(Teacher Li Xinghua's very good information, this is a comprehensive code, welcome to download! Chapter 1: Understanding Android - Introduction to Android Development 0102_ Build Android development environment 0203_ Activity Start 0204_ Basic Controls in Android (I) 0205_ Layout Manager 0206_ Android Event Management 0207_ Basic Controls in Android (Part 2) 0308_ Data storage 0309_ Android Component Communication 0410_ Multimedia Technology 0411_ Mobile service 0412_ Network communication 0413_ Location service)