@+id/和android:id有什么区别？

android:id和@id一样是引用已有的id，

@+id是新增加一个id

 

在Dev Guide -> User interface -> Declaring Layout 里面看到的。
    The at-symbol (@) at the beginning of the string indicates that the XML parser should parse and expand the rest of the ID string and identify it as an ID resource. The plus-symbol (+) means that this is a new resource name that must be created and added to our resources (in the R.java file). There are a number of other ID resources that are offered by the Android framework. When referencing an Android resource ID, you do not need the plus-symbol, but must add the android package namespace, like so:
android:id="@android:id/empty"