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【Android】9.2 内置行视图的分类和呈现效果

时间:2016-02-18 08:45:47      阅读:1217      评论:0      收藏:0      [点我收藏+]

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分类:C#、Android、VS2015;

创建日期:2016-02-18

一、简介

Android内置了很多行视图模板,在应用程序中可直接使用这些内置的视图来呈现列表项。

要在ListView中使用内置的行视图呈现列表项,只需要通过Android.Resource.Layout类的属性指定资源的ID即可。例如:

public class MainActivity : Activity
{
    ……
    protected override void OnCreate(Bundle bundle)
    {
        ……
         var listView1 = FindViewById<ListView>(Resource.Id.listView1);
        ArrayAdapter<string> adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.TestListItem);
        listView1.Adapter = adapter;
   }
}

调用adapter对应的方法,可实现添加、删除、插入行的功能。例如:

adapter.Add("Hello");

二、运行截图

本示例演示如何利用继承自BaseAdapter<T>的类,用Android内置的行视图来呈现自定义的列表项。

在主界面中单击【例9-1 内置行视图的分类】,即进入该例子下面的导航界面:

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选择某个内置视图的名称,即可在新的界面中呈现其外观效果。

1、TestListItem:带少量格式的单行文本项(行间距较小)。

2、SimpleListItem1:单行文本项(行间距较大)。

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3、SimpleListItem2:双行文本项。

4、SimpleSelectableListItem:可多行选择的文本项。

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5、SimpleListItemActivated1:单行文本项,与SimpleListItem1相似,但是它用背景色标识选择的项(可多选)。

6、SimpleListItemActivated2:双行文本项,与SimpleListItem2相似,但是它用背景色标识选择的项(可多选)。

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7、SimpleListItemChecked:用“√”标识所选择的文本项(单选)。

8、SimpleListItemMultipleChoice:用复选框标识所选择的文本项(可多选)。

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9、SimpleListItemSingleChoice:用单选按钮标识所选的文本项(单选)。

10、TwoLineListItem:双行文本项。

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11、ActivityListItem:左侧可以带图像的单行文本项。

12、SelectDialogSingleChoice:对话框样式的单选按钮(字体较大)。

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13、其他

除了上面列出的基本行视图以外,还有一些Android系统后来增加的内置视图,比如可折叠和展开的分组项(SimpleExpandableListItem1、SimpleExpandableListItem2)、……等,本项目包含所有章节示例的主界面就是利用可“折叠/展开”的内置视图实现的。

三、主要设计步骤

1、添加图片

先到Android SDK(API 23)的Samples文件夹下找到下面的图,然后将其拖放到项目的drawable文件夹下,并修改文件名添加前缀“ch09”,这样做的目的是为了方便区分是哪一章示例需要的图。

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2、添加ch0901_BuildInViewsMain.axml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:text="单击某项观察呈现效果"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="14dp"
        android:gravity="center_horizontal"
        android:paddingBottom="5dp" />
    <ListView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listView1" />
</LinearLayout>

3、添加ch0901_BuildInViewsResult.axml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:textSize="14dp"
        android:gravity="center_horizontal"
        android:paddingBottom="5dp" />
    <View
        android:layout_width="match_parent"
        android:layout_height="1dip"
        android:background="#FF909090"
        android:layout_marginBottom="5dp" />
    <ListView
        android:minWidth="25px"
        android:minHeight="25px"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/listView1" />
</LinearLayout>

4、添加ch0901MyBaseAdapter.cs文件

using System.Collections.Generic;
using Android.App;
using Android.Views;
using Android.Widget;

namespace MyDemos.SrcDemos
{
    public class ch0901TableItem
    {
        public string Heading { get; set; }
        public string SubHeading { get; set; }
        public int ImageResourceId { get; set; }
    }

    public class ch0901MyBaseAdapter : BaseAdapter<ch0901TableItem>
    {
        private List<ch0901TableItem> items;
        private Activity context;
        private string demoTyoe;
        public ch0901MyBaseAdapter(Activity context, List<ch0901TableItem> items, string demoTyoe)
        {
            this.context = context;
            this.items = items;
            this.demoTyoe = demoTyoe;
        }

        public override ch0901TableItem this[int position]
        {
            get { return items[position]; }
        }

        public override int Count
        {
            get { return items.Count; }
        }

        public override long GetItemId(int position)
        {
            return position;
        }

