Use first char of city name as index if it's not provided.

import android.content.res.Resources;

import android.preference.PreferenceManager;

import android.support.annotation.VisibleForTesting;

import android.text.TextUtils;

import android.util.ArrayMap;

import com.android.deskclock.R;

    /**

     * @param id unique identifier for city

     * @param formattedName "[index string]=[name]" or "[index string]=[name]:[phonetic name]"

     * @param formattedName "[index string]=[name]" or "[index string]=[name]:[phonetic name]",

     *                      If [index string] is empty, we use the first character of name as index,

     *                      If phonetic name is empty, we use the name itself as phonetic.

     * @param timeZoneId identifies the timezone in which the city is located

     */

    @VisibleForTesting

    static City createCity(String id, String formattedName, String timeZoneId) {

        final String[] parts = formattedName.split("[=:]");

        final String indexString = parts[0];

        final String name = parts[1];

        // Extract index string from input, use the first character of city name as index string

        // if it's not explicitly provided.

        final String indexString = TextUtils.isEmpty(parts[0])

                ? String.valueOf(name.charAt(0)) : parts[0];

        final String phoneticName = parts.length == 3 ? parts[2] : name;

        final Matcher matcher = INDEX_REGEX.matcher(indexString);