Phone Framework Summary (source code)

Call Phone Framework Summary

No matter how mobile phone development, the most basic and important functions of mobile phone is still communication, specifically, call, text messaging, MMS related data Services, the use of Internet functions.

The entire Android communication framework can be divided into 4 levels from the bottom up:

1, Modem ----This is the entire communication hardware basis, need modem chip, different formats need to use different modems;

2, RIL ----in order to adapt to different modem chip and abstraction of the middle layer, used to convert the modem instruction into Java available data stream;

3. Telephony in the framework ----This is the framework of the framework, which provides the ability for the developers to operate the communication services;

4, Application ----This is the most upper-level applications, direct user-oriented, providing dial-up, Internet, texting interface;

Phone call is one of Android's important business, providing external communication, data business, contact related, network interaction, voice, Bluetooth and other related functions of the underlying business processing

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Phone Framework Summary (source code)