Sobes.tech
Junior — Middle

How can you create a list containing ten different elements or types of cells?

sobes.tech AI

Answer from AI

To create a list with ten different elements or cell types in Android, RecyclerView with multiple ViewHolder types is usually used.

Main steps:

  1. Override the getItemViewType(int position) method in the adapter, returning a unique type for each element.
  2. In onCreateViewHolder, create different ViewHolders depending on the type.
  3. In onBindViewHolder, populate data according to the ViewHolder type.

Example:

class MultiTypeAdapter(private val items: List<Item>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
    override fun getItemViewType(position: Int): Int {
        return items[position].type // type from 0 to 9
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        return when(viewType) {
            0 -> Type0ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_type0, parent, false))
            1 -> Type1ViewHolder(LayoutInflater.from(parent.context).inflate(R.layout.item_type1, parent, false))
            // ... up to 9
            else -> throw IllegalArgumentException("Unknown view type")
        }
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        when(holder) {
            is Type0ViewHolder -> holder.bind(items[position])
            is Type1ViewHolder -> holder.bind(items[position])
            // ...
        }
    }

    override fun getItemCount() = items.size
}

This way, you can flexibly display different cell types in a single list.