androidは異なるresでのリソースidを取得する

import android.content.Context;

import java.lang.reflect.Method;

public class Rs {
    private static Context mContext;

    public static Context getContext()
    {
        if (mContext == null)
        {
            synchronized (Rs.class)
            {
                if (mContext == null)
                {
                    try
                    {
                        Class> ActivityThread = Class.forName("android.app.ActivityThread");
                        Method method = ActivityThread.getMethod("currentActivityThread");
                        Object currentActivityThread = method.invoke(ActivityThread);
                        Method method2 = currentActivityThread.getClass().getMethod("getApplication");
                        mContext = (Context) method2.invoke(currentActivityThread);
                    }
                    catch (Exception e)
                    {
                        e.printStackTrace();
                    }
                }
            }

        }
        return mContext;
    }

    private static int getIdentifier(String name, String defType)
    {
        return getContext().getResources().getIdentifier(name, defType, getContext().getPackageName());
    }

    public static int id(String name)
    {
        return getIdentifier(name, "id");
    }

    public static int layout(String name)
    {
        return getIdentifier(name, "layout");
    }

    public static int drawable(String name)
    {
        return getIdentifier(name, "drawable");
    }

    public static int anim(String name)
    {
        return getIdentifier(name, "anim");
    }

    public static int mipmap(String name)
    {
        return getIdentifier(name, "mipmap");
    }

    public static int dimen(String name)
    {
        return getIdentifier(name, "dimen");
    }

    public static int string(String name)
    {
        return getIdentifier(name, "string");
    }

    public static int color(String name)
    {
        return getIdentifier(name, "color");
    }

    public static int raw(String name)
    {
        return getIdentifier(name, "raw");
    }
}