Android recyclerview未连接适配器;跳过布局
刚刚在我的代码中实现了Android recyclerview未连接适配器;跳过布局,android,android-recyclerview,Android,Android Recyclerview,刚刚在我的代码中实现了RecyclerView,替换了ListView 一切正常。显示数据 但正在记录错误消息: 15:25:53.476 E/RecyclerView:未连接适配器;跳过布局 15:25:53.655 E/RecyclerView:未连接适配器;跳过布局 对于以下代码: ArtistArrayAdapter adapter = new ArtistArrayAdapter(this, artists); recyclerView = (RecyclerView) findVi
RecyclerView
,替换了ListView
一切正常。显示数据
但正在记录错误消息:
15:25:53.476 E/RecyclerView:未连接适配器;跳过布局
15:25:53.655 E/RecyclerView:未连接适配器;跳过布局
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));
如您所见,我已为RecyclerView
附加了一个适配器。
那么,为什么我总是犯这个错误呢
我已经阅读了与同一问题相关的其他问题,但没有一个有帮助。您是否可以确保从延迟异步回调之外的“主”线程调用这些语句(例如在
onCreate()
方法中)。
只要我从“延迟”方法调用相同的语句。在我的例子aResultCallback
中,我得到了相同的消息
在我的Fragment
中,从ResultCallback
方法内部调用下面的代码会产生相同的消息。将代码移动到我的应用程序中的onConnected()
方法后,消息消失了
LinearLayoutManager llm = new LinearLayoutManager(this);
llm.setOrientation(LinearLayoutManager.VERTICAL);
list.setLayoutManager(llm);
list.setAdapter( adapter );
在我修复代码中的两个问题之前,我一直收到相同的两条错误消息: (1) 默认情况下,当您在
RecyclerView.Adapter
中实现方法时,它会生成:
@Override
public int getItemCount() {
return 0;
}
确保更新代码,使其显示:
@Override
public int getItemCount() {
return artists.size();
}
显然,如果您的项目中没有项目,那么您将在屏幕上显示零个项目
(2) 我并没有像上面的答案那样做:
(3) 编辑:奖金:
还要确保您的RecyclerView
设置如下:
<android.support.v7.widget.RecyclerView
android:id="@+id/RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<view
android:id="@+id/RecyclerView"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
class SettingsFragment : PreferenceFragmentCompat() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val inflater = LayoutInflater.from(context)
inflater.inflate(R.layout.fragment_settings, null)
}
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
// Missing this line here:
// setPreferencesFromResource(R.xml.settings, rootKey)
}
}
不是这样的:
<android.support.v7.widget.RecyclerView
android:id="@+id/RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
/>
<view
android:id="@+id/RecyclerView"
class="android.support.v7.widget.RecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent" />
class SettingsFragment : PreferenceFragmentCompat() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val inflater = LayoutInflater.from(context)
inflater.inflate(R.layout.fragment_settings, null)
}
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
// Missing this line here:
// setPreferencesFromResource(R.xml.settings, rootKey)
}
}
我看过一些使用后一种方法的教程。虽然它有效,但我认为它也会产生这种错误 如果在创建阶段未设置适配器,则会发生这种情况:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
....
}
public void onResume() {
super.onResume();
mRecyclerView.setAdapter(mAdapter);
....
