title: Why can't I use the string ID android.R.string.share?
body: <p>It's right there in values/strings.xml in Android's source - why isn't it in android.R?</p>
  
  <p><strong>edit</strong>: I am referring to Android's built in string resources (<code>android.R.string.…</code>) and not my own project's resources - so, for example, while I can use <code>android.R.string.cancel</code>, I can't use <code>android.R.string.share</code> despite the fact that the two of them are declared in the same file in Android's source code</p>