Base class Model - mayurparmar2/AlarmDemo GitHub Wiki

// 1. Define a Base Data Class

sealed class MediaItem(
    open val id: String,
    open val name: String,
    open val path: String,
    open val dateAdded: Long,
    open val size: Long
)
// 2. Define Child Data Classes

data class PhotoItem(
    override val id: String,
    override val name: String,
    override val path: String,
    override val dateAdded: Long,
    override val size: Long,
    val resolution: String // Additional property specific to photos
) : MediaItem(id, name, path, dateAdded, size)

data class VideoItem(
    override val id: String,
    override val name: String,
    override val path: String,
    override val dateAdded: Long,
    override val size: Long,
    val duration: Long // Additional property specific to videos
) : MediaItem(id, name, path, dateAdded, size)

//3. Create a Utility Function to Load Data

class MediaRepository {

    fun fetchMediaItems(): List<MediaItem> {
        val photo = PhotoItem(
            id = "1",
            name = "Photo1",
            path = "/storage/photos/photo1.jpg",
            dateAdded = System.currentTimeMillis(),
            size = 2048,
            resolution = "1080x720"
        )

        val video = VideoItem(
            id = "2",
            name = "Video1",
            path = "/storage/videos/video1.mp4",
            dateAdded = System.currentTimeMillis(),
            size = 4096,
            duration = 60000 // Duration in milliseconds
        )

        return listOf(photo, video)
    }
}

// 4. Use in RecyclerView

class MediaAdapter(private val items: List<MediaItem>) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {

    companion object {
        private const val TYPE_PHOTO = 1
        private const val TYPE_VIDEO = 2
    }

    override fun getItemViewType(position: Int): Int {
        return when (items[position]) {
            is PhotoItem -> TYPE_PHOTO
            is VideoItem -> TYPE_VIDEO
        }
    }

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
        val inflater = LayoutInflater.from(parent.context)
        return when (viewType) {
            TYPE_PHOTO -> PhotoViewHolder(inflater.inflate(R.layout.item_photo, parent, false))
            TYPE_VIDEO -> VideoViewHolder(inflater.inflate(R.layout.item_video, parent, false))
            else -> throw IllegalArgumentException("Invalid view type")
        }
    }

    override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
        when (holder) {
            is PhotoViewHolder -> holder.bind(items[position] as PhotoItem)
            is VideoViewHolder -> holder.bind(items[position] as VideoItem)
        }
    }

    override fun getItemCount() = items.size

    class PhotoViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        fun bind(photo: PhotoItem) {
            // Bind photo data
        }
    }

    class VideoViewHolder(view: View) : RecyclerView.ViewHolder(view) {
        fun bind(video: VideoItem) {
            // Bind video data
        }
    }
}