android - 如何在recyclerview上隐藏最后单击的项目的 View

Question

ViewHolder:

class HomeViewHolder(view: View) : RecyclerView.ViewHolder(view) {
    val songName: TextView = view.findViewById(R.id.txtNameSong)
    val songArtist: TextView = view.findViewById(R.id.txtNameArtist)
    val cardContent: CardView = view.findViewById(R.id.cardContent)
    val pauseButton: ImageView = view.findViewById(R.id.pauseButton)
}

适配器:

override fun onBindViewHolder(holder: HomeViewHolder, position: Int) {
    val text = songInfoList[position]
    holder.songName.text = text[0]
    holder.songArtist.text = text[1]
    val path = text[2]
    holder.cardContent.setOnClickListener {
        playMusic(path)
        holder.pauseButton.visibility = View.VISIBLE
    }
    holder.pauseButton.setOnClickListener {
        if (mediaPlayer.isPlaying) {
            holder.pauseButton.setImageResource(R.drawable.play)
            mediaPlayer.pause()
         } else {
            holder.pauseButton.setImageResource(R.drawable.pause)
            mediaPlayer.start()
         }
    }
}

每当用户单击recyclerView上的项目并播放音乐时，就会出现 pauseButton。
我想在用户单击新项目时为上次单击的 pauseButton消失，并为新条目显示 pauseButton。但是，我无法做到这一点。告诉我该怎么做。
每当我在recyclerView上单击新内容时， pauseButton就会出现在最新项目上，而消失在前面的项目上。

Answer 1

您需要在RecyclerView.Adapter中保持状态
内部适配器:

private var playingPosition: Int? = null

当发生点击事件时:

//Update previously position
playingPosition?.let {
    models.get(playingPosition).playingState = false
    notifyItemChanged(playingPosition)
}
//update new position
models.get(position).playingState = true
playingPosition = position
notifyItemChanged(position)

另外，您的模型应保持播放状态:

data class Model(...: Int, ...: String, ..., playingState: Boolean)

在onBindViewHolder内部:

if (model.playingState) view.visibility = View.VISIBLE else view.visibility = VIEW.GONE