How to use

getAvailableZoneIds

method

in

org.threeten.bp.zone.ZoneRulesProvider

 @Test public void litmus() {
  AndroidThreeTen.init(context);
  assertThat(ZoneRulesProvider.getAvailableZoneIds()).isNotEmpty();
 }
}

/**
 * Gets the set of available zone IDs.
 * <p>
 * This set includes the string form of all available region-based IDs.
 * Offset-based zone IDs are not included in the returned set.
 * The ID can be passed to {@link #of(String)} to create a {@code ZoneId}.
 * <p>
 * The set of zone IDs can increase over time, although in a typical application
 * the set of IDs is fixed. Each call to this method is thread-safe.
 *
 * @return a modifiable copy of the set of zone IDs, not null
 */
public static Set<String> getAvailableZoneIds() {
  return new HashSet<String>(ZoneRulesProvider.getAvailableZoneIds());
}

/**
 * Gets the set of available zone IDs.
 * <p>
 * This set includes the string form of all available region-based IDs.
 * Offset-based zone IDs are not included in the returned set.
 * The ID can be passed to {@link #of(String)} to create a {@code ZoneId}.
 * <p>
 * The set of zone IDs can increase over time, although in a typical application
 * the set of IDs is fixed. Each call to this method is thread-safe.
 *
 * @return a modifiable copy of the set of zone IDs, not null
 */
public static Set<String> getAvailableZoneIds() {
  return new HashSet<String>(ZoneRulesProvider.getAvailableZoneIds());
}

/**
 * Call on background thread to eagerly load all zones. Starts with loading
 * {@link ZoneId#systemDefault()} which is the one most likely to be used.
 */
@WorkerThread
public static void cacheZones() {
  ZoneId.systemDefault().getRules();
  for (String zoneId : ZoneRulesProvider.getAvailableZoneIds()) {
    ZoneRulesProvider.getRules(zoneId, true);
  }
}

@Test
public void init() {
  LazyThreeTen.init(context);
  assertThat(ZoneRulesProvider.getAvailableZoneIds()).isNotEmpty();
}

Set<String> regionIds = ZoneRulesProvider.getAvailableZoneIds();
final int regionIdsSize = regionIds.size();
Entry<Integer, SubstringTree> cached = cachedSubstringTree;

Set<String> regionIds = ZoneRulesProvider.getAvailableZoneIds();
final int regionIdsSize = regionIds.size();
Entry<Integer, SubstringTree> cached = cachedSubstringTree;