android - 如何在 xamarin 中使用嵌套的 recyclerviews?
问题描述
好吧,我知道如何在 android studio 中实现嵌套的 recyclerview,但我正在进行一项新工作,我们正在使用 xamarin .. 我在实现父适配器时遇到问题。有什么建议吗?
我试图制作 2 个 diffs recyclerview,一些谷歌搜索,什么都没有。
class ParentAdapter(private val parents : List<ParentModel>) :
RecyclerView.Adapter<ParentAdapter.ViewHolder>(){
private val viewPool = RecyclerView.RecycledViewPool()
override fun onCreateViewHolder(parent: ViewGroup,
viewType: Int): ViewHolder {
val v = LayoutInflater.from(parent.context)
.inflate(R.layout.parent_recycler,parent,false)
return ViewHolder(v)
}
override fun getItemCount(): Int {
return parents.size
}
override fun onBindViewHolder(holder: ViewHolder,
position: Int) {
val parent = parents[position]
holder.textView.text = parent.title
val childLayoutManager = LinearLayoutManager(
holder.recyclerView.context, LinearLayout.HORIZONTAL, false)
childLayoutManager.initialPrefetchItemCount = 4
holder.recyclerView.apply {
layoutManager = childLayoutManager
adapter = ChildAdapter(parent.children)
setRecycledViewPool(viewPool)}}
inner class ViewHolder(itemView : View) : RecyclerView.ViewHolder(itemView){
val recyclerView : RecyclerView = itemView.rv_child
val textView:TextView = itemView.textView}
}
下面代码的问题在于 onBindViewHolder.. 在线性布局管理器中,我无法放置正确的上下文。
解决方案
我无法重复您的问题,这是我的简单示例:
外部recyclerview适配器:
class RecyclerAdapter : RecyclerView.Adapter
{
// add this variable
private List<ListItem> mEmails;
public RecyclerAdapter(List<ListItem> mEmails, Context context)
{
this.mEmails = mEmails;
}
public override int ItemCount
{
get { return mEmails.Count; }
}
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
RecyclerViewHolder myHolder = holder as RecyclerViewHolder;
LinearLayoutManager mLayoutManager = new LinearLayoutManager(myHolder.mRc.Context, LinearLayoutManager.Horizontal, false);
mLayoutManager.InitialPrefetchItemCount = 4;
myHolder.mRc.SetLayoutManager(mLayoutManager);
myHolder.mRc.SetAdapter(new MyRcAdapter());
myHolder.mName.Text = ((Email)mEmails[position]).date;
myHolder.mSubject.Text = ((Email)mEmails[position]).Subject;
myHolder.mMessage.Text = ((Email)mEmails[position]).Message;
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
View row = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.row, parent, false);
RecyclerViewHolder view = new RecyclerViewHolder(row);
return view;
}
class RecyclerViewHolder1 : RecyclerView.ViewHolder
{
public TextView mName;
public TextView mSubject;
public TextView mMessage;
public RecyclerView mRc;
public RecyclerViewHolder1(View itemView) : base(itemView)
{
mName = itemView.FindViewById<TextView>(Resource.Id.ore);
mSubject = itemView.FindViewById<TextView>(Resource.Id.contratti);
mMessage = itemView.FindViewById<TextView>(Resource.Id.resa);
mRc = itemView.FindViewById<RecyclerView>(Resource.Id.inside_rc);
}
}
}
和内部 recyclerview 适配器:
class MyRcAdapter : RecyclerView.Adapter
{
private string[] ssss = new string[] { "1", "2", "3", "1", "2", "3" };
public override int ItemCount => ssss.Length;
public override void OnBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
InsideHolder myHolder = holder as InsideHolder;
myHolder.mName.Text = ssss[position];
}
public override RecyclerView.ViewHolder OnCreateViewHolder(ViewGroup parent, int viewType)
{
View row = LayoutInflater.From(parent.Context).Inflate(Resource.Layout.inside, parent, false);
InsideHolder view = new InsideHolder(row);
return view;
}
class InsideHolder : RecyclerView.ViewHolder
{
public TextView mName;
public InsideHolder(View itemView) : base(itemView)
{
mName = itemView.FindViewById<TextView>(Resource.Id.inside);
}
}
}
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