Java 设置值​；从头开始

如果我单击按钮

CHECKOUT

，将显示一个弹出窗口。在此弹出窗口中，您有机会中止事务。因此，如果您中止事务，则项目（法国火、水、汉堡）的所有值应再次为0，如下图所示。现在，当我中止事务时，这些值保持我以前配置它们的方式。你能帮我吗

OrderActivity.java

package com.nfc.netvision;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.app.Dialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.auth.FirebaseAuth;

import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Locale;

import static android.widget.Toast.*;

public class OrderActivity extends AppCompatActivity implements OrderAdapter.TotalListener {

    RecyclerView recyclerView;
    ArrayList<ModelOrder> orderArrayList;
    TextView textView_order_price;
    TextView textView_order_count;
    Dialog epicDialog;
    Button btnCheckout;
    Button btnAbort;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_order);

        recyclerView = findViewById(R.id.recyclerview_order_scroll);
        textView_order_price = findViewById(R.id.textView_order_price);
        textView_order_count = findViewById(R.id.textView_order_count);
        btnCheckout = (Button) findViewById(R.id.btnCheckout);


        orderArrayList = new ArrayList<>();
        orderArrayList.add(new ModelOrder(R.drawable.coke, "Coka Cola", "Eine Cola hält dich wach und schmeckt dazu.", "3",0));
        orderArrayList.add(new ModelOrder(R.drawable.fastfood, "Pommes", "Fritten für die Titten.", "5",0));
        orderArrayList.add(new ModelOrder(R.drawable.water, "Wasser", "Still und sanft, so mag ich es.", "5",0));
        orderArrayList.add(new ModelOrder(R.drawable.burger, "Burger", "Ach mir fällt nichts ein.", "10",0));

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        RecyclerView.LayoutManager recLiLayoutManager = layoutManager;

        recyclerView.setLayoutManager(recLiLayoutManager);

        OrderAdapter adapter = new OrderAdapter(this, orderArrayList, this);

        recyclerView.setAdapter(adapter);

        epicDialog = new Dialog(this);

        btnCheckout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showWaitingPopUp();


            }
        });



    }

    private void showWaitingPopUp() {
        epicDialog.setContentView(R.layout.order_popup_waiting);
        epicDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        btnAbort = (Button) epicDialog.findViewById(R.id.btnAbort);
        btnAbort.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               epicDialog.dismiss();
            }
        });
        epicDialog.show();
    }


    @Override
    public void onTotalChanged(String result) {
        NumberFormat n = NumberFormat.getCurrencyInstance(Locale.GERMANY);
        textView_order_price.setText( n.format(Integer.parseInt(result)));
    }

    @Override
    public void onCountChanged(String result) {
        textView_order_count.setText(result);

    }
}

package com.nfc.netvision;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;


import org.w3c.dom.Text;

import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Locale;


public class OrderAdapter extends RecyclerView.Adapter<OrderAdapter.ViewHolder> {

    private int totalAmount;
    private int totalItems;
    private Context mContext;
    private ArrayList<ModelOrder> nList;

    private TotalListener listener;

    interface TotalListener{
        void onTotalChanged(String result);
        void onCountChanged(String result);

    }
    OrderAdapter(Context context, ArrayList<ModelOrder> list, TotalListener listener) {
        mContext = context;
        nList = list;
        this.listener = listener;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        View view = layoutInflater.inflate(R.layout.recyclerview_order_items, parent, false);

        ViewHolder viewHolder = new ViewHolder(view);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {

        final ModelOrder orderItem = nList.get(position);
        ImageView image = holder.item_image;
        final TextView name, place, price;
        name = holder.item_name;
        place = holder.item_place;
        price = holder.item_price;

        image.setImageResource(orderItem.getImage());

        name.setText(orderItem.getName());
        place.setText(orderItem.getPlace());
        price.setText(orderItem.getPrice());


        holder.order_item_minus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(orderItem.getCounter() > 0) {
                    orderItem.setCounter(orderItem.getCounter()-1);
                    holder.order_item_count.setText("" + orderItem.getCounter());
                    calculatePrice(Integer.parseInt((String) price.getText()), false);
                    countItems(orderItem.getCounter(), false);

