libGDX IntelliJ IDEA无法访问com.badlogic.gdx.Application

我用libGDX setup ui创建了一个项目.该项目在Eclipse中运行良好但是当我在Android Studio中导入它时,android项目MainActivity.java抛出了4个异常:

java: cannot access com.badlogic.gdx.Application
class file for com.badlogic.gdx.Application not found

java: cannot find symbol
symbol:   variable super
location: class com.vestrel00.nekko.MainActivity

java: cannot find symbol
symbol:   method initialize(com.vestrel00.nekko.KFNekko,com.badlogic.gdx.backends.android.AndroidApplicationConfiguration)
location: class com.vestrel00.nekko.MainActivity

java: method does not override or implement a method from a supertype

有没有人有办法解决吗？