bed0f23940
When contextual cards are being laid out, there are two separate layout transitions, which brings users the feeling of slowness. In the current design, we bind slices in the adapter's onBindViewHolder(), where slice's binding is acutally done in the background thread and it's time consuming. So before getting the callback from the slice framework to have actual contents, the view is empty but the viewholder is already created. So the RecyclerView would treat it as completed and starts to lay them out. This introduces the first time transition. Once we get the actual slice content, the view will be refreshed and laid out, which is the second time transition. To tackle this, this CL caches slices that are created at pre-check time, and use them to render before getting updated slices to fill up the gap. Fixes: 156372414 Test: robotest and launch settings to see the transition being smooth. Change-Id: Ic0a27ff36f1824de499b75ec73b2635de9cbe6b5