How to do drag and drop with different view types?

[kokilaw]

I need to implement the drag and drop for items with different view types. I tried with following code

override fun onMove(recyclerView: RecyclerView, source: RecyclerView.ViewHolder, target: RecyclerView.ViewHolder): Boolean {
        // Notify the adapter of the move
        mAdapter.onItemMove(source.adapterPosition, target.adapterPosition)
        return true
}

without

if (source.itemViewType != target.itemViewType) {
            return false
}

but it doesn't work as I expected. I'm using a grid layout by the way.

[safakesberk]

Did you change getItemViewType, onCreateViewHolder and onBindViewHolder methods in your adapter class?

[kokilaw]

Yes. RecylerView is working fine with different view types. Drag and drop between different view types is the place that that I'm stuck at.

[AndroidDeveloperLB]

To decide if a viewHolder should be drag-able and/or swipe-able, I think you need to do it in the getMovementFlags function. There you have a change to decide if you want to allow drag and/or swipe for the given ViewHolder.

To decide if a viewHolder can be switched with another one, you have onMove .
Here, made a sample for this :
https://github.com/AndroidDeveloperLB/RecyclerViewDragAndDropTest

Weird thing is that the animation might be weird in some cases. Reported it here:
https://issuetracker.google.com/issues/138465468