How to display listItem on emulator on recyclerview?

what I am trying to do is show a custom card in a recyclerview.

I can see it on the design view on android studio, but no when the emulator runs.

I just need to display de listItem.

Is is posible? if so, any help or suggestion would be great, thanks.

    <androidx.recyclerview.widget.RecyclerView
            android:id="@+id/rcvPoolVariables"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_marginTop="22dp"
            android:layout_marginStart="17dp"
            android:layout_marginEnd="17dp"
            tools:listitem="@layout/row_pool_objectives"
            app:layout_constraintTop_toBottomOf="@+id/containerVariableAndWeeks"
            app:layout_constraintBottom_toBottomOf="parent"/>

1.xml

 <androidx.recyclerview.widget.RecyclerView
                android:id="@+id/categoryview"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_gravity="center"
                app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
                app:spanCount="2"
                tools:listitem="@layout/innercategorylist">

  </androidx.recyclerview.widget.RecyclerView>

2.java file

CategoryModel[] myListData1 = new CategoryModel[]{
            new CategoryModel( R.drawable.kiwi,"kiwi"),
            new CategoryModel(R.drawable.watermelon,"watermelon" ),
            new CategoryModel(R.drawable.strawberry,"strawberry")

    };
innerCategoryAdapter = new InnerCategoryAdapter(myListData1, new InnerCategoryAdapter.HomeAdapterInterface() {
            @Override
            public void onRowClick(int searchText) {
            }
        });

3.Adapter class id define and assign and model class to variable getter setter set