[移动开发]Android 滚动菜单ListView实例

说明：滚动菜单ListView及点击事件

代码结构：

1、创建一个list展示模型

app\src\main\res\layout\fruit_item.xml

<?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/fruit_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"/>
    <TextView
        android:id="@+id/fruit_name"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="center_vertical"
        android:layout_marginLeft="10dp"/>

</LinearLayout>

2、主界面引用一下

app\src\main\res\layout\activity_main.xml

<?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="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</LinearLayout>

3、创建fruit类

app\src\main\java\com\example\listviewtest\Fruit.java

package com.example.listviewtest;

public class Fruit {
    private String name;
    private int imageId;
    public Fruit(String name,int imageId){
        this.name = name;
        this.imageId = imageId;
    }
    public String getName(){
        return name;
    }
    public int getImageId(){
        return imageId;
    }
}

4、创建适配器

app\src\main\java\com\example\listviewtest\FruitAdapter.java

package com.example.listviewtest;

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 FruitAdapter extends ArrayAdapter<Fruit> {
    private int resourceId;
    public FruitAdapter(Context context,
                        int textViewResourceId,
                        List<Fruit> object){
        super(context,textViewResourceId,object);
        resourceId = textViewResourceId;
    }
    public View getView(int position, View converView, ViewGroup parent){
        Fruit fruit = getItem(position);
        View view = LayoutInflater.from(getContext()).inflate(resourceId,parent,false);
        ImageView fruitImage = (ImageView) view.findViewById(R.id.fruit_image);
        TextView fruitName = (TextView) view.findViewById(R.id.fruit_name);
        fruitImage.setImageResource(fruit.getImageId());
        fruitName.setText(fruit.getName());
        return view;
    }
}

5、主内容

app\src\main\java\com\example\listviewtest\MainActivity.java

package com.example.listviewtest;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

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

public class MainActivity extends AppCompatActivity {

    private List<Fruit> fruitList = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initFruits();//初始化水果数据
        FruitAdapter adapter = new FruitAdapter(MainActivity.this,R.layout.fruit_item,fruitList);

        ListView listView = (ListView) findViewById(R.id.list_view);
        listView.setAdapter(adapter);
        //响应点击事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                Fruit fruit = fruitList.get(i);
                Toast.makeText(MainActivity.this,fruit.getName(),Toast.LENGTH_SHORT).show();
            }
        });
    }

    private void initFruits(){
        for (int i=0;i<2;i++){
            Fruit apple = new Fruit("Apple",R.drawable.apple_pic);
            fruitList.add(apple);
            Fruit banana = new Fruit("Banana",R.drawable.banana_pic);
            fruitList.add(banana);
            Fruit cherry = new Fruit("Cherry",R.drawable.cherry_pic);
            fruitList.add(cherry);
            Fruit grape = new Fruit("Grape",R.drawable.grape_pic);
            fruitList.add(grape);
            Fruit mango = new Fruit("Mango",R.drawable.mango_pic);
            fruitList.add(mango);
            Fruit orange = new Fruit("Orange",R.drawable.orange_pic);
            fruitList.add(orange);
            Fruit pear = new Fruit("Pear",R.drawable.pear_pic);
            fruitList.add(pear);
            Fruit pineapple = new Fruit("Pineapple",R.drawable.pineapple_pic);
            fruitList.add(pineapple);
            Fruit strawberry = new Fruit("Strawberry",R.drawable.strawberry_pic);
            fruitList.add(strawberry);
            Fruit watermeion = new Fruit("Watermeion",R.drawable.watermeion_pic);
            fruitList.add(watermeion);
        }

    }
}

运行展示：