| GlobalSearchSupport | Support for global search integration for Contacts. | 
| Hex | Basic hex operations: from byte array to string and vice versa. | 
| LegacyApiSupport | |
| LegacyApiSupport.LegacyTables | |
| 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. |