android Annotation Syntax

Question

I know this is stupid question But

I have never used android Annotation, it just appeared with auto-complete in android studio and I thought its a good idea to use it, I'm I right?

I did my research and I learned how to use it with parameters but I didn't find anything about how to use it with pair and generic

here is my code

private Pair<StringRes ,DrawableRes> getRespectiveStingAndDrawableRes(String permission) {
        if(permission.equals(Manifest.permission.WRITE_EXTERNAL_STORAGE))
            return Pair.create(R.string.WRITE_EXTERNAL_STORAGE_permision_message,R.drawable.ic_menu_gallery);
        return null;
    }

and this error appeared

Error:(49, 31) error: incompatible types
required: Pair<StringRes,DrawableRes>
found:    Pair<Integer,Integer>

i tried to use IntegerRes but also not worked

note: the piar I used is android.support.v4.util.Pair

Answer 1

You cannot use these annotations that way. They are mainly used to limit parameter values to a given type, e.g. @StringRes requires that the specified int value is a valid string resource.

For this Pair you still have to write Integer, since that is the actual variable type:

private Pair<Integer, Integer> getRespectiveStingAndDrawableRes(String permission) {
    ...
}