BaseAdapter和ListView的设计

最新推荐文章于 2025-08-08 23:51:41 发布

转载最新推荐文章于 2025-08-08 23:51:41 发布 · 61 阅读

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原文链接：http://www.cnblogs.com/633sylss/p/5477013.html

文章标签：

#移动开发 #java

本文详细介绍了如何使用BaseAdapter实现ListView的数据展示，包括创建布局文件、定义数据源类、初始化适配器并加载数据的过程。通过实例演示了如何在Android应用中高效地展示数据。

摘要生成于 C知道，由 DeepSeek-R1 满血版支持，前往体验 >

步骤：1新建activity_main.xml布局，包括ListView控件

2新建main.xml布局，为每个子控件设置属性

3新建数据源ItemBean类，里面包括子控件需要的东西，

4新建MainActivity类，加载数据源，用List集合，之后初始化适配器，加载适配器

5新建适配器MyAdapt，继承BaseAdapter

注意：把xml文件转换为view视图，用View view=LayouInflater.from(context).inflater(R.layout.main,null);

Main

 1 package baseadaptdemo.example.administrator.baseadaptdemo;
 2 
 3 import android.support.v7.app.AppCompatActivity;
 4 import android.os.Bundle;
 5 import android.widget.ListView;
 6 
 7 import java.util.ArrayList;
 8 import java.util.List;
 9 
10 public class MainActivity extends AppCompatActivity {
11 private List<ItemBean> beanList;
12     private MyAdapt myAdapt;
13     @Override
14     protected void onCreate(Bundle savedInstanceState) {
15         super.onCreate(savedInstanceState);
16         setContentView(R.layout.activity_main);
17         ListView listView= (ListView) findViewById(R.id.list_item);
18         beanList=new ArrayList<>();
19         for (int i=0;i<20;i++){
20             beanList.add(new ItemBean(R.mipmap.ic_launcher,
21                     "我是标题"+i,
22                     "我是内容"+i));
23         }
24         myAdapt=new MyAdapt(this,beanList);
25         listView.setAdapter(myAdapt);
26     }
27 }

ItemBean类

 1 package baseadaptdemo.example.administrator.baseadaptdemo;
 2 
 3 import android.widget.ImageView;
 4 import android.widget.TextView;
 5 
 6 /**
 7  * Created by Administrator on 2016/5/9.
 8  */
 9 /*alt+insert:调用出构造方法*/
10 public class ItemBean {
11 
12     public int itemImageResid;
13     public String itemTitle;
14     public String itemContent;
15 
16     public ItemBean(int itemImageResid, String itemTitle, String itemContent) {
17         this.itemImageResid = itemImageResid;
18         this.itemTitle = itemTitle;
19         this.itemContent = itemContent;
20     }
21 }

