如何隐藏 recyclerview 上最后单击项目的视图

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。当用户单击新项目时，我想为上一个单击消失 pauseButton，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。每当我点击 recyclerView 上的新内容时，pauseButton 应该出现在最新的项目上，而在前一个项目上消失。

Answer 1

您需要在 RecyclerView.Adapter

中保持状态

内部适配器：

private var playingPosition: Int? = null

点击事件发生时：

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

此外，您的模型应保持播放状态：`

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

onBindViewHolder 内部：

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

Answer 2

目前的功能只适用于recyclerview 的一项，所以你不能在这里做。如果你想这样做，你可以这样做。您可以将 isPlay 值添加到 SongInfoModel，当点击播放时，您可以为除当前播放歌曲之外的所有歌曲设置 isPlay = false。

所以代码将是这样的：

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
    }

    if(songInfoList[position].getIsPlaying){
       holder.pauseButton.setVisibility(View.VISIBLE)
    }else{
       holder.pauseButton.setVisibility(View.GONE)
    }

    holder.pauseButton.setOnClickListener {
        if (mediaPlayer.isPlaying) {
            holder.pauseButton.setImageResource(R.drawable.play)
            mediaPlayer.pause()
         } else {
            holder.pauseButton.setImageResource(R.drawable.pause)
            mediaPlayer.start()
         }

         setPlayingSong(position)
    }

}


    public void setPlayingSong(int pos){
       for (int i = 0; i < songInfoList.size; i++){
         songInfoList.get(i).setIsPlaying(false);
        }
       songInfoList.get(pos).setIsPlaying(true);
       notifyDataSetChanged();
    }

如何隐藏 recyclerview 上最后单击项目的视图

How to hide the view of last clicked item on the recyclerview

android

android-adapter

kotlin

android-recyclerview