                }

            }
        });

        holder.order_item_plus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(orderItem.getCounter() < 9) {
                    orderItem.setCounter(orderItem.getCounter() + 1);
                    holder.order_item_count.setText("" + orderItem.getCounter());
                    calculatePrice(Integer.parseInt((String) price.getText()), true);
                    countItems(orderItem.getCounter(), true);
                }
            }
        });




    }

    @Override
    public int getItemCount() {
        return nList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        ImageView item_image;
        TextView item_name, item_place, item_price,order_item_minus,order_item_count, order_item_plus;

        public ViewHolder(@NonNull View itemView) {

            super(itemView);
            item_image = itemView.findViewById(R.id.order_item_image);
            item_name = itemView.findViewById(R.id.order_item_name);
            item_place = itemView.findViewById(R.id.order_item_place);
            item_price = itemView.findViewById(R.id.order_item_price);
            order_item_minus = itemView.findViewById(R.id.order_item_minus);
            order_item_plus = itemView.findViewById(R.id.order_item_plus);
            order_item_count = itemView.findViewById(R.id.order_item_count);
        }
    }

    private void calculatePrice(int pPrice, boolean pUpDown) {
        if(pUpDown) {
            totalAmount = totalAmount + pPrice;
        }
        else {
            totalAmount = totalAmount - pPrice;
        }

        listener.onTotalChanged(totalAmount+ "");
    }

    private void countItems(int pCounter, boolean pUpDown){
        if (pUpDown){
            totalItems = totalItems + 1;
        }
        else{
            totalItems = totalItems - 1;
        }
        listener.onCountChanged(totalItems+ "");

    }


}

package com.nfc.netvision；
导入androidx.appcompat.app.appcompat活动；
导入androidx.recyclerview.widget.LinearLayoutManager；
导入androidx.recyclerview.widget.recyclerview；
导入android.app.Dialog；
导入android.graphics.Color；
导入android.graphics.drawable.ColorDrawable；
导入android.os.Bundle；
导入android.view.view；
导入android.widget.Button；
导入android.widget.TextView；
导入android.widget.Toast；
导入com.google.firebase.auth.FirebaseAuth；
导入java.text.NumberFormat；
导入java.util.ArrayList；
导入java.util.Locale；
导入静态android.widget.Toast.*；
公共类OrderActivity扩展AppCompatActivity实现OrderAdapter.TotalListener{
回收视图回收视图；
ArrayList orderArrayList；
text查看text查看订单\价格；
text查看text查看订单数量；
对话与对话；
按钮btnCheckout；
按钮btnAbort；
@凌驾
创建时受保护的void（Bundle savedInstanceState）{
super.onCreate（savedInstanceState）；
setContentView（R.layout.activity_order）；
recyclerView=findViewById（R.id.recyclerView\u order\u scroll）；
textView\u order\u price=findviewbyd（R.id.textView\u order\u price）；
textView\u order\u count=findviewbyd（R.id.textView\u order\u count）；
btnCheckout=（按钮）findViewById（R.id.btnCheckout）；
orderArrayList=新建ArrayList（）；
orderArrayList.add（新型号订单（R.drawable.coke，“Coka Cola”，“Eine Cola hält dich wach and schmeckt dazu.”，“3”，0））；
orderArrayList.add（新模式订单（R.drawable.fastfood，“Pommes”，“Friten füR die Titten.”，“5”，0））；
添加（新模型订单（R.drawable.water，“Wasser”，“Still und sanft，so mag ich es.”，“5”，0））；
orderArrayList.add（新模型Order（R.dravable.burger，“burger”，“Ach mir fällt nichts ein.”，“10”，0））；
LinearLayoutManager layoutManager=新的LinearLayoutManager（此）；
RecyclerView.LayoutManager recilayoutmanager=LayoutManager；
recyclerView.setLayoutManager（RecilayoutManager）；
OrderAdapter=新的OrderAdapter（this，orderArrayList，this）；
recyclerView.setAdapter（适配器）；
epicDialog=新建对话框（此）；
btnCheckout.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
showWaitingPopUp（）；
}
});
}
私有void showWaitingPopUp（）{
epicDialog.setContentView（R.layout.order\u popup\u waiting）；
epicDialog.getWindow（）.setBackgroundDrawable（新的ColorDrawable（Color.TRANSPARENT））；
btnAbort=（按钮）epicDialog.findViewById（R.id.btnAbort）；
btnAbort.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
epicDialog.disclose（）；
}
});
epicDialog.show（）；
}
@凌驾
已更改公共void（字符串结果）{
NumberFormat n=NumberFormat.getCurrencyInstance（Locale.GERMANY）；
textView_order_price.setText（n.format（Integer.parseInt（result））；
}
@凌驾
公共void onCountChanged（字符串结果）{
textView\u order\u count.setText（结果）；
}
}

