Android-9

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:app="http://schemas.android.com/apk/res-auto"
 4     xmlns:tools="http://schemas.android.com/tools"
 5     android:layout_width="match_parent"
 6     android:layout_height="match_parent"
 7     android:background="#FF5722"
 8     android:orientation="vertical"
 9     tools:context=".MainActivity">
10 
11     <TextView
12         android:id="@+id/textView"
13         android:layout_width="match_parent"
14         android:layout_height="40dp"
15         android:background="#FF5722"
16         android:gravity="center"
17         android:text="购物车"
18         android:textSize="24sp"
19         android:textStyle="bold" />
20 
21     <LinearLayout
22         android:layout_width="match_parent"
23         android:layout_height="match_parent"
24         android:layout_weight="1"
25         android:orientation="vertical">
26 
27         <ListView
28             android:id="@+id/buylist"
29             android:layout_width="match_parent"
30             android:layout_height="match_parent"
31             android:background="#F1F0EF" />
32 
33     </LinearLayout>
34 
35     <Button
36         android:id="@+id/but_sum"
37         android:layout_width="match_parent"
38         android:layout_height="wrap_content"
39         android:background="#FF5722"
40         android:text="结算"
41         android:textSize="18sp"
42         app:backgroundTint="#FF5722" />
43 
44 </LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="120dp"
    android:layout_marginTop="10px"
    android:layout_marginBottom="20px"
    android:background="#F6F2F0"
    android:gravity="center">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="100dp"
        android:layout_height="100dp"
        tools:srcCompat="@tools:sample/backgrounds/scenic" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <TextView
            android:id="@+id/t_topic"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="120px"
            android:text="苹果"
            android:textColor="@color/black" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/t_price"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="120px"
                android:gravity="right"
                android:text="六"
                android:textColor="@color/black" />

            <TextView
                android:id="@+id/textView3"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="元1斤"
                android:textColor="@color/black" />
        </LinearLayout>

        <TableLayout
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:gravity="center">

            <TableRow
                android:layout_width="wrap_content"
                android:layout_height="30dp"
                android:gravity="center">

                <TextView
                    android:id="@+id/textView4"
                    android:layout_width="150dp"
                    android:layout_height="wrap_content"
                    android:gravity="center"
                    android:text="购买数量"
                    android:textColor="@color/black" />

                <Button
                    android:id="@+id/add"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:background="@mipmap/add"
                    android:gravity="center"
                    android:textColor="@color/black"
                    android:textSize="14sp"
                    app:backgroundTint="#FF5722" />

                <TextView
                    android:id="@+id/t_view"
                    android:layout_width="50dp"
                    android:layout_height="50dp"
                    android:gravity="center"
                    android:text="0"
                    android:textColor="@color/black" />

                <Button
                    android:id="@+id/reduce"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:autoText="false"
                    android:background="@mipmap/reduce"
                    android:freezesText="false"
                    android:gravity="center"
                    android:textColor="@color/black"
                    android:textSize="14sp"
                    app:backgroundTint="#FF5722" />
            </TableRow>

        </TableLayout>
    </LinearLayout>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF"
    android:orientation="vertical">

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:background="#FF5722"
        android:gravity="center"
        android:text="结算"
        android:textColor="@color/black"
        android:textSize="24sp" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical">

        <ListView
            android:id="@+id/sumlist"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#F1F0EF" />

    </LinearLayout>

    <Button
        android:id="@+id/button2"
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:text="总计" />

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="修改" />

</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#FFFFFF">

    <TextView
        android:id="@+id/s_name"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:layout_weight="1"
        android:textColor="@color/black" />

    <TextView
        android:id="@+id/s_price"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:layout_weight="1"
        android:textColor="@color/black" />
</LinearLayout>

package com.example.student;

/*实体类*/
public class Buy {

    private int imageId;
    private String Name,price,sum;


    public Buy(int imageId, String name, String price) {
        this.imageId = imageId;
        Name = name;
        this.price = price;
    }

    public Buy(String name, String sum) {
        Name = name;
        this.sum = sum;
    }

    public int getImageId() {
        return imageId;
    }

    public void setImageId(int imageId) {
        this.imageId = imageId;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public String getPrice() {
        return price;
    }

    public void setPrice(String price) {
        this.price = price+"元1斤";
    }

    public String getSum() {
        return sum;
    }

    public void setSum(String sum) {
        this.sum = sum;
    }

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

}

package com.example.student;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import androidx.annotation.Nullable;
/*SQL类*/
public class BuySql extends SQLiteOpenHelper {
    public BuySql(@Nullable Context context) {
        super(context, "buy.db", null, 2);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("CREATE TABLE buy(_id INTEGER PRIMARY KEY AUTOINCREMENT,b_name VARCHAR(20),b_price VARCHAR(30),b_sum VARCHAR(30))");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }
}

