转到项目并点击 / code>。这应该会重新生成你的R.java文件。

Go to Project and hit Clean. This should, among others, regenerate your R.java file.

还可以删除任何 import android.R。* 语句，然后做清理我提到的。

Also get rid of any import android.R.* statements and then do the clean up I mentioned.

显然Jonas问题与不正确的目标构建设置有关。他的目标版本设置为Android 2.1（SDK v7），其中他的布局XML使用Android 2.2（SDK v8）元素（布局参数 match_parent ），由于这个原因，Eclipse无法正确生成导致所有问题的R.java文件。

Apparently Jonas problem was related to incorrect target build settings. His target build was set to Android 2.1 (SDK v7) where his layout XML used Android 2.2 (SDK v8) elements (layout parameter match_parent), due to this there was no way for Eclipse to correctly generate the R.java file which caused all the problems.