Butterknife does not work with Include tag

Question

I have a CoordinatorLayout where I have my Button:

<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_gravity="bottom|end">

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="bottom|end"
        android:layout_marginBottom="16dp"
        android:layout_marginRight="16dp"
        android:src="@drawable/icon"
        app:fabSize="normal"/>

</android.support.design.widget.CoordinatorLayout>

And then I have the Activity xml where I include the Button:

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">

    ...

        <include
            android:id="@+id/fabHere"
            layout="@layout/fab_here"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>

</LinearLayout>

And here I have a fragment with Butterknife:

public class MyFragment extends Fragment {
....
@BindView(R.id.fab) FloatingActionButton fab;


    @Override
        public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
            view = inflater.inflate(R.layout.my_fragment, container, false);
            ButterKnife.bind(this, view);

            return view;
    }
...
 }

But if I start the App this appears:
java.lang.IllegalStateException: Required view 'fab' with ID 2131624072 for field 'fabHere' was not found. If this view is optional add '@Nullable' (fields) or '@Optional' (methods) annotation.

I tried to add the '@Nullable' and '@Optional' annotations, but it does not work

Answer 1

Simply remove the id from the include tag and the binding will work, even for the fields in the included layout.