无法在函数内设置ImageView内容描述

Question

为什么我的功能不允许我为ImageView设置内容描述？似乎可以让我设置可绘制资源和文本。

class MyAdapter(
    private val dataIVPlayOrPause: Drawable,
    private val dataTVSong: String
) : RecyclerView.Adapter<RVAdapterEmbark.MyViewHolder>() {

    private val typeHeader = 1
    private val typeItem = 2

    override fun onCreateViewHolder(parent: ViewGroup, type: Int): MyViewHolder {
        return when (type) {
            typeHeader -> MyViewHolder(inflateHelper(R.layout.header, parent))

            typeItem -> MyViewHolder(inflateHelper(R.layout.body, parent))

            else -> MyViewHolder(inflateHelper(R.layout.body, parent))
        }
    }

    override fun onBindViewHolder(viewHolder: MyViewHolder, position: Int) {
        if (getItemViewType(position) == typeHeader) {

        } else if (getItemViewType(position) == typeItem) {
            val ivPlayPause = viewHolder.itemView. iv_Play_Pause
            ivPlayPause(R.drawable.play)
            ivPlayPause = R.string.play.toString()

            val buttonClickListener = View.OnClickListener {
                if (tvSongName.text == null) {
                    playSong(tvSongName, ivPlayPause)
                } else {
                    pauseSong(tvSongName, ivPlayPause)
                }
            }
        }
    }

    private fun inflateHelper(resId: Int, parent: ViewGroup): View {
        return LayoutInflater.from(parent.context).inflate(resId, parent, false)
    }

    class MyViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView)

    override fun getItemCount(): Int {
        return dataTitle.size + 1
    }

    override fun getItemViewType(position: Int): Int {
        return if (position == 0) typeHeader
        else typeItem
    }

    private fun playSong(
        tvSongName: TextView,
        ivPlayPause: ImageView
    ) {
        tvSongName.text = "Song name"

        ivPlayPause.setImageResource(R.drawable.pause)

        ivPlayPause.contentDescription = getString(R.string.pause)

    }
}

Answer 1

由于您在RecyclerView.Adapter中，因此无法访问声明了Activity的Fragment，Context或getString()实例。

在这种情况下，您可以使用Context中的ImageView获取字符串：

ivPlayPause.contentDescription = ivPlayPause.context.getString(R.string.pause)