Android broadcast connection realizes monitoring phone status (phone status, interception)

First, let's understand the mechanism of the next listener.

Android has two event handling mechanisms: listening and callback.

A event handling based on listening

It mainly involves three types of objects: eventsource, event and EventListener

The flow chart of event handling by the listening mechanism is as follows (delegation):

1: You need to add permissions to the androidmanifest.xml list

2: Pay attention to the level of events when registering for broadcasting (level - 1000 ~ 1000 in Android)

See androidmanifest.xml for detailed configuration

3: Write the broadcast implementation class. Here, you need to inherit the broadcastreceiver to implement the onReceive () method

The source code of the program is as follows:

The above content introduces the relevant knowledge of Android broadcast connection to monitor the phone status (phone status, interception). I hope it will be helpful to you!