// Returns the task if we started the task or the task is already started.
private Future<?> startTaskIfNeeded(int index, int which) {
if (index < mActiveStart || index >= mActiveEnd) return null;
ImageEntry entry = mImageCache.get(getVersion(index));
if (entry == null) return null;
if (which == BIT_SCREEN_NAIL && entry.screenNailTask != null) {
return entry.screenNailTask;
} else if (which == BIT_FULL_IMAGE && entry.fullImageTask != null) {
return entry.fullImageTask;
}
MediaItem item = mData[index % DATA_CACHE_SIZE];
Utils.assertTrue(item != null);
if (which == BIT_SCREEN_NAIL && (entry.requestedBits & BIT_SCREEN_NAIL) == 0) {
entry.requestedBits |= BIT_SCREEN_NAIL;
entry.screenNailTask =
mThreadPool.submit(
new ScreenNailJob(item), new ScreenNailListener(item.getDataVersion()));
// request screen nail
return entry.screenNailTask;
}
if (which == BIT_FULL_IMAGE
&& (entry.requestedBits & BIT_FULL_IMAGE) == 0
&& (item.getSupportedOperations() & MediaItem.SUPPORT_FULL_IMAGE) != 0) {
entry.requestedBits |= BIT_FULL_IMAGE;
entry.fullImageTask =
mThreadPool.submit(
item.requestLargeImage(), new FullImageListener(item.getDataVersion()));
// request full image
return entry.fullImageTask;
}
return null;
}
