如何使用随时间变化的数据更新Live Tile?

时间:2012-12-08 06:26:00

标签: c# .net-4.0 windows-8 windows-runtime winrt-xaml

My Live Tile跟踪自3种类型事件以来的时间:Event1,Event2,Event3。我希望Live磁贴显示自事件发生以来的时间。

我在后台任务中实现了它,如下面的代码,我想知道它是否是正确的方法呢?

我看到的所有示例都是一次调用Run,因此AddTileNotification仅被调用一次。我修改它是在一个While(真)循环,不确定吗?!

using System;
using System.Threading.Tasks;
using Windows.ApplicationModel.Background;
using Windows.Data.Xml.Dom;
using Windows.Storage;
using Windows.UI.Notifications;


namespace BackgroundTasks
    {    
    public sealed class TileUpdaterClass : IBackgroundTask
        {
        TileUpdater tileUpdater;

        public void Run( IBackgroundTaskInstance taskInstance )
            {
            while ( true )
                {
                BackgroundTaskDeferral deferral = taskInstance.GetDeferral();

                tileUpdater = TileUpdateManager.CreateTileUpdaterForApplication();
                tileUpdater.EnableNotificationQueue( true );

                AddTileNotification( "Since Event1: " + TimeSince( "Event1" ), "tag1", "ms-appx:///Resources/Images/Event1.jpg" );
                AddTileNotification( "Since Event2: " + TimeSince( "Event2" ), "tag2", "ms-appx:///Resources/Images/Event2.jpg" );
                AddTileNotification( "Since Event3: " + TimeSince( "Event3" ), "tag3", "ms-appx:///Resources/Images/Event3.jpg" );

                deferral.Complete();

                Task.Delay( 5000 ); 
                }
            }

        private static string TimeSince( string key )
            {
            TimeSpan since;
            if ( ApplicationData.Current.LocalSettings.Values.ContainsKey( key ) )
                {
                since = new TimeSpan( DateTime.Now.Ticks - ( new DateTime( (long)ApplicationData.Current.LocalSettings.Values[ key ] ) ).Ticks );
                }
            return ( since.Hours.ToString( "D2" ) + ":" + since.Minutes.ToString( "D2" ) + ":" + since.Seconds.ToString( "D2" ) );
            }

        private void AddTileNotification( string content, string tag, string image )
            {
            var templateType = TileTemplateType.TileWideSmallImageAndText04;
            var xml = TileUpdateManager.GetTemplateContent( templateType );

            var textNodes = xml.GetElementsByTagName( "text" );
            textNodes[ 0 ].AppendChild( xml.CreateTextNode( "myApp" ) );
            textNodes[ 1 ].AppendChild( xml.CreateTextNode( content ) );

            var imageNodes = xml.GetElementsByTagName( "image" );
            var elt = (XmlElement)imageNodes[ 0 ];
            elt.SetAttribute( "src", image );

            var tile = new TileNotification( xml );
            tile.Tag = tag;


            tileUpdater.Update( tile );
            }
        }
    }

我还注意到磁贴没有按顺序显示3个事件。时间保持正确但不是订单。这是正常的吗?

谢谢, EitanB

1 个答案:

答案 0 :(得分:0)

是的,这是可以预料的。来自Using the notification queue:

  

显示队列中每个通知的时间长度   它们出现在瓷砖上的顺序基于几个内部   因素并且不能由应用程序控制。