Book on Android testing

Oh, those were the days, when Android was pre-1.0! Documentation and training material was scarce, platform sources were not yet released, no device in sight. It was then when Diego Torres Milano first published a post about unit testing on Android. 3 short years later Android is the dominant smartphone platform but there has been no book dedicated to Android testing. Who else could have written that book than Diego?

Android Application Testing Guide from Packt Publishing

Let's start with a disclaimer: I was a reviewer of this book. I almost met Diego once when we both presented at Droidcon London 2009 but I had to leave early and we didn't. Believe or not, at the end of 2009 Android enthusiasts could still fit into a medium-sized presentation hall.

The book starts with a general introduction on testing then it starts to focus on Android testing. Android has JUnit integrated but the Android-specific classes are not over-documented. The Android test case classes are explained one by one with examples then we learn, how the principles of Test Driven Development can be applied to our Android projects. The second half of the book deals with useful techniques like automatic test execution, ways of performance and coverage testing and different tools for Behaviour Driven Development and Continuous Integration.

All in all, there is plenty of information in this book that is difficult to find or figure out. I can warmly recommend this book to everyone who builds production-quality software for the Android platform.

Book on Android UI development

Packt Publishing has just released this book about Android User Interface Development from Jason Morris and I got a mail from them whether I could write something about the book in this blog. Why not, responded I and there came an e-book. Of course, I had a hidden agenda too. I am aesthetically challenged, so to say and therefore UI design is not really my strength. I intended to learn from a master.

First and foremost, as the subtitle says, this book is for beginners and the author takes this mission seriously. The book follows a rigorous, step-by-step methodology. The reader is expected to start from an empty project and extend it line by line while the book explains, what is going on. It is best to demonstrate with an excerpt:

1. Start by creating an empty Button element below our answers ViewGroup LinearLayout (but still within the root LinearLayout element). Assign itthe ID skip, so that we can reference it in Java:
   android:id="@+id/skip"
2. Create some padding between the answers and the new button by using a margin:
   android:layout_marginTop="12sp"
3. Give it the display label Skip Question:
   android:text="Skip Question"
4. Like all of the previous widgets, the width should be fill_parent and the height should be wrap_content: android:layout_width="fill_parent" android:layout_height="wrap_content"

And so on, and so on. There are books and trainings that call themselves hands-on but this book works really the best if you type the code while you are reading. Using this style, the book gets surprisingly far, starting from the simplest Hello, World type of applications it discusses lists and their relations to data, widgets (even the most exotic ones), layouts, including custom layouts and finally animations. Meanwhile it never gives up its practical approach, e.g. it teaches you, how to create images with transparent backgrounds with Gimp. I really appreciated that bit because I know from my own experience that this detail can be hard to figure out.

The author made some decisions that I found a bit strange. First and foremost, even though the title is Android User Interface Development, it does not discuss 2D (Canvas and co.) and 3D (OpenGL) at all. I am sure that some readers will miss these parts. I am big fan of command-line development environments but maybe Eclipse is better for beginners.

All in all, I enjoyed this book and I even learnt from it. The book does not cover all the aspects of Android development but it addresses a very important application type. It is a good place to start with Android development.

Another book: Android Wireless Application Development

Somebody contacted me by LinkedIn whether I would write a review about this book from Addison-Wesley. Why not, replied I, if I get the book to read and it is understood that I am not a professional reviewer. I got the book, read it and here are my subjective impressions.


Gee, there are SO MANY THINGS in Android - that was the lingering feeling after having read the book. Because the authors' strong intention is not to make compromises. They methodically go through every feature of the Android API, including 1.5 features. Have you heard about AppWidgets before? Or LiveFolders? I admit that I have not but now I know about them because the book mentioned it.

The enormous breadth of the discussion comes with a cost, however. Even though everything (or almost everything) is mentioned, very few topics are discussed in depth. For example I checked the most popular topics of this blog - unit tests, adapters. The Android unit testing framework is discussed as a bulleted list (no code examples) and the ArrayAdapter example uses Strings as backing data which causes so many problems for developers. I even managed to find the topic of hybrid applications (mashup of web technologies and Android applications, like the JavaScript handlers that an Android app can implement) that was not discussed at all (go to the lean Hello, Android book if you are interested, how this very fashionable approach works in Android).

It is best to handle this book as an inventory of Android features and as such, it is very valuable. Such an inventory takes 573 pages, as of version 1.5. I wonder what that number will be in 3 years time.