Apps Catch wifi state evolution

[kujaff]

Hi

I want to catch intents who are sent when wifi state is changed. By i don't receive anything

<receiver android:name=".wifi.WifiReceiver">
<intent-filter>
<action android:name="android.net.wifi.STATE_CHANGE"/>
</intent-filter>
</receiver>

This never call onReceive of my receiver.

How can i do this please ?