XamarinAndroid_BaseAdapter 简单的复用

Xamarin-Android_BaseAdapter 简单的复用

缘由:

　　本人是一枚小菜初学Xamarin-Android 正在学习ListView 控件发现这个控件的自定义布局用的那叫一个爽字了得。

但是每次用ListView的时候都要继承一下BaseAdapter 这就不爽了。好气啊，我这个人非常的懒只好寻求改良之法。

　　写这篇博客在这里献丑甚是尴尬啊，还请园子里的诸位大咖多多指正。小弟不胜感激！【谢谢O(∩_∩)O哈！】

小弟学识浅薄仅仅做了以下的改良之处

抽取泛型因为基本上的是大同小异的只是类型的不同如这次是 Person 类型下次可能就是 Student 类型的区别而已所以就想到了泛型
将对 View 进行赋值的方法使用委托进行替换。因为除了类型不同之外也就这点不同了

下面是效果图自己都感觉丑丑哭了 (⊙o⊙)…

代码奉上

ListItem的布局代码

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="horizontal"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent"
 6     android:minWidth="25px"
 7     android:minHeight="25px">
 8     <ImageView
 9         android:layout_width="89.5dp"
10         android:layout_height="67.5dp"
11         android:id="@+id/imgHard" />
12     <LinearLayout
13         android:orientation="vertical"
14         android:minWidth="25px"
15         android:minHeight="25px"
16         android:layout_width="200dp"
17         android:layout_height="67.5dp"
18         android:id="@+id/linearLayout1">
19         <TextView
20             android:text="Large Text"
21             android:textAppearance="?android:attr/textAppearanceLarge"
22             android:layout_width="279.5dp"
23             android:layout_height="wrap_content"
24             android:id="@+id/txtName" />
25         <TextView
26             android:text="Small Text"
27             android:textAppearance="?android:attr/textAppearanceSmall"
28             android:layout_width="match_parent"
29             android:layout_height="wrap_content"
30             android:id="@+id/txtDesc"
31             android:textSize="12dp" />
32     </LinearLayout>
33     <Button
34         android:text="查看信息"
35         android:layout_width="wrap_content"
36         android:layout_height="67.5dp"
37         android:id="@+id/button1" />
38 </LinearLayout>

主界面的代码

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="vertical"
 4     android:layout_width="match_parent"
 5     android:layout_height="match_parent">
 6     <ListView
 7         android:minWidth="25px"
 8         android:minHeight="25px"
 9         android:layout_width="match_parent"
10         android:layout_height="match_parent"
11         android:id="@+id/itemsPerson"
12         android:divider="@android:color/white"
13         android:dividerHeight="3dp"
14         android:descendantFocusability="afterDescendants" />
15 </LinearLayout>

AllRoundBaseAdapter代码

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 
 6 using Android.App;
 7 using Android.Content;
 8 using Android.OS;
 9 using Android.Runtime;
10 using Android.Views;
11 using Android.Widget;
12 
13 namespace AdapterStudy_20170301
14 {
15     public class AllRoundAdapter<T> : BaseAdapter<T>
16     {
17         #region 全局变量
18         /// <summary>
19         /// 上下文
20         /// </summary>
21         public Activity MyContext { get; set; }
22 
23         /// <summary>
24         /// 数据源
25         /// </summary>
26         public List<T> MyDataSource { get; set; }
27 
28         /// <summary>
29         /// Item 布局资源
30         /// </summary>
31         public int LayoutSource { get; set; }
32 
33         /// <summary>
34         /// 执行的委托
35         /// </summary>
36         Action<View, T> MyAction;
37         #endregion
38 
39         /// <summary>
40         /// 建立 AllRoundBaseAdapter
41         /// </summary>
42         /// <param name="actity">上下文</param>
43         /// <param name="listDataSource">数据源</param>
44         /// <param name="layoutSource">布局ID</param>
45         /// <param name="action">为布局赋值用到的方法</param>
46         public AllRoundAdapter(Activity actity, List<T> listDataSource, int layoutSource, Action<View, T> action)
47         {
48             this.MyContext = actity;
49             this.MyDataSource = listDataSource;
50 
51             this.LayoutSource = layoutSource;
52 
53             this.MyAction = action;
54         }
55 
56         public override T this[int position]
57         {
58             get
59             {
60                 return MyDataSource[position];
61             }
62         }
63 
64         public override int Count
65         {
66             get
67             {
68                 return this.MyDataSource.Count;
69             }
70         }
71 
72         public override long GetItemId(int position)
73         {
74             return position;
75         }
76 
77         public override View GetView(int position, View convertView, ViewGroup parent)
78         {
79             T t = this.MyDataSource[position];
80 
81             View v = convertView;
82             if (v == null)
83             {
84                 v = this.MyContext.LayoutInflater.Inflate(this.LayoutSource, null);
85             }
86 
87             if (this.MyAction != null)
88             {
89                 this.MyAction.Invoke(v, t);
90             }
91 
92             return v;
93         }
94     }
95 }