}
只需将适配器设置移到onCreate中,并使用空数据,然后在进行数据调用时:
mAdapter.notifyDataSetChanged();
我和你有同样的情况,显示是正常的,但错误出现在locat。 这就是我的解决方案: (1) 在CREATE()上初始化RecyclerView&bind适配器 (2) 获取数据时调用notifyDataStateChanged
adapter.notifyDataStateChanged();
在recyclerView的源代码中,还有其他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,我们可以发现其中存在错误:
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 {
只要用这个替换上面的代码就可以了。您所做的错误是在调用布局管理器之前调用了setAdapter(adapter)。1)创建不执行任何操作的对象:)
2) 再次创建不执行任何操作的:)
虽然这不是最好的解决方案,但它确实有效!希望这是有帮助的。我有这个问题,一些时间问题是回收视图放入ScrollView对象 检查实现后,原因似乎如下。如果将RecyclerView放入ScrollView,那么在测量步骤中,它的高度是未指定的(因为ScrollView允许任何高度),因此,它等于最小高度(根据实现),这显然是零 您有两个选项可以修复此问题:
(android.support.v4.widget.NestedScrollView也可以使用
android.support.v4.widget.NestedScrollView)我已经解决了这个错误。您只需要添加布局管理器
并添加空适配器
像这样的代码:
myRecyclerView.setLayoutManager(...//your layout manager);
myRecyclerView.setAdapter(new RecyclerView.Adapter() {
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
return null;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
}
@Override
public int getItemCount() {
return 0;
}
});
//other code's
// and for change you can use if(mrecyclerview.getadapter != speacialadapter){
//replice your adapter
//}
这是一个非常简单的错误,不需要编写任何代码。
发生此错误的原因是活动使用了错误的布局文件。通过IDE,我自动创建了布局的布局v21,该布局成为活动的默认布局。
我在旧布局文件和新布局文件中执行的所有代码都只有很少的xml代码,这导致了该错误
解决方案:复制旧布局的所有代码并粘贴到布局v 21确保通过以下方式设置RecyclerView的布局管理器:
mRecyclerView.setLayoutManager(new LinearLayoutManager(context));
您也可以使用布局管理器,而不是LinearLayoutManager
。如果您正在等待我使用改型之类的数据,那么我也会遇到相同的错误,我会修复它
先于创造
private ArtistArrayAdapter adapter;
private RecyclerView recyclerView;
把它们放在你的Oncreate中
recyclerView = (RecyclerView) findViewById(R.id.cardList);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
adapter = new ArtistArrayAdapter( artists , R.layout.list_item ,getApplicationContext());
recyclerView.setAdapter(adapter);
当您收到数据时,请将
adapter = new ArtistArrayAdapter( artists , R.layout.list_item ,getApplicationContext());
recyclerView.setAdapter(adapter);
现在进入ArtistarayAdapter类并执行此操作。如果数组为空或为null,它将使GetItemCount返回0,如果不是,它将使其成为Artisters数组的大小
@Override
public int getItemCount() {
int a ;
if(artists != null && !artists.isEmpty()) {
a = artists.size();
}
else {
a = 0;
}
return a;
}
这些行必须位于创建时的OnCreate
:
mmAdapter = new Adapter(msgList);
mrecyclerView.setAdapter(mmAdapter);
在我的例子中,我在模拟器中设置了onLocationChanged()
回调和调试中的适配器。因为它没有检测到位置变化,所以它从未开火。当我在emulator的扩展控件中手动设置它们时,它按预期工作。在我的情况下,它是一个被遗忘的组件,位于ViewHolder类中,但它不位于布局文件中我遇到了同样的问题,并意识到我在之后设置了布局管理r和适配器从我的源中检索数据,而不是在onCreate方法中设置两个
salesAdapter = new SalesAdapter(this,ordersList);
salesView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
salesView.setAdapter(salesAdapter);
然后在数据更改时通知适配器
//get the Orders
Orders orders;
JSONArray ordersArray = jObj.getJSONArray("orders");
for (int i = 0; i < ordersArray.length() ; i++) {
JSONObject orderItem = ordersArray.getJSONObject(i);
//populate the Order model
orders = new Orders(
orderItem.getString("order_id"),
orderItem.getString("customer"),
orderItem.getString("date_added"),
orderItem.getString("total"));
ordersList.add(i,orders);
salesAdapter.notifyDataSetChanged();
}
//获取订单
命令;
JSONArray ordersArray=jObj.getJSONArray(“订单”);
对于(int i=0;isalesAdapter = new SalesAdapter(this,ordersList);
salesView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
salesView.setAdapter(salesAdapter);
//get the Orders
Orders orders;
JSONArray ordersArray = jObj.getJSONArray("orders");
for (int i = 0; i < ordersArray.length() ; i++) {
JSONObject orderItem = ordersArray.getJSONObject(i);
//populate the Order model
orders = new Orders(
orderItem.getString("order_id"),
orderItem.getString("customer"),
orderItem.getString("date_added"),
orderItem.getString("total"));
ordersList.add(i,orders);
salesAdapter.notifyDataSetChanged();
}
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
<android.support.v7.widget.RecyclerView
android:id="@+id/chatview"
android:layout_width="0dp"
android:layout_height="0dp"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent">
</android.support.v7.widget.RecyclerView>
<android.support.v7.widget.RecyclerView
android:id="@+id/chatview"
android:layout_width="395dp"
android:layout_height="525dp"
android:layout_marginTop="52dp"
app:layout_constraintTop_toTopOf="parent"
tools:layout_editor_absoluteX="8dp"></android.support.v7.widget.RecyclerView>
</android.support.constraint.ConstraintLayout>
MyRecyclerViewAdapter(Context context, List<String> data) {
this.mInflater = LayoutInflater.from(context); // <-- This is the line most people include me miss
this.mData = data;
}
MyRecyclerViewAdapter recyclerAdapter;
OurDataStuff mData;
....
