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  • Android_9购物车

      1 <?xml version="1.0" encoding="utf-8"?>
      2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      3     xmlns:tools="http://schemas.android.com/tools"
      4     android:layout_width="match_parent"
      5     android:layout_height="wrap_content"
      6     android:orientation="vertical"
      7     tools:context=".MainActivity">
      8 
      9     <TextView
     10         android:id="@+id/textView"
     11         android:layout_width="match_parent"
     12         android:layout_height="wrap_content"
     13         android:background="#FF5722"
     14         android:gravity="center_horizontal"
     15         android:text="购物车"
     16         android:textSize="24sp" />
     17 
     18     <TableLayout
     19         android:layout_width="match_parent"
     20         android:layout_height="match_parent">
     21 
     22         <TableRow
     23             android:layout_width="match_parent"
     24             android:layout_height="match_parent"
     25             android:gravity="center_horizontal">
     26 
     27             <TextView
     28                 android:id="@+id/textView2"
     29                 android:layout_width="wrap_content"
     30                 android:layout_height="wrap_content"
     31                 android:text="物品名:" />
     32 
     33             <EditText
     34                 android:id="@+id/et_1"
     35                 android:layout_width="wrap_content"
     36                 android:layout_height="wrap_content"
     37                 android:ems="10"
     38                 android:inputType="textPersonName" />
     39         </TableRow>
     40 
     41         <TableRow
     42             android:layout_width="match_parent"
     43             android:layout_height="match_parent"
     44             android:gravity="center_horizontal">
     45 
     46             <TextView
     47                 android:id="@+id/textView4"
     48                 android:layout_width="wrap_content"
     49                 android:layout_height="wrap_content"
     50                 android:text="价格:" />
     51 
     52             <EditText
     53                 android:id="@+id/et_2"
     54                 android:layout_width="match_parent"
     55                 android:layout_height="wrap_content"
     56                 android:ems="10"
     57                 android:inputType="textPersonName" />
     58         </TableRow>
     59 
     60         <TableRow
     61             android:layout_width="match_parent"
     62             android:layout_height="match_parent"
     63             android:gravity="center_horizontal">
     64 
     65             <TextView
     66                 android:id="@+id/textView5"
     67                 android:layout_width="wrap_content"
     68                 android:layout_height="wrap_content"
     69                 android:text="数量:" />
     70 
     71             <EditText
     72                 android:id="@+id/et_3"
     73                 android:layout_width="wrap_content"
     74                 android:layout_height="wrap_content"
     75                 android:ems="10"
     76                 android:inputType="textPersonName" />
     77 
     78         </TableRow>
     79 
     80     </TableLayout>
     81 
     82     <LinearLayout
     83         android:layout_width="match_parent"
     84         android:layout_height="match_parent"
     85         android:orientation="horizontal">
     86 
     87         <Button
     88             android:id="@+id/add"
     89             android:layout_width="match_parent"
     90             android:layout_height="match_parent"
     91             android:layout_weight="1"
     92             android:onClick="add_Click"
     93             android:text="加入购物车" />
     94 
     95         <Button
     96             android:id="@+id/delete"
     97             android:layout_width="match_parent"
     98             android:layout_height="match_parent"
     99             android:layout_weight="1"
    100             android:onClick="delete_Click"
    101             android:text="从购物车中删除" />
    102 
    103         <Button
    104             android:id="@+id/query"
    105             android:layout_width="match_parent"
    106             android:layout_height="match_parent"
    107             android:layout_weight="1"
    108             android:onClick="find_Click"
    109             android:text="查看购物车" />
    110 
    111         <Button
    112             android:id="@+id/update"
    113             android:layout_width="match_parent"
    114             android:layout_height="match_parent"
