A flutter plugin to handle Phone Call State and execute a Dart callback in background.

This plugin only supported in android platform.

Corrently IOS is not supported. Unfortunately I'm not familiar with IOS development neither with Switf/ObjC languages, so if you wish to help any PR will be welcome.

After importing this plugin to your project as usual, add the following to your AndroidManifest.xml within the <manifest></manifest> tags:

<uses-permission android:name="android.permission.READ_PHONE_STATE" />
<uses-permission android:name="android.permission.READ_CALL_LOG" />

Also, apparently it is necessary to register the broadcast receiver manually, otherwise an error will be throw saying that our receiver does not exist inside the app. Within the <application></application> tags:,

<receiver android:name="me.sodipto.phone_state_background.PhoneStateBackgroundServiceReceiver"
    android:exported="false">
    <intent-filter>
        <action android:name="android.intent.action.PHONE_STATE" />
    </intent-filter>
</receiver>

All you need to start using our package after installing it, is defining a callback which must be a top level function or static function, that will be called by our plugin when any incoming or outgoing call events are detected.

@pragma('vm:entry-point') // Be sure to annotate your callback function to avoid issues in release mode on Flutter >= 3.3.0 void phoneStateBackgroundCallbackHandler(PhoneStateBackgroundEvent event, String number, int duration)

This callback handler must accept 3 arguments:

• phoneStateBackgroundEvent: The event type detect by our plugin in background.

• number: The incoming/outgoin number that is triggering the phone state call.

• duration: An integer that represents the duration of the call in seconds.

The PhoneStateBackgroundEvent is an enum with four possible values:

Since all this process happens in background in a Dart Isolate, there's no guarantee that the current OS will call the registered callback as soon as an event is triggered or that the callback will ever be called at all, each OS handle background services with different policies. Make sure to ask user permission before calling the PhoneStateBackground.initialize method of our plugin. Check the example to see a simple implementation of it.

/// Defines a callback that will handle all background incoming events
@pragma('vm:entry-point') // Be sure to annotate your callback function to avoid issues in release mode on Flutter >= 3.3.0
Future<void> phoneStateBackgroundCallbackHandler(
  PhoneStateBackgroundEvent event,
  String number,
  int duration,
) async {
  switch (event) {
    case PhoneStateBackgroundEvent.incomingstart:
      print('Incoming call start, number: $number, duration: $duration s');
      break;
    case PhoneStateBackgroundEvent.incomingmissed:
      print('Incoming call missed, number: $number, duration: $duration s');
      break;
    case PhoneStateBackgroundEvent.incomingreceived:
      print('Incoming call received, number: $number, duration: $duration s');
      break;
    case PhoneStateBackgroundEvent.incomingend:
      print('Incoming call ended, number: $number, duration $duration s');
      break;
    case PhoneStateBackgroundEvent.outgoingstart:
      print('Ougoing call start, number: $number, duration: $duration s');
      break;
    case PhoneStateBackgroundEvent.outgoingend:
      print('Ougoing call ended, number: $number, duration: $duration s');
      break;
  }
}