Android : Check phone number present in Contact List ? (Phone number retrieve from phone call)

I make a BroadcastReceiver to receive Phone number of the person who call me

<intent-filter>
<action
    android:name="android.intent.action.PHONE_STATE" />
</intent-filter>

1. How to check if the phone number receive is on my contact list ?
   Do you have a tip to know if this phone number exist on contact list with out loading contact list ?
   I don't want more information, just if this phone number exist.

2. If it's not possible, and I must load contact list, how to do it on BroadcastReceiver ?
   When I try to do getContentResolver, it's not working because I'm on BroadcastReceiver and not inside Activity...

Thanks for your help