public void attach(GraphObjectAdapter<T> adapter) {
loader =
(GraphObjectPagingLoader<T>)
getLoaderManager()
.initLoader(
0,
null,
new LoaderManager.LoaderCallbacks<SimpleGraphObjectCursor<T>>() {
@Override
public Loader<SimpleGraphObjectCursor<T>> onCreateLoader(
int id, Bundle args) {
return LoadingStrategy.this.onCreateLoader();
}
@Override
public void onLoadFinished(
Loader<SimpleGraphObjectCursor<T>> loader,
SimpleGraphObjectCursor<T> data) {
if (loader != LoadingStrategy.this.loader) {
throw new FacebookException("Received callback for unknown loader.");
}
LoadingStrategy.this.onLoadFinished(
(GraphObjectPagingLoader<T>) loader, data);
}
@Override
public void onLoaderReset(Loader<SimpleGraphObjectCursor<T>> loader) {
if (loader != LoadingStrategy.this.loader) {
throw new FacebookException("Received callback for unknown loader.");
}
LoadingStrategy.this.onLoadReset((GraphObjectPagingLoader<T>) loader);
}
});
loader.setOnErrorListener(
new GraphObjectPagingLoader.OnErrorListener() {
@Override
public void onError(FacebookException error, GraphObjectPagingLoader<?> loader) {
hideActivityCircle();
if (onErrorListener != null) {
onErrorListener.onError(PickerFragment.this, error);
}
}
});
this.adapter = adapter;
// Tell the adapter about any data we might already have.
this.adapter.changeCursor(loader.getCursor());
this.adapter.setOnErrorListener(
new GraphObjectAdapter.OnErrorListener() {
@Override
public void onError(GraphObjectAdapter<?> adapter, FacebookException error) {
if (onErrorListener != null) {
onErrorListener.onError(PickerFragment.this, error);
}
}
});
}
public void detach() {
adapter.setDataNeededListener(null);
adapter.setOnErrorListener(null);
loader.setOnErrorListener(null);
loader = null;
adapter = null;
}
@Override
protected void onLoadFinished(
GraphObjectPagingLoader<GraphPlace> loader, SimpleGraphObjectCursor<GraphPlace> data) {
super.onLoadFinished(loader, data);
// We could be called in this state if we are clearing data or if we are being re-attached
// in the middle of a query.
if (data == null || loader.isLoading()) {
return;
}
hideActivityCircle();
if (data.isFromCache()) {
// Only the first page can be cached, since all subsequent pages will be round-tripped.
// Force
// a refresh of the first page before we allow paging to begin. If the first page produced
// no data, launch the refresh immediately, otherwise schedule it for later.
loader.refreshOriginalRequest(
data.areMoreObjectsAvailable() ? CACHED_RESULT_REFRESH_DELAY : 0);
}
}
public boolean isDataPresentOrLoading() {
return !adapter.isEmpty() || loader.isLoading();
}
public void startLoading(Request request) {
if (loader != null) {
loader.startLoading(request, canSkipRoundTripIfCached());
onStartLoading(loader, request);
}
}
public void clearResults() {
if (loader != null) {
loader.clearResults();
}
}