@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
this.context = activity;
session = Session.getCurrentSession(context);
// Check the onPositionRequestedListener
try {
onPositionRequestedListener = (OnPositionRequestedListener) activity;
myActualPosition = onPositionRequestedListener.requestPosition();
updateRestaurants();
} catch (ClassCastException classCastException) {
Log.e(
LOG_TAG,
"The attached activity must implements the OnPositionRequestedListener",
classCastException);
}
// Check the onProgressBarShowRequestListener
try {
onProgressBarShowRequestListener = (OnProgressBarShowRequestListener) activity;
} catch (ClassCastException classCastException) {
Log.e(
LOG_TAG,
"The attached activity must implements the OnProgressBarShowRequestListener",
classCastException);
}
}
@Override
public void onScroll(
AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
boolean loadMoreRestaurants = firstVisibleItem + visibleItemCount >= totalItemCount;
boolean moreDataAvailable = (nextPageToken != null && !nextPageToken.equalsIgnoreCase(""));
if (loadMoreRestaurants && moreDataAvailable && !isLoadingMoreRestaurants) {
Log.v(
LOG_TAG,
"Load more restaurants request send and more restaurants are available. Loading.");
// Show the progress bar
onProgressBarShowRequestListener.showProgressBar();
isLoadingMoreRestaurants = true;
// The app is requesting for more data and there is more data available.
// Requesting them
Toast.makeText(context, R.string.loading_new_restaurants, Toast.LENGTH_LONG).show();
session.getRestaurantsNearbyNextPage(
nextPageToken,
new RequestRestaurantsCallback() {
@Override
public void done(
List<Restaurant> newRestaurants,
String newNextPageToken,
String errorMessage,
RequestStatus requestStatus) {
isLoadingMoreRestaurants = false;
// Disable the progress bar
onProgressBarShowRequestListener.hidePorgressBar();
if (!ErrorHandler.isError(requestStatus)) {
nextPageToken = newNextPageToken;
restaurantListAdapter.addMoreRestaurants(newRestaurants);
} else {
Toast.makeText(context, errorMessage, Toast.LENGTH_LONG).show();
// Remove the next page token saved
nextPageToken = null;
// If there is any error about Internet connection but the list of
// restaurants has been retrieved offLine, reset the list
if (requestStatus == RequestStatus.ERROR_REQUEST_NOK_HTTP_NO_CONNECTION
&& newRestaurants != null) {
showRestaurantList(newRestaurants);
}
}
}
});
}
}
/** Update the list of the restaurants based on the position of the user */
private void updateRestaurants() {
if (myActualPosition == null) {
Log.e(
LOG_TAG,
"Trying to update the list of the restaurants when the position of the user is unknown.");
return;
}
if (session == null) {
Log.w(LOG_TAG, "Trying to upate the list of the restaurants when the session is not ready");
return;
}
session.getRestaurantsNearby(
myActualPosition,
new RequestRestaurantsCallback() {
@Override
public void done(
List<Restaurant> restaurants,
String newNextPageToken,
String errorMessage,
RequestStatus requestStatus) {
if (!ErrorHandler.isError(requestStatus)) {
Log.v(LOG_TAG, "List of the restaurants returned correctly");
nextPageToken = newNextPageToken;
showRestaurantList(restaurants);
} else {
Toast.makeText(context, errorMessage, Toast.LENGTH_LONG).show();
// Remove the next page token saved
nextPageToken = null;
// If there is any error about Internet connection but the list of
// restaurants has been retrieved offline, draw them on the map
if (requestStatus == RequestStatus.ERROR_REQUEST_NOK_HTTP_NO_CONNECTION
&& restaurants != null) {
showRestaurantList(restaurants);
}
}
}
});
}