Android uses broadcastreceiver to listen for changes in network connection status

You only need to implement the following two codes to monitor the network connection status. Don't forget to add network access permissions to manifest.xml.

1. Define broadcast receiver

NetState.java

2. Register broadcast receiver

Add in activity:

Knowledge points of broadcast receiver

Every time a message is received, onReceive (context, content) is called to process it.

Intent can deliver data, implement custom broadcast events, and then send them through sendbroadcast (intent). Process the received data through the onReceive () method.

Note: if the code execution time in onReceive () method exceeds 5S, Android will ANR.

1. Use broadcast receiver

2. Register broadcast receiver (2 methods)

1) . in manifest.xml:

2. Oncreate () is implemented in Java code in activity

3) cancel the registration Receiver when appropriate, cancel it in the program, and call the following function in onDestroy ().

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