private void sendImageRequest(boolean allowCachedResponse) {
try {
ImageRequest.Builder requestBuilder =
new ImageRequest.Builder(
getContext(), ImageRequest.getProfilePictureUri(profileId, queryWidth, queryHeight));
ImageRequest request =
requestBuilder
.setAllowCachedRedirects(allowCachedResponse)
.setCallerTag(this)
.setCallback(
new ImageRequest.Callback() {
@Override
public void onCompleted(ImageResponse response) {
processResponse(response);
}
})
.build();
// Make sure to cancel the old request before sending the new one to prevent
// accidental cancellation of the new request. This could happen if the URL and
// caller tag stayed the same.
if (lastRequest != null) {
ImageDownloader.cancelRequest(lastRequest);
}
lastRequest = request;
ImageDownloader.downloadAsync(request);
} catch (Exception e) {
Logger.log(LoggingBehavior.REQUESTS, Log.ERROR, TAG, e.toString());
}
}
public void prioritizeViewRange(int firstVisibleItem, int lastVisibleItem, int prefetchBuffer) {
if ((lastVisibleItem < firstVisibleItem) || (sectionKeys.size() == 0)) {
return;
}
// We want to prioritize requests for items which are visible but do not have pictures
// loaded yet. We also want to pre-fetch pictures for items which are not yet visible
// but are within a buffer on either side of the visible items, on the assumption that
// they will be visible soon. For these latter items, we'll store the images in memory
// in the hopes we can immediately populate their image view when needed.
// Prioritize the requests in reverse order since each call to prioritizeRequest will just
// move it to the front of the queue. And we want the earliest ones in the range to be at
// the front of the queue, so all else being equal, the list will appear to populate from
// the top down.
for (int i = lastVisibleItem; i >= 0; i--) {
SectionAndItem<T> sectionAndItem = getSectionAndItem(i);
if (sectionAndItem.graphObject != null) {
String id = getIdOfGraphObject(sectionAndItem.graphObject);
ImageRequest request = pendingRequests.get(id);
if (request != null) {
ImageDownloader.prioritizeRequest(request);
}
}
}
// For items which are not visible, but within the buffer on either side, we want to
// fetch those items and store them in a small in-memory cache of bitmaps.
int start = Math.max(0, firstVisibleItem - prefetchBuffer);
int end = Math.min(lastVisibleItem + prefetchBuffer, getCount() - 1);
ArrayList<T> graphObjectsToPrefetchPicturesFor = new ArrayList<T>();
// Add the IDs before and after the visible range.
for (int i = start; i < firstVisibleItem; ++i) {
SectionAndItem<T> sectionAndItem = getSectionAndItem(i);
if (sectionAndItem.graphObject != null) {
graphObjectsToPrefetchPicturesFor.add(sectionAndItem.graphObject);
}
}
for (int i = lastVisibleItem + 1; i <= end; ++i) {
SectionAndItem<T> sectionAndItem = getSectionAndItem(i);
if (sectionAndItem.graphObject != null) {
graphObjectsToPrefetchPicturesFor.add(sectionAndItem.graphObject);
}
}
for (T graphObject : graphObjectsToPrefetchPicturesFor) {
URI uri = getPictureUriOfGraphObject(graphObject);
final String id = getIdOfGraphObject(graphObject);
// This URL already have been requested for pre-fetching, but we want to act in an LRU manner,
// so move
// it to the end of the list regardless.
boolean alreadyPrefetching = prefetchedProfilePictureIds.remove(id);
prefetchedProfilePictureIds.add(id);
// If we've already requested it for pre-fetching, no need to do so again.
if (!alreadyPrefetching) {
downloadProfilePicture(id, uri, null);
}
}
}
private void updateUI() {
if (!isAdded()) {
return;
}
if (isSessionOpen()) {
connectedStateLabel.setTextColor(
getResources().getColor(R.color.com_facebook_usersettingsfragment_connected_text_color));
connectedStateLabel.setShadowLayer(
1f,
0f,
-1f,
getResources()
.getColor(R.color.com_facebook_usersettingsfragment_connected_shadow_color));
if (user != null) {
ImageRequest request = getImageRequest();
if (request != null) {
URI requestUrl = request.getImageUri();
// Do we already have the right picture? If so, leave it alone.
if (!requestUrl.equals(connectedStateLabel.getTag())) {
if (user.getId().equals(userProfilePicID)) {
connectedStateLabel.setCompoundDrawables(null, userProfilePic, null, null);
connectedStateLabel.setTag(requestUrl);
} else {
ImageDownloader.downloadAsync(request);
}
}
}
connectedStateLabel.setText(user.getName());
} else {
connectedStateLabel.setText(
getResources().getString(R.string.com_facebook_usersettingsfragment_logged_in));
Drawable noProfilePic =
getResources().getDrawable(R.drawable.com_facebook_profile_default_icon);
noProfilePic.setBounds(
0,
0,
getResources()
.getDimensionPixelSize(
R.dimen.com_facebook_usersettingsfragment_profile_picture_width),
getResources()
.getDimensionPixelSize(
R.dimen.com_facebook_usersettingsfragment_profile_picture_height));
connectedStateLabel.setCompoundDrawables(null, noProfilePic, null, null);
}
} else {
int textColor =
getResources()
.getColor(R.color.com_facebook_usersettingsfragment_not_connected_text_color);
connectedStateLabel.setTextColor(textColor);
connectedStateLabel.setShadowLayer(0f, 0f, 0f, textColor);
connectedStateLabel.setText(
getResources().getString(R.string.com_facebook_usersettingsfragment_not_logged_in));
connectedStateLabel.setCompoundDrawables(null, null, null, null);
connectedStateLabel.setTag(null);
}
}
private void downloadProfilePicture(
final String profileId, URI pictureURI, final ImageView imageView) {
if (pictureURI == null) {
return;
}
// If we don't have an imageView, we are pre-fetching this image to store in-memory because we
// think the user might scroll to its corresponding list row. If we do have an imageView, we
// only want to queue a download if the view's tag isn't already set to the URL (which would
// mean
// it's already got the correct picture).
boolean prefetching = imageView == null;
if (prefetching || !pictureURI.equals(imageView.getTag())) {
if (!prefetching) {
// Setting the tag to the profile ID indicates that we're currently downloading the
// picture for this profile; we'll set it to the actual picture URL when complete.
imageView.setTag(profileId);
imageView.setImageResource(getDefaultPicture());
}
ImageRequest.Builder builder =
new ImageRequest.Builder(context.getApplicationContext(), pictureURI)
.setCallerTag(this)
.setCallback(
new ImageRequest.Callback() {
@Override
public void onCompleted(ImageResponse response) {
processImageResponse(response, profileId, imageView);
}
});
ImageRequest newRequest = builder.build();
pendingRequests.put(profileId, newRequest);
ImageDownloader.downloadAsync(newRequest);
}
}