OK, after digging into the android system code, I think I figured out
what's wrong here... the class "HeadsetObserver" from the base system
actually sends out this intent with its FLAG_RECEIVER_REGISTERED_ONLY
flag set... obviously, there's no way to receive this intent without
implementing a service.

On 15 Feb., 12:59, Henning Schaefer <henning.schae...@gmail.com>
wrote:
> Hi all,
>
> yesterday, I spent several hours trying to figure out how to capture
> the HEADSET_PLUG intent with a BroadcastReceiver. The manifest defines
> the <receiver>, with its intent-filter set to <action
> android:name="android.intent.action.HEADSET_PLUG" />.
>
> The receiver is working correctly (I verified that by changing the
> intent filter to capture things like SMS_RECEIVED including the proper
> permissions and the receiver fired as expected on receiving an SMS),
> but when listening for HEADSET_PLUG, it never fires. Debugging the
> whole thing is a bit complicated, as the emulator doesn't seem to
> support headsets and I have to disconnect my target device (a HTC
> Dream) from USB in order to attach a headset (so there's no logfile
> viewing). Are there any special permissions required for applications
> to capture the HEADSET_PLUG intent (and if so, which? I've tried
> several, to no avail)?
>
> Maybe the Dream doesn't fire such an intent at all (that'd be bad luck
> for me), but I guess that it must be an issue related to application
> permissions. The documentation says extremely little (well, actually:
> nothing) about the single permissions needed to perform all the
> actions described in the API docs, so this is absolutely something to
> be improved.
>
> What I want to do: Upon detecting a headset, I want to re-route the
> ringtones from the speakers to the headset, so as not to annoy people
> in my vicinity by a harsh ringing sound (I'm used to this behaviour
> from my old phone) - by default, the speaker just keeps on ringing, no
> matter whether a headset is attached or not. This part is already
> working, but now I need to know how to detect headset attachment/
> detachment events.
>
> Thanks in advance,
>
> Henning
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