public async static Task <BitmapImage> LoadBitmapAsync(string uri)
{
if (uri == null)
{
return(null);
}
Stream memStream = null;
BitmapImage bitmap = null;
if (uri.StartsWith("data:image"))
{
string ex;
memStream = new MemoryStream(ImageUtility.DecodeImageFromDataUri(uri, out ex));
}
else if (uri.StartsWith("http") || uri.StartsWith("ftp"))
{
memStream = new MemoryStream();
var httPeter = new HttpClient();
try
{
var stream = await httPeter.GetStreamAsync(uri);
await stream.CopyToAsync(memStream);
}
catch (Exception e)
{
iApp.Log.Info(e);
memStream = null;
}
}
else
{
byte[] bytes = iApp.File.Read(uri, EncryptionMode.NoEncryption);
if (bytes == null)
{
iApp.Log.Info("Not found: " + uri);
}
else
{
memStream = new MemoryStream(bytes);
}
}
if (memStream != null)
{
memStream.Position = 0;
bitmap = new BitmapImage();
bitmap.SetSource(memStream);
}
return(bitmap);
}
public BitmapImage(string uri)
{
string ext = string.Empty;
byte[] bytes = null;
if (uri.StartsWith("http") || uri.StartsWith("ftp"))
{
try
{
bytes = Device.Network.GetBytes(uri);
}
catch (Exception ex)
{
Device.Log.Error("Image download failed", ex);
}
}
else if (uri.StartsWith("data:"))
{
bytes = ImageUtility.DecodeImageFromDataUri(uri, out ext);
}
else
{
try { bytes = Device.File.Read(uri); }
catch (Exception e)
{
bytes = null;
Device.Log.Warn("Exception reading file from :" + uri, e);
}
}
if (string.IsNullOrEmpty(ext) && uri.ToLower().EndsWith("png"))
{
ext = "png";
}
if (bytes == null)
{
return;
}
_buffer = bytes;
Format = ext.ToLower() == "png" ? ImageFileFormat.PNG : ImageFileFormat.JPEG;
}
public static void SetDrawable(string url, Action <Drawable, string> callback, ImageCreationOptions options = ImageCreationOptions.None, TimeSpan cacheDuration = default(TimeSpan))
{
if (callback == null)
{
return;
}
if (string.IsNullOrEmpty(url))
{
callback.Invoke(null, url);
return;
}
#region Check memory cache
var skipCache = (options & ImageCreationOptions.IgnoreCache) == ImageCreationOptions.IgnoreCache;
var cached = skipCache ? null : Device.ImageCache.Get(url);
if (cached is ImageData droidImage)
{
callback.Invoke(new BitmapDrawable(Resources, droidImage.Bitmap), url);
return;
}
#endregion
if (cacheDuration == default(TimeSpan))
{
cacheDuration = Timeout.InfiniteTimeSpan;
}
//Check to see if another view is already waiting for this url so we don't download it again
var currentDownload = PendingDownloads.GetValueOrDefault(url);
if (currentDownload != null)
{
currentDownload.Add(callback);
return;
}
else
{
PendingDownloads[url] = new List <Action <Drawable, string> > {
callback
};
}
Device.Thread.Start(() =>
{
var storage = (AndroidFile)Device.File;
var cacheFile = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.Personal),
url.GetHashCode().ToString(CultureInfo.InvariantCulture).Replace("-", "N") + ".urlimage");
Bitmap bitmap = null;
Stream assetStream;
Drawable drawable = null;
var resourceId = 0;
if (url.StartsWith("data:"))
{
// Load data URIs like files
if (!storage.Exists(cacheFile))
{
storage.Save(cacheFile, ImageUtility.DecodeImageFromDataUri(url, out string ext));
}
}
else if ((resourceId = storage.ResourceFromFileName(url)) > 0)
{
drawable = Resources.GetDrawable(resourceId);
}
else if ((assetStream = storage.GetAsset(url)) != null)
{
bitmap = BitmapFactory.DecodeStream(assetStream);
}
else if (cached != null)
{
var bytes = cached.GetBytes();
if (bytes != null && bytes.Length > 0)
{
bitmap = BitmapFactory.DecodeByteArray(bytes, 0, bytes.Length, new BitmapFactory.Options
{
InDensity = (int)DisplayMetricsDensity.Default,
InTargetDensity = (int)((int)DisplayMetricsDensity.Default * DroidFactory.DisplayScale),
});
}
}
else if (!storage.Exists(url) && (!storage.Exists(cacheFile) || new FileInfo(cacheFile).LastWriteTimeUtc > DateTime.UtcNow - cacheDuration))
{
try
{
var uri = Java.Net.URI.Create(url);
var bytes = string.IsNullOrEmpty(uri.Scheme) ? null : Device.Network.GetBytes(url);
if (bytes != null && bytes.Length > 0)
{
storage.Save(cacheFile, bytes);
}
}
catch (Exception ex)
{
Device.Log.Error("Image download failed", ex);
}
}
else
{
bitmap = LoadFromStorage(url, 0, 0);
}
if (storage.Exists(cacheFile))
{
bitmap = LoadFromStorage(cacheFile, 0, 0);
}
if (!skipCache && bitmap != null)
{
Device.ImageCache.Add(url, new ImageData(bitmap, url));
}
var downloads = PendingDownloads[url];
PendingDownloads.Remove(url);
if (drawable == null && bitmap != null)
{
drawable = new BitmapDrawable(Resources, bitmap);
}
foreach (var iv in downloads)
{
Device.Thread.ExecuteOnMainThread(() =>
{
iv.Invoke(drawable, url);
});
}
});
}
public async static Task <BitmapImage> LoadBitmapAsync(string uri)
{
if (string.IsNullOrWhiteSpace(uri))
{
return(null);
}
Stream memStream = null;
if (uri.StartsWith("data:image"))
{
string ex;
var data = ImageUtility.DecodeImageFromDataUri(uri, out ex);
if (data != null)
{
memStream = new MemoryStream(data);
}
}
else if (uri.StartsWith("http") || uri.StartsWith("ftp"))
{
memStream = new MemoryStream();
var httPeter = new HttpClient();
try
{
var stream = await httPeter.GetStreamAsync(uri);
await stream.CopyToAsync(memStream);
}
catch (Exception e)
{
iApp.Log.Error("Image load failed: " + uri, e);
memStream = null;
}
}
else
{
byte[] bytes = iApp.File.Read(uri, EncryptionMode.NoEncryption);
if (bytes == null)
{
iApp.Log.Info("Image load failed: " + uri);
}
else
{
memStream = new MemoryStream(bytes);
}
}
if (memStream == null)
{
return(null);
}
var bitmap = new BitmapImage();
bitmap.BeginInit();
bitmap.CacheOption = BitmapCacheOption.None;
memStream.Position = 0;
bitmap.StreamSource = memStream;
try
{
bitmap.EndInit();
//bitmap.Freeze();
}
catch (Exception e)
{
iApp.Log.Error(e);
bitmap = null;
}
return(bitmap);
}
