Question

我正在创建一个在线食品订单应用程序，我在一个视图寻呼机中以单个片段（不是列表形式）显示单个项目但是当我尝试添加项目的数量时，则更改其他项目中的显示（即显示的更改）在其他片段）数量不在同一项目，因为有这么多项目。

如何管理每件商品的数量，以便更改在同一商品中显示而不是在其他商品中显示，而在此代码中产生问题的另一件事是我刷物品然后重置数量。我想知道如何在视图寻呼机片段中添加或删除单个项目的数量。

这是我的代码：

    public PlaceholderFragment() {
    }

    public static PlaceholderFragment newInstance(int position) {
        PlaceholderFragment fragment = new PlaceholderFragment();
        String itemTitle = foodItemTitle.get(position);
        String itemPrice = foodItemPrice.get(position);
        String itemImage = foodItemImage.get(position);

        Bundle args = new Bundle();
        args.putString("ITEMS", itemTitle);
        args.putString("PRICE", itemPrice);
        args.putString("IMAGE", itemImage);
        fragment.setArguments(args);
        return fragment;
    }
    public static void setContext( Activity activity) {
        context = activity;
    }
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_items_list, container, false);
        img = (ImageView) rootView.findViewById(R.id.section_label);
        pricePerItem = rootView.findViewById(R.id.price);
        nutri = rootView.findViewById(R.id.itemName);
        removeBtn=rootView.findViewById(R.id.removebtn);
        addBtn=rootView.findViewById(R.id.addBtn);
        quantity=rootView.findViewById(R.id.qty);
        String items = getArguments().get("ITEMS").toString();
        final String price = getArguments().get("PRICE").toString();
        String image = getArguments().get("IMAGE").toString();
        setItemDetails(items, price, image);
        addBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                countTtl = count + 1;
                int curntQty = Integer.parseInt(quantity.getText().toString()) + 1;
                Toast.makeText(getContext(), String.valueOf(curntQty), Toast.LENGTH_SHORT).show();
                quantity.setText(String.valueOf(curntQty));}});
        removeBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (quantity.getText().toString().equals("0")) {

                    Toast.makeText(getContext(), "Add Item First", Toast.LENGTH_SHORT).show();

                } else {

                    int qtyTtl = Integer.parseInt(quantity.getText().toString()) - 1;

                    quantity.setText(String.valueOf(qtyTtl));
                    Toast.makeText(getContext(), quantity.getText().toString(), Toast.LENGTH_SHORT).show(); }
            }
        });
        return rootView;
    }
}


private static void setItemDetails(String item, String price, String image) {
    String[] itemStr = item.split(",");
    String[] itemPriceStr = price.split(",");
    String[] imageStr = image.split(",");

    for (int i = 0; i < itemStr.length; i++) {

        String oneItem = itemStr[i].trim();
        oneItem = oneItem.replace("[", "");
        oneItem = oneItem.replace("]", "");
        nutri.setText(oneItem);
        String Price = itemPriceStr[i].trim();
        String perImage = imageStr[i].trim();

        Price = Price.replace("[", "");
        Price = Price.replace("]", "");
        pricePerItem.setText(Price);

        perImage = perImage.replace("[", "");
        perImage = perImage.replace("]", "");

    }

}


public class SectionsPagerAdapter extends FragmentPagerAdapter {

    public SectionsPagerAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int position) {
        // getItem is called to instantiate the fragment for the given page.
        // Return a PlaceholderFragment (defined as a static inner class below).
        return PlaceholderFragment.newInstance(position + 0);
    }

    @Override
    public int getCount() {
        // Show 3 total pages.
        return mFragmentList.size();
    }

    public void addFragment(Fragment fragment) {
        mFragmentList.add(fragment);
    }
@Override
 public int getItemPosition(Object object) {
return super.getItemPosition(object);}}

如果我添加片段的项目

，我想显示数量

Answer 1

如果我理解您的代码正确Joining, by = "id" Error: object 'y.id' not found并且您使用quantity=rootView.findViewById(R.id.qty);设置新数量，则只有当您的rootView包含多个片段时，数量才能指向不同的片段（并因此查看）。

如何在动态片段中添加食物量的量化？

1 个答案: