How to reference the custom class generated from the 5+SDK of the Dcloud platform?

H5 project is converted to Android source project, but I really don"t know how to write my own custom class
after using his own 5+SDK. I want to write a custom class with Android Source and then write business logic code in this class. Like starting a service or something. The official document is like a book of heaven to me, who has no foundation for Android. Which god can teach me. Paid teaching is also possible

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b38b88-2b98b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38b88-2b98b.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
Need Help?