MainActivity的代码

 1 using System;
 2 using Android.App;
 3 using Android.Content;
 4 using Android.Runtime;
 5 using Android.Views;
 6 using Android.Widget;
 7 using Android.OS;
 8 using System.Collections.Generic;
 9 using Javax.Crypto;
10 
11 namespace AdapterStudy_20170301
12 {
13     [Activity(Label = "AdapterStudy_20170301", MainLauncher = true, Icon = "@drawable/icon")]
14     public class MainActivity : Activity
15     {
16 
17         private ListView lvPerson;
18         private List<Person> listPerson = new List<Person>();
19 
20         protected override void OnCreate(Bundle bundle)
21         {
22             base.OnCreate(bundle);
23 
24             // Set our view from the "main" layout resource
25             SetContentView(Resource.Layout.Main);
26 
27 
28             lvPerson = FindViewById<ListView>(Resource.Id.itemsPerson);
29 
30             //填充一些数据
31             this.listPerson.Add(new Person("张飞", Resource.Drawable.person, "张翼德"));
32             this.listPerson.Add(new Person("刘备", Resource.Drawable.person, "刘玄德"));
33             this.listPerson.Add(new Person("关羽", Resource.Drawable.person, "关云长"));
34             this.listPerson.Add(new Person("张飞", Resource.Drawable.person, "张翼德"));
35             this.listPerson.Add(new Person("刘备", Resource.Drawable.person, "刘玄德"));
36             this.listPerson.Add(new Person("关羽", Resource.Drawable.person, "关云长"));
37             this.listPerson.Add(new Person("张飞", Resource.Drawable.person, "张翼德"));
38             this.listPerson.Add(new Person("刘备", Resource.Drawable.person, "刘玄德"));
39             this.listPerson.Add(new Person("张飞", Resource.Drawable.person, "张翼德"));
40             this.listPerson.Add(new Person("刘备", Resource.Drawable.person, "刘玄德"));
41             this.listPerson.Add(new Person("关羽", Resource.Drawable.person, "关云长"));
42             this.listPerson.Add(new Person("关羽", Resource.Drawable.person, "关云长"));
43 
44             //设置表头表尾
45             View header = this.LayoutInflater.Inflate(Resource.Layout.HeaderLayout, null);
46             View footer = this.LayoutInflater.Inflate(Resource.Layout.FooterLayout, null);
47 
48             this.lvPerson.AddHeaderView(header);
49             this.lvPerson.AddFooterView(footer);
50 
51             //使用泛型的Adapter 进行赋值
52             lvPerson.Adapter = new AllRoundAdapter<Person>(this, listPerson, Resource.Layout.ListViewItemLayout,
53                 (x, y) =>
54                 {
55                     x.FindViewById<TextView>(Resource.Id.txtName).Text = y.Name;
56                     x.FindViewById<TextView>(Resource.Id.txtDesc).Text = y.Desc;
57                     x.FindViewById<ImageView>(Resource.Id.imgHard).SetBackgroundResource(y.Image);
58                 });
59 
60         }
61     }
62 }

学识浅薄，请多多指正，多多关照！感觉自己好菜掩面而逃。

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