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Extraction code:1234 "Android mobile application development tutorial" systematically introduces the development technology of Android mobile application, and reasonably designs a scale case according to the characteristics of classroom teaching, which not only meets the learning needs of students, but also ensures the progress of classroom teaching. "Android Mobile Application Development Tutorial" first introduces the basic knowledge of Android development, including development process, environment construction, project creation, Java programming foundation, UI design and activities, and then explains the data storage in Android, including file storage.