了愚蠢的问题，但我不明白，如果你的问题涉及存储或用户界面。 – thetonrifles