Recyclerview 未连接适配器

Posted 2023-04-13

【中文标题】Recyclerview 未连接适配器

【英文标题】：Recyclerview No adapter attached

【发布时间】：2018-02-04 06:53:04

【问题描述】：

一切正常。但是在 logcat 中显示了一些错误。

E/RecyclerView：没有附加适配器；跳过布局 E/RecyclerView：没有附加适配器；跳过布局

我的活动代码：

Recyclerview recyclerView = findViewById( R.id.Recyclerview );
LinearLayoutManager  layoutManager = new LinearLayoutManager( this, LinearLayoutManager.VERTICAL, false );
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(toolbaradapter);

我已阅读与同一问题相关的其他问题，但没有任何帮助。 请帮帮我

【问题讨论】：

什么是工具栏适配器？

你在哪里定义回收站的适配器，从你的适配器名称看来你使用了错误的适配器

ToolAdapter toolbaradapter = new ToolAdapter(this, List);这是我的适配器名称。

添加您有问题的整个活动.....

谢谢你重播我。我的问题解决了。适配器首先调用 onCreate() 。

【参考方案1】：

My Activity class:

   public class HelpToolBar extends Activity 
   RecyclerView.Adapter toolbaradapter;
    RecyclerView.LayoutManager layoutManager;
    Header header;
   Recyclerview recyclerView;
    public List<String> List;
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.toolbar);
        List = new ArrayList<>();
    Recyclerview recyclerView = findViewById( R.id.Recyclerview );
        toolbaradapter= new ToolAdapter(HelpToolBar.this,List);
    LinearLayoutManager  layoutManager = new LinearLayoutManager( this, LinearLayoutManager.VERTICAL, false );
    recyclerView.setLayoutManager(layoutManager);
    recyclerView.setHasFixedSize(true);
    recyclerView.setAdapter(toolbaradapter);

      userLogin();

    

    private void userLogin() 
         final JsonObjectRequest req = new JsonObjectRequest(Request.Method.GET, url,
                null, new Response.Listener<JSONObject>() 
            @Override
            public void onResponse(JSONObject response) 
                String code = response.optString("success");
                if (code.equals("true")) 
                    try 
                            JSONObject obj = response.getJSONObject("data");
                        JSONArray abc = obj.getJSONArray("list");
                            for(int i = 0; i < abc.length();i++) 
                                JSONObject item = abc.getJSONObject(i);
                                List.add(item.getString("date"));

                            
                           toolbaradapter= new ToolAdapter(HelpToolBar.this,List);
                            recyclerView.setAdapter(toolbaradapter);

                         catch (JSONException e) 
                            progressbar.hidePDialog();
                            e.printStackTrace();
                        
                
                progressbar.hidePDialog();
            
        , new Response.ErrorListener() 
            @Override
            public void onErrorResponse(VolleyError error) 
                VolleyLog.d("", "Error: " + error.getMessage());
                Log.e("", "Site Info Error: " + error.getMessage());
                progressbar.hidePDialog();
            
        )
        @Override
            public Map<String, String> getHeaders() throws AuthFailureError 
            return header.getHeaders();
            
        ;
        RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
        requestQueue.add(req);
    


My Adapter class:

public class ToolAdapter extends RecyclerView.Adapter<ToolAdapter.ViewHolder> 
    Context context;
   private List<String> List

    public ToolAdapter(HelpToolBar helpToolBar, List<String> List) 
        this.context= helpToolBar;
        this.List=List;

    
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) 
        View itemLayoutView = LayoutInflater.from(parent.getContext())
                .inflate(R.layout.helptooladapter,parent, false);
        return new ViewHolder(itemLayoutView);
    
    @Override
    public void onBindViewHolder(final ViewHolder holder,  int position) 
        holder.textview1.setText(List.get(position) );


    
    @Override
    public int getItemCount() 
        return List.size();
    
    public class ViewHolder extends RecyclerView.ViewHolder 
       public   TextView1 
       public ViewHolder(View itemView) 
            super(itemView);
            textview1= itemView.findViewById(R.id.tooladtextview);