shadows/framework/src/main/java/org/robolectric/shadows/ShadowContentResolver.java
public Collection<ContentObserver> getContentObservers(Uri uri) {
    ArrayList<ContentObserver> observers = new ArrayList<>(1);
    for (ContentObserverEntry entry : contentObservers) {
      if (entry.matches(uri)) {
        observers.add(entry.observer);
      }
    }
    return observers;
  }
public Collection<ContentObserver> getContentObservers(Uri uri) {
    ArrayList<ContentObserver> observers = new ArrayList<>(1);
    for (ContentObserverEntry entry : contentObservers) {
      if (entry.matches(uri)) {
        observers.add(entry.observer);
      }
    }
    return observers;
  }
Returns the content observers registered for updates under the given URI.

Will be empty if no observer is registered.

@param uri Given URI
@return The content observers, or null