The document discusses 7 ways that Android applications can be vulnerable, including intent hijacking, intent spoofing, sticky broadcast tampering, insecure storage of data, insecure network communication, SQL injection, and allowing applications to have promiscuous privileges. It provides descriptions and examples of each vulnerability and recommends ways to address the security issues, such as using explicit intents that require permissions, securing data storage, and limiting application privileges. The goal is to help developers avoid introducing vulnerabilities that could allow attackers to compromise user data or alter application behavior.