Introduction
This open source and free application blocks unwanted calls on a rule-based logic, with number pattern recognition.
The main-home activity controls a background service that listens to incoming calls.
When an incoming call is detected, the service loops through the list of active filters,
and for each filter, when a pattern is matched a custom action is performed, like dropping the call,
logging the event or sending a warning message.
Central to this design is the definition of a filter:
A filter is assembled by combining two rules and one action: a calendar rule to define
when the filter is active, a filter rule to define the numbers and patterns against which
the incoming call is matched and an action to be performed when the filter is active and
there is a match.