//响应请求
private void BatchResponse(String cacheKey, BatchedImageRequest request)
{
mBatchedResponses.Add(cacheKey, request);
if (mRunnable == null)
{
mRunnable = () =>
{
foreach (BatchedImageRequest bir in mBatchedResponses.Values)
{
foreach (ImageContainer container in bir.Containers)
{
if (container.OnSuccessResponse == null)
{
continue;
}
if (bir.Error == null)
{
container.Bitmap = bir.ResponseBitmap;
container.OnSuccessResponse(container, false);
}
else
{
if (container.OnErrorResponse != null)
{
container.OnErrorResponse(bir.Error);
}
}
}
}
mBatchedResponses.Clear();
mRunnable = null;
};
}
mHandler.PostDelayed(mRunnable, mBatchResponseDelayMs);
}
public void CancelRequest()
{
if (OnSuccessResponse == null)
{
return;
}
BatchedImageRequest request = null;
mInFlightRequests.TryGetValue(mCacheKey, out request);
if (request != null)
{
bool canceled = request.RemoveContainerAndCancelIfNecessary(this);
if (canceled)
{
mInFlightRequests.Remove(mCacheKey);
}
}
else
{
mBatchedResponses.TryGetValue(mCacheKey, out request);
if (request != null)
{
request.RemoveContainerAndCancelIfNecessary(this);
if (request.Containers.Count == 0)
{
mBatchedResponses.Remove(mCacheKey);
}
}
}
}
protected void OnGetImageError(String cacheKey, VolleyError error)
{
BatchedImageRequest request = null;
mInFlightRequests.TryGetValue(cacheKey, out request);
mInFlightRequests.Remove(cacheKey);
if (request != null)
{
request.Error = error;
BatchResponse(cacheKey, request);
}
}
protected void OnGetImageSuccess(String cacheKey, Bitmap response)
{
//将成功的请求放入缓存
mCache.PutBitmap(cacheKey, response);
BatchedImageRequest request = null;
mInFlightRequests.TryGetValue(cacheKey, out request);
mInFlightRequests.Remove(cacheKey);
if (request != null)
{
request.ResponseBitmap = response;
BatchResponse(cacheKey, request);
}
}
public ImageContainer Get(String requestUrl, int maxWidth, int maxHeight, Android.Widget.ImageView.ScaleType scaleType,
Action <ImageContainer, bool> successResponse, Action <VolleyError> errorResponse)
{
ThrowIfNotOnMainThread();
if (successResponse == null)
{
throw new ArgumentNullException("successResponse不能为null，必须提供请求成功的委托。");
}
String cacheKey = GetCacheKey(requestUrl, maxWidth, maxHeight, scaleType);
//缓存命中直接响应请求
Bitmap cachedBitmap = mCache.GetBitmap(cacheKey);
if (cachedBitmap != null)
{
ImageContainer container = new ImageContainer(cachedBitmap, requestUrl, null, mInFlightRequests,
mBatchedResponses);
successResponse(container, true);
return(container);
}
//缓存未命中添加到请求中
ImageContainer imageContainer = new ImageContainer(null, requestUrl, cacheKey, mInFlightRequests,
mBatchedResponses);
imageContainer.ErrorResponse += errorResponse;
imageContainer.SuccessResponse += successResponse;
successResponse(imageContainer, true);
//是否存在相同的请求，存在则添加该请求，否则创建
BatchedImageRequest request = null;
mInFlightRequests.TryGetValue(cacheKey, out request);
if (request != null)
{
request.AddContainer(imageContainer);
return(imageContainer);
}
Request newRequest = MakeImageRequest(requestUrl, maxWidth, maxHeight, scaleType, cacheKey);
mRequestQueue.Add(newRequest);
mInFlightRequests.Add(cacheKey, new BatchedImageRequest(newRequest, imageContainer));
return(imageContainer);
}
//��Ӧ����
private void BatchResponse(String cacheKey, BatchedImageRequest request)
{
mBatchedResponses.Add(cacheKey, request);
if (mRunnable == null)
{
mRunnable = () =>
{
foreach (BatchedImageRequest bir in mBatchedResponses.Values)
{
foreach (ImageContainer container in bir.Containers)
{
if (container.OnSuccessResponse == null)
{
continue;
}
if (bir.Error == null)
{
container.Bitmap = bir.ResponseBitmap;
container.OnSuccessResponse(container, false);
}
else
{
if (container.OnErrorResponse != null)
{
container.OnErrorResponse(bir.Error);
}
}
}
}
mBatchedResponses.Clear();
mRunnable = null;
};
}
mHandler.PostDelayed(mRunnable, mBatchResponseDelayMs);
}