ListView简单使用

最新推荐文章于 2022-05-13 17:28:02 发布

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最新推荐文章于 2022-05-13 17:28:02 发布

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分类专栏： Android 文章标签： android

本文链接：https://blog.youkuaiyun.com/HYY4416/article/details/120258798

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这篇博客介绍了如何在Android中使用ListView，包括布局文件activity_list.xml和activity_list_item.xml的配置，展示了ListView的基本用法。

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package com.example.study01.listview;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;

import com.example.study01.R;

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

/**
 * ListView简单使用
*/

public class ListActivity extends AppCompatActivity {

    private ListView listView;
    private List<Fruit> data = new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_list);
        listView = findViewById(R.id.list_view);

        for (int i = 0; i < 10; i++) {
            Fruit fruit = new Fruit();
            fruit.setName("苹果");
            fruit.setPrice("12.00");
            fruit.setDesc("123qweasd");
            data.add(fruit);
        }
        //数据填充到listView
        listView.setAdapter(new MyAdapter(data, this));
        //Item点击事件setOnItemClickListener
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Log.e("TAG", "ItemClick" + position);
            }
        });

    }
}

package com.example.study01.listview;

public class Fruit {
    String name;
    String price;
    String desc;

    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 String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }
}

package com.example.study01.listview;

import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.study01.R;

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

public class MyAdapter extends BaseAdapter {
    //    private LayoutInflater mLayoutInflater;
    private List<Fruit> data;
    private Context mContext;

    public MyAdapter(List<Fruit> data, Context mContext) {
        this.data = data;
        this.mContext = mContext;
    }

    @Override
    public int getCount() {
        //显示多少个数据
        return data.size();
    }

    @Override
    public Object getItem(int position) {
        return null;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    /**
     * 获取Item 的布局
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder viewHolder = new ViewHolder();
        if (convertView == null) {
            viewHolder = new ViewHolder();
            convertView = LayoutInflater.from(mContext).inflate(R.layout.activity_list_item, parent, false);
            viewHolder.tv_name = convertView.findViewById(R.id.tv_name);
            viewHolder.tv_price = convertView.findViewById(R.id.tv_price);
            viewHolder.tv_desc = convertView.findViewById(R.id.tv_desc);
            convertView.setTag(viewHolder);
        } else {
            viewHolder = (ViewHolder) convertView.getTag();
        }

        //findViewById比较耗时，优化，通过viewHolder类
        /*TextView tv_name = convertView.findViewById(R.id.tv_name);
        tv_name.setText(data.get(position).getName());
        TextView tv_price = convertView.findViewById(R.id.tv_price);
        tv_price.setText(data.get(position).getPrice());
        TextView tv_desc = convertView.findViewById(R.id.tv_desc);
        tv_desc.setText(data.get(position).getDesc());*/

        viewHolder.tv_name.setText(data.get(position).getName());
        viewHolder.tv_price.setText(data.get(position).getPrice());
        viewHolder.tv_desc.setText(data.get(position).getDesc());


        Log.e("TAG", "getView:" + position);
        return convertView;
    }

    private final class ViewHolder {
        TextView tv_name;
        TextView tv_price;
        TextView tv_desc;
    }

}

activity_list.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".listview.ListActivity"
    android:orientation="vertical">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="水果"
        android:textSize="40sp"
        android:gravity="center"
        android:background="#00BCD4"/>
    <ListView
        android:id="@+id/list_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>

</LinearLayout>

activity_list_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/iv"
        android:layout_width="100dp"
        android:layout_height="100dp"
        android:background="@mipmap/orange"
        android:scaleType="centerCrop"
        android:layout_marginRight="20dp"
        />
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">
        <TextView
            android:id="@+id/tv_name"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:textColor="#ff0000"/>
        <TextView
            android:id="@+id/tv_price"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp" />
        <TextView
            android:id="@+id/tv_desc"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20dp"
            android:textColor="#ff9900"
            />
    </LinearLayout>

</LinearLayout>