    115             android:layout_weight="1"
    116             android:onClick="update_Click"
    117             android:text="修改购物车中物品" />
    118 
    119     </LinearLayout>
    120 
    121     <LinearLayout
    122         android:layout_width="match_parent"
    123         android:layout_height="match_parent"
    124         android:orientation="horizontal">
    125 
    126         <TextView
    127             android:id="@+id/textView3"
    128             android:layout_width="40dp"
    129             android:layout_height="wrap_content"
    130             android:layout_weight="1"
    131             android:gravity="center_horizontal"
    132             android:text="物品" />
    133 
    134         <TextView
    135             android:id="@+id/textView6"
    136             android:layout_width="40dp"
    137             android:layout_height="wrap_content"
    138             android:layout_weight="1"
    139             android:gravity="center_horizontal"
    140             android:text="价格" />
    141 
    142         <TextView
    143             android:id="@+id/textView7"
    144             android:layout_width="40dp"
    145             android:layout_height="wrap_content"
    146             android:layout_weight="1"
    147             android:gravity="center_horizontal"
    148             android:text="数量" />
    149     </LinearLayout>
    150 
    151     <LinearLayout
    152         android:layout_width="match_parent"
    153         android:layout_height="match_parent"
    154         android:orientation="vertical">
    155 
    156         <ListView
    157             android:id="@+id/list"
    158             android:layout_width="match_parent"
    159             android:layout_height="match_parent"
    160             android:layout_weight="1" />
    161     </LinearLayout>
    162 
    163 </LinearLayout>
     1 <?xml version="1.0" encoding="utf-8"?>
     2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
     3     android:layout_width="match_parent"
     4     android:layout_height="match_parent">
     5 
     6     <TextView
     7         android:id="@+id/t_name"
     8         android:layout_width="40dp"
     9         android:layout_height="30dp"
    10         android:layout_weight="1"
    11         android:background="@drawable/txt_shap"
    12         android:gravity="left"
    13         android:textSize="18sp"
    14         android:textStyle="bold" />
    15 
    16     <TextView
    17         android:id="@+id/t_price"
    18         android:layout_width="40dp"
    19         android:layout_height="30dp"
    20         android:layout_weight="1"
    21         android:background="@drawable/txt_shap"
    22         android:gravity="right"
    23         android:textSize="18sp" />
    24 
    25     <TextView
    26         android:id="@+id/t_number"
    27         android:layout_width="40dp"
    28         android:layout_height="30dp"
    29         android:layout_weight="1"
    30         android:background="@drawable/txt_shap"
    31         android:gravity="left"
    32         android:textSize="18sp" />
    33 
    34 </LinearLayout>
     1  package com.example.myapplication;
     2 
     3 public class Sqldata {
     4 
     5     private int id;
     6     private String name,price,number;
     7 
     8     public Sqldata() {
     9     }
    10 
    11     public Sqldata(int id, String name, String price, String number) {
    12         this.id = id;
    13         this.name = name;
    14         this.price = price;
    15         this.number = number;
    16     }
    17 
    18     public Sqldata(String name, String price, String number) {
    19         this.name = name;
    20         this.price = price;
    21         this.number = number;
    22     }
    23 
    24     public int getId() {
    25         return id;
    26     }
    27 
    28     public void setId(int id) {
    29         this.id = id;
    30     }
    31 
    32     public String getName() {
    33         return name;
    34     }
    35 
    36     public void setName(String name) {
    37         this.name = name;
    38     }
    39 
    40     public String getPrice() {
    41         return price;
    42     }
    43 
    44     public void setPrice(String price) {
    45         this.price = price;
    46     }
    47 
    48     public String getNumber() {
    49         return number;
    50     }
    51 
    52     public void setNumber(String number) {
    53         this.number = number;
    54     }
    55 }
     1 package com.example.myapplication;
     2 
     3 import android.content.Context;
     4 import android.database.sqlite.SQLiteDatabase;
