android/guava/src/com/google/common/collect/Maps.java
public static <K, V> SortedMap<K, V> filterValues(
      SortedMap<K, V> unfiltered, final Predicate<? super V> valuePredicate) {
    return filterEntries(unfiltered, Maps.<V>valuePredicateOnEntries(valuePredicate));
  }
public static <K, V> SortedMap<K, V> filterValues(
      SortedMap<K, V> unfiltered, final Predicate<? super V> valuePredicate) {
    return filterEntries(unfiltered, Maps.<V>valuePredicateOnEntries(valuePredicate));
  }
Returns a sorted map containing the mappings in {@code unfiltered} whose values satisfy a
predicate. The returned map is a live view of {@code unfiltered}; changes to one affect the
other.

<p>The resulting map's {@code keySet()}, {@code entrySet()}, and {@code values()} views have
iterators that don't support {@code remove()}, but all other methods are supported by the map
and its views. When given a value that doesn't satisfy the predicate, the map's {@code put()},
{@code putAll()}, and {@link Entry#setValue} methods throw an {@link IllegalArgumentException}.

<p>When methods such as {@code removeAll()} and {@code clear()} are called on the filtered map
or its views, only mappings whose values satisfy the filter will be removed from the underlying
map.

<p>The returned map isn't threadsafe or serializable, even if {@code unfiltered} is.

<p>Many of the filtered map's methods, such as {@code size()}, iterate across every key/value
mapping in the underlying map and determine which satisfy the filter. When a live view is
<i>not</i> needed, it may be faster to copy the filtered map and use the copy.

<p><b>Warning:</b> {@code valuePredicate} must be <i>consistent with equals</i>, as documented
at {@link Predicate#apply}. Do not provide a predicate such as {@code
Predicates.instanceOf(ArrayList.class)}, which is inconsistent with equals.

@since 11.0