(It can query the information of all cities in China, and supports full name, pinyin and ambiguous initials. Note: database initialization will be carried out during the first operation, and it needs to wait for 2-4 minutes. Running again does not require waiting. If you don't want to wait, you can directly convert the city in the compressed package_ The info database file is copied to the data/data/com. example in the mobile phone Note again in the searchcity/databases/folder: the program will obtain the pinyin information corresponding to the city name, and it is required to import the jar package to achieve: pinyin4j. A Jar package, including documents, has been put into the compressed package.)