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What does this mean
@[+][package:]type:name
or this
@+id/my_id
?
What plus does? No detailed explanation in apidoc http://developer.android.com/reference/android/R.attr.html#id
You can use the id of an element from other packages. That’s how themes and other variable content works. They take resource from other packages.
The plus symbol, +, indicates that this is a new resource ID and the aapt tool will create a new resource integer in the R.java class, if it doesn’t already exist.
Refer:
http://developer.android.com/guide/topics/resources/layout-resource.html#idvalue