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Alternative method for providing R ids with Android 4 #20
Description
In Android 4, the fields of the R inner classes won't be final anymore for library projects (and only for library projects).
This means that those ids cannot be used for switches any more (and we don't really care), but also cannot be use into annotations. That's a problem for us, because the compiler won't allow this any more :
@ViewById(R.id.myIdFromMyLibraryProject)
So I think we'll have to provide an alternative way to specify ids, using strings and complete qualified names :
@ViewById(alt="com.mylibrary.R.id.myIdFromMyLibraryProject")
This is not perfect (not typesafe any more). Ids may become invalid and you won't notice. We can help with our compile time framework, because when can check that the "com.mylibrary.R.id.myIdFromMyLibraryProject" field exists, and issue a compile error otherwise. Runtime frameworks won't be that lucky (RoboGuice, ACRA...).
The Android team introduced this change to improve the build perfs when using library projects. More on this subject :
http://tools.android.com/tips/non-constant-fields
https://plus.google.com/u/0/109385828142935151413/posts
http://code.google.com/p/acra/issues/detail?id=85
Activity
pyricau commentedon Feb 2, 2012
Well in fact we should be able to find the R class, so we could probably do this :
@ViewById(alt="myIdFromMyLibraryProject")@EActivity(alt="myLayout")naixx commentedon Jun 15, 2012
Should be very useful. Vote +
pyricau commentedon Jun 21, 2012
Quoting myself in #78 :
I don't know why I wanted to use negative ids. There's no point doing that, we can use the real ids anyway.
pyricau commentedon Jun 21, 2012
Hum. We in fact cannot do that. I just tried, spent some time implementing it and.. the problem is that when doing a full build, the
R_class is removed, and therefore the annotation value cannot be found, leading to ajava.lang.reflect.InvocationTargetException.We'll have to fallback to String attributes.
pyricau commentedon Jun 21, 2012
I'm on it... this is going to be a mega commit :)
Introducing a new resName parameter in annotations to add library sup…
pyricau commentedon Jun 25, 2012
Documentation available