未连接适配器;跳过布局onCreateView() [英] No adapter attached; skipping layout onCreateView()
问题描述
尝试在我的应用程序中实现RecyclerView时,我不明白为什么会收到未连接适配器;跳过布局的原因,我想我已经在onCreateView中明确设置了它。其他一些帖子建议将其移至Oncreate(),但是当我这样做时,我会收到更多错误。如果有帮助,我按照了教程的要求。这是我的主要活动课
Trying to implement RecyclerView into my application, I don't understand why i'm getting "No adapter attached; skipping layout" I thought i clearly set it up in the onCreateView. Some other posts suggested to move it to Oncreate() but when i do that i get many more errors. I followed this tutorial if it helps. Here is my Main Activity class
我不认为这是另一个问题的重复,尽管可能是相似的。当移到onCreate()时,整个应用程序崩溃。
I do not believe this is a duplicate of another question, although it might be similar. when moved to onCreate() the entire application crashes.
public class MainActivity extends ActionBarActivity {
private Toolbar toolbar;
private RecyclerView recyclerView;
private Adapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState){
View layout=inflater.inflate(R.layout.activity_main, container, false);
recyclerView= (RecyclerView) layout.findViewById(R.id.meme_list);
adapter = new Adapter(this,getData());
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
return layout;
}
public static List<Memes> getData(){
List<Memes> data = new ArrayList<>();
String[] names ={"meme1", "meme2", "meme3"};
for(int i=0; i<names.length; i++)
{
Memes meme = new Memes();
meme.name=names[i];
data.add(meme);
}
return data;
}
这里是适配器类
public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> {
private LayoutInflater inflater;
List<Memes> data = Collections.emptyList();
public Adapter(Context context, List<Memes> data){
inflater = LayoutInflater.from(context);
this.data=data;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.meme_item, parent, false);
MyViewHolder holder = new MyViewHolder(view);
return null;
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Memes current=data.get(position);
holder.title.setText(current.name);
}
@Override
public int getItemCount() {
return data.size();
}
class MyViewHolder extends RecyclerView.ViewHolder{
TextView title;
public MyViewHolder(View itemView) {
super(itemView);
title=(TextView)itemView.findViewById(R.id.name);
}
}
主要活动xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="@+id/tool_bar"
layout="@layout/tool_bar">
</include>
<android.support.v7.widget.RecyclerView
android:layout_marginTop="@dimen/activity_horizontal_margin"
android:id="@+id/meme_list"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
用于回收站视图的XML项目
XML for layout of recycler view items
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="@+id/name"
android:layout_gravity="left"
android:padding="8dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Dummy text"/>
(是,该应用包含模因,但以前的版本吸引了很多用户)
(Yes, the app consists of memes, previous version pulled in a lot of users though)
推荐答案
尝试在 onCreateView中移动代码()
您的Activity的方法,以 onCreate()
:
Try move the code in onCreateView()
method of your Activity to onCreate()
:
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.tool_bar);
setSupportActionBar(toolbar);
recyclerView = (RecyclerView) findViewById(R.id.meme_list);
adapter = new Adapter(this,getData());
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
您还需要返回 ViewHolder
作为@YasinKaçmaz的答案。
You also need to return ViewHolder
as @Yasin Kaçmaz 's answer.
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