Android : Android: why my class is still obfuscated though proguarded

In the package, /ui/cinema/model/, there are several classes I didn't want them to be obfuscated, so i declare the following lines in my proguard config file:

-keep public class com.example.ui.cinema.model.** {*;}

-keep public class com.example.ui.cinema.model.**$* {*;}

For most of the classes in that foler, it's working fine, except "CinemaCityModel":

package com.example.ui.cinema.model;
public class CinemaCityModel
{
    public static final String CUR_CITY_NAME_SORT="CURRENT";
    public static final String HOT_CITY_NAME_SORT="HOT";

    private String CityId;
    private String CityName; 
    private String NameSort; 

    public String getCityId()
    {
        return CityId;
    }

    public void setCityId(String cityId)
    {
        CityId = cityId;
    }

    public String getCityName()
    {
        return CityName;
    }

    public void setCityName(String cityName)
    {
        CityName = cityName;
    }

    public String getNameSort()
    {
        return NameSort;
    }

    public void setNameSort(String nameSort)
    {
        NameSort = nameSort;
    }

}

I anti-compiled the apk, and cannot find CinemaCityModel. But it's in that package in my sourcecode. It's obfuscated and i dont know why. Anyone met this? Please help, thanks :)