title: Adding a library/JAR to an Eclipse Android project
body: <p>This is a two-part question about adding a third-party library (JAR) to an Android project in Eclipse.</p>
  
  <p>The first part of the question is, when I try to add a third-party JAR (library) to my Android project I first get the problem of</p>
  
  <blockquote>
    <p>Error parsing XML: unbound prefix</p>
  </blockquote>
  
  <p>because I'm trying to use a class from that JAR (and need the prefix somehow defined). What's going on?</p>
  
  <p>Second, (after fixing that--the answer is given below), my application doesn't work on Android and I discover via the debugger (LogCat) that the class I'm attempting to consume doesn't exist.</p>
  
  <blockquote>
    <p>Caused by:
    java.lang.ClassNotFoundException:
    com.github.droidfu.widgets.WebImageView...</p>
  </blockquote>
  
  <p>Why, when I get no compilation or linker error in Eclipse, does it have this problem on the emulator?</p>
  
  <p>These two questions are rhetorical for I'm going to answer them myself below. Other posts in this forum creep up to the problem and elsewhere there is discussion, but I feel that I can be more explicitly helpful for the next guy to come along.</p>