fix some bugs. When you receive a new chat, a notification appears.
Need some improvements cause if the chat was created before, then close no
notification appears (nofif only on new created chat).
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>