FAB doesn't reappear when using RecyclerView's swipe functionality

[manvis]

Since the release of a recent update, RecyclerView natively supports swipe functionality (e.g. swipe to delete) with the help of ItemTouchHelper. It's set up like this:

ItemTouchHelper.SimpleCallback simpleItemTouchCallback =
        new ItemTouchHelper
                .SimpleCallback(0, ItemTouchHelper.LEFT | ItemTouchHelper.RIGHT) {
    @Override
    public boolean onMove(RecyclerView recyclerView, RecyclerView.ViewHolder viewHolder,
                          RecyclerView.ViewHolder viewHolder1) {
        return false;
    }

    @Override
    public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
        getActivity().getContentResolver()
                .delete(Uri.withAppendedPath(AppContentProvider.CONTENT_URI,
                        String.valueOf(viewHolder.getItemId())), null, null);
    }
};
ItemTouchHelper itemTouchHelper = new ItemTouchHelper(simpleItemTouchCallback);
itemTouchHelper.attachToRecyclerView(recyclerView);

Unfortunately, if FAB is hidden and rows are swiped away to the point when scroll bar disappears, it becomes impossible to recover it without switching orientation or restarting the app.

[dekaru]

You could always use fab.show() method to restore the button's visibility after a finished swippe.