类似微信通讯录界面，选择国家电话区号
- 自定义侧边栏字母索引表
IndexView - 使用RecyclerView.ItemDecoration实现微信通讯录列表中字母显示
- 使用RecyclerView.ItemDecoration实现列表的分割线显示
- RecyclerView滑动到指定position,并置顶显示。可设置滑动速度
- 使用TinyPinyin实现中文转拼音，中文按拼音首字母排序
- 继承Item,实现抽象方法
- Adapter继承SimpleRecyclerViewAdapter,其中的List数据传入第一步中实现的类
- AreaCodeIndexDecoration中实现画list index view
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