Yang Yi is an author about whom limited public information is available. Within this catalog, one work by this author is held: Android Mobile Application Development. Judging from its subject, the book addresses learners of mobile app development and centers on building applications for the Android platform, placing it in the category of practical technical writing. Because public information on the author's life, education, and professional experience is lacking, no further account of the author's personal background can be given, nor can the overall character of the author's writing style be assessed. Based on the available work, it may be inferred that the author focuses on the fundamentals and hands-on practice of mobile development, emphasizing clear explanation of platform knowledge and the development workflow for beginners. Readers seeking a fuller picture of the author's writing would need to consult the book itself and related publication notes.