做了一个新鲜的Eclipse，JDK和Android的SDK的安装。

Did a fresh install of Eclipse, JDK and android-sdk.

我创建一个新的项目时，当前收到此错误

I am currently receiving this error when creating a new project

[2010-09-26 16点○七分56秒 - 测试]错误：无法打开类文件C：\工作区\测试\根\ COM \例如\测试\ R.java：没有这样的文件或目录

[2010-09-26 16:07:56 - Test] ERROR: Unable to open class file C:\workspace\Test\gen\com\example\test\R.java: No such file or directory

什么是这种情况的原因，以及如何解决呢？

What's the reason for this and how do I fix it?

Eclipse Helios 32 bit
java version "1.6.0_21"
Android sdk API 8

P.S。我是新来的Andr​​oid的发展。

P.S. I'm new to Android development.

编辑：我想大部分的解决方案，但毫无效果。于是我开始用我朋友的木卫三的Eclipse的安装。

I tried most of your solutions, but nothing worked. So I started using my friend's install of Eclipse Ganymede.

推荐答案

我有同样的问题，所有我需要做的，是创建项目，并重新启动Eclipse。

I have had same issue, all what I needed to do, was create project and restart eclipse.

//编辑：的完全崩溃的包树工程，以及

// Complete collapsing of "Package" tree works as well.