protected override void OnPostExecute(Java.Lang.Object result)
{
Bitmap bitmap = result as Bitmap;
if (IsCancelled)
{
bitmap = null;
}
if (viewHolderReference != null && bitmap != null)
{
ImageView holder = null;
bool res = false;
res = viewHolderReference.TryGetTarget(out holder);
if (res && holder != null)
{
BitmapWorkerTask bitmapWorkerTask = GetBitmapWorkerTask(holder);
if (this == bitmapWorkerTask && holder != null)
{
holder.SetImageBitmap(bitmap);
}
}
}
}
private void loadBitmaps(int firstVisibleItem, int visibleItemCount)
{
try
{
for (int i = firstVisibleItem; i < firstVisibleItem + visibleItemCount; i++)
{
String imageUrl = Images.imageThumbUrls[i];
var bitmap = GetBitmapFromMemoryCache(imageUrl);
if (bitmap == null)
{
BitmapWorkerTask task = new BitmapWorkerTask();
taskCollection.Add(task);
task.Execute(imageUrl);
}
else
{
ImageView imageView = (ImageView)mPhotoWall.FindViewWithTag(imageUrl);
if (imageView != null && bitmap != null)
{
imageView.SetImageBitmap(bitmap);
}
}
}
}
catch (Exception e)
{
}
}
/// <summary>
/// Loads a non-scaled bitmap from the Assets folder on a background thread into an ImageView.
/// </summary>
/// <param name="maxPoolSize">The maximum limit of images to pool.</param>
/// <param name="imageView">The ImageView for the bitmap to load into.</param>
/// <param name="context">A context to get an AssetManager instance.</param>
/// <param name="fileName">The image file path.</param>
/// <param name="assetImageDir">The parent directory for <paramref name="fileName"/> path parameter.</param>
public void LoadBitmapInImageViewAsync(int maxPoolSize, ImageView imageView, Context context, string fileName,
string assetImageDir = null)
{
BitmapWorkerTask task = new BitmapWorkerTask(this, imageView);
task.Execute(maxPoolSize, context, fileName, assetImageDir);
}
public void DrawPageImageView(ImageView holder, int position)
{
if (CancelPotentialWork(holder, position))
{
BitmapWorkerTask task = new BitmapWorkerTask(holder, position, this);
AsyncDrawable asyncDrawable = new AsyncDrawable(mContext.Resources, mLoadingBitmap, task);
holder.SetImageDrawable(asyncDrawable);
task.Execute();
}
}
public BitmapWorkerTask GetBitmapWorkerTask()
{
BitmapWorkerTask holder = null;
bool result;
result = bitmapWorkerTaskReference.TryGetTarget(out holder);
if (result)
{
return(holder);
}
else
{
return(null);
}
}
public static bool CancelPotentialWork(ImageView holder, int position)
{
BitmapWorkerTask bitmapWorkerTask = GetBitmapWorkerTask(holder);
if (bitmapWorkerTask != null)
{
int bitmapPosition = bitmapWorkerTask.position;
if (bitmapPosition != position)
{
// Cancel previous task
bitmapWorkerTask.Cancel(true);
}
else
{
// The same work is already in progress
return(false);
}
}
// No task associated with the ImageView, or an existing task was
// cancelled
return(true);
}
// 別インスタンスから復旧
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
//リクエストコードの判定（カメラ・フォトギャラリーかどうか）
if (requestCode == 1)
{
if (resultCode == Result.Ok)
{
if (data.Data != null)
{
//画像のパスを取得
Android.Net.Uri uri = data.Data;
//画像のメタデータをもとに画像の向きを確定する
int orientation = getOrientation(uri);
//バックグラウンドでbitmapの準備をする
BitmapWorkerTask task = new BitmapWorkerTask(this.ContentResolver, uri);
task.Execute(orientation);
}
}
}
}
public AsyncDrawable(Android.Content.Res.Resources res, Bitmap bitmap, BitmapWorkerTask bitmapWorkerTask) : base(res, bitmap)
{
bitmapWorkerTaskReference = new WeakReference <BitmapWorkerTask>(bitmapWorkerTask);
}
public static void FromUrlNonConcurency(this ImageView imageView, string url, Resources resources)
{
BitmapWorkerTask.StartNew(imageView, url, resources);
}
