Add utility functions for ICU plural strings

import android.content.Context;

import android.icu.text.MeasureFormat;

import android.icu.text.MeasureFormat.FormatWidth;

import android.icu.text.MessageFormat;

import android.icu.text.RelativeDateTimeFormatter;

import android.icu.text.RelativeDateTimeFormatter.RelativeUnit;

import android.icu.util.Measure;

import com.android.settingslib.R;

import java.util.ArrayList;

import java.util.HashMap;

import java.util.Locale;

import java.util.Map;

/** Utility class for generally useful string methods **/

public class StringUtil {

        return formatRelativeTime(context, millis, withSeconds,

                RelativeDateTimeFormatter.Style.LONG);

    }

    /**

     * Get ICU plural string without additional arguments

     *

     * @param context Context used to get the string

     * @param count The number used to get the correct string for the current language's plural

     *              rules.

     * @param resId Resource id of the string

     *

     * @return Formatted plural string

     */

    public static String getIcuPluralsString(Context context, int count, int resId) {

        MessageFormat msgFormat = new MessageFormat(context.getResources().getString(resId),

                Locale.getDefault());

        Map<String, Object> arguments = new HashMap<>();

        arguments.put("count", count);

        return msgFormat.format(arguments);

    }

    /**

     * Get ICU plural string with additional arguments

     *

     * @param context Context used to get the string

     * @param args String arguments

     * @param resId Resource id of the string

     *

     * @return Formatted plural string

     */

    public static String getIcuPluralsString(Context context, Map<String, Object> args, int resId) {

        MessageFormat msgFormat = new MessageFormat(context.getResources().getString(resId),

                Locale.getDefault());

        return msgFormat.format(args);

    }

}