Adapters

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ArticleAdapter

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Constructor Parameters

class ArticleAdapter(
    private val onItemClicked: (Article) -> Unit
)

• onItemClicked - Lambda invoked when article item is clicked, receives clicked Article

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Properties

• viewTypeItem: Int = 0 - View type constant for article items
• viewTypeLoading: Int = 1 - View type constant for loading indicator
• isLoading: Boolean = false - Current loading state for pagination

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Methods

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getItemViewType()

override fun getItemViewType(position: Int): Int

• Returns viewTypeItem for article positions
• Returns viewTypeLoading for loading indicator position

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getItemCount()

override fun getItemCount(): Int

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onCreateViewHolder()

override fun onCreateViewHolder(
    parent: ViewGroup,
    viewType: Int
): RecyclerView.ViewHolder

• viewTypeItem → Creates ArticleViewHolder with ItemArticleBinding
• viewTypeLoading → Creates LoadingViewHolder with ItemLoadingBinding

• parent - Parent ViewGroup
• viewType - View type constant

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onBindViewHolder()

override fun onBindViewHolder(
    holder: RecyclerView.ViewHolder,
    position: Int
)

• Only processes ArticleViewHolder instances
• Gets article at position from ListAdapter
• Calls bind() on holder
• Sets click listener to invoke onItemClicked lambda

• holder - ViewHolder to bind
• position - Item position in list

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setLoading()

fun setLoading(isLoading: Boolean)

• isLoading - true to show loading indicator, false to hide

• Returns early if state unchanged (prevents unnecessary updates)
• When true: Notifies insertion of loading item at end
• When false: Notifies removal of loading item

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ArticleViewHolder

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Constructor Parameters

class ArticleViewHolder(private val binding: ItemArticleBinding) :
    RecyclerView.ViewHolder(binding.root)

• binding - View binding for article item layout

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Methods

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bind()

fun bind(article: Article)

• article - Article data to display

1. Shows progress bar initially
2. Loads article image using Glide with:
   • Center crop transformation
   • RequestListener for load state
3. Hides progress bar on image load success/failure
4. Shows image view only on successful load
5. Sets formatted published date with string resource
6. Sets article title

• Uses Glide for efficient image loading and caching
• Implements RequestListener<Drawable> for load state callbacks:
  • onLoadFailed() - Returns false to allow Glide default error handling
  • onResourceReady() - Hides progress bar, shows image, returns false

• Uses toFormattedDate() extension function
• Formats with R.string.published_at string resource

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View Bindings

• progressBar - ProgressBar shown during image load
• imgArticle - ImageView for article image
• tvDate - TextView for formatted published date
• titleText - TextView for article title

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Dependencies

• centerCrop() - Image transformation
• Custom RequestListener for load state management

• Article.toFormattedDate() - Formats timestamp to readable date string