刚刚在我的代码中实现了RecyclerView，取代了ListView。
一切都很好。显示数据。
但是错误消息正在被记录:
15:25:53.476 E/RecyclerView: No adapter attached; skipping layout
15:25:53.655 E/RecyclerView: No adapter attached; skipping layout
对于以下代码:
ArtistArrayAdapter adapter = new ArtistArrayAdapter(this, artists);
recyclerView = (RecyclerView) findViewById(R.id.cardList);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
正如您所看到的，我已经为RecyclerView附加了一个适配器。
为什么我总是得到这个错误呢?
我读过与这个问题相关的其他问题，但没有一个有用。
我得到了相同的两个错误消息，直到我在我的代码中修复了两个东西:
默认情况下，当你在RecyclerView中实现方法时。它生成的适配器:
@Override
public int getItemCount() {
return 0;
}
确保你更新了你的代码，让它说:
@Override
public int getItemCount() {
return artists.size();
}
显然，如果你的项目中没有项目，那么屏幕上显示的东西就会是零。
(2)我没有这样做，如上面的答案所示:CardView layout_width="match_parent"不匹配父RecyclerView宽度
//correct
LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_listitem, parent, false);
//incorrect (what I had)
LayoutInflater.from(parent.getContext())
.inflate(R.layout.card_listitem,null);
(3)编辑:奖金:
还要确保你像这样设置你的RecyclerView:
<android.support.v7.widget.RecyclerView
android:id="@+id/RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
不是这样的:
<view
android:id="@+id/RecyclerView"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
我看过一些使用后一种方法的教程。当它工作时，我认为它也会产生这个错误。
我得到了同样的问题，我做的每件事都是正确的，除了在xml文件:
step first 1: initialize recyclerview & List & Adaptor:
RecyclerView recyclerview;
List<ModelName> list;
ProvideBidAdaptor adaptor;
step 2: bind it in onCreate-
recyclerview = findByViewId(R.id.providerBidRV);
recyclerview.setLayoutManager(new LinearLayoutManager(this));
recyclerview.setHasFixedSize(true);
list = new ArrayList<>();
step 3: Where you getting response or list - add list- (i am getting from response)>
responseList.addAll(response.getResponse());
adaptor = new ProvideBidAdaptor(this, responseList);
binding.detailsRV.setAdapter(adaptor);
这是我的xml文件，我实现RecyclerView:
我忘记了线性布局的方向，经过这个修正- RecyclerView附加。
<?xml version="1.0" encoding="utf-8"?>
<layout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".activities.Bidding.ProvideBid">
<include
android:id="@+id/toolbar"
layout="@layout/app_toolbar"/>
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/providerBidRV"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</LinearLayout>
</layout>
这是适配器:
public class ProvideBidAdaptor extends RecyclerView.Adapter<ProvideBidAdaptor.ViewHolder> {
Context context;
List<Response> responseList;
DateTime dateTimeInstance = new DateTime();
public ProvideBidAdaptor(Context context, List<Response> responseList) {
this.context = context;
this.responseList = responseList;
}
@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.geo_presence_item_list, parent, false);
return new ViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
final Response detailsResponse = responseList.get(position);
if (!detailsResponse.getUserId().isEmpty()) {
holder.day.setText(detailsResponse.getDay());
holder.locationType.setText(detailsResponse.getLocationType());
}
}
@Override
public int getItemCount() {
return responseList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
TextView date,locationType;
CardView provideBidCV;
LinearLayout dayLLayout,locationTypeLLayout;
public ViewHolder(@NonNull View itemView) {
super(itemView);
date = itemView.findViewById(R.id.date_value);
day = itemView.findViewById(R.id.day_value);
locationType = itemView.findViewById(R.id.locationType_value);
locationTypeLLayout = itemView.findViewById(R.id.locationTypeLLayout);
}
}
}
对于那些在片段中使用RecyclerView并从其他视图中扩展它的人:当扩展整个片段视图时，确保将RecyclerView绑定到它的根视图。
我为适配器正确地连接和做了所有事情，但我从未进行绑定。
@Prateek Agarwal的回答已经为我提供了一切，但这里有更详细的说明。
科特林
override fun onCreateView(inflater: LayoutInflater?, container: ViewGroup?, savedInstanceState: Bundle?): View? {
val rootView = inflater?.inflate(R.layout.fragment_layout, container, false)
recyclerView = rootView?.findViewById(R.id.recycler_view_id)
// rest of my stuff
recyclerView?.setHasFixedSize(true)
recyclerView?.layoutManager = viewManager
recyclerView?.adapter = viewAdapter
// return the root view
return rootView
}
Java
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView= inflater.inflate(R.layout.fragment_layout,container,false);
recyclerview= rootView.findViewById(R.id.recycler_view_id);
return rootView;
}
我有和你一样的情况，显示正常，但是定位器出现错误。
这就是我的解决方案:
(1)在CREATE()上初始化RecyclerView并绑定适配器
RecyclerView mRecycler = (RecyclerView) this.findViewById(R.id.yourid);
mRecycler.setAdapter(adapter);
(2)当你得到数据时调用notifyDataStateChanged
adapter.notifyDataStateChanged();
在recyclerView的源代码中，有另一个线程来检查数据的状态。
public RecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
this.mObserver = new RecyclerView.RecyclerViewDataObserver(null);
this.mRecycler = new RecyclerView.Recycler();
this.mUpdateChildViewsRunnable = new Runnable() {
public void run() {
if(RecyclerView.this.mFirstLayoutComplete) {
if(RecyclerView.this.mDataSetHasChangedAfterLayout) {
TraceCompat.beginSection("RV FullInvalidate");
RecyclerView.this.dispatchLayout();
TraceCompat.endSection();
} else if(RecyclerView.this.mAdapterHelper.hasPendingUpdates()) {
TraceCompat.beginSection("RV PartialInvalidate");
RecyclerView.this.eatRequestLayout();
RecyclerView.this.mAdapterHelper.preProcess();
if(!RecyclerView.this.mLayoutRequestEaten) {
RecyclerView.this.rebindUpdatedViewHolders();
}
RecyclerView.this.resumeRequestLayout(true);
TraceCompat.endSection();
}
}
}
};
在dispatchLayout()中，我们可以发现其中有错误:
void dispatchLayout() {
if(this.mAdapter == null) {
Log.e("RecyclerView", "No adapter attached; skipping layout");
} else if(this.mLayout == null) {
Log.e("RecyclerView", "No layout manager attached; skipping layout");
} else {
