Apps Understanding xml properties

[mvmd]

So I'm obviously new to developing for droid, as well as Java, and as I'm following along through tutorials I see in the xml for a textview for example:

android:id="@+id/label"

What I'm wondering about, is there a specific reason there's a '+' infront of id?

 

[miXer]

The + is there to add the id to the auto generated R file. If you take the + away, you would have to manually go into the auto generated file(you hear it sounds bad) and add it yourself.

 

[AndroidLab]

@+id means that you are creating this ID, @id means that you're invoking and id that already exists.

 

[mvmd]

Makes sense, thanks.