void Run()
{
Process.SetThreadPriority(ThreadPriority.Background);
if (_context._adapter == null)
{
_context.SendMessage(ConstantsCustomGallery.FETCH_STARTED);
}
File file;
var selectedImages = new List <long>();
if (_context._images != null)
{
for (int i = 0, l = _context._images.Count; i < l; i++)
{
var image = _context._images[i];
file = new File(image.Path);
if (file.Exists() && image.IsSelected)
{
selectedImages.Add(image.Id);
}
}
}
var cursor = _context.Application.ApplicationContext.ContentResolver.Query(
MediaStore.Images.Media.ExternalContentUri, _context._projection,
MediaStore.Images.Media.InterfaceConsts.BucketDisplayName + " =?", new string[] { _context._album },
MediaStore.Images.Media.InterfaceConsts.DateAdded);
if (cursor == null)
{
_context.SendMessage(ConstantsCustomGallery.ERROR);
return;
}
/*
* In case this runnable is executed to onChange calling loadImages,
* using countSelected variable can result in a race condition. To avoid that,
* tempCountSelected keeps track of number of selected images. On handling
* FETCH_COMPLETED message, countSelected is assigned value of tempCountSelected.
*/
int tempCountSelected = 0;
var temp = new List <Image>(cursor.Count);
if (cursor.MoveToLast())
{
do
{
if (Thread.Interrupted())
{
return;
}
var id = cursor.GetLong(cursor.GetColumnIndex(_context._projection[0]));
var name = cursor.GetString(cursor.GetColumnIndex(_context._projection[1]));
var path = cursor.GetString(cursor.GetColumnIndex(_context._projection[2]));
var isSelected = selectedImages.Contains(id);
if (isSelected)
{
tempCountSelected++;
}
file = null;
try
{
file = new File(path);
}
catch (Exception e)
{
Log.Debug("Exception : ", e.ToString());
}
if (file.Exists())
{
temp.Add(new Image(id, name, path, isSelected));
}
} while (cursor.MoveToPrevious());
}
cursor.Close();
if (_context._images == null)
{
_context._images = new List <Image>();
}
_context._images.Clear();
_context._images.AddRange(temp);
_context.SendMessage(ConstantsCustomGallery.FETCH_COMPLETED, tempCountSelected);
}
