In order to support colorful variety of mobile life, to facilitate people information memo recording and privacy encryption, our project, under the guidance of software engineering theory, has designed and implementeda multifunctional, self-adaptive multi-resolution Android platform software with fast response time, and user-friendly interface. This paper takesthe entire software development life cycle as the mainline, introduces in detail the system planning, system analysis, system design, system implementation as well as system test, and focuses on the key technologies of client design and implementation. The kernel functions include: AUDIO / VIDEO / IMAGE file viewing, cutting, insertion and recording, image scanning, partly free screenshot; The application of sensor technology; The realization of the function of the FTP remote management; Touch gesture recognition input; Location positioning; encryption of the memo, etc.