If you ever get weird syntax errors in R.java file, check this issue

Question

If you ever get weird syntax errors in R.java file, check this issue

Perhaps this will help someone avoid the pain.

When doing some work with the GUI, I got a typical identifier that cannot be resolved. (Reed, I call it).
"No problem, I just check my xml files," but I could not find any problems (no hints in the console).

But I noticed further in the list of errors some dumb syntax errors in R.java, such as ...

Invalid modifier for an array of classes; only public, abstract and final are allowed

So, I realized that something must be broken in the code that generates it. The beginning of my R.java file looked like this:

public final class R {
    public static final class  {
        public static final int VertBar=0x7f0a0000;
    }
    public static final class array {
        public static final int AnswerActionValues=0x7f060001;
        public static final int AnswerActionsNames=0x7f060000;
    }

? , VertBar.

, ...

<View
android:id="@+/VertBar"
android:layout_centerHorizontal="true"
android:layout_height="fill_parent"
android:layout_width="20dp"
android:background="#FFFFFFFF"></View>