Request to add SmoothFlowLayoutManager

[tcqq]

@davideas Google's flexbox-layout has a issues, Hope the FlexibleAdapter can support the following effects.

[davideas]

@tcqq, which effect exactly? The multi-elements with different column size and rows? Isn't a capability of the LayoutManager you adopt (not the adapter)?

[tcqq]

@davideas Yes, this is a FlowLayout. It is a LayoutManager. Using Google's flexbox-layout will achieve this effect, but Google's inventory is in issues.

[davideas]

Designing and developing a LayoutManager is a huge and difficult activity. I might do it, but I don't want: too much time and research.

[tcqq]

@davideas If can fixed the #453 issue in flexbox-layout or fixed the #1 and #2 issues in FlowLayoutManager, FlexibleAdapter will be able to implement FlowLayout effect very quickly.