Windows Phone 實用開發技巧（21）：自動迴圈播放視頻

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部落格，真D疼，奈何為了學好E文，只好疼下去了，因為我堅信：疼著疼著就不疼了！