[android-developers] What is different between @+id/android:list and @id/android:list ??

Hello Everyone ~

I've develop android application, and one question.

As you know, When we use LiveActivity, we must specify @id/
android:list for ListView ID.

But, When I use @+id/android:list instead of @id/android:list, it is
working fine.

What is different between @+id/android:list and @id/android:list ??

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