What is LoadingCallback

reuben-khanna · April 27, 2016, 6:29pm

Hi i was watching this video of yours

cant figure out what is loadingcallback in it i get an error saying cannot resolve symbol

mark-piller · April 27, 2016, 8:44pm

Hello,

It is an implementation of AsyncCallback:

Backendless/RestaurantToGo/blob/master/order_placement/src/main/java/com/backendless/samples/restaurant/utility/LoadingCallback.java

package com.backendless.samples.restaurant.utility;

import android.app.ProgressDialog;
import android.content.Context;
import com.backendless.async.callback.AsyncCallback;
import com.backendless.exceptions.BackendlessFault;
import com.backendless.samples.restaurant.R;

/**
 * A callback, which has ability to show loading dialog while response is being received.
 * Shows Toast with result's toString() on success.
 * Shows AlertDialog with error message on failure.
 * If overriding handleResponse and/or handleFault, should manually dismiss ProgressDialog with hideLoading() method
 * or calling super.handleResponse() or super.handleFault().
 *
 * @param <T> class to be received from server
 */
public class LoadingCallback<T> implements AsyncCallback<T>
{
  private Context context;

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Regards,
Mark

reuben-khanna · May 1, 2016, 3:26am

Hey mark what if i dont want to load them in a list view what if i just want it to load the first coloumn and use settext to set the data on text how can i do it ?

mark-piller · May 1, 2016, 4:35pm

I’d be happy to assist you with our API, however, I cannot provide advice on UI programming.

reuben-khanna · May 1, 2016, 4:53pm

Okay let me ask this way see your example is for setting the data in a listview i want to know whether you have any examples for getting only one day that is Restaurant name not the whole table data

I am having a table which i am using to store image URL i want to retrieve just that URL not other data and this URL will be parsed to show image using picasso

I hope now i am clear to you

How can i get data from my table is my question ?

mark-piller · May 1, 2016, 4:55pm

You can use the REST API if you need to get only a specific property (or properties). See the “props” argument here:

https://backendless.com/documentation/data/rest/data_search_and_query.htm

Otherwise, if you use the SDK for Android, you get a complete object back.

reuben-khanna · May 1, 2016, 5:01pm

Ooh so using the android SDK i can only add data to list views but to get single data i need to use rest API get the JSON and parse it right

mark-piller · May 1, 2016, 5:07pm

Yes, this is correct. I still do not understand what’s wrong with retrieving a single object and then using only one property from it.

reuben-khanna · May 1, 2016, 5:23pm

Mark in the video you get a single object then you use this code

Restaurant item = getItem();
and then item.getname to get the name of restaurant right
so yo get the data in listVIew right

Now if i want to retrieve the object without using list view do you have any method for it in your API if so then retrieving single object is not a big deal for me

mark-piller · May 1, 2016, 5:26pm

our API knows nothing about list view (or any other UI component for that matter). What the API does is retrieves data from the backend. How you use the data is completely up to you.