The Software Design Of The Vehicle Smartphone Monitoring System Based On Android

Nowadays, with higher computing and memory capability, smart phone even exceeds PC in its performance. Portability, the traditional feature of cell phone, matching with high performance of smartphone, makes smartphone an Electronic Honey of human beings. Because the data stored in the users’ smartphone have high individuality, users hope that all computation tasks of car navigation and document edition can be finished locally on the phone, so as to evade away from the complexi ty of data transmission or cut costs of remote data processing. However, due to constraints with the size of portable smartphone, many calculation tasks, which could have been dealt with by smartphone, have to be handled by other electrical devices remotely, just because of the restriction of man-machine interaction.Aimed at the contradictions, this paper puts forward a concept of smartphone being used for u biquitous computing terminal ization. In view of the idea, it has tried to be applied into the field of in-vehicle, that is, software design of smartphone monitoring system on-board. Based on the principle of remote desktop control, it is aimed to take the on-board display screen as the display of smartphone and controller. T hus, on the premise of normal human-computer interaction, the computing tasks such as navigation and music playback, traditionally done by vehicle electronic equipment, are transferred to the smartphone system. In theory, because this design is based on remote desktop, the core theory for the research is fast video compression algorithm. In this paper, on the basis of the concept of distributed coding framework, the classic H.264 integer DCT algorithm is optimized, to design the core compression algorithm suitable for this system. In e ngineering, on the foundation of the optimiz ed classical VNC remote desktop protocol, the application layer communication protocol is designed in this paper, suitable for this system. At the same time, the author makes reasonable use of multithreading soft ware design and JNI technology, to improve the timeliness performance.Experimental results show that image quality calculated with the algorithm has reached the level of lossless compression. It has reduced the calculating work of contracted-quantized stage of the integer DCT algorithm coder to one integer constants addition operation. Compared with the corresponding module of H.264, the performance-to-price ratio of image quality and compression rate is increased by 23.9%.Meanwhile, in sufficient and reas onable use of the CPU and other hardware resources, without any support from hardware encoding, the delay of system frame is 800 milliseconds on average, and the average frame rate reaches 1.81 per second. It has realized multi-touch control, with time-delay in control less than 200 milliseconds. After the tests, it shows that the performance of system meets the requirements of computing tasks of vehicle navigation, phone answering and music playback done on the vehicle. The conclusion is that the designed system has reached the expected goal.