在Eclipse ADT中创建android项目后，出现大量错误

Question

I'm using eclipse ADT (most recent version) to develop some android apps. I've followed the getting started tutorial at the dev.android.com and it worked just fine.

But when i tried to create another project with the same targets and sdk's, i've got nothing but errors:

Some errors and my sdk's:

That's the same sdk's i used before these errors started showing up. What can be causing this?

EDIT: my project won't generate the R.java file

Answer 1

You might need to add a support library to your new project.

Check this link for downloading the support libraries -

http://developer.android.com/tools/support-library/setup.html#download

Please notice that you need to import them into your eclipse and then include one (preferably the newest, not sure about this) in your project.

EDIT: Before downloading the support libraries you should first check if you have them already. Try this, right click project folder in the eclipse package explorer, Properties>Android>Library>Add> select a library if you have one . There might be an invalid library included in your project already, if that happens then you will see it in the Library>Add> menu, remove it and add a new one.

Answer 2

You might have clean your project ........ if yes. ....you must check whether R.java file is present in **Project(your project)->gen->package name->R.java**

if not than u have to update Tool Folder in SDK manager