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//Like this:
RecyclerView recyclerView = findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerAdapter = new RecyclerAdapter(this, mData); //this, is the context. mData is the data you want to pass if you have any
recyclerView.setAdapter(recyclerAdapter);
}
....
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getContext());
recyclerviewItems.setLayoutManager(linearLayoutManager);
someAdapter = new SomeAdapter(getContext(),feedList);
recyclerviewItems.setAdapter(someAdapter);
public void initializeComments(){
comments = new ArrayList<>();
comments_myRecyclerView = (RecyclerView) findViewById(R.id.comments_recycler);
comments_mLayoutManager = new LinearLayoutManager(myContext);
comments_myRecyclerView.setLayoutManager(comments_mLayoutManager);
updateComments();
getCommentsData();
}
public void updateComments(){
comments_mAdapter = new CommentsAdapter(comments, myContext);
comments_myRecyclerView.setAdapter(comments_mAdapter);
}
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
}
@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;
}
@BindView(R.id.recycler_view)
RecyclerView recyclerView;
@Override
public View onCreateView(......) {
View v = ...;
ButterKnife.bind(this, v);
setUpRecycler()
}
public void setUpRecycler(Data data)
if (recyclerView == null) {
/*very silly because this will never happen*/
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
//more setup
//...
}
recyclerView.setAdapter(new XAdapter(data));
}
@Override
public int getItemCount() {
return list.size();
}
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.RecyclerView
android:id="@+id/list"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:listitem="@layout/fragment_products"
android:name="Products.ProductsFragment"
app:layoutManager="LinearLayoutManager"
tools:context=".Products.ProductsFragment"
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"/>
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
<android.support.v7.widget.RecyclerView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layoutManager="android.support.v7.widget.LinearLayoutManager"
app:layout_constraintBottom_toTopOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</android.support.v7.widget.RecyclerView>
class SettingsFragment : PreferenceFragmentCompat() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
val inflater = LayoutInflater.from(context)
inflater.inflate(R.layout.fragment_settings, null)
}
override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
// Missing this line here:
// setPreferencesFromResource(R.xml.settings, rootKey)
}
}
mBinding.serviceProviderCertificates.apply {
adapter = adapter
layoutManager = LinearLayoutManager(activity)
}
mBinding.serviceProviderCertificates.adapter = adapter
mBinding.serviceProviderCertificates.layoutManager = LinearLayoutManager(activity)
private void buildRecyclerView(View v) {
mRecyclerView = v.findViewById(R.id.recycler_view_loan);
mLayoutManager = new LinearLayoutManager(getActivity());
((LinearLayoutManager) mLayoutManager).setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new LoanAdapter(mExampleList);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}
@Override
public int getItemCount() {
try {
return mLoanList.size();
} catch (Exception ex){return 0;}
}
<androidx.recyclerview.widget.RecyclerView
android:id="@+id/recycler_view_chat"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
app:layoutManager="LinearLayoutManager"/>