动态LiveTile -添加背景图像

本文关键字：背景 图像 添加 LiveTile 动态 | 更新日期: 2023-09-27 18:13:42

在我的Windows Phone 7应用程序中使用动态磁贴，它工作得很好。

我现在试图创建一个动态的活动磁贴，我不能得到背景图像显示。当使用下面的代码，我只得到一个黑色的瓷砖。我添加的文本显示，但不是背景图像。图片"Build action"设置为"Content"

任何想法?

StackPanel sp = new StackPanel();
sp.Height = 173;
sp.Width = 173;
string fileName = "tile.jpg";
BitmapImage image = new BitmapImage(new Uri(fileName, UriKind.Relative));
ImageBrush brush = new ImageBrush();
brush.ImageSource = image;
sp.Background = brush;
sp.Measure(new Size(173, 173));
sp.Arrange(new Rect(0, 0, 173, 173));
sp.UpdateLayout();
WriteableBitmap wbm = new WriteableBitmap(173, 173);
wbm.Render(sp, null);
wbm.Invalidate();

动态LiveTile -添加背景图像

我也有问题使用BitmapImage，仍然不知道如何解决它。但是我发现了一个使用WriteableBitmap的解决方案:

        // grid is container for image and text
        Grid grid = new Grid();
        // load your image
        StreamResourceInfo info = Application.GetResourceStream(new Uri(filename, UriKind.Relative));
        // create source bitmap for Image control (image is assumed to be alread 173x173)
        WriteableBitmap wbmp2 = new WriteableBitmap(1,1);
        wbmp2.SetSource(info.Stream);
        Image img = new Image();
        img.Source = wbmp2;
        // add Image to Grid
        grid.Children.Add(img);
        TextBlock text = new TextBlock() { FontSize = (double)Resources["PhoneFontSizeExtraLarge"], Foreground = new SolidColorBrush(Colors.White) };
        // your text goes here:
        text.Text = "Hello'nWorld";
        grid.Children.Add(text);
        // this is our final image containing custom text and image
        WriteableBitmap wbmp = new WriteableBitmap(173, 173);
        // now render everything - this image can be used as background for tile
        wbmp.Render(grid, null);
        wbmp.Invalidate();

试试这个-它对我有效:

Uri uri = new Uri("tile.jpg", UriKind.Relative);
StreamResourceInfo sri = Application.GetResourceStream(uri);
WriteableBitmap wbm = new WriteableBitmap(173, 173);
wbm.SetSource(sri.Stream);
using (var stream = IsolatedStorageFile.GetUserStoreForApplication().CreateFile("/Shared/ShellContent/tile.png"))
{
    wbm.SaveJpeg(stream, 173, 173, 0, 100);
}
var data = new StandardTileData();
data.BackgroundImage = new Uri("isostore:/Shared/ShellContent/tile.png", UriKind.Absolute);
data.Title = "updated image";
var tile = ShellTile.ActiveTiles.First();
tile.Update(data);

我认为问题是图像正在异步加载，因此不可用。我成功地使用了以下代码:

BitmapImage bmi = new BitmapImage();
bmi.CreateOptions = BitmapCreateOptions.None;
StreamResourceInfo streamInfo = 
     Framework.App.GetResourceStream(new Uri(@"images'img.png", 
          UriKind.Relative));
bmi.SetSource(streamInfo.Stream);
imgctl.Source = bmi;

然而，我仍然试图让它工作时，从Xaml这样加载:

<Image  HorizontalAlignment="Center" Width="173" Height="89" x:Name="imgctl" 
    Source="/images/lowsunrise.png"/>

在这种情况下，图像永远不会被加载，也不会触发任何事件，可能是因为它没有连接到可视树，因此不会被渲染。

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