• Android : ListView + BaseAdapter-2简单应用

     ​​容器与适配器：​​​​​        http://t.csdnimg.cn/ZfAJ7

    实体类 News.java

    1. package com.example.mylistviewadapter2.entity;
    2.  
    3.  
    4. public class News {
    5.     private   String title;
    6.     private  String content;
    7.     private int img;
    8.  
    9.     public News(String title, String content, int img){
    10.         this.title = title;
    11.         this.content = content;
    12.         this.img =img;
    13.     }
    14.  
    15.     public String getTitile() {
    16.         return title;
    17.     }
    18.  
    19.     public void setTitile(String title) {
    20.         this.title = title;
    21.     }
    22.  
    23.     public String getContent() {
    24.         return content;
    25.     }
    26.  
    27.     public void setContent(String content) {
    28.         this.content = content;
    29.     }
    30.  
    31.     public int getImg() {
    32.         return img;
    33.     }
    34.  
    35.     public void setImg(int img) {
    36.         this.img = img;
    37.     }
    38. }

    适配器 写个类继承BaseAdapter 

    1. package com.example.mylistviewadapter2;
    2.  
    3. import android.content.Context;
    4. import android.view.LayoutInflater;
    5. import android.view.View;
    6. import android.view.ViewGroup;
    7. import android.widget.BaseAdapter;
    8. import android.widget.ImageView;
    9. import android.widget.TextView;
    10.  
    11. import com.example.mylistviewadapter2.entity.News;
    12.  
    13. import java.util.List;
    14.  
    15. public class NewsAdpater extends BaseAdapter {
    16.     private List date;
    17.     private Context context;
    18.     //两个标记类
    19.     private  static final  int TYPE_NEWS_1 = 0;
    20.     private  static final  int TYPE_NEWS_2 = 1;
    21.     //構造器
    22.     public NewsAdpater(List date, Context context){
    23.         this.date = date;
    24.         this.context = context;
    25.     }
    26.  
    27.     //BaseAdapter最基本的几个方法：
    28.     // 1. getCount 填充的数据集数
    29.     // 2.getItem 数据集中指定索引对应的数据项
    30.     // 3. getItemId 指定行所对应的ID
    31.     // 4. getView 每个Item所显示的类容
    32.  
    33.     @Override
    34.     public int getCount() {
    35.         //充的数据集数
    36.         return date.size();
    37.     }
    38.  
    39.     @Override
    40.     public Object getItem(int position) {
    41.         //数据集中指定索引对应的数据项
    42.         return date.get(position);
    43.     }
    44.  
    45.     @Override
    46.     public long getItemId(int position) {
    47.         // 指定行所对应的ID
    48.         return position;
    49.     }
    50.  
    51.     //重写 getItemViewType 返回对应的item布局类型
    52.     @Override
    53.     public int getItemViewType(int position) {
    54.        if(position % 2 == 0){
    55.            return TYPE_NEWS_1;
    56.        }else{
    57.            return TYPE_NEWS_2;
    58.         }
    59.     }
    60.     //重写 getViewTypeCount 返回总共有几个item布局类型
    61.     @Override
    62.     public int getViewTypeCount() {
    63.         return 2;
    64.     }
    65.  
    66.     //优化
    67.     @Override
    68.     public View getView(int position, View convertView, ViewGroup parent) {
    69.         //获取布局类型
    70.         int type = getItemViewType(position);
    71.  
    72.         ViewHoler holer = null;
    73.         ViewHoler2 holer2 = null;
    74.         if(convertView == null){
    75.             switch (type){
    76.                 case TYPE_NEWS_1:
    77.                     holer = new ViewHoler();
    78.                     //每个Item所显示的类容
    79.                     convertView =  LayoutInflater.from(context).inflate(R.layout.left_list_view,parent,false);
    80.                     holer.imageView = convertView.findViewById(R.id.btnImg);
    81.                     holer.tvTitle = convertView.findViewById(R.id.tvH);
    82.                     holer.tbCont = convertView.findViewById(R.id.tvCont);
    83.  
    84.                     convertView.setTag(holer);
    85.                     break;
    86.                 case TYPE_NEWS_2:
    87.                     holer2 = new ViewHoler2();
    88.                     //每个Item所显示的类容
    89.                     convertView =  LayoutInflater.from(context).inflate(R.layout.right_list_view,parent,false);
    90.                     holer2.imageView = convertView.findViewById(R.id.btnImg2);
    91.                     holer2.tvTitle = convertView.findViewById(R.id.tvH2);
    92.                     holer2.tbCont = convertView.findViewById(R.id.tvCont2);
    93.  
    94.                     convertView.setTag(holer2);
    95.                     break;
    96.             }
    97.  
    98.         }else {
    99.             switch (type){
    100.                 case TYPE_NEWS_1:
    101.                     holer = (ViewHoler)convertView.getTag();
    102.                     break;
    103.                 case  TYPE_NEWS_2:
    104.                     holer2 = (ViewHoler2)convertView.getTag();
    105.                     break;
    106.  
    107.             }
    108.         }
    109.  
    110.         switch (type){
    111.             case TYPE_NEWS_1:
    112.                 //摄入值
    113.                 holer.imageView.setBackgroundResource(date.get(position).getImg());
    114.                 holer.tvTitle.setText(date.get(position).getTitile());
    115.                 holer.tbCont.setText(date.get(position).getContent());
    116.                 break;
    117.             case TYPE_NEWS_2:
    118.                 //摄入值
    119.                 holer2.imageView.setBackgroundResource(date.get(position).getImg());
    120.                 holer2.tvTitle.setText(date.get(position).getTitile());
    121.                 holer2.tbCont.setText(date.get(position).getContent());
    122.                break;
    123.         }
    124.  
    125.         return convertView;
    126.     }
    127.     static class ViewHoler{
    128.         ImageView imageView;
    129.         TextView tvTitle;
    130.         TextView tbCont;
    131.     }
    132.  
    133.     static class ViewHoler2{
    134.         ImageView imageView;
    135.         TextView tvTitle;
    136.         TextView tbCont;
    137.     }
    138. }

