identifying a number that is stored in the contacts during an incoming or outgoing call

There's a class that iextends BroadcastReceiver.I have the action "isNumberStored (Context context, String number)" which returns "true" if a phone number (string of numbers) exists in the contacts. When a incoming or outgoing call starts I want to get the phone number and than check if the number is stored in my contacts or not. How can I apply this?

my class :

public class CallReceiver extends BroadcastReceiver {

    @Override
    // ^ detecting incoming and outgoing calls ^
    public void onReceive(Context context , Intent intent) {
     
        if (intent.getStringExtra( TelephonyManager.EXTRA_STATE ).equals( TelephonyManager.EXTRA_STATE_OFFHOOK )) {
          //Call started

        } else if (intent.getStringExtra( TelephonyManager.EXTRA_STATE ).equals( TelephonyManager.EXTRA_STATE_IDLE )) {
           //Call ended

        } else if (intent.getStringExtra( TelephonyManager.EXTRA_STATE ).equals( TelephonyManager.EXTRA_STATE_RINGING )) {
             //Incoming call
            }
    }


    //Check if number is stored in Contacts list  (Truth = exists).

    public boolean isNumberStored(Context context, String number) {
        Uri lookupUri = Uri.withAppendedPath(
                ContactsContract.PhoneLookup.CONTENT_FILTER_URI,
                Uri.encode(number));
        String[] mPhoneNumberProjection = { ContactsContract.PhoneLookup._ID, ContactsContract.PhoneLookup.NUMBER, ContactsContract.PhoneLookup.DISPLAY_NAME };
        Cursor cur = context.getContentResolver().query(lookupUri,mPhoneNumberProjection, null, null, null);
        try {
            if (cur.moveToFirst()) {
                cur.close();
                return true;
            }
        } finally {
            if (cur != null)
                cur.close();
        }
        return false;
    }
}