java - 如何更新选项卡中的 ListView ？

Question

我的应用程序中有两个选项卡，这些选项卡中有 ListView 。

我为每个 ListView 设置了列表数据。

我想删除表单列表，并在单击 [x] 图像时从 ListView 中删除。

项目从列表中删除在我的代码中，但我不知道如何更新 ListView ，我在我的自定义适配器中使用了 notifyDataSetChanged()，但没有更新。

第一个标签的 Activity :

public static List<Product> mCartList;
mCartList = AllProducts.getCartList();
        listViewCatalog = (ListView) findViewById(R.id.my_order_list);
        mProductAdapter = new CustomListAdapter(MyOrders.this, mCartList, "", true);
        listViewCatalog.setAdapter(mProductAdapter);

我的自定义列表适配器:

public class CustomListAdapter extends BaseAdapter {

    private LayoutInflater layoutInflater;
    private Context mContext;
    private List<Product> mProductList;
    private String mType;
    private boolean mShowQuantity;

    public CustomListAdapter(Context context, List<Product> list, String type, boolean showQuantity) {
        layoutInflater = LayoutInflater.from(context);
        mContext = context;
        mProductList = list;
        mShowQuantity = showQuantity;
        mType = type;
    }

    @Override
    public int getCount() {
        return mProductList.size();
    }

    @Override
    public Object getItem(int position) {
        return mProductList.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup parent) {
        final ViewHolder item;
        final int finalMPosition = position;
        if (convertView == null) {
            convertView = layoutInflater.inflate(R.layout.list_row, null);
            item = new ViewHolder();

            item.imageView = (ImageView) convertView.findViewById(R.id.product_image);
            item.name = (TextView) convertView.findViewById(R.id.name);
            item.pid = (TextView) convertView.findViewById(R.id.pid);
            item.price = (TextView) convertView.findViewById(R.id.price);
            item.description = (TextView) convertView.findViewById(R.id.description);

            item.removeProduct = (ImageView) convertView.findViewById(R.id.removeProduct);
            item.addToCart = (TextView) convertView.findViewById(R.id.addtocard);
            item.productQuantity = (TextView) convertView.findViewById(R.id.textViewQuantity);

            convertView.setTag(item);
        } else {
            item = (ViewHolder) convertView.getTag();
        }

        final Product curProduct = mProductList.get(position);
        item.imageView.setImageDrawable(curProduct.imageView);
        item.name.setText(curProduct.name);
        item.pid.setText(curProduct.pid);
        int length = curProduct.description.length();
        int start = 0, end = length;
        if (length >= 40) {
            start = 0;
            end = 40;
        }
        String s = curProduct.description.substring(start, end);
        item.description.setText(s + "...");
        item.price.setText(curProduct.price + mContext.getString(R.string.currency));


        if (mShowQuantity) {
            item.addToCart.setVisibility(View.GONE);
//            item.productQuantity.setText("Quantity: " + AllProducts.getProductQuantity(curProduct));
            item.productQuantity.setVisibility(View.GONE);
        } else {
            item.productQuantity.setVisibility(View.GONE);
            item.removeProduct.setVisibility(View.GONE);
        }
        item.removeProduct.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AlertDialog.Builder ab = new AlertDialog.Builder(mContext);
                ab.setTitle("Delete ");
                ab.setMessage("This product will be deleted from list.").setPositiveButton("Delete", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        curProduct.selected = false;
                        AllProducts.removeProduct(curProduct);
                        notifyDataSetChanged();
                        notifyDataSetInvalidated();
                    }
                }).setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {

                    }
                });
                ab.create().show();
            }
        });

        item.addToCart.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent productDetailsIntent = new Intent(mContext, ProductDetail.class);
                productDetailsIntent.putExtra(AllProducts.PRODUCT_INDEX, finalMPosition);
                productDetailsIntent.putExtra("type", mType);
                mContext.startActivity(productDetailsIntent);
            }
        });

        return convertView;
    }

    public class ViewHolder {
        TextView pid;
        TextView addToCart;
        TextView name;
        TextView price;
        TextView description;
        ImageView imageView;
        ImageView removeProduct;
        TextView productQuantity;
    }
}

Answer 1

您可以在 ListView 中引入 notifyDataSetChanged() 或者您可以重置新列表值的 setAdapter() ，但以后的成本会很高