    MainActivity.java

    1. package com.example.mylistviewadapter2;
    2.  
    3. import static android.widget.Toast.LENGTH_SHORT;
    4.  
    5. import androidx.appcompat.app.AppCompatActivity;
    6.  
    7. import android.content.Context;
    8. import android.os.Bundle;
    9. import android.view.View;
    10. import android.widget.AdapterView;
    11. import android.widget.ListView;
    12. import android.widget.Toast;
    13.  
    14. import com.example.mylistviewadapter2.entity.News;
    15.  
    16. import java.util.ArrayList;
    17. import java.util.List;
    18.  
    19. public class MainActivity extends AppCompatActivity {
    20.     //
    21.     private ListView listView;
    22.     private Context context;
    23.     private List listNews =null;
    24.  
    25.     //适配器
    26.     private  NewsAdpater newsAdpater=null;
    27.     @Override
    28.     protected void onCreate(Bundle savedInstanceState) {
    29.         super.onCreate(savedInstanceState);
    30.         setContentView(R.layout.activity_main);
    31.         context = this;
    32.  
    33.         listView = findViewById(R.id.listVi);
    34.  
    35.         listNews = new ArrayList<>();
    36.         //传入内容
    37.         for(int i= 0 ; i < 10; i++){
    38.             listNews.add(new News("这是标题"+i,"我是内容我是内容我是内容我是内容我是内容我是内容我是内容"+i,R.mipmap.bg));
    39.         }
    40.         newsAdpater = new NewsAdpater(listNews,context);
    41.  
    42.         listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
    43.             @Override
    44.             public void onItemClick(AdapterView parent, View view, int position, long id) {
    45.                 Toast.makeText(context, "点击了第" + position + "条数据", LENGTH_SHORT).show();
    46.             }
    47.         });
    48.         //往容器设置适配器
    49.         listView.setAdapter(newsAdpater);
    50.     }
    51.  
    52. }

