CODEWITHSUNDEEP
androidkotlinandroid-listview
user19576538
user19576538

Reputation:

How to get the selected CardView in a ListView?

I have a ListView of CardViews. As you can see in the picture below, my cards have a vertical ImageView on the edge with gray default background. I want to change the color of that ImageView's background dynamically based on if the item is currently selected or not. I'm using ViewBinding, so, the reference to my ImageView would be binding.hightlightView.

This is the code for my adapter:


class SectionListAdapter(private val onItemClicked: (Section) -> Unit) :
    ListAdapter<Section, SectionListAdapter.SectionViewHolder>(DiffCallback()) {

    private lateinit var binding: SectionItemViewBinding
    private lateinit var parentBinding: FragmentSectionBinding

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): SectionViewHolder {
        val layoutInflater = LayoutInflater.from(parent.context)
        binding = SectionItemViewBinding.inflate(layoutInflater, parent, false)
        parentBinding = FragmentSectionBinding.inflate(layoutInflater)
        return SectionViewHolder(binding)

    }
    
    override fun onBindViewHolder(holder: SectionViewHolder, position: Int) {
        val currentItem = getItem(position)
        holder.itemView.setOnClickListener {
            onItemClicked(currentItem)
        }
        holder.bind(currentItem)
    }

    class SectionViewHolder(private val binding: SectionItemViewBinding) :
        RecyclerView.ViewHolder(binding.root) {
        fun bind(item: Section) {
            binding.apply {
                sectionItemTitle.text = item.name
                generalPriceValue.text = item.priceNationalCard.toString()
                membersPriceValue.text = item.priceMembershipCard.toString()
            }
        }
    }

    class DiffCallback : DiffUtil.ItemCallback<Section>() {
        override fun areItemsTheSame(oldItem: Section, newItem: Section): Boolean {
            return newItem.id == oldItem.id
        }

        override fun areContentsTheSame(oldItem: Section, newItem: Section): Boolean {
            return newItem == oldItem
        }
    }

}

Upvotes: 0

Views: 60

Answers (1)

triay0
triay0

Reputation: 141

You can update the section object with the onItemClicked listener with a flag like selected and update the adapter again with notifyDataSetChanged. Then in your binding look for this flag to select or deselect the item.

Upvotes: 0

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