Question

当我单击项目时，我会得到

java.lang.ArrayIndexOutOfBoundsException：长度= 10;索引= -1

这是我的onCreateViewHolder方法，当我单击项目时，我想打开DetailActivity并故意发送数据

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val view = LayoutInflater.from(parent.context).inflate(R.layout.alphabet_item, parent, false)
    val holder = ViewHolder(view)
    view.setOnClickListener {
        val intent = Intent(parent.context, ItemAlphabetDetailActivity::class.java)
        intent.putExtra("NAME", alphabets[holder.position].context)/*
        intent.putExtra("CONTEXT", alphabets[holder.adapterPosition].context)
        intent.putExtra("IMAGE", alphabets[holder.adapterPosition].image)
        intent.putExtra("SOUND", alphabets[holder.adapterPosition].sound)*/
        parent.context.startActivity(intent)
    }
    return ViewHolder(view)
}

这是我的课程ItemAlphabetAdapter

class ItemAlphabetAdapter(
private val alphabets: ArrayList<ItemAlphabet>
) : RecyclerView.Adapter<ItemAlphabetAdapter.ViewHolder>() {


override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
    val view = LayoutInflater.from(parent.context).inflate(R.layout.alphabet_item, parent, false)
    val holder = ViewHolder(view)
    view.setOnClickListener {
        val intent = Intent(parent.context, ItemAlphabetDetailActivity::class.java)
        intent.putExtra("NAME", alphabets[holder.position].context)/*
        intent.putExtra("CONTEXT", alphabets[holder.adapterPosition].context)
        intent.putExtra("IMAGE", alphabets[holder.adapterPosition].image)
        intent.putExtra("SOUND", alphabets[holder.adapterPosition].sound)*/
        parent.context.startActivity(intent)
    }
    return ViewHolder(view)
}

override fun getItemCount(): Int = alphabets.size


override fun onBindViewHolder(holder: ItemAlphabetAdapter.ViewHolder, position: Int) {

    val alphabet = alphabets[position]
    holder.name.text = alphabet.name
    holder.image.visibility = alphabet.image
}

class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
    val image: ImageView = itemView.findViewById(R.id.alphabet_image)
    val name: TextView = itemView.findViewById(R.id.alphabet_name)

}

}

Answer 1

您必须编写以下代码

val intent = Intent(parent.context, ItemAlphabetDetailActivity::class.java)
        intent.putExtra("NAME", alphabets[holder.position].context)/*
        intent.putExtra("CONTEXT", alphabets[holder.adapterPosition].context)
        intent.putExtra("IMAGE", alphabets[holder.adapterPosition].image)
        intent.putExtra("SOUND", alphabets[holder.adapterPosition].sound)*/
        parent.context.startActivity(intent)

在onBindViewHolder（）中，它已经为您提供了位置作为参数之一

Answer 2

onCreateViewHolder方法不会在每次recyclerview需要显示一行时调用，而仅在需要创建新视图且屏幕上没有足够视图时才调用。而是，为每个位置调用onBindViewHolder方法。因此，要获得该行的确切位置，请使用$ git checkout -b estimated-time Switched to a new branch 'estimated-time' D ~$W error messages.docx。

Answer 3

尝试一下。将您的setOnClickListener移动到onBindViewHolder

itemView.setOnClickListener { if（position！=-1）{

    val intentIntent(itemView.context,ItemAlphabetDetailActivity::class.java)
    intent.putExtra("NAME", alphabets[position].context)/*
    intent.putExtra("CONTEXT", alphabets[position].context)
    intent.putExtra("IMAGE", alphabets[position].image)
    intent.putExtra("SOUND", alphabets[position].sound)*/
    parent.context.startActivity(intent)
}}

在Adapter类中获取ArrayIndexOutOfBoundsException

3 个答案: