How to use

getFirstInBackground

method

in

com.avos.avoscloud.AVQuery

/**
 * Retrieves at most one AVObject that satisfies this query from the server in a background
 * thread. This is preferable to using getFirst(), unless your code is already running in a
 * background thread. This mutates the AVQuery.
 *
 * @param callback callback.done(object, e) is called when the find completes.
 */
public void getFirstInBackground(GetCallback<T> callback) {
 getFirstInBackground(false, callback);
}

/**
 * Retrieves at most one AVObject that satisfies this query from the server in a background
 * thread. This is preferable to using getFirst(), unless your code is already running in a
 * background thread. This mutates the AVQuery.
 *
 * @param callback callback.done(object, e) is called when the find completes.
 */
public void getFirstInBackground(GetCallback<T> callback) {
 getFirstInBackground(false, callback);
}

/**
 * Retrieves at most one AVObject that satisfies this query. Uses the network and/or the cache,
 * depending on the cache policy. This mutates the AVQuery.
 *
 * @return A AVObject obeying the conditions set in this query, or null if none found.
 */
@SuppressWarnings("unchecked")
public T getFirst() throws AVException {
 final Object[] result = {null};
 getFirstInBackground(true, new GetCallback<T>() {
  @Override
  public void done(AVObject object, AVException e) {
   if (e == null) {
    result[0] = object;
   } else {
    AVExceptionHolder.add(e);
   }
  }
  @Override
  protected boolean mustRunOnUIThread() {
   return false;
  }
 });
 if (AVExceptionHolder.exists()) {
  throw AVExceptionHolder.remove();
 }
 return (T) result[0];
}

/**
 * Retrieves at most one AVObject that satisfies this query. Uses the network and/or the cache,
 * depending on the cache policy. This mutates the AVQuery.
 *
 * @return A AVObject obeying the conditions set in this query, or null if none found.
 */
@SuppressWarnings("unchecked")
public T getFirst() throws AVException {
 final Object[] result = {null};
 getFirstInBackground(true, new GetCallback<T>() {
  @Override
  public void done(AVObject object, AVException e) {
   if (e == null) {
    result[0] = object;
   } else {
    AVExceptionHolder.add(e);
   }
  }
  @Override
  protected boolean mustRunOnUIThread() {
   return false;
  }
 });
 if (AVExceptionHolder.exists()) {
  throw AVExceptionHolder.remove();
 }
 return (T) result[0];
}