RecyclerView not calling onCreateViewHolder or onBindView

Question

Not getting any errors and all the data seems valid. For some reason, nether of the view related methods are being called. I have made sure of the following:

• getItemCount() is the only adapter method being called and is returning a positive integer value, (I know this will be the area you guys will look at)

  • Constructor is being called, member variables are valid.

  • Parent View is a vertical LinearLayout; no scrollview, or any other view with their own scroll properties in sight.

  • containing fragment view is created and shown on screen.

Here is the declaration in the fragment followed by the adapter. Any help would be appreciated as this has be completely baffled.

SubMenuAdapter adapter = new SubMenuAdapter(getActivity(), mContentItems);     recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));     recyclerView.setItemAnimator(new DefaultItemAnimator());     recyclerView.setAdapter(adapter); 

public class SubMenuAdapter extends RecyclerView.Adapter<SubMenuAdapter.ViewHolder> { private static final String TAG = String.format("==> %S", SubMenuAdapter.class.getSimpleName());  private final List<ContentItem> mContentItems; private Context mContext;  public SubMenuAdapter(Context context, List<ContentItem> contenItems) {     Log.d(TAG, "Constructor called");     mContentItems = contenItems;     mContext = context; }  @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {     Log.d(TAG, "onCreateViewHolder called");     View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_resource_efficiency, parent, false);     return new ViewHolder(view); }  @Override public void onBindViewHolder(ViewHolder holder, int position) {     Log.d(TAG, "onBindViewHolder called");      ContentItem item = mContentItems.get(position);     holder.textName.setText(item.getName());     FontSetter.setMyriadProRegular(mContext, holder.textName);     Picasso.with(mContext).load("file://" + item.getPreviewImageDefault()).into(holder.imageIcon); }  @Override public int getItemCount() {     Log.d(mContext, String.format("getItemCount: %d", mContentItems.size()));     return mContentItems.size(); }  // ViewHolder public static class ViewHolder extends RecyclerView.ViewHolder {      TextView textName;     ImageView imageIcon;      public ViewHolder(View view) {         super(view);         textName = (TextView) view.findViewById(R.id.tv_resource_efficiency_option);         imageIcon = (ImageView) view.findViewById(R.id.iv_resource_efficiency_icon);     } } 

Answer 1

This may also help someone

First Use

recyclerView.setAdapter(adapter); 

And then:

recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 

So it will look like this:

recyclerView.setAdapter(adapter); recyclerView.setLayoutManager(new LinearLayoutManager(getActivity())); 

The order is reversed

Update:

Nowadays I simply use:

app:layoutManager="androidx.recyclerview.widget.LinearLayoutManager" 

on the RecyclerView in the xml

Answer 2

Been chasing answer for over an hour.

Dont forget to call this one liner before setting your adapter.

recyclerView.setLayoutManager(new LinearLayoutManager(this)); 

It seems that recycler view do not have default layout manager option built in so we have to programatically add it.

Cheers if you found it helpful.