iphonesdkdetectheadset

Detect headset button click on iPhone SDK


Is there a way to detect the headset's play/pause button click?

I managed to detect the volume buttons clicks using:

AudioSessionAddPropertyListener( kAudioSessionProperty_CurrentHardwareOutputVolume , audioVolumeChangeListenerCallback, self );

But I can't find an AudioSessionProperty for the center button. What's the way to do that?


Solution

  • Everything that's done from outside your app is considered a "Remote Event". If you double-tap the Home button and press Play/Pause there, it's the equivalent of pressing the play/pause button on the headset (Same for double tapping for next, and triple tapping for previous).

    Here's the guide on event handling of remote events for iOS.

    Personally, I like subclassing the MainWindow (UIWindow) and overriding the sendEvent: method, so I can manage it more directly:

    - (void)sendEvent:(UIEvent *)event
    {
        if (event.type == UIEventTypeRemoteControl)
        {
            // Do stuff here
        }
        else
        {
            // Not my problem.
            [super sendEvent:event];
        }
    }
    

    Hope that helps, the enum for the event of the central button is UIEventSubtypeRemoteControlTogglePlayPause.