OrderAdapter.java

package com.nfc.netvision;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.app.Dialog;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.firebase.auth.FirebaseAuth;

import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Locale;

import static android.widget.Toast.*;

public class OrderActivity extends AppCompatActivity implements OrderAdapter.TotalListener {

    RecyclerView recyclerView;
    ArrayList<ModelOrder> orderArrayList;
    TextView textView_order_price;
    TextView textView_order_count;
    Dialog epicDialog;
    Button btnCheckout;
    Button btnAbort;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_order);

        recyclerView = findViewById(R.id.recyclerview_order_scroll);
        textView_order_price = findViewById(R.id.textView_order_price);
        textView_order_count = findViewById(R.id.textView_order_count);
        btnCheckout = (Button) findViewById(R.id.btnCheckout);


        orderArrayList = new ArrayList<>();
        orderArrayList.add(new ModelOrder(R.drawable.coke, "Coka Cola", "Eine Cola hält dich wach und schmeckt dazu.", "3",0));
        orderArrayList.add(new ModelOrder(R.drawable.fastfood, "Pommes", "Fritten für die Titten.", "5",0));
        orderArrayList.add(new ModelOrder(R.drawable.water, "Wasser", "Still und sanft, so mag ich es.", "5",0));
        orderArrayList.add(new ModelOrder(R.drawable.burger, "Burger", "Ach mir fällt nichts ein.", "10",0));

        LinearLayoutManager layoutManager = new LinearLayoutManager(this);
        RecyclerView.LayoutManager recLiLayoutManager = layoutManager;

        recyclerView.setLayoutManager(recLiLayoutManager);

        OrderAdapter adapter = new OrderAdapter(this, orderArrayList, this);

        recyclerView.setAdapter(adapter);

        epicDialog = new Dialog(this);

        btnCheckout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                showWaitingPopUp();


            }
        });



    }

    private void showWaitingPopUp() {
        epicDialog.setContentView(R.layout.order_popup_waiting);
        epicDialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        btnAbort = (Button) epicDialog.findViewById(R.id.btnAbort);
        btnAbort.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
               epicDialog.dismiss();
            }
        });
        epicDialog.show();
    }


    @Override
    public void onTotalChanged(String result) {
        NumberFormat n = NumberFormat.getCurrencyInstance(Locale.GERMANY);
        textView_order_price.setText( n.format(Integer.parseInt(result)));
    }

    @Override
    public void onCountChanged(String result) {
        textView_order_count.setText(result);

    }
}

package com.nfc.netvision;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;


import org.w3c.dom.Text;

import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.Locale;


public class OrderAdapter extends RecyclerView.Adapter<OrderAdapter.ViewHolder> {

    private int totalAmount;
    private int totalItems;
    private Context mContext;
    private ArrayList<ModelOrder> nList;

    private TotalListener listener;

    interface TotalListener{
        void onTotalChanged(String result);
        void onCountChanged(String result);

    }
    OrderAdapter(Context context, ArrayList<ModelOrder> list, TotalListener listener) {
        mContext = context;
        nList = list;
        this.listener = listener;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {

        LayoutInflater layoutInflater = LayoutInflater.from(mContext);
        View view = layoutInflater.inflate(R.layout.recyclerview_order_items, parent, false);

        ViewHolder viewHolder = new ViewHolder(view);

        return viewHolder;
    }

    @Override
    public void onBindViewHolder(@NonNull final ViewHolder holder, int position) {

        final ModelOrder orderItem = nList.get(position);
        ImageView image = holder.item_image;
        final TextView name, place, price;
        name = holder.item_name;
        place = holder.item_place;
        price = holder.item_price;

        image.setImageResource(orderItem.getImage());

        name.setText(orderItem.getName());
        place.setText(orderItem.getPlace());
        price.setText(orderItem.getPrice());


        holder.order_item_minus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(orderItem.getCounter() > 0) {
                    orderItem.setCounter(orderItem.getCounter()-1);
                    holder.order_item_count.setText("" + orderItem.getCounter());
                    calculatePrice(Integer.parseInt((String) price.getText()), false);
                    countItems(orderItem.getCounter(), false);

