[Android] R.layout.main 找不到的問題

在Eclipse編譯第一個Android程式的時候報出這樣的錯誤：

setContentView(R.layout.main);  出錯。

找不到main。

原因及解決方案：

http://stackoverflow.com/questions/6002756/setcontentviewr-layout-main-error
If you fix imports before R.java has been generated for your project (before building it the first time) it will add the line:
import android.R;
which will override the local R.java that you are trying to reference.
Deleting that line resolved the errors for me.
就是把import android.R:刪了就好了。
有import android.R時，從Android的資源類裡去找。要注意喔，如果有這個，會找不到你定義的控制項ID