    activity_main.xml

    1. "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:orientation="vertical"
    7.     android:layout_height="match_parent"
    8.     tools:context=".MainActivity">
    9.  
    10.     <ListView
    11.         android:id="@+id/listVi"
    12.         android:layout_width="match_parent"
    13.         android:layout_height="wrap_content"/>
    14.  
    15. LinearLayout>

    left_list_view.xml

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     android:layout_width="match_parent"
    4.     android:descendantFocusability="blocksDescendants"
    5.     android:layout_height="match_parent">
    6.     
    7.     <ImageView
    8.         android:id="@+id/btnImg"
    9.         android:layout_width="200dp"
    10.         android:layout_height="100dp"
    11.         android:scaleType="fitXY"
    12.         android:src="@mipmap/bg"
    13.         />
    14.     <LinearLayout
    15.         android:orientation="vertical"
    16.         android:layout_width="match_parent"
    17.         android:layout_height="wrap_content">
    18.         <TextView
    19.             android:id="@+id/tvH"
    20.             android:layout_width="match_parent"
    21.             android:layout_height="wrap_content"
    22.             android:text="我是标题"
    23.             android:gravity="center"
    24.             android:textSize="16sp"
    25.             android:textStyle="bold"
    26.             />
    27.         <ScrollView
    28.             android:layout_width="match_parent"
    29.             android:layout_height="wrap_content">
    30.  
    31.         <TextView
    32.             android:id="@+id/tvCont"
    33.             android:layout_marginTop="10px"
    34.             android:layout_width="match_parent"
    35.             android:layout_height="wrap_content"
    36.             android:text="我是内容文本asdfasdfasdfasdfasdfasdfs"
    37.             android:textSize="12sp"
    38.             android:textStyle=""
    39.             />
    40.         ScrollView>
    41.     LinearLayout>
    42. LinearLayout>

    right_list_view.xml

    1. "1.0" encoding="utf-8"?>
    2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    3.     android:layout_width="match_parent"
    4.     android:descendantFocusability="blocksDescendants"
    5.     android:layout_height="match_parent">
    6.     
    7.  
    8.     <LinearLayout
    9.         android:orientation="vertical"
    10.         android:layout_width="200dp"
    11.         android:layout_height="100dp">
    12.         <TextView
    13.             android:id="@+id/tvH2"
    14.             android:layout_width="match_parent"
    15.             android:layout_height="wrap_content"
    16.             android:text="我是标题"
    17.             android:gravity="center"
    18.             android:textSize="16sp"
    19.             android:textStyle="bold"
    20.             />
    21.         <ScrollView
    22.             android:layout_width="match_parent"
    23.             android:layout_height="wrap_content">
    24.  
    25.             <TextView
    26.                 android:id="@+id/tvCont2"
    27.                 android:layout_marginTop="10px"
    28.                 android:layout_width="match_parent"
    29.                 android:layout_height="wrap_content"
    30.                 android:text="我是内容文本asdfasdfasdfasdfasdfasdfs"
    31.                 android:textSize="12sp"
    32.                 android:textStyle=""
    33.                 />
    34.         ScrollView>
    35.     LinearLayout>
    36.  
    37.     <ImageView
    38.         android:id="@+id/btnImg2"
    39.         android:layout_width="200dp"
    40.         android:layout_height="100dp"
    41.         android:scaleType="fitXY"
    42.         android:src="@mipmap/bg"
    43.         />
    44. LinearLayout>

  • 相关阅读:
    什么是自我接纳？如何提高自我接纳度？
    我的 Kafka 旅程 - broker
    所有Linux发行版存在shim漏洞；多个国家黑客利用AI进行网络攻击；美国挫败俄方网络间谍活动网络 | 安全周报 0216
    数据结构和算法训练：第二十五弹
    web前端零基础入门2
    openresty 的lua在返回响应后再日志里添加自定义的状态
    c++数据结构之实现链表操作
    安卓sd卡格式化数据恢复方法，您了解吗
    周一见！距离阿里巴巴开源开放周还有3天
    Wails简介
  • 原文地址：https://blog.csdn.net/jiayou2020527/article/details/134537382