RecyclerView and SwipeRefreshLayout

Question

I\'m using the new RecyclerView-Layout in a SwipeRefreshLayout and experienced a strange behaviour. When scrolling the list back to the top sometim

Answer 1

Before you use this solution: RecyclerView is not complete yet, TRY NOT TO USE IT IN PRODUCTION UNLESS YOU'RE LIKE ME!

As for November 2014, there are still bugs in RecyclerView that would cause canScrollVertically to return false prematurely. This solution will resolve all scrolling problems.

The drop in solution:

public class FixedRecyclerView extends RecyclerView {
    public FixedRecyclerView(Context context) {
        super(context);
    }

    public FixedRecyclerView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    public FixedRecyclerView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    @Override
    public boolean canScrollVertically(int direction) {
        // check if scrolling up
        if (direction < 1) {
            boolean original = super.canScrollVertically(direction);
            return !original && getChildAt(0) != null && getChildAt(0).getTop() < 0 || original;
        }
        return super.canScrollVertically(direction);

    }
}

You don't even need to replace RecyclerView in your code with FixedRecyclerView, replacing the XML tag would be sufficient! (The ensures that when RecyclerView is complete, the transition would be quick and simple)

Explanation:

Basically, canScrollVertically(boolean) returns false too early,so we check if the RecyclerView is scrolled all the way to the top of the first view (where the first child's top would be 0) and then return.

EDIT: And if you don't want to extend RecyclerView for some reason, you can extend SwipeRefreshLayout and override the canChildScrollUp() method and put the checking logic in there.

EDIT2: RecyclerView has been released and so far there's no need to use this fix.