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; } } }
