Recyclerview not showing list in activity main

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Java

Android

I am developing a POS system in android and trying to list images from an api into a fragment with a recyclerview.when i debug i see the list returned but not in the android code.what more can i do to show the information in my layout.maybe i'm doing something wrong. the main activity is supposed to load the categorylist activity. categorylist is using both categoylistrecyclerview and categorylistrecycler adapter. when i debug i see the list in the category list but i get an error in main activity no recycler adapter attached.meanwhile i have attached it.maybe i'm not setting the image well in the recycleradapter.please check ItemObject if i set the image well

What I have tried:

this is activity main

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:include="http://schemas.android.com/apk/res-auto"
    android:orientation="horizontal"
    tools:context=".MainActivity">

    <LinearLayout
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:background="#f4efef"
        android:orientation="vertical">


        <TextView
            android:id="