unable to open class file ..\..\R.java Permission denied

1# unable to open class file ..\..\R.java Permission denied enied, unable, class 求助：我是新手，最近在照書學習時，匯入的程式都在項目的表徵圖處有個紅叉， 提示：ERROR:Unable to open class file ..\..\R.java Permission denied 請問這種情況是什麼導致的 ？

2# 發表於 2010-10-5 16:51  Help with “Error: Unable to open class file R.java” when building an Android App for the first time in Eclipse This is just a really, quick and dirty post to help resolve this issue. Problem: You’ve just installed Eclipse (5.2.x at the time of this writing), and attempted to create your first Android Application.  When clicking create, you see an error similar to this: Error: Unable to open class file R.java Solution: The “Build Path” for your Java environment is not setup correctly in Eclipse.  To fix this, follow these steps: 1) Open the Preferences Window by clicking Window -> Preferences 2) Find the Java section and expand it 3) Select Build Path 4) Change the value of Source and output folder from Folders to Project 5) Click Apply and then OK Your problem should be resolved!