在android中更改查看Pager2所选图片的图片查看背景

implementation 'androidx.viewpager2:viewpager2:1.0.0'

<androidx.viewpager2.widget.ViewPager2
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent" />

class ImageAdapter(private val images: List<Int>) : RecyclerView.Adapter<ImageAdapter.ImageViewHolder>() {

    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ImageViewHolder {
        val view = LayoutInflater.from(parent.context).inflate(R.layout.item_image, parent, false)
        return ImageViewHolder(view)
    }

    override fun onBindViewHolder(holder: ImageViewHolder, position: Int) {
        val imageRes = images[position]
        holder.imageView.setImageResource(imageRes)
    }

    override fun getItemCount(): Int {
        return images.size
    }

    inner class ImageViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
        val imageView: ImageView = itemView.findViewById(R.id.imageView)
    }
}

val viewPager: ViewPager2 = findViewById(R.id.viewPager)
val images = listOf(R.drawable.image1, R.drawable.image2, R.drawable.image3) // 图片资源列表
val imageAdapter = ImageAdapter(images)
viewPager.adapter = imageAdapter

override fun onBindViewHolder(holder: ImageViewHolder, position: Int) {
    val imageRes = images[position]
    holder.imageView.setImageResource(imageRes)
    
    // 设置背景
    val backgroundRes = getBackgroundRes(position)
    holder.itemView.setBackgroundResource(backgroundRes)
}

private fun getBackgroundRes(position: Int): Int {
    // 根据position返回对应的背景资源
    // 这里可以根据需求自定义不同的背景
    return when (position) {
        0 -> R.drawable.background1
        1 -> R.drawable.background2
        2 -> R.drawable.background3
        else -> R.drawable.default_background
    }
}