     5 import android.database.sqlite.SQLiteOpenHelper;
     6 
     7 import androidx.annotation.Nullable;
     8 
     9 public class MyHelper extends SQLiteOpenHelper {
    10     public MyHelper(@Nullable Context context) {
    11         super(context, "car.db", null, 1);
    12     }
    13 
    14     @Override
    15     public void onCreate(SQLiteDatabase db) {
    16         db.execSQL("create table car(_id integer primary key autoincrement,name varchar(50),price varchar(50),number varchar(50))");
    17     }
    18 
    19     @Override
    20     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    21 
    22     }
    23 }
      1 package com.example.myapplication;
      2 
      3 import androidx.annotation.NonNull;
      4 import androidx.appcompat.app.AppCompatActivity;
      5 
      6 import android.content.ContentValues;
      7 import android.content.Context;
      8 import android.content.Intent;
      9 import android.database.Cursor;
     10 import android.database.sqlite.SQLiteDatabase;
     11 import android.os.Bundle;
     12 import android.view.LayoutInflater;
     13 import android.view.View;
     14 import android.view.ViewGroup;
     15 import android.widget.ArrayAdapter;
     16 import android.widget.BaseAdapter;
     17 import android.widget.Button;
     18 import android.widget.EditText;
     19 import android.widget.ListView;
     20 import android.widget.TextView;
     21 import android.widget.Toast;
     22 
     23 import java.util.ArrayList;
     24 import java.util.List;
     25 
     26 public class MainActivity extends AppCompatActivity implements View.OnClickListener {
     27 
     28     Intent intent = new Intent();
     29     EditText name,price,number;
     30     Button add;
     31     ListView lv;
     32     private MyHelper helper;
     33     List<Sqldata> list = new ArrayList<>();
     34     @Override
     35     protected void onCreate(Bundle savedInstanceState) {
     36         super.onCreate(savedInstanceState);
     37         setContentView(R.layout.activity_main);
     38 
     39         name = (EditText)findViewById(R.id.et_1);
     40         price = (EditText)findViewById(R.id.et_2);
     41         number = (EditText)findViewById(R.id.et_3);
     42 
     43         add = (Button)findViewById(R.id.add);
     44 
     45         lv = (ListView)findViewById(R.id.list);
     46 
     47         helper = new MyHelper(this);
     48 
     49 
     50 
     51 
     52     }
     53 
     54 
     55     public void add_Click(View view){
     56         Sqldata date = new Sqldata(name.getText().toString(),price.getText().toString(),number.getText().toString());
     57         insert(date);
     58         Toast.makeText(MainActivity.this,name.getText().toString()+"已添加到购物车",Toast.LENGTH_SHORT).show();
     59     }
     60 
     61     public void delete_Click(View view){
     62         int num = delete(name.getText().toString());
     63         if (num > 0){
     64             Toast.makeText(MainActivity.this,"删除成功",Toast.LENGTH_SHORT).show();
     65         }else{
     66             Toast.makeText(MainActivity.this,"删除失败",Toast.LENGTH_SHORT).show();
     67         }
     68     }
     69 
     70 
     71 
     72 
     73     public void update_Click(View view){
     74         update(name.getText().toString(),price.getText().toString(),number.getText().toString());
     75     }
     76 
     77 
     78 
     79     public void find_Click(View view){
     80         find(name.getText().toString());
     81 
     82     }
     83 
     84 
     85 
     86     @Override
     87     public void onClick(View v) {
     88 
     89     }
     90 
     91 
     92 
     93 
     94     //添加到购物车
     95 
     96     public long insert(Sqldata sqldata){
     97         long id = 0;
     98         SQLiteDatabase db =null;
     99 
    100         try {
    101             db = helper.getWritableDatabase();
    102 
    103             ContentValues values = new ContentValues();
    104 
    105             values.put("name",sqldata.getName());
    106             values.put("price",sqldata.getPrice());
    107             values.put("number",sqldata.getNumber());
    108 
    109             db.insert("car",null,values);
    110         } catch (Exception e) {
    111             e.printStackTrace();
    112         } finally {
    113             if (db != null){
    114                 db.close();
    115             }
    116         }
    117 
    118 
    119         return id;
    120     }
    121 
    122     //从购物车中删除
    123 
    124     public int delete(String name){
    125 
    126         SQLiteDatabase db = null;
    127         int num = 0;
    128         try {
