ContentObserver for Camera Button?

I have tried to detect when camera button is pressed using Broadcastreceiver but it doesn't work, and I don't understand why (maybe my phone is the problem). Now, I want to know if is it possible to do this using ContentObserver. Is possible开发者_StackOverflow社区? If yes, can you give me an example...

Thanks in advance..

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BroadcastReceiver, not ContentObserver.

<receiver android:name=".CameraButtonBroadcastReceiver">
    <intent-filter>
        <action android:name="android.intent.action.CAMERA_BUTTON"/>
    </intent-filter>
</receiver>

You should implement CameraButtonBroadcastReceiver class, which is a subclass of BroadcastReceiver.

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I am not 100% positive on this but the camera button might be one of those intent that cannot be declared in the manifest. Try registering it in a service and see if that works