com.avos.avoscloud

Class GetCallback<T extends AVObject>

java.lang.Object

com.avos.avoscloud.AVCallback<T>

com.avos.avoscloud.GetCallback<T>

public abstract class GetCallback<T extends AVObject>
extends AVCallback<T>

A GetCallback is used to run code after a AVQuery is used to fetch a AVObject in a background thread.

The easiest way to use a GetCallback is through an anonymous inner class. Override the done function to specify what the callback should do after the fetch is complete. The done function will be run in the UI thread, while the fetch happens in a background thread. This ensures that the UI does not freeze while the fetch happens.

For example, this sample code fetches an object of class "MyClass" and id myId. It calls a different function depending on whether the fetch succeeded or not.

 AVQuery<AVObject> query = AVQuery.getQuery("MyClass");
 query.getInBackground(myId, new GetCallback<AVObject>() {
   public void done(AVObject object, AVException e) {
     if (e == null) {
       objectWasRetrievedSuccessfully(object);
     } else {
       objectRetrievalFailed();
     }
   }
 });
 

Constructor Summary

Constructors

Constructor and Description
GetCallback()

Method Summary

Modifier and Type	Method and Description
abstract void	done(T object, AVException e) Override this function with the code you want to run after the fetch is complete.
protected void	internalDone0(T returnValue, AVException e)

Methods inherited from class com.avos.avoscloud.AVCallback

internalDone, internalDone, mustRunOnUIThread

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

GetCallback

public GetCallback()

Method Detail

done

public abstract void done(T object,
                          AVException e)

Override this function with the code you want to run after the fetch is complete.

Parameters:

object - The object that was retrieved, or null if it did not succeed.

e - The exception raised by the save, or null if it succeeded.

internalDone0

protected final void internalDone0(T returnValue,
                                   AVException e)

Specified by:

internalDone0 in class AVCallback<T extends AVObject>