海报复印的解决方案进入了答案部分，以从未答复的过滤器去除这样的：

Copying poster's solution into the answer section, in order to remove this from the "Unanswered" filter:

这是不符合我的code的一个问题，但与Eclipse和Android   SDK。在Eclipse - 经过一番研究，我做了>检查更新帮助   和一切工作了。

It wasn't a problem with my code, but with Eclipse and the Android SDK. After some research, I did "Help -> Check for updates" in Eclipse and everything is working now.