An object to convert Chinese character to its corresponding pinyin string. For characters with
multiple possible pinyin string, only one is selected according to collator. Polyphone is not
supported in this implementation. This class is implemented to achieve the best runtime
performance and minimum runtime resources with tolerable sacrifice of accuracy. This
implementation highly depends on zh_CN ICU collation data and must be always synchronized with
ICU.
Currently this file is aligned to zh.txt in ICU 4.6
来自android4.2源码