call content observer

private class RatedCallsContentObserver extends ContentObserver {
    Handler mHandler;

    public RatedCallsContentObserver(Handler h) {
        super(h);
        mHandler = h;
    }

    @Override
    public boolean deliverSelfNotifications() {
        return true;
    }

    @Override
    public void onChange(boolean selfChange) {
        //here is where you handle the call log change
        //it may be a good idea to ensure that the call log application is already running before bringing your app to the foreground
        //to ensure it is displayed on top of the call log app

        super.onChange(selfChange);
    }
}


//later in the Service, attach the appropriate content URI to an instance of our observer
this.getApplicationContext().getContentResolver().registerContentObserver(android.provider.CallLog.Calls.CONTENT_URI, true, new RatedCallsContentObserver(internalHandler));