Windows Phone 實用開發技巧（21）：自動循環播放視頻

In Windows Phone Mango update, we can use VideoBrush since we could not do that in windows phone 7 . So there is something interesting to do. We can develop more fantasitic apps.  For example, we can play a video as background in our application. We want to play video in a loop also. But here comes the problem. Since there is no MediaTimeline in Silverlight for Windows Phone API. How can we repeat media playback ?

In WPF or Silverlight, we can use following code to repeat media playback.

< Page  xmlns ="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x ="http://schemas.microsoft.com/winfx/2006/xaml"   >
   < StackPanel >

     <!--  The MediaElement control plays the sound.  -->
     < MediaElement  Name ="myMediaElement"   >
       < MediaElement.Triggers >
         < EventTrigger  RoutedEvent ="MediaElement.Loaded" >
           < EventTrigger.Actions >
             < BeginStoryboard >
               < Storyboard >

                 <!--  The MediaTimeline has a RepeatBehavior="Forever" which makes the media play
                     over and over indefinitely. -->
                 < MediaTimeline  Source ="media\tada.wav"  Storyboard.TargetName ="myMediaElement"   
                 RepeatBehavior ="Forever"   />

               </ Storyboard >
             </ BeginStoryboard >
           </ EventTrigger.Actions >
         </ EventTrigger >
       </ MediaElement.Triggers >
     </ MediaElement >

   </ StackPanel > </ Page >

 

 In windows phone , I find simple solution to play video in a loop. Since we can catch Media_End event, we can play again in ended event.

 

Another suggestion : do not play large video in your windows phone app since it will cause a little bit performance damage.

Source code can be found here :  

 

 PS:第一次用英文寫技術博客，真D疼，奈何爲了學好E文，只好疼下去了，由於我堅信：疼着疼着就不疼了！