| Android is a software platform and operating system based on Linux kernel, which was originally developed by the Google, and now it is developed and maintained by the Open Handset Alliance. Android is based on the software stack, which is mainly composed of three parts. The Lower layer is based on Linux kernel, and it only provides the basic functions, and the middle layer is composed of the function libraries and the virtual machine, and the upper layer includes a variety of applications, such as message program, SMS program and so on, which are generally developed with the Java language development.At present, Android mobile phone operating system has become the most widely used smart phone operating system. The mobile services based on Android have been supported by many companies and enterprises, and the companies have developed services with its own Android phone application software features. Android mobile platform can effectively support the innovation of the mobile devices, and can provide the users with the more superior mobile services. While, it also gives the developers a more open and more convenient level of collaboration, and greatly improves the speed and capacity of developing the new mobile devices. CMB Harbin Branch has as well made useful explore in the field, and try their best to organize and develop the application software of Mobile Banking.According to the above problems and the need in the work, based on the Android platform, we design and implement the currency calculator module in mobile banking of CMB Harbin branch with the help of Google Android SDK, the JAVA Eclipse and other development tools. The module uses the latest real-time online exchange of the People's Bank of China, and uses the XML language to design the framework, and uses the JAVA language to implement the function modules, and finally achieves the different exchange rates between national currencies.The system implemented in the paper achieves all the intended target. The experiments show that the module developed in this paper run stably on all mobile phones and mobile devices based on Android, and the module can provide users with accurate real-time currency conversion services. The module designed and implemented in the paper can play the important role in the mobile banking of CMB Harbin Branch, and can form complete financial services, which enrich the types of mobile services and have a good prospect. And it has good application prospects, and it is valuable for other similar works.The main structure of this paper is as follows:Chapter 1 mainly introduces the background, and describes the reason of developing the module, the design goals and the main work of the paper.Chapter 2 mainly introduces the technology and knowledge used in developing the module, which include how to construct the Android platform, how to develop the simple Android program, how to use the XML language, the using method and skill of the main component of Android and so on.Chapter 3 mainly introduces the instructions and examples of widgets used in developing the module, in order to facilitate the design process. At the same time, Chapter 3 introduces the main interface of the layout and the division of the main sub-modules, which is prepared for the design and implementation in Chapter 4.Chapter 4 mainly introduces the detailed design and implementations of the module, and it describes in detail the detail implementations of the core modules(main.xml, string.xml, Currencies.java), the specific technical details and implementation difficulties of getting the latest exchange rate of the Chinese People's Bank and so on.Chapter 5 mainly describes the running and testing condition of the system, which includes the running interfaces and simple descriptions of the main function modules. It further proves the feasibility and practical value of the work of this paper.Chapter 6 summarizes the study of the paper, and gives the future works. |
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