import android.provider.Contacts.People;
import android.content.ContentUris;
import android.net.Uri;
import android.database.Cursor;

// Use the ContentUris method to produce the base URI
// for the contact with _ID == 3.
Uri myPerson = ContentUris.withAppendedId(People.CONTENT_URI, 3);

// Alternatively, use the Uri method to produce the base URI.
// It takes a string rather than an integer.
Uri myPerson = Uri.withAppendedPath(People.CONTENT_URI, "3");

// Then query for this specific record:
Cursor cur = managedQuery(myPerson, null, null, null, null);