What is the “Ignoring InnerClasses attribute” warning output during compilation?

Question

I am new to Android and am using the Ical4j library for parsing ICS (Outlook calendar) files.

However, when I build my application in Eclipse, the follo

Answer 1

Update build tools and support libraries to the same version

Answer 2

I had the same error when using ksoap2 library.

To get rid of it I downloaded DJ Java Decompiler to decompile the .jar file to .java files. After that i compiled the .java files to a .jar file using eclipse.

Answer 3

If your app and your libraries have all been built with a new JDK (7+) and you are still getting this, then you can fix this problem by telling Proguard to keep the enclosing method attribute. Just add the following to your Proguard rules:

-keepattributes EnclosingMethod

Answer 4

This is quite common when including jar files. Although the warning isn't anything to worry about if you are just using the API normally, you should be able to get rid of them by compiling ical4j yourself from source within Eclipse (either build a new jar, or just drop the source into your own source folder). Though I should stress that unless you actually get problems, this isn't something to worry about.