    129             db = helper.getWritableDatabase();
    130             num = db.delete("car","name = ?",new String[]{name});
    131         } catch (Exception e) {
    132             e.printStackTrace();
    133         } finally {
    134             if (db!=null){
    135                 db.close();
    136             }
    137         }
    138         return num;
    139     }
    140 
    141     //查看购物车
    142 
    143     public List<Sqldata> find(String name){
    144         SQLiteDatabase db = null;
    145         db = helper.getReadableDatabase();
    146         MyBaseAdapter myBaseAdapter = new MyBaseAdapter(this,R.layout.item,list);
    147         try {
    148 
    149                 Cursor cursor = db.query("car",null,null,null,null,null,null);
    150                 if (cursor.getCount()!=0){
    151                     while (cursor.moveToNext()){
    152                         Sqldata find = new Sqldata();
    153                         find.setName(cursor.getString(cursor.getColumnIndex("name")));
    154                         find.setPrice(cursor.getString(cursor.getColumnIndex("price")));
    155                         find.setNumber(cursor.getString(cursor.getColumnIndex("number")));
    156                         list.add(find);
    157                         lv.setAdapter(myBaseAdapter);
    158                     }
    159                 }
    160                 cursor.close();
    161 
    162         } catch (Exception e) {
    163             e.printStackTrace();
    164         } finally {
    165             if (db != null){
    166                 db.close();
    167             }
    168         }
    169 
    170         return list;
    171 
    172     }
    173 
    174 
    175     //对购物车进行修改
    176 
    177     public int update(String name,String price,String number){
    178         SQLiteDatabase db = null;
    179         int num = 0;
    180         try {
    181             db = helper.getWritableDatabase();
    182             ContentValues values = new ContentValues();
    183             values.put("price",price);
    184             values.put("number",number);
    185             num = db.update("car",values,"name = ?",new String[]{name});
    186         } catch (Exception e) {
    187             e.printStackTrace();
    188         } finally {
    189             if (db!=null){
    190                 db.close();
    191             }
    192         }
    193 
    194         return num;
    195     }
    196 
    197 
    198 
    199 
    200 
    201 
    202 
    203     class MyBaseAdapter extends BaseAdapter {
    204 
    205         public MyBaseAdapter(MainActivity mainActivity, int list_item, List<Sqldata> show) {
    206         }
    207 
    208         @Override
    209         public int getCount() {
    210             return list.size();
    211         }
    212 
    213         @Override
    214         public Object getItem(int position) {
    215             return null;
    216         }
    217 
    218         @Override
    219         public long getItemId(int position) {
    220             return position;
    221         }
    222 
    223         @Override
    224         public View getView(int position, View convertView, ViewGroup parent) {
    225             View view = View.inflate(MainActivity.this,R.layout.item,null);
    226             TextView tname = (TextView)view.findViewById(R.id.t_name);
    227             TextView tprice = (TextView)view.findViewById(R.id.t_price);
    228             TextView tnumber = (TextView)view.findViewById(R.id.t_number);
    229 
    230 
    231             tname.setText(list.get(position).getName());
    232             tprice.setText(list.get(position).getPrice());
    233             tnumber.setText(list.get(position).getNumber());
    234             return view;
    235         }
    236     }
    237 
    238 
    239 }
     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     tools:context=".SecondActivity">
     8 
     9     <TextView
    10         android:id="@+id/tn"
    11         android:layout_width="150dp"
    12         android:layout_height="wrap_content" />
    13 
    14     <TextView
    15         android:id="@+id/tp"
    16         android:layout_width="100dp"
    17         android:layout_height="wrap_content" />
    18 
    19     <TextView
    20         android:id="@+id/tnu"
    21         android:layout_width="wrap_content"
    22         android:layout_height="wrap_content" />
    23 </LinearLayout>

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  • 原文地址:https://www.cnblogs.com/yunlan/p/14141520.html
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