由于某些原因，我的recyclerview适配器的onCreateViewHolder没有被调用，我无法弄清楚原因。 最初，我在所有recyclerview列表中都使用一个适配器，并且遇到了同样的问题，因此我制作了一个单独的适配器以找出原因。我想相信配置正确。 这是我的适配器
class BrowseMediaRecyclerAdapter(
private val clickListener: (Upload) -> Unit,
private val moreInfoListener: (Upload) -> Unit) : RecyclerView.Adapter<BrowseMediaRecyclerAdapter.ViewHolder>() {
lateinit var binding: BrowseMediaItemListBinding
/**
*
* Autonotify msee
*
*/
private var uploadList: List<Upload> by Delegates.observable(emptyList()) { _, oldList, newList ->
autoNotify(oldList, newList) {old, new -> old.id == new.id}
}
fun updateList(items: List<Upload>?){
uploadList = items!!
Log.e("Items", "Item received: ${items.size}")
}
override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
val inflater = LayoutInflater.from(parent.context)
Log.e("Bind", "View holder created")
binding = DataBindingUtil.inflate(inflater, R.layout.browse_media_item_list, parent, false)
return ViewHolder(binding.root)
}
override fun getItemViewType(position: Int): Int = position
override fun getItemCount(): Int = uploadList.size
override fun onBindViewHolder(holder: ViewHolder, position: Int) {
val item = uploadList[position]
Picasso.get()
.load(item.thumbnailLink)
.placeholder(R.drawable.ic_local_movies_black_24dp)
.fit()
.transform(TransformImage(16f))
.into(holder.thumb)
holder.bind(uploadList[position], binding, clickListener, moreInfoListener)
Log.e("Bind", "Item binded: ${item.id}")
}
class ViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
val thumb: ImageView = itemView.media_thumb
val authorThumb: ImageView = itemView.authorImage
private val moreInfo : FrameLayout = itemView.moreDetail
/**
*
* Bind data
*
*
*/
fun bind(item: Upload, binding: BrowseMediaItemListBinding, clickListener: (Upload) -> Unit, moreInfoListener: (Upload) -> Unit) {
binding.uploadItem = item
thumb.setOnClickListener{clickListener(item)}
moreInfo.setOnClickListener{moreInfoListener(item)}
}
}
}
在我的Fragment中，我以这种方式配置
mediaRecyclerAdapter = BrowseMediaRecyclerAdapter(
{ upload: Upload -> onMediaItemClicked(upload) },
{ upload: Upload -> onMediaMoreInfoClicked(upload) })
binding.subjectUploadsRecyclerView.apply {
this.adapter = mediaRecyclerAdapter
this.layoutManager = LinearLayoutManager(activity, RecyclerView.VERTICAL, false)
this.setHasFixedSize(true)
this.setItemViewCacheSize(10)
}
稍后再在我的观察者中更新列表
private val loadUploadItemsObserver = Observer<SubjectUploads> { subject ->
binding.selectedSubjectText.text = subject.subject_title
mediaRecyclerAdapter.updateList(subject.uploads)
}
我的xml文件
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/subjectsUploadsRecyclerView"
android:layout_width="0dp"
android:layout_height="wrap_content"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@id/selectedSubjectTextFrame"
tools:listitem="@layout/media_item_list" />
我可能做错了什么？可以帮忙吗