| CallLogProvider | Call log content provider. |
| CommonNicknameCache | Cache for common nicknames. |
| ContactAggregator | ContactAggregator deals with aggregating contact information coming from different sources. |
| ContactLocaleUtils | This utility class provides customized sort key and name lookup key according the locale. |
| ContactLocaleUtils.ContactLocaleUtilsBase | This class is the default implementation. |
| ContactLookupKey | Contacts lookup key. |
| ContactLookupKey.LookupKeySegment | |
| ContactMatcher | Logic for matching contacts' data and accumulating match scores. |
| ContactMatcher.MatchScore | Captures the max score and match count for a specific contact. |
| ContactsProvider2 | Contacts content provider. |
| ContactsProvider2.CommonDataRowHandler | |
| ContactsProvider2.CustomDataRowHandler | |
| ContactsProvider2.EmailDataRowHandler | |
| ContactsProvider2.GroupIdCacheEntry | An entry in group id cache. |
| ContactsProvider2.GroupMembershipRowHandler | |
| ContactsProvider2.NicknameDataRowHandler | |
| ContactsProvider2.OrganizationDataRowHandler | |
| ContactsProvider2.PhoneDataRowHandler | |
| ContactsProvider2.PhotoDataRowHandler | |
| ContactsProvider2.StructuredNameRowHandler | |
| ContactsProvider2.StructuredPostalRowHandler | |
| ContactsUpgradeReceiver | This will be launched during system boot, after the core system has been brought up but before any non-persistent processes have been started. |
| GlobalSearchSupport | Support for global search integration for Contacts. |
| Hex | Basic hex operations: from byte array to string and vice versa. |
| LegacyApiSupport | |
| LegacyContactImporter | |
| NameDistance | A string distance calculator, particularly suited for name matching. |
| NameLookupBuilder | Given a full name, constructs all possible variants of the name. |
| NameNormalizer | Converts a name to a normalized form by removing all non-letter characters and normalizing UNICODE according to http://unicode.org/unicode/reports/tr15 |
| NameSplitter | The purpose of this class is to split a full name into given names and last name. |
| NameSplitter.Name | |
| PhotoPriorityResolver | Maintains a cache of photo priority per account type. |
| PostalSplitter | Split and join StructuredPostal fields. |
| PostalSplitter.Postal | |
| ReorderingCursorWrapper | Cursor wrapper that reorders rows according to supplied specific position mapping. |
| SocialProvider | Social activity content provider. |
| SQLiteContentProvider | General purpose ContentProvider base class that uses SQLiteDatabase for storage. |