Xamarin Android ListView 控制項使用

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在項目中通常用到了ListView控制項，樣本如下：

create the listitem class ，eg;

public class ColorItem    {        public string ColorName { get; set; }        public string Code { get; set; }        public Android.Graphics.Color Color { get; set; }    }

create Adapter class: 

Adapter類需要實現BaseAdapter, 並且需要在GetView method中指定，自訂ListItem的頁面。得到listitem,中的控制項值進行給值。

public class ColorAdapter : BaseAdapter<ColorItem>    {        List<ColorItem> items;        Activity context;        public ColorAdapter(Activity context, List<ColorItem> items) : base()        {            this.context = context;            this.items = items;        }        public override ColorItem this[int position] => items[position];        public override int Count => items.Count;        public override long GetItemId(int position)        {            return position;        }        public override View GetView(int position, View convertView, ViewGroup parent)        {            var item = items[position];            View view = convertView;            if (null == view)            {                view = context.LayoutInflater.Inflate(Resource.Layout.ListItem,null);            }            view.FindViewById<TextView>(Resource.Id.textView1).Text = item.ColorName;            view.FindViewById<TextView>(Resource.Id.textView2).Text = item.Code;            view.FindViewById<ImageView>(Resource.Id.imageView1).SetBackgroundColor(item.Color);            return view;        }    }

Main.axml添加ListView控制項。後台代碼如下；

public class MainActivity : Activity    {        List<ColorItem> colorItems = new List<ColorItem>();        ListView listView = null;        protected override void OnCreate(Bundle savedInstanceState)        {            base.OnCreate(savedInstanceState);            // Set our view from the "main" layout resource            SetContentView(Resource.Layout.Main);            listView = FindViewById<ListView>(Resource.Id.myListView);            colorItems.Add(new ColorItem() { Color = Android.Graphics.Color.DarkRed,ColorName="Dark Red",Code="8B0000"});            colorItems.Add(new ColorItem() { Color = Android.Graphics.Color.SlateBlue, ColorName = "Slate Blue", Code = "Ga5ACD" });            colorItems.Add(new ColorItem() { Color = Android.Graphics.Color.ForestGreen, ColorName = "Forest Green", Code = "228B22" });            listView.Adapter = new ColorAdapter(this,colorItems);        }    }

運行效果如下：

 

Xamarin Android ListView 控制項使用