当仅使用BroadcastReceiver时，FLAG_RECEIVER_REGISTERED_ONLY是否有解决方法？

Question

I want to be alerted, if a headset is plugged in. But the Intent "ACTION_HEADSET_PLUG" is used with the Flag "FLAG_RECEIVER_REGISTERED_ONLY". So I have to run a service or a activity all the time to get the intent? I just want to run a Broadcastreceiver and NO service or activity at all. Is there a workaround for this? Is this even possible? Or can I start a service once, registering and then stopping it?

PS: I know when the headset is plugged off with the becoming noisy intent.

Thank you for you answers.

Answer 1

Dianne Hackborn says

It's only given to those who call registerReceiver, and not sent to receivers declared in manifests.

So you have to have something running that calls registerReceiver . It that stops running and you don't unregister the receiver you get an error.

Answer 2

There are components that should be registered when the application is installed (<3.0), or at least when the application has to started (3.0 & ICS), such as a ContentProvider .

The provider apparently doesn't have an "end" to it's life cycle that you have to worry (a lot) about.

Simply put, adding a <provider> to your AndroidManifest.xml :

<provider android:name=".ReceiverProvider"
    android:authorities="some.provider.authority.goes.here"
    android:exported="true" />

And, for the ReceiverProvider :

public class ReceiverProvider extends ContentProvider {
    @Override
    public boolean onCreate() {
        BroadcastReceiver receiver = new BroadcastReceiver() {
            @Override
            public void onReceive(Context context, Intent intent) {
                System.out.println("Headset plug: " + intent);
            }
        };
        IntentFilter filter = new IntentFilter(Intent.ACTION_HEADSET_PLUG);
        getContext().registerReceiver(receiver, filter);
        return true;
    }

    @Override
    public Cursor query(Uri uri, String[] projection, String selection, String[] selectionArgs,
            String sortOrder) {
        return null;
    }

    @Override
    public String getType(Uri uri) {
        return null;
    }

    @Override
    public Uri insert(Uri uri, ContentValues values) {
        return null;
    }

    @Override
    public int delete(Uri uri, String selection, String[] selectionArgs) {
        return 0;
    }

    @Override
    public int update(Uri uri, ContentValues values, String selection, String[] selectionArgs) {
        return 0;
    }
}

Worth trying perhaps.