Question

首先抱歉，如果标题不适合我的情况，首先我在片段中有一个列表视图，其中有一个适配器类组件，我的列表看起来像这个，如果我单击菜单项它将通过在那个小橙色框中显示的每次点击来增加数量，我的问题是当我滚动此列表甚至更改活动时它不会保存我这样做的点击数量是支持0，我只需要将此单击操作保存为这是我的适配器类

package abtech.waiteriano.com.waitrer.adapters;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.RelativeLayout;
import android.widget.TextView;

import java.util.ArrayList;

import abtech.waiteriano.com.waitrer.R;
import abtech.waiteriano.com.waitrer.fragments.LVMenuFragment;

/**
 * Created by dell on 3/7/2017.
 */

public class CustomMenuLVAdapter extends BaseAdapter {
    ArrayList<String> resultMenuItems;
    LVItemHolder lvItemHolder;
    Context context;
    private static LayoutInflater inflater = null;

    public CustomMenuLVAdapter(LVMenuFragment lvMenuFragment, ArrayList<String> listMenuArray) {
        resultMenuItems = listMenuArray;
        context = lvMenuFragment.getActivity();
        inflater = (LayoutInflater) context.
                getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }

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

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

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

    public class LVItemHolder {
        TextView listMenuTV, txtQTY;
        RelativeLayout qtyView;
        Button minusBtn;
    }

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final LVItemHolder lvItemHolder = new LVItemHolder();
        View rowView;
        rowView = inflater.inflate(R.layout.menu_list_item, null);
        lvItemHolder.listMenuTV = (TextView) rowView.findViewById(R.id.menulistTV2);
        lvItemHolder.txtQTY = (TextView) rowView.findViewById(R.id.txtQTY);
        lvItemHolder.minusBtn = (Button) rowView.findViewById(R.id.minusBtn);
        lvItemHolder.listMenuTV.setText(resultMenuItems.get(position));
        lvItemHolder.txtQTY.setText("0");
        rowView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int q = 0;
                q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
                q++;
                lvItemHolder.txtQTY.setText("" + q);
//                Toast.makeText(context, "You Clicked "+resultMenuItems.get(position), Toast.LENGTH_LONG).show();
            }
        });
        lvItemHolder.minusBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                int q = 0;
                q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
                if (q > 0)
                    q--;
                lvItemHolder.txtQTY.setText("" + q);
            }
        });
        return rowView;
    }
}

这是我的活动

package abtech.waiteriano.com.waitrer.fragments;

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;

import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

import abtech.waiteriano.com.waitrer.MenuActivity;
import abtech.waiteriano.com.waitrer.R;
import abtech.waiteriano.com.waitrer.adapters.CustomMenuLVAdapter;
import abtech.waiteriano.com.waitrer.connection_class.ConnectionClass;

public class LVMenuFragment extends android.app.Fragment {
    View rootView;
    ListView menuListView;
    public static ArrayList<String> listMenuArray = new ArrayList<String>();


    public LVMenuFragment() {
        // Required empty public constructor
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        rootView = inflater.inflate(R.layout.fragment_lvmenu, container, false);
        menuListView=(ListView) rootView.findViewById(R.id.listView);
        listMenuArray.clear();
       String menuListSTR = "";
        if (MenuActivity.Prst_ID.trim() == "-1")
            menuListSTR = "Select ID,Code,Name,Name2 From Presets Where Active = 1 And Rest_ID_Active = 1 AND OutLet_ID_Active = 1 ORDER BY Code";
        else
            menuListSTR = "select dbo.MenuItems.Item_ID, dbo.Items.Code, dbo.Items.Name, dbo.Items.Name2, dbo.Items.PrintOnChick, dbo.Items.Taxable, dbo.Items.NoServiceCharge, dbo.Items.PrintOnReport,Case { fn IFNULL ((SELECT Price_Value FROM dbo.ItemsPrices WHERE (PriceLVL_ID = 1) AND (Item_ID = dbo.Items.ID)), 0) } when 0 then dbo.Items.StaticPrice Else { fn IFNULL ((SELECT Price_Value FROM dbo.ItemsPrices WHERE (PriceLVL_ID = 1) AND (Item_ID = dbo.Items.ID)), dbo.Items.StaticPrice) } END AS Price From dbo.MenuItems LEFT OUTER JOIN dbo.Items ON dbo.MenuItems.Item_ID = dbo.Items.ID Where  (dbo.MenuItems.Preset_ID = " + MenuActivity.Prst_ID + ") AND (dbo.MenuItems.Rest_ID_Active = " + ConnectionClass.Rest_ID + ") AND (dbo.MenuItems.OutLet_ID_Active = " + ConnectionClass.OutletID + ") AND (dbo.Items.Active = 1) ORDER BY dbo.MenuItems.SortNumber";

        ResultSet rs = ConnectionClass.Ret_RS(menuListSTR);
        try {
            while (rs.next()) {
                listMenuArray.add(rs.getString("Name"));

            }
        } catch (SQLException e) {
            e.printStackTrace();
        }
        menuListView.setAdapter(new CustomMenuLVAdapter(this,listMenuArray));

        return rootView;
    }

}

对不起，如果有任何不清楚的话

Answer 1

使用此

public class CustomMenuLVAdapter extends BaseAdapter {
ArrayList<String> resultMenuItems;
LVItemHolder lvItemHolder;
Context context;
private static LayoutInflater inflater = null;

HashMap<Integer, Integer> map = new HashMap<>;

public CustomMenuLVAdapter(LVMenuFragment lvMenuFragment, ArrayList<String> listMenuArray) {
    resultMenuItems = listMenuArray;
    context = lvMenuFragment.getActivity();
    inflater = (LayoutInflater) context.
            getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}

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

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

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

public class LVItemHolder {
    TextView listMenuTV, txtQTY;
    RelativeLayout qtyView;
    Button minusBtn;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {
    final LVItemHolder lvItemHolder = new LVItemHolder();
    View rowView;
    rowView = inflater.inflate(R.layout.menu_list_item, null);
    lvItemHolder.listMenuTV = (TextView) rowView.findViewById(R.id.menulistTV2);
    lvItemHolder.txtQTY = (TextView) rowView.findViewById(R.id.txtQTY);
    lvItemHolder.minusBtn = (Button) rowView.findViewById(R.id.minusBtn);
    lvItemHolder.listMenuTV.setText(resultMenuItems.get(position));

    if(map.containsKey(position)){
          lvItemHolder.txtQTY.setText(""+map.get(position));
    }else{
        lvItemHolder.txtQTY.setText("0");
     } 

    rowView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int q = 0;
            q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
            q++;
            lvItemHolder.txtQTY.setText("" + q);
           map.put(position,q)
           //                Toast.makeText(context, "You Clicked "+resultMenuItems.get(position), Toast.LENGTH_LONG).show();
        }
    });
    lvItemHolder.minusBtn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            int q = 0;
            q = Integer.valueOf(lvItemHolder.txtQTY.getText().toString());
            if (q > 0)
                q--;
            lvItemHolder.txtQTY.setText("" + q);
            map.put(position,q)
        }
    });
    return rowView;
}

Answer 2

适配器中的

具有以下功能作为示例;

public void setNumber(int number) {this.number = number}

然后当用户点击某个项目以增加它时，您可以通过调用此setNumber函数来保存它。

resultMenuItems.get(position).setNumber(//you number inputed here//);
//Then call notifydatasetChanged on your adapter//

确保通过apater中的getter函数获取该数字。

我希望这是有道理的

单击列表项后如何保存步骤

2 个答案: