Address is a widget class, to define address structure. HttpUtils is to get the json string. CharacterParser is to change chinese to Pinyin. ClearEditText can clear all the content of edittext at once. MainActivity and SubMainActivity are used to display two level dict. JSONTools is for parse json string. Take attention to use jsonarray or jsonobject. :Use jsonArray to parse [ ] data, and use jsonObject to parse { } data.