Complex array in AutoCompleteTextView

I have a list of the countries stored into XML, as follows:

<?xml version="1.0" encoding="utf-8"?>
<resources>
<string-array name="nation_array"> <item>Afghanistan</item> <item>Albania</item> <item>Algeria</item> <item>American Samoa</item> <item>Andorra</item> <item>Angola</item> <item>Anguilla</item> <item>Antarctica</item> ................
</string-array>
</resources>

Adapter:

String[] countries = groupContent.getResources().getStringArray(R.array.nation_array);
ArrayAdapter<String> nationAdapter = new ArrayAdapter<>(mContext, R.layout.simple_list_item_1, countries);
autoCompleteTextView.setAdapter(nationAdapter);

And everything works fine. But now it turned out that need to drop-down list to show the name of the country, but when sending a double-digit use the abbreviations of countries, such as United States - US.

<?xml version="1.0" encoding="UTF-8"?>
<country-list>
<country> <name>Абхазия</name> <english>Abkhazia</english> <code>AB</code>
</country>
<country> <name>Австралия</name> <english>Australia</english> <code>AU</code>
</country>
<country> <name>Австрия</name> <english>Austria</english> <code>AT</code>
</country>
<country> <name>Азербайджан</name> <english>Azerbaijan</english> <code>AZ</code>
</country>
.............
</country-list>

Q: How does it realize, tell me? Nowhere are such examples found