package com.example.student;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity  {


    final List<Buy> buysList = new ArrayList<Buy>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initFruits();
        BuyAdapte adapter = new BuyAdapte(this,R.layout.item,buysList);
        ListView lv = (ListView)findViewById(R.id.buylist);
        lv.setAdapter(adapter);
        Button but_sum = (Button)findViewById(R.id.but_sum);

        but_sum.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(MainActivity.this,SumActivity.class);

                startActivityForResult(intent,1);
            }
        });
    }




    /*数据输入方法，调用实体类*/
    public void initFruits(){
        Buy apple = new Buy(R.mipmap.apple,"苹果","5");//sum是购物车中添加的物品多少
        buysList.add(apple);
        Buy banana = new Buy(R.mipmap.banana,"香蕉","6.5");
        buysList.add(banana);
        Buy grape = new Buy(R.mipmap.grape,"葡萄","10");
        buysList.add(grape);
        Buy kiwi = new Buy(R.mipmap.kiwi,"猕猴桃","12");
        buysList.add(kiwi);
        Buy mango = new Buy(R.mipmap.mango,"芒果","6");
        buysList.add(mango);
        Buy orange = new Buy(R.mipmap.orange,"橘子","4.8");
        buysList.add(orange);

    }



    /*数据适配器Adapte*/

    public class BuyAdapte extends ArrayAdapter {
        int resourceId;
        public BuyAdapte(@NonNull Context context, int resource, List<Buy> objects) {
            super(context, resource,objects);
            resourceId = resource;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            //获取当前Buy实例
            Buy buy = (Buy) getItem(position);
            View view = LayoutInflater.from(getContext()).inflate(resourceId, null);
            ImageView iv = (ImageView) view.findViewById(R.id.imageView);
            TextView tv = (TextView) view.findViewById(R.id.t_topic);
            TextView pv = (TextView) view.findViewById(R.id.t_price);
            TextView ta = (TextView) view.findViewById(R.id.t_view);
            Button add = (Button)view.findViewById(R.id.add);
            Button reduce = (Button)view.findViewById(R.id.reduce);
            iv.setImageResource(buy.getImageId());
            tv.setText((CharSequence) buy.getName());
            pv.setText((CharSequence)buy.getPrice());
            add.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int n1 = Integer.parseInt(ta.getText().toString());
                    if(n1>=0){
                        n1 = n1 + 1;
                        String a = String.valueOf(n1);
                        ta.setText(a);
                        buy.setSum(a);
                    }
                }
            });
            reduce.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    int n1=Integer.parseInt(ta.getText().toString());
                    if (n1>0){
                        n1=n1-1;
                        String a = String.valueOf(n1);
                        ta.setText(a);
                        buy.setSum(a);
                    }
                }
            });



            return view;
        }



    }





}

package com.example.student;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class SumActivity extends AppCompatActivity {

    final List<Buy> sumsList = new ArrayList<Buy>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_sum2);
        buyFruits();
        SumActivity.SumAdapte adapter = new SumActivity.SumAdapte(this,R.layout.sum_item,sumsList);
        ListView lv = (ListView)findViewById(R.id.sumlist);
        lv.setAdapter(adapter);

        Button but = (Button)findViewById(R.id.button);

        but.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(SumActivity.this,MainActivity.class);

                setResult(2,intent);
                finish();
            }
        });

    }


    public void buyFruits(){

        Buy apple = new Buy("苹果","15");//sum是购物车中添加的物品多少
        sumsList.add(apple);
        Buy banana = new Buy("香蕉","6.5");
        sumsList.add(banana);
        Buy grape = new Buy("葡萄","10");
        sumsList.add(grape);
        Buy kiwi = new Buy("猕猴桃","12");
        sumsList.add(kiwi);
        Buy mango = new Buy("芒果","6");
        sumsList.add(mango);
        Buy orange = new Buy("橘子","4.8");
        sumsList.add(orange);

    }




    public class SumAdapte extends ArrayAdapter {
        int resourceId;
        public SumAdapte(@NonNull Context context, int resource, List<Buy> objects) {
            super(context, resource,objects);
            resourceId = resource;
        }
        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            //获取当前Buy实例
            Buy buy = (Buy) getItem(position);
            View view = LayoutInflater.from(getContext()).inflate(resourceId, null);
            TextView tv = (TextView) view.findViewById(R.id.s_name);
            TextView pv = (TextView) view.findViewById(R.id.s_price);
            tv.setText( buy.getName());
            pv.setText(buy.getSum());

            return view;
        }



    }






}

posted on 2020-11-10 08:20 yunkuang 阅读(141) 评论(0) 编辑收藏举报