Can I update a live tile in Mango using local data?

问题

I have a Mango WP7.5 app that uses a local SqlCe database. I would like to add a LiveTile update that shows info taken from the local DB based on current day and month.

All the samples that I've found update the background by downloading remote images from servers but I would simply need to make a local database query and show a string in my tile.

Can I do it? How?

回答1:

Yes, you can. You have to

generate an image containing your textual information
save this image to isolated storage and
access it via isostore URI.

Here is code showing how to do this (it updates the Application Tile):

// set properties of the Application Tile
private void button1_Click(object sender, RoutedEventArgs e)
{
    // Application Tile is always the first Tile, even if it is not pinned to Start
    ShellTile TileToFind = ShellTile.ActiveTiles.First();

    // Application Tile should always be found
    if (TileToFind != null)
    {
        // create bitmap to write text to
        WriteableBitmap wbmp = new WriteableBitmap(173, 173);
        TextBlock text = new TextBlock() { FontSize = (double)Resources["PhoneFontSizeExtraLarge"], Foreground = new SolidColorBrush(Colors.White) };
        // your text from database goes here:
        text.Text = "Hello\nWorld";
        wbmp.Render(text, new TranslateTransform() { Y = 20 });
        wbmp.Invalidate();

        // save image to isolated storage
        using (IsolatedStorageFile isf = IsolatedStorageFile.GetUserStoreForApplication())
        {
            // use of "/Shared/ShellContent/" folder is mandatory!
            using (IsolatedStorageFileStream imageStream = new IsolatedStorageFileStream("/Shared/ShellContent/MyImage.jpg", System.IO.FileMode.Create, isf))
            {
                wbmp.SaveJpeg(imageStream, wbmp.PixelWidth, wbmp.PixelHeight, 0, 100);
            }
        }

        StandardTileData NewTileData = new StandardTileData
        {
            Title = "Title",
            // reference saved image via isostore URI
            BackgroundImage = new Uri("isostore:/Shared/ShellContent/MyImage.jpg", UriKind.Absolute),
        };

        // update the Application Tile
        TileToFind.Update(NewTileData);
    }
}

来源：https://stackoverflow.com/questions/8027812/can-i-update-a-live-tile-in-mango-using-local-data

标签

windows-phone-7

live-tile