RecyclerView inside ViewPager Fragment don't show

Question

So i have a fragment, which have a viewpager with tablayout, which consist of two tabs-two fragments.

The thing is, recyclerview shows empty, and i have no idea why.,

Tab Fragment LAyout:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>
</LinearLayout>

Tag Fragment:

List<OrderListItem> orderList = new ArrayList<>();
        orderList.add(new OrderListItem(333, "ABCDE", new Date(), new Date(), false, true));

        adapter = new OrderListAdapter(orderList, this.getActivity());
        layoutManager = new LinearLayoutManager(this.getActivity(), LinearLayoutManager.VERTICAL, false);
        myRecyclerView.setLayoutManager(layoutManager);
        myRecyclerView.setAdapter(adapter);

Adapter:

public class OrderListAdapter extends RecyclerView.Adapter<OrderListAdapter.ViewHolder>{

    private List<OrderListItem> orderList;
    @LayoutRes
    private final int layoutRes;

    private Context context;
    private final LayoutInflater inflater;

    public OrderListAdapter(List<OrderListItem> orderList, Context context){
        this.orderList = orderList;
        this.layoutRes = R.layout.order_list_item_layout;
        this.context = context;
        inflater = LayoutInflater.from(this.context);
    }

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = inflater.inflate(layoutRes, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        final OrderListItem item = orderList.get(position);    
    }

    public void setItems(List<OrderListItem> orderList){
        this.orderList.clear();
        this.orderList.addAll(orderList);
        notifyDataSetChanged();
    }

    @Override
    public int getItemCount() {
        return orderList.size();
    }

    public static class ViewHolder extends RecyclerView.ViewHolder {

        public ViewHolder(View itemView) {
            super(itemView);

        }
    }
}

RecycleView Item some colorful layouts insider, so i know if the child layout is there or not, which it isnt. any idea why recyclerview is empty?

edit1: i know the recyclerview is there, because its in a lolipop phone, and if i make a movement at the recycler place it shows me the ripple top and bottom scroll border. but the child layouts are empty and blank, and should be colorful as i specificed in the child layout.

eit2. just used a listview with a simpleAdapter and it is showing. there must be something buggy with the rv

edit3: row layout (i should clearly see an empty textview with a color, besides not any value setted.)

<LinearLayout
    android:layout_height="match_parent"
    android:layout_width="match_parent"
    android:background="@color/black"
    xmlns:android="http://schemas.android.com/apk/res/android">

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/material_deep_teal_200"
        android:text="New Text"
        android:id="@+id/textView" />
</LinearLayout>

Answer 1

Change:

android:layout_width="match_parent"
android:layout_height="match_parent"

to

android:layout_width="50dp"  // set yourself
android:layout_height="50dp" // set yourself

Answer 2

Where is the logic in which you set OrderListItem properties to ui? You have first to set ViewHolder components:

public static class ViewHolder extends RecyclerView.ViewHolder {
    TextView mTitleTv;
    public ViewHolder(View itemView) {
        super(itemView);
        mTitle = itemView.findViewById(R.id.textview_id_in_your_xml_file);
    }
}

And then set them in onBindViewHolder:

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    final OrderListItem item = orderList.get(position);   
    holder.mTitleTv.setText(item.getReplaceThisWithAStringProperty);
}

EDIT

If you have to use default LinearLayoutManager properties use this constructor:

layoutManager = new LinearLayoutManager(getActivity());

Instead of this:

layoutManager = new LinearLayoutManager(this.getActivity(), LinearLayoutManager.VERTICAL, false);

Add also fixed size property for RecyclerView:

recyclerView.setHasFixedSize = true;