        public override View GetView(int position, View convertView, ViewGroup parent)
        {
            var listview1 = parent as ListView; //parent.FindViewById<ListView>(Resource.Id.listView1);
            var item = items[position];
            View view = null;
            switch(demoTyoe)
            {
                case "(1)TestListItem":
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.TestListItem, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(2)SimpleListItem1":
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItem1, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(3)SimpleListItem2":
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItem2, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    view.FindViewById<TextView>(Android.Resource.Id.Text2).Text = item.SubHeading;
                    break;
                case "(4)SimpleSelectableListItem":
                    listview1.ChoiceMode = ChoiceMode.Multiple;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleSelectableListItem, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(5)SimpleListItemActivated1":
                    listview1.ChoiceMode = ChoiceMode.Multiple;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItemActivated1, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(6)SimpleListItemActivated2":
                    listview1.ChoiceMode = ChoiceMode.Multiple;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItemActivated2, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    view.FindViewById<TextView>(Android.Resource.Id.Text2).Text = item.SubHeading;
                    break;
                case "(7)SimpleListItemChecked":
                    listview1.ChoiceMode = ChoiceMode.Single;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItemChecked, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(8)SimpleListItemMultipleChoice":
                    listview1.ChoiceMode = ChoiceMode.Multiple;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItemMultipleChoice, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(9)SimpleListItemSingleChoice":
                    listview1.ChoiceMode = ChoiceMode.Single;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SimpleListItemSingleChoice, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
                case "(10)TwoLineListItem":
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.TwoLineListItem, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    view.FindViewById<TextView>(Android.Resource.Id.Text2).Text = item.SubHeading;
                    break;
                case "(11)ActivityListItem":
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.ActivityListItem, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    view.FindViewById<ImageView>(Android.Resource.Id.Icon).SetImageResource(item.ImageResourceId);
                    break;
                case "(12)SelectDialogSingleChoice":
                    listview1.ChoiceMode = ChoiceMode.Single;
                    view = context.LayoutInflater.Inflate(Android.Resource.Layout.SelectDialogSingleChoice, null);
                    view.FindViewById<TextView>(Android.Resource.Id.Text1).Text = item.Heading;
                    break;
            }
            return view;
        }
    }
}

5、添加ch0901BuildInViewsResult.cs文件

using System.Collections.Generic;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Widget;

namespace MyDemos.SrcDemos
{
    [Activity(Label = "【例9-1】内置行视图的分类")]
    public class ch0901BuildInViewsResult : Activity
    {
        List<ch0901TableItem> items = new List<ch0901TableItem>();
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.ch0901_BuildInViewsResult);

            items.Add(new ch0901TableItem() { Heading = "蔬菜类(Vegetables)", SubHeading = "65项", ImageResourceId = Resource.Drawable.ch09Vegetables });
            items.Add(new ch0901TableItem() { Heading = "水果类(Fruits)", SubHeading = "17项", ImageResourceId = Resource.Drawable.ch09Fruits });
            items.Add(new ch0901TableItem() { Heading = "花蕾类(Flower Buds)", SubHeading = "5项", ImageResourceId = Resource.Drawable.ch09FlowerBuds });
            items.Add(new ch0901TableItem() { Heading = "豆类(Legumes)", SubHeading = "33项", ImageResourceId = Resource.Drawable.ch09Legumes });
            items.Add(new ch0901TableItem() { Heading = "圆疙瘩类(Bulbs)", SubHeading = "18项", ImageResourceId = Resource.Drawable.ch09Bulbs });
            items.Add(new ch0901TableItem() { Heading = "块茎类(Tubers)", SubHeading = "43项", ImageResourceId = Resource.Drawable.ch09Tubers });

            string demoType = Intent.GetStringExtra("demoType");
            var textView1 = FindViewById<TextView>(Resource.Id.textView1);
            textView1.Text= demoType;
            ch0901MyBaseAdapter adapter = new ch0901MyBaseAdapter(this, items, demoType);

            var listView1 = FindViewById<ListView>(Resource.Id.listView1);
            listView1.Adapter = adapter;
        }
    }
}

6、添加ch0901_BuildInViewsMain.axml文件

using System.Collections.Generic;
using Android.App;
using Android.Content;
using Android.OS;
using Android.Widget;

namespace MyDemos.SrcDemos
{
    [Activity(Label = "【例9-1】内置行视图的分类")]
    public class ch0901BuildInViewsMain : Activity
    {
        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            SetContentView(Resource.Layout.ch0901_BuildInViewsMain);
            List<string> list = new List<string>()
            {
                "(1)TestListItem",
                "(2)SimpleListItem1",
                "(3)SimpleListItem2",
                "(4)SimpleSelectableListItem",
                "(5)SimpleListItemActivated1",
                "(6)SimpleListItemActivated2",
                "(7)SimpleListItemChecked",
                "(8)SimpleListItemMultipleChoice",
                "(9)SimpleListItemSingleChoice",
                "(10)TwoLineListItem",
                "(11)ActivityListItem",
                "(12)SelectDialogSingleChoice",
            };
            ArrayAdapter<string> adapter = new ArrayAdapter<string>(this, Android.Resource.Layout.TestListItem);
            adapter.AddAll(list);
            var listView1 = FindViewById<ListView>(Resource.Id.listView1);
            listView1.Adapter = adapter;
            listView1.ItemClick += (s, e) =>
            {
                Intent intent = new Intent(this,typeof(ch0901BuildInViewsResult));
                intent.PutExtra("demoType", list[e.Position]);
                StartActivity(intent);
            };
        }
    }
}

【Android】9.2 内置行视图的分类和呈现效果

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原文地址:http://www.cnblogs.com/rainmj/p/5197019.html

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