(This file exceeds the upload limit. Please download the txt text, which is the download address of Baidu online disk. It can be downloaded without deduction. The Practice of Android Commercial Software Development Project: Taking the Mobile Phone Guardian as an Example, the full development process of a mobile phone security and monitoring software is explained in detail. It covers the security strategy of Android program development, market demand analysis of mobile phone Guardian software, software introduction, architecture design, testing, debugging, iteration, software data durability and management, data protection process and core code implementation, as well as the design and implementation of each module.)