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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"
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