Telephony State Information and Android Telephony Classes

The previous chapter showed how to use Android's built-in PhoneApp application, which simplifies the task of placing of phone calls. This chapter shows you how to get more information about telephone service and the actual calls you make.

After an example that puts one of the telephony features to use, we'll present a short guide to PhoneApp internals.

We use the term "telephony" to refer to the parts of the Android system that depend on a radio communicating with the public land mobile network (PLMN) to provide communication and location functions. Sharing the use of this radio among multiple applications is a key goal for Android's telephony modules.

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