                }

            }
        });

        holder.order_item_plus.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(orderItem.getCounter() < 9) {
                    orderItem.setCounter(orderItem.getCounter() + 1);
                    holder.order_item_count.setText("" + orderItem.getCounter());
                    calculatePrice(Integer.parseInt((String) price.getText()), true);
                    countItems(orderItem.getCounter(), true);
                }
            }
        });




    }

    @Override
    public int getItemCount() {
        return nList.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        ImageView item_image;
        TextView item_name, item_place, item_price,order_item_minus,order_item_count, order_item_plus;

        public ViewHolder(@NonNull View itemView) {

            super(itemView);
            item_image = itemView.findViewById(R.id.order_item_image);
            item_name = itemView.findViewById(R.id.order_item_name);
            item_place = itemView.findViewById(R.id.order_item_place);
            item_price = itemView.findViewById(R.id.order_item_price);
            order_item_minus = itemView.findViewById(R.id.order_item_minus);
            order_item_plus = itemView.findViewById(R.id.order_item_plus);
            order_item_count = itemView.findViewById(R.id.order_item_count);
        }
    }

    private void calculatePrice(int pPrice, boolean pUpDown) {
        if(pUpDown) {
            totalAmount = totalAmount + pPrice;
        }
        else {
            totalAmount = totalAmount - pPrice;
        }

        listener.onTotalChanged(totalAmount+ "");
    }

    private void countItems(int pCounter, boolean pUpDown){
        if (pUpDown){
            totalItems = totalItems + 1;
        }
        else{
            totalItems = totalItems - 1;
        }
        listener.onCountChanged(totalItems+ "");

    }


}

package com.nfc.netvision；
导入android.content.Context；
导入android.view.LayoutInflater；
导入android.view.view；
导入android.view.ViewGroup；
导入android.widget.ImageView；
导入android.widget.TextView；
导入androidx.annotation.NonNull；
导入androidx.recyclerview.widget.recyclerview；
导入org.w3c.dom.Text；
导入java.text.NumberFormat；
导入java.util.ArrayList；
导入java.util.Locale；
公共类OrderAdapter扩展了RecyclerView.Adapter{
私人总金额；
私人物品；
私有上下文；
私有数组列表；
私人监听者；
接口侦听器{
void onTotalChanged（字符串结果）；
void onCountChanged（字符串结果）；
}
OrderAdapter（上下文上下文、ArrayList列表、TotalListener侦听器）{
mContext=上下文；
nList=列表；
this.listener=listener；
}
@非空
@凌驾
public ViewHolder onCreateViewHolder（@NonNull ViewGroup parent，int viewType）{
LayoutInflater LayoutInflater=LayoutInflater.from（mContext）；
视图=LayoutFlater.充气（R.layout.recyclerview\u order\u items，父项，false）；
ViewHolder ViewHolder=新的ViewHolder（视图）；
返回视图持有者；
}
@凌驾
public void onBindViewHolder（@NonNull final ViewHolder，int位置）{
final ModelOrder orderItem=nList.get（位置）；
ImageView image=holder.item\u image；
最终文本视图名称、地点、价格；
名称=持有人。项目名称；
地点=持有人。项目\地点；
价格=持有人。项目价格；
setImageResource（orderItem.getImage（））；
name.setText（orderItem.getName（））；
setText（orderItem.getPlace（））；
price.setText（orderItem.getPrice（））；
holder.order\u item\u减.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图）{
if（orderItem.getCounter（）>0）{
orderItem.setCounter（orderItem.getCounter（）-1）；
holder.order\u item\u count.setText（“+orderItem.getCounter（））；
calculatePrice（Integer.parseInt（（String）price.getText（）），false）；
OrderAdapter adapter = new OrderAdapter(this, orderArrayList, this);

OrderAdapter adapter = new OrderAdapter(this, orderArrayList);

OrderAdapter(Context context, ArrayList<ModelOrder> list) {
    mContext = context;
    nList = list;

    // You can simply cast the context to the listener
    listener = (TotalListener) context;
}