(A code is more used than any Android air ticket booking client, which realizes the functions of air ticket query, hotel query, order management, order review, system settings, etc. It uses the LIB library ksoap2-android-assembly-2.3-jar-with-dependencies.jar, which has been put into the download package, and is equipped with an adapter for self defining the main interface. Database part: The framework function must exist near the subclass of SQLiteOepnHelper, and the framework function near the parent class must be called through super. A database can be created or opened only after the getReadableDatabase() method or getWriteableDatabase() method of the DatabaseHelper object is called.)