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+# coding=utf-8
+
+"""Package a Sugar activity to produce a bundle.
+
+Below is a simple Sugar activity which displays a static image. It is very
+boring, but does not need changing. In this exercise, you must add the relevant
+files to git and then build a bundle for the activity and install it on a
+physical XO laptop.
+
+Before packaging the activity, an icon needs to be created.
+
+ 1. Open Inkscape and create a new 48×48 pixel icon (‘icon_48x48’ template).
+ 2. Draw the icon, using only a single stroke colour and a single background
+    colour. Save it as activity/activity.svg.
+ 3. Open the created SVG file with a text editor and replace the stroke colours
+    as described in the ‘Create An Icon’ here:
+        http://en.flossmanuals.net/make-your-own-sugar-activities/package-the-activity/
+ 4. Execute the following commands in a terminal open in the
+    Exercise20.activity/ directory. They will add the relevant files to git:
+        git init
+        git status
+        git add .gitignore exercise20.py setup.py images/logonew2.png
+        git add activity/activity.info
+        git add activity/activity.svg
+        git status
+        git commit
+    They create a new git repository in the current directory, check its
+    status, add the required files to the repository, check its status again
+    to ensure we don’t commit anything we don’t mean to, then commit the new
+    files and changes to the repository.
+
+    The .gitignore file is a special file which lists files that git shouldn’t
+    allow you to add to the repository, and which will be hidden from the
+    output of `git status`.
+ 5. Run ‘./setup.py dist_xo’ to build an XO bundle.
+ 6. Copy the dist/Exercise20-1.xo file to a USB stick and install it on a
+    physical XO laptop.
+"""
+
+from gi.repository import Gtk
+from sugar3.activity import activity, widgets
+from sugar3.graphics.toolbarbox import ToolbarBox
+import os
+
+
+class Exercise20Activity(activity.Activity):
+    """A simple window which displays a static image."""
+    def __init__(self, handle):
+        super(Exercise20Activity, self).__init__(handle)
+
+        # Create the standard activity toolbox.
+        toolbar_box = ToolbarBox()
+        self.set_toolbar_box(toolbar_box)
+        toolbar_box.show()
+
+        main_toolbar = toolbar_box.toolbar
+
+        activity_toolbar_button = widgets.ActivityToolbarButton(self)
+        main_toolbar.insert(activity_toolbar_button, 0)
+        activity_toolbar_button.show()
+
+        stop_button = widgets.StopButton(self)
+        stop_button.show()
+        main_toolbar.insert(stop_button, -1)
+
+        # Add an image to the window.
+        box = Gtk.Box()
+        box.show()
+        self.set_canvas(box)
+
+        image = Gtk.Image()
+        filename = os.path.join(os.path.dirname(__file__),
+                                'images', 'logonew2.png')
+        image.set_from_file(filename)
+        image.show()
+        box.pack_start(image, True, True, 8)