1.使用ListView和Adapter实现购物商城

Android 布局文件

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="match_parent"
tools:context=".MainActivity">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="@+id/lv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

  

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="horizontal" android:layout_width="match_parent"
android:layout_height="match_parent"> <ImageView
android:id="@+id/iv"
android:layout_width="170dp"
android:layout_height="150dp"
> </ImageView> <TextView
android:id="@+id/tv1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="50dp"
android:text="111"> </TextView> <TextView
android:id="@+id/tv2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="100dp"
android:layout_marginLeft="-75dp"
android:text="222"> </TextView> </LinearLayout>

  java类(三个)

package com.example.myhomework3;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.widget.ListView; import java.util.ArrayList;
import java.util.List; public class MainActivity extends AppCompatActivity { private List<shopping> shoppingList = new ArrayList<shopping>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initShopping();
shoppingAdapter shoppingAdapter = new shoppingAdapter(MainActivity.this,R.layout.item,shoppingList);
ListView listView = findViewById(R.id.lv1);
listView.setAdapter(shoppingAdapter);
} private void initShopping(){
shopping book = new shopping("限定","价格:500元",R.drawable.book);
shoppingList.add(book); shopping book1 = new shopping("书1","价格:26元",R.drawable.book1);
shoppingList.add(book1); shopping book2 = new shopping("书2","价格:29元",R.drawable.book2);
shoppingList.add(book2); shopping book3 = new shopping("书3","价格:36元",R.drawable.book3);
shoppingList.add(book3); shopping book4 = new shopping("书4","价格:18元",R.drawable.book4);
shoppingList.add(book4); shopping book5 = new shopping("书5","价格:33元",R.drawable.book5);
shoppingList.add(book5); shopping book6 = new shopping("书6","价格:52元",R.drawable.book6);
shoppingList.add(book6);
}
}
package com.example.myhomework3;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView; import java.util.List; public class shoppingAdapter extends ArrayAdapter {
private final int resourceId; public shoppingAdapter(Context context, int textViewResourceId, List<shopping> objects){
super(context,textViewResourceId,objects);
resourceId = textViewResourceId;
} @Override
public View getView(int position, View convertView, ViewGroup viewGroup){
shopping shopping = (com.example.myhomework3.shopping)getItem(position);
View view = LayoutInflater.from(getContext()).inflate(resourceId,null);
ImageView imageView = view.findViewById(R.id.iv);
TextView textView1 = view.findViewById(R.id.tv1);
TextView textView2 = view.findViewById(R.id.tv2);
imageView.setImageResource(shopping.getImageId());
textView1.setText(shopping.getName());
textView2.setText(shopping.getPrice());
return view;
}
package com.example.myhomework3;

public class shopping {
private String name;
private String price;
private int imageId; public shopping(String name, String price, int imageId) {
this.name = name;
this.price = price;
this.imageId = imageId;
} public String getName() {
return name;
} public void setName(String name) {
this.name = name;
} public String getPrice() {
return price;
} public void setPrice(String price) {
this.price = price;
} public int getImageId() {
return imageId;
} public void setImageId(int imageId) {
this.imageId = imageId;
}
}

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