Download link address?
a quick Google search would have given you the result http://www.appinventor.org/book2
Taifun
Trying to push the limits! Snippets, Tutorials and Extensions from Pura Vida Apps by 
Taifun.
Images used in the source code of this book.
download link?
there is a clue here:
Not the source code, but the pictures used in the source code.
The cat in the picture, the mole.
Where can I download the pictures used in the source code?
The resources for the book are located as indicated in bold typeface below.
Here are some resources to help you learn to use the AI2 tools. A very good way to learn App Inventor is to read the free Inventor's Manual here in the AI2 free online eBook http://www.appinventor.org/book2 ... the links are at the bottom of the Web page. The book 'teaches' users how to program with AI2 blocks.
There is a free programming course here http://www.appinventor.org/content/CourseInABox/Intro and the aia files and images for the projects in the book are here: http://www.appinventor.org/bookFiles
How to do a lot of basic things with App Inventor are described here: http://www.appinventor.org/content/howDoYou/eventHandling .
Also look here http://kio4.com/appinventor/index.htm and here http://www.imagnity.com/tutorial-index/ for more tutorials.
Learn about components http://ai2.appinventor.mit.edu/reference/components/
and visit the Library http://appinventor.mit.edu/explore/library Help>Library on the MENU
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http://ai2.appinventor.mit.edu/reference/components/
http://ai2.appinventor.mit.edu/reference/components/userinterface.html
在上方连接这些组件。
为每个组件编写一个简单的程序以说明该组件的用法。
有这样的网站吗？