Add a fragment that can display charon's log file

It continuously reads from the log file in a separate thread while displayed.

src/frontends/android/res/layout/log_fragment.xml

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+    Copyright (C) 2012 Tobias Brunner
+    Copyright (C) 2012 Giuliano Grassi
+    Copyright (C) 2012 Ralf Sager
+    Hochschule fuer Technik Rapperswil
+
+    This program is free software; you can redistribute it and/or modify it
+    under the terms of the GNU General Public License as published by the
+    Free Software Foundation; either version 2 of the License, or (at your
+    option) any later version.  See <http://www.fsf.org/copyleft/gpl.txt>.
+
+    This program is distributed in the hope that it will be useful, but
+    WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+    for more details.
+-->
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:orientation="vertical" >
+
+    <org.strongswan.android.ui.LogScrollView
+        android:id="@+id/scroll_view"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"
+        android:layout_margin="10dp"
+        android:scrollbarFadeDuration="0"
+        android:scrollbarAlwaysDrawVerticalTrack="true" >
+
+        <TextView
+            android:id="@+id/log_view"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:textSize="9sp"
+            android:typeface="monospace" >
+        </TextView>
+
+    </org.strongswan.android.ui.LogScrollView>
+
+</LinearLayout>