[Bridge] Dispatcher does not send events when phone is locked.

[jamesfzhang]

I'm working on an app that plays music, and when one song ends the next one starts. The audio player is a bridged Native Module. A song's onStop callback triggers an event that RCTEventDispatcher sends. This is fine when the app is in the foreground or background. When the screen is locked, the event is lost somewhere between the dispatcher and the receiver.

When the phone is locked, only "sent!" is logged:

// AudioPlayer.m

- (void)audioPlayer:(STKAudioPlayer *)player stateChanged:(STKAudioPlayerState)state previousState:(STKAudioPlayerState)previousState
{
  if (state == STKAudioPlayerStateStopped) {
    NSLog(@"sent!");
    [self.bridge.eventDispatcher sendAppEventWithName:@"AudioPlayerEvent"
                                                 body:@{@"name": @"onStop"}];
}

// Receiver.js

NativeAppEventEmitter.addListener('AudioPlayerEvent', (event) => {
  console.log('received!');
});

Is there a setting that must be enabled to accommodate the dispatcher while the phone is locked?

[jamesfzhang]

Anyone care to take a look at this, please? :)

[ide]

If you encounter an issue the best way to get it fixed is to submit a PR with the right solution. There are only a handful of people working on RN and over 500 open issues and many PRs so high-quality PRs that are easy to maintain will get more attention.

[jaygarcia]

I've run into this personally. The solution i've found is to call an execution block when the phone is brought alive to update the state of the UI. However ALL -- absolutely ALL of the audio controls are routed through objc.

[jaygarcia]

@ide one issue with suggesting PRs is that someone can spend hours on a PR only for it to get rejected and/or ignored, even if it's a good solution. For example, I've submitted a PR allowing web views to cache contents -- something that is almost expected. That PR was ignored.

[mintuz]

This is a duplicate, the information provided here may help you. #1282

[jamesfzhang]

Thanks @mintuz