FYI - пример использования MergeCursor ()
c = Курсор, содержащий столбцы контактов из Contacts.CONTENT_URI
private Cursor mergeCursorSubset(Cursor c) {
int userMobile = ContactsContract.CommonDataKinds.Phone.TYPE_MOBILE,
workMobile = ContactsContract.CommonDataKinds.Phone.TYPE_WORK_MOBILE;
String storedNumber = ContactsContract.CommonDataKinds.Phone.NUMBER,
displayName =ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME,
numberType = ContactsContract.CommonDataKinds.Phone.TYPE,
contactKey = ContactsContract.CommonDataKinds.Phone.LOOKUP_KEY,
whereClausePre = contactKey+" = '",
whereClausePost = "AND ("+numberType+" = '"+userMobile+"' OR "+numberType+" = '"+workMobile+"'";
Uri lookupUri = ContactsContract.CommonDataKinds.Phone.CONTENT_URI;;
Cursor [] m = new Cursor[c.getCount()];
if (c.moveToFirst())
for (int k = 0; k<c.getCount();k++){
//Find the mobile numbers
Cursor u = this.getContentResolver().query(lookupUri,
new String[]{displayName, storedNumber, numberType}
, whereClausePre+c.getString(c.getColumnIndex(Contacts.LOOKUP_KEY))+"') "
+ whereClausePost, null, null);
int i = 0;
if (u.moveToFirst())
m[i++] = u;
} //for Each key
return new MergeCursor(m);
}