MyAdapt

 1 package baseadaptdemo.example.administrator.baseadaptdemo;
 2 
 3 import android.content.Context;
 4 import android.provider.Settings;
 5 import android.util.Log;
 6 import android.view.LayoutInflater;
 7 import android.view.View;
 8 import android.view.ViewGroup;
 9 import android.widget.BaseAdapter;
10 import android.widget.ImageView;
11 import android.widget.TextView;
12 
13 import java.util.List;
14 
15 /**
16  * Created by Administrator on 2016/5/9.
17  */
18 public class MyAdapt extends BaseAdapter {
19     private List<ItemBean> mList;
20     private LayoutInflater mLayoutInflater;
21 
22     public MyAdapt(Context context,List<ItemBean> beanList) {
23         this.mList=beanList;
24         mLayoutInflater=LayoutInflater.from(context);/*为minflater初始化*/
25     }
26 
27     @Override
28     public int getCount() {
29         return mList.size();
30     }
31 
32     @Override
33     public Object getItem(int position) {
34         return mList.get(position);
35     }
36 
37     @Override
38     public long getItemId(int position) {
39         return position;
40     }
41 
42     @Override
43     public View getView(int position, View convertView, ViewGroup parent) {
44         long start=System.nanoTime();/*获取纳秒时间*/
45        /*逗比式*/
46         /*View view=mLayoutInflater.inflate(R.layout.main,null);
47         ImageView imageView= (ImageView) view.findViewById(R.id.iv_image);
48         TextView tv_title= (TextView) view.findViewById(R.id.tv_title);
49         TextView tv_context= (TextView) view.findViewById(R.id.tv_context);
50         imageView.setImageResource(mList.get(position).itemImageResid);
51         tv_title.setText(mList.get(position).itemTitle);
52         tv_context.setText(mList.get(position).itemContent);
53         return view;*/
54         /*普通式*/
55         /*if (convertView == null) {
56             convertView = mLayoutInflater.inflate(R.layout.main, null);
57         }
58         ImageView imageView = (ImageView) convertView.findViewById(R.id.iv_image);
59         TextView tv_title = (TextView) convertView.findViewById(R.id.tv_title);
60         TextView tv_context = (TextView) convertView.findViewById(R.id.tv_context);
61         imageView.setImageResource(mList.get(position).itemImageResid);
62         tv_title.setText(mList.get(position).itemTitle);
63         tv_context.setText(mList.get(position).itemContent);
64         return convertView;*/
65 
66         ViewHolder viewHolder=null;
67         if (convertView == null) {
68             convertView = mLayoutInflater.inflate(R.layout.main, null);
69             viewHolder=new ViewHolder();
70             viewHolder.imageView = (ImageView) convertView.findViewById(R.id.iv_image);
71             viewHolder.tv_title = (TextView) convertView.findViewById(R.id.tv_title);
72             viewHolder.tv_context = (TextView) convertView.findViewById(R.id.tv_context);
73             convertView.setTag(viewHolder);
74         }else{
75             viewHolder= (ViewHolder) convertView.getTag();
76         }
77 
78        viewHolder. imageView.setImageResource(mList.get(position).itemImageResid);
79        viewHolder. tv_title.setText(mList.get(position).itemTitle);
80         viewHolder.tv_context.setText(mList.get(position).itemContent);
81         long end= System.nanoTime();
82         long dValue=end-start;
83         long sum=0;
84          sum=sum+dValue;
85         Log.d("Main","sum");
86         return convertView;
87 
88 
89     }
90     class ViewHolder{
91         public ImageView imageView;
92         public TextView tv_title;
93         public TextView tv_context;
94     }
95 }

activity_main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     xmlns:tools="http://schemas.android.com/tools"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:paddingBottom="@dimen/activity_vertical_margin"
 7     android:paddingLeft="@dimen/activity_horizontal_margin"
 8     android:paddingRight="@dimen/activity_horizontal_margin"
 9     android:paddingTop="@dimen/activity_vertical_margin"
10     tools:context="baseadaptdemo.example.administrator.baseadaptdemo.MainActivity">
11 
12     <ListView
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:id="@+id/list_item"></ListView>
16 </RelativeLayout>

main.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3 
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     >
 7 <ImageView
 8     android:layout_width="80dp"
 9     android:layout_height="80dp"
10     android:id="@+id/iv_image"
11     android:background="@mipmap/ic_launcher"/>
12     <TextView
13         android:layout_width="match_parent"
14         android:layout_height="40dp"
15         android:layout_toEndOf="@+id/iv_image"
16         android:gravity="center"
17         android:textSize="25sp"
18         android:id="@+id/tv_title"
19         android:text="Title"/>
20     <TextView
21         android:layout_width="match_parent"
22         android:layout_height="40dp"
23         android:gravity="center"
24         android:id="@+id/tv_context"
25         android:layout_below="@+id/tv_title"
26         android:layout_toEndOf="@+id/iv_image"
27         android:text="context"
28         android:textSize="20sp"/><!--layout_below用于设置在一控件之下
29         layout_toEndOf用于设置在一控件末尾-->
30 </RelativeLayout>

转载于:https://www.cnblogs.com/633sylss/p/5477013.html