[android-developers] How can my app check if a wired headset is connected?

Using Intent.ACTION_HEADSET_PLUG, my app can be notified when a wired
headset is plugged or unplugged.

But how can it determine whether or not it's plugged in when it starts
running?

The closest thing I can find is AudioManager.isWiredHeadsetOn() which
"checks whether audio routing to the wired headset is on or off" - but
the headset can still be connected without audio being routed to it.

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