This tutorial will show first how to create a RadioGroup listener and, second, how to identify specific buttons when you can't access them through a resource id. Anonymous radio buttons (and other views) will normally occur when you create them dynamically from a database or some other resource. I couldn't find a good tutorial on setting up a radio group when I was working on it myself, so I thought I would share what I've learned. This tutorial assumes that you know the basics of setting up activities and views. ... more

This library is a Java implementation of the graph datastructures and algorithms presented in Cormen, Leiserson, Rivest and Stein, Introduction to Algorithms, 3rd ed.(CLRS). I have also used some ideas from Robert Sedgewick's graph algorithms books (in C as well as in Java) and a few other sources. I started developing the library late last fall while working through the graph theoretical portion of CLRS. To begin with, I just found it helpful for getting a solid grasp of the material in the book. But then I also discovered that Java has no standard support for graphs (although there are several unofficial graph libraries for Java easily found by googling). Boost, by way of contrast, does provide C++ support for graphs. Since I intend to continue the study of graph theory both from a mathematical ... more

The technique I'll present here allows you to create a custom view entirely in Java, then embed that view into an XML layout. While there are already numerous tutorials for creating custom views both on the web and in the literature, I couldn't find anything that explained what is actually essential in this particular kind of configuration. So, I had to piece it together from tutorials that explained something kind of similar but still not quite the same and then the usual trial and error. ... more