Android项目的Gen文件夹为空

Question

I'm starting to learn Android in Eclipse. But every time I try to create a project the gen folder is empty. So I don't get the R file(or whatever else is in that folder, if anything). Clean does NOT work. There was never an R to begin with. Do I need to download something to make it generate it?

Answer 1

had the same problem. Check in the Android sdk manager, tools and check if you have installed android sdk build-tools. had the same problem because i hadn't installed it.

Answer 2

None of the solutions posted here worked for me: Clean, changing options, build errors, etc. The problem was caused by importing the Android project as a normal project, ie using:

Import > General > Existing Projects Into Workspace

instead of using

Import > Android > Existing Android Code Into Workspace

Answer 3

I had this problem because I had two projects in the same folder and one was the library of the other. Then Eclipse built the projects in the wrong order. What I did to fix this was close the non-library project and then open it again (after the built of the library project), which made it work.

Answer 4

One of those

1. Getting rid of 'import android.R' line.
2. Cleaning the project and then building it again.
3. Closing project and then opening it again.

may help.

Answer 5

可能是您的问题与不正确的目标构建设置有关。例如，如果您在布局中使用了更多Android目标中可用的元素。您可以在此处查看更多详细信息。

Answer 6

STRUGGLING FROM THIS BUG FROM LAST TWO DAYS. FINALLY SOLVED IT :)

The best way to get rid of this is to go to WINDOWS option on the tool bar -> ANDROID SDK MANAGER -> and tick TOOLS option on the top tools bar (ie all all android sdk tools , android sdk platform tools , android sdk build-tools.) and install.

After updating all these too latest versions , go to HELP and hit CHECK FOR UPDATES and install all these new version plugins.

Last step is to go to PROJECT option in the tool bar and uncheck the BUILT AUTOMATICALLY option and go to CLEAN and perform clean on required or on all projects.

I know this method might consume some of your net mb's but will definitely solve your problem.

E.njoy...:)

Answer 7

I ran into the same problem. I had incorrectly set the path of the Android SDK. Setting the path in Windows -> Preferences -> Android did the trick for me.

Answer 8

I had the same problem. Just add these two line in your project.properties file

 target=android-19
 android.library.reference.1=../appcompat_v7

Answer 9

我碰巧遇到了同样的问题，通过“右键单击您的项目，然后单击构建项目”解决了这个问题。

Answer 10

Try this,

Right click your project

Select properties.

Select Java Build Path

Click add Folder

Select the gen folder

Click OK.