| As the first civil mobile phone to be launched by Motorola, mobile phones become an integral part of people's daily lives, and the users who own a mobile phone are constantly increasing. As a tool for people to exchange information, the most important feature of mobile phone is that one can call anyone at anytime and anywhere. In recent years, mobile phone users have not been satisfied by the simple function of calling, they may want a set of communications, entertainment, learning, business and other functions as one of the mobile terminal. As the rapid development of 3G communication technology, coupled with the continuous improvement of hardware manufacturing technology, smart phones came into being. The most important feature of the smart phone is its operating system (OS). The current mainstream operating system of mobile phone, including Nokia's Symbian, Google's Android, Microsoft's Windows Mobile, RIM's BlackBerry OS, and Apple's iPhone OS.Android system is the first open-source mobile operating system; it is favored by the majority of mobile phone developers and ordinary users. Compared with the thriving development of Android system, Motorola's mobile phone business becomes from bad to worse. With Motorola's bet on Android system, its mobile phone business gradually restores the Declining tendency. In China, Motorola and China's three major telecom operators work together to develop Android market. Titanium system is developed by the Motorola Company and China Telecom; it is the smart phone operating system in Android2.2 platform which first supports GSM and CDMA's dual-mode dual standby.This thesis is based on the calling application in Titanium system; it studies the design and implementation of the call application. First, describe briefly the background of the project and author's main work. Then describe the network were involved in calling applications-GSM and CDMA technology and calling processes, as well as characteristics of Android platform and application. Then briefly introduced the situation of Android system, analyze the calling application's requirements, and the overall design and module division. Then according to the requirements based on analysis and module design, finish the design and implementation of the entire calling application, which are the most important content of this thesis. This section first describes the application of the initialization of the calling application, and then introduces the design and implementation of mobile original, mobile terminated, and three-way calling functions, and finally describes the calling Ul's design and implementation. In the last part of this article, I summarize the work done, and the future work and development prospect. |
