刪除了gen文件夾，eclipse現在不生成它:(

Question

我不小心刪除了我的gen文件夾，現在，可以預見，我的資源都搞砸了，我只是自己創建了一個gen文件夾，並試圖項目>乾淨 - 沒有工作，嘗試右鍵單擊項目，並去Android工具>修復項目屬性 - 沒有工作。試圖不檢查生成自動...沒有工作。清理，關閉項目，關閉日食，重新啓動等等。沒有什麼工作，我不斷看到此錯誤：gen already exists but is not a source folder. Convert to a source folder or rename it.

編輯 - 確定能夠產生R.java，但現在我越來越瘋狂的東西在控制檯：

[2011-06-14 17:06:11 - fastapp] Conversion to Dalvik format failed with error 1 [2011-06-14 17:06:42 - fastapp] Dx trouble processing "java/awt/font/NumericShaper.class":

Ill-advised or mistaken usage of a core class (java.* or javax.*) 
when not building a core library. 

This is often due to inadvertently including a core library file 
in your application's project, when using an IDE (such as 
Eclipse). If you are sure you're not intentionally defining a 
core class, then this is the most likely explanation of what's 
going on. 

However, you might actually be trying to define a class in a core 
namespace, the source of which you may have taken, for example, 
from a non-Android virtual machine project. This will most 
assuredly not work. At a minimum, it jeopardizes the 
compatibility of your app with future versions of the platform. 
It is also often of questionable legality. 

If you really intend to build a core library -- which is only 
appropriate as part of creating a full virtual machine 
distribution, as opposed to compiling an application -- then use 
the "--core-library" option to suppress this error message. 

If you go ahead and use "--core-library" but are in fact 
building an application, then be forewarned that your application 
will still fail to build or run, at some point. Please be 
prepared for angry customers who find, for example, that your 
application ceases to function once they upgrade their operating 
system. You will be to blame for this problem. 

If you are legitimately using some code that happens to be in a 
core package, then the easiest safe alternative you have is to 
repackage that code. That is, move the classes in question into 
your own package namespace. This means that they will never be in 
conflict with core system classes. JarJar is a tool that may help 
you in this endeavor. If you find that you cannot do this, then 
that is an indication that the path you are on will ultimately 
lead to pain, suffering, grief, and lamentation. 

[2011-06-14 17:06:42 - fastapp] Dx 1 error; aborting 
[2011-06-14 17:06:42 - fastapp] Conversion to Dalvik format failed with error 1 

And eclipse can't resolve the import of my resources import com.me.fastapp.R;

Answer 1

1. 右鍵點擊您的項目
2. 選擇屬性。
3. 選擇Java Build Path
4. 單擊Add Folder
5. 選擇根文件夾
6. 單擊確定。

Answer 2

準備R類可能存在問題（例如，由於某些佈局xml中的錯誤）。將構建器輸出從Preferences中轉到「verbose」，並在控制檯中查看代中斷的位置。

Answer 3

我不知道這是否可以作爲答案，但我最終拋出了手，只是恢復到我最後一次提交。

Answer 4

我將SDK升級到v22並將ADT升級到更新版本後，今天發生了同樣的問題。顯然，我的SDK管理器沒有檢測到SDK Platform-Tools和新引入的SDK Build-tools也發生了變化，所以它沒有升級工具，導致我的SDK/ADT包不能生成/ gen文件夾的內容蝕。

升級SDK和ADT後，我不得不回到SDK管理器，因此它會爲我提供安裝/更新SDK Platform-tools的選項（從17開始）和SDK Build-tools（也包括17 ）。