In continuation with the previous blog, we would continue to build our new basic SMS app using Flutter. In this blog, we would see how we can add the functionality of listening for incoming SMS messages on the device.

We are using the sms package for building this app. Please check out the previous blog to get the brief intro on how to use this package.

Create an instance of sms receiver.

SmsReceiver receiver = new SmsReceiver();

Now we need to use the receiver we created above to bind a listener for the SMS message received event. We use the .listen method on the onSmsReceived event of the receiver which excepts a callback and gives us the received message object as an argument whenever a new message is received by the device.

receiver.onSmsReceived.listen((SmsMessage msg) =>
    #Do something
);

SMSMessage, contains sender, message and date of the SMS message. Internal implementation of SMSMessage class is given below:

class SMSMessage {
  String message;
  String sender;
  var date;
}

Now you can start a message listener like shown above, and detect all the incoming SMS messages on the user's phone.

In the next blog, we will set up a mailer, which will be used to email the incoming SMS message to a particular email.