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Recyclerview not call any Adapter method :onCreateViewHolder,onBindViewHolder,

2022-07-06 20:13:00 【Technology feast】

problem ：

my RecyclerView do not call onCreateViewHolder, onBindViewHolder, therefore, does not appear nothing in recyclerview. my RecyclerView Do not call onCreateViewHolder、onBindViewHolder, therefore , stay recyclerview Nothing will appear in .I put logs for debugging, and no log is shown. I put the debug log , No log is displayed .What can be? What can it be ？

My adapter: My adapter ：

public class CommentListAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder>{private static final int EMPTY_VIEW = 10 ;private ArrayList<comment> mItems;Boolean firstTime = true;private Typeface mTf = null;Context mContext;public CommentListAdapter(Context context,ArrayList<comment> items){    Log.e("Adapter", "constructor Called");    this.mItems = items;    mContext = context;}public class EmptyViewHolder extends RecyclerView.ViewHolder {    public EmptyViewHolder(View itemView) {        super(itemView);    }}public class ViewHolder extends RecyclerView.ViewHolder{    TextView mAuthorName;    TextView mMessage;    NetworkImageView mThumbnail;    public ViewHolder(View itemView) {        super(itemView);        mAuthorName = (TextView)itemView.findViewById(R.id.author_name);        mMessage = (TextView)itemView.findViewById(R.id.message);        mThumbnail = (NetworkImageView)itemView.findViewById(R.id.author_avatar);    }}public void add(comment item, int position) {    mItems.add(position, item);    notifyItemInserted(position);}public void remove(comment item) {    int position = mItems.indexOf(item);    mItems.remove(position);    notifyItemRemoved(position);}@Overridepublic RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){    Log.e("Adapter", "onCreateViewHolder Called");    View v;    if(firstTime){        mTf = BBcTypeFace.getTypeFace(parent.getContext().getApplicationContext(),"font/bbc.ttf");        firstTime = false;    }    if( viewType == EMPTY_VIEW){        v = LayoutInflater.from(parent.getContext())                .inflate(R.layout.comment_empty_row,parent,false);        EmptyViewHolder evh = new EmptyViewHolder(v);        return evh;    }else {        v = LayoutInflater.from(parent.getContext())                .inflate(R.layout.comment_row, parent, false);        ViewHolder vh = new ViewHolder(v);        return vh;    }}@Overridepublic void onBindViewHolder(RecyclerView.ViewHolder viewHolder, int position) {    Log.e("Adapter", "onBindViewHolder Called");    if(viewHolder instanceof ViewHolder) {        ViewHolder holder = (ViewHolder)viewHolder;        comment c = mItems.get(position);        Log.e("Adapter", "Comment is\n: " + c.toString());        final ViewHolder finalHolder = holder;        ImageRequest request = new ImageRequest(c.author_img_link, new Response.Listener<Bitmap>() {            @Override            public void onResponse(Bitmap bitmap) {                if (bitmap != null) {                    finalHolder.mThumbnail.setImageBitmap(bitmap);                }            }        }, 0, 0, null,                new Response.ErrorListener() {                    @Override                    public void onErrorResponse(VolleyError volleyError) {                        VolleyLog.e("ImageLoader", volleyError.getMessage());                        VolleyLog.e("ImageLoader", volleyError.getStackTrace());                    }                });        GetVideoInfo.getInstance(mContext.getApplicationContext()).addToRequestQueue(request);        holder.mAuthorName.setText(c.author_name);        holder.mMessage.setText(c.Message);        holder.mMessage.setTypeface(mTf);        holder.mAuthorName.setTypeface(mTf);    }}@Overridepublic int getItemCount() {    Log.e("Adapter", "getItemCount() Called");    return (mItems.size() > 0 ? mItems.size() : 1);}@Overridepublic int getItemViewType(int position) {    Log.e("Adapter", "getItemViewType() Called");    if (mItems.size() == 0) {        return EMPTY_VIEW;    }    return super.getItemViewType(position);}}

I will use public void add(comment item, int position){...} to add item in RecyclerView. I will use public void add(comment item, int position){...} stay RecyclerView Add items to .

in Fragment : In the clip ：

private RecyclerView mRecyclerView;private CommentListAdapter mAdapter;private LayoutManager mLayoutManager;@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,                         Bundle savedInstanceState) {    View rootView = inflater.inflate(R.layout.fragment_item_detail, container, false);....    mLayoutManager = new LinearLayoutManager(getActivity());    mAdapter = new CommentListAdapter(getActivity(),new ArrayList<comment>());    mRecyclerView = (RecyclerView)rootView.findViewById(R.id.comment_list);    mRecyclerView.setHasFixedSize(true);    mRecyclerView.setLayoutManager(mLayoutManager);    mRecyclerView.setAdapter(mAdapter);    mRecyclerView.setItemAnimator(new DefaultItemAnimator());    makeJsonObjectRequest(mItem.url);    return rootView;}

XML Files :XML file ：

<ScrollViewxmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent"    android:layout_height="wrap_content"    android:id="@+id/scrollView"    android:background="@android:color/white"    android:layout_alignParentLeft="true"    android:layout_alignParentStart="true"    android:layout_alignParentBottom="true">    ....        <RelativeLayout            xmlns:android="http://schemas.android.com/apk/res/android"            android:layout_width="match_parent"            android:layout_height="match_parent">.....            <android.support.v7.widget.RecyclerView                android:id="@+id/comment_list"                android:layout_width="match_parent"                android:layout_height="match_parent">            </android.support.v7.widget.RecyclerView>....        </RelativeLayout>    ....</ScrollView>

comment_row xml file :comment_row xml file ：

<?xml version="1.0" encoding="utf-8"?><LinearLayout    android:orientation="horizontal"    xmlns:android="http://schemas.android.com/apk/res/android"    android:layout_width="match_parent" android:layout_height="wrap_content"android:gravity="right"android:background="@android:color/darker_gray"><LinearLayout        android:orientation="vertical"        android:layout_width="wrap_content"        android:layout_height="wrap_content"    android:gravity="right">        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:textAppearance="?android:attr/textAppearanceMedium"            android:id="@+id/author_name"            android:layout_alignParentTop="true"            android:layout_toLeftOf="@+id/author_avatar"            android:layout_toStartOf="@+id/author_avatar"            android:gravity="right" />        <TextView            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:id="@+id/message"            android:layout_below="@+id/author_name"            android:layout_toLeftOf="@+id/author_avatar"            android:layout_toStartOf="@+id/author_avatar"            android:gravity="right" />        </LinearLayout><com.android.volley.toolbox.NetworkImageView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:id="@+id/author_avatar"    android:layout_alignParentTop="true"    android:layout_alignParentRight="true"    android:layout_alignParentEnd="true"    android:minHeight="150dp"    android:minWidth="150dp" /></LinearLayout>

I will add item to RecyclerView with this code : I will use the following code to add the project to RecyclerView：

JsonObjectRequest jsonObjReqComment = new             JsonObjectRequest(Request.Method.GET,urlJsonObj+"#comment", null,                     new Response.Listener<JSONObject>() {                         @Override                         public void onResponse(JSONObject response) {                             try {                                 JSONArray res = response.getJSONArray("response");                                 //Log.e("Comment","Count:"+response.toString());                                 //Log.e("Comment","Count:"+res.length());                                 for (int i = 0; i < res.length(); i++) {                                     JSONObject thread = res.getJSONObject(i);                                     JSONObject author_json = thread.getJSONObject("author");                                     int dislikes = thread.getInt("dislikes");                                     int likes = thread.getInt("likes");                                     String Message = thread.getString("message");                                     //get Author info                                     String author_img_link = author_json.getJSONObject("avatar").getString("permalink");                                     String author_name = author_json.getString("name");                                     comment c = new comment(dislikes,likes,Message,author_img_link,author_name);                                     //Log.e("Comment",c.toString());                                     //commentsList.add(c);                                     mAdapter.add(c,0);                                 }                             } catch (JSONException e) {                                 Log.e("OnResponse","Error JSON");                                 e.printStackTrace();                             } catch (Exception e){                                 Log.e("OnResponse","Error Exception");                                 e.printStackTrace();                             }                         }                     }                     , new Response.ErrorListener() {                 @Override                 public void onErrorResponse(VolleyError error) {                     VolleyLog.d("vOLLEY", "Error: " + error.getMessage());                     // hide the progress dialog                 }             }             ){                 @Override                 public Map<String, String> getHeaders(){                     Map<String, String> headers = new HashMap<String, String>();                     headers.put("User-agent", "Comment");                     return headers;                 }             };