(1. This set of videos is an android development tutorial closely integrated with enterprise level development, which has been kept in the teaching level. 2. This set of video knowledge points is highly concentrated, no nonsense, full of dry goods. It is not only suitable for Android beginners, but also suitable for developers who have been engaged in Android development for 2-3 years and want to deeply understand the principles and details of Android. 3. All knowledge point projects in this set of video explanations are driven by enterprise level development examples, and will never be left in the demo level explanations. 4. This video is not limited to the explanation of Google android, but also introduces some common open-source android frameworks used by enterprises, such as ASYNCHTTP framework, smartImageView framework, AndroidAnnotation framework, etc. 6. Lecturer introduction to 120 episodes: Zhang Zehua has a double bachelor's degree in software engineering and computer software development, and has been certified as a network engineer by the Ministry of Information Industry of the People's Republic of China. He has gone to Nottingham, England, and Ireland for exchange studies. He has successively worked in Nortel, CIeNET, Ericsson (the most potential engineer), Boyan Technology (project manager), and other well-known enterprises. The teaching content is rich and sufficient, and the case explanation is close to the office, which is easy to understand. He is good at combining practical cases in office work and deepening students' understanding of knowledge points through layers of guidance and simple methods.)