Recyclerview 单击事件不适用于数据绑定和实时数据

Question

我是 Kotlin 的新手，我正在使用数据绑定库在我从视图模型获取的 recyclerview 中设置项目，并在 activity class 中调用 clicklistener。我已经在我的适配器 class 中定义了一个接口并在 activity 中实现了，但是当我点击 recyclerview 项目并且没有收到任何错误时没有任何反应。我无法找出错误

我的适配器是这样的

class NewsAdapter (private var listener: OnNewsClickListener) : RecyclerView.Adapter<RecyclerView.ViewHolder>() {
private val mCategoryList = ArrayList<Newslist>()

fun setAppList(categoryModel: ArrayList<Newslist>) {
    mCategoryList.addAll(categoryModel)
    //notifyItemRangeInserted(0, categoryModel.size)
    notifyDataSetChanged()
}

override fun getItemCount(): Int {
    Log.d("LIST_SIZE","" + mCategoryList.size)
    return mCategoryList.size
}

override fun onBindViewHolder(holder: RecyclerView.ViewHolder, position: Int) {
    val appInfo = mCategoryList[position]
   (holder as NewsAdapter.RecyclerHolderCatIcon).bind(appInfo, listener)
}

override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): RecyclerView.ViewHolder {
    val layoutInflater = LayoutInflater.from(parent.context)
    val applicationBinding = ItemNewsBinding.inflate(layoutInflater, parent, false)
    return RecyclerHolderCatIcon(applicationBinding)
}

interface OnNewsClickListener {
    fun onNewsClick(position: Int)
}

inner class RecyclerHolderCatIcon(private var applicationBinding:ItemNewsBinding) : RecyclerView.ViewHolder(applicationBinding.root) {
    fun bind(appInfo:Newslist, listener: OnNewsClickListener?) { 
        applicationBinding.newsItem  = appInfo
    }
}

}

Answer 1

您需要像这样在bind中设置点击监听器。

这里是示例代码，您需要修改它

fun bind(appInfo:Newslist, listener: OnNewsClickListener?) { 
    applicationBinding.newsItem  = appInfo
    itemView.setOnClickListener( view -> {
        if (listener != null) {
            listener.onNewsClick();
        }
    }
}

Answer 2

因为您没有为表单项布局设置监听器。您不需要定义 OnClickListener 接口。

inner class RecyclerHolderCatIcon(private var applicationBinding:ItemNewsBinding) : RecyclerView.ViewHolder(applicationBinding.root) {
    fun bind(appInfo:Newslist) { 
        applicationBinding.root.setOnClickListener{ /*handle click here*/ }
    }
}

Recyclerview 单击事件不适用于数据绑定和实时数据

Recyclerview click event not working with databinding and livedata

android

kotlin

mvvm

android-databinding