Android作业0930

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;
    }
}