(Programming foundation, quite effective, suitable for beginners Note: The document can be previewed online for up to 30 pages, which is comprehensive. You need to download this book~the main content of this book. This book covers the basic concepts of Android programming using the Android SDK, which is divided into 12 chapters and 3 appendices. "Chapter 1: Introduction to Android Programming" introduces the basic concept of Android operating system and its development at that time. You can understand the various functions of Android devices and some popular devices in the market. You can also learn how to download and install all necessary tools to develop Android user programs and test them on the Android simulator. "Chapter 2: Flow, Fragment and Purpose" enables you to understand the three most important concepts in Android programming. Flow and fragmentation are the building blocks of Android user programs. You will learn how to use purpose to link flows to form a complete Android user program. This is one of the common features of the Android operating system. "Chapter 3: Android User Interface" introduces the different components of the user interface of the Android user program. You will learn about the different layouts used to build the user interface of the user program, and the various things associated with the user interface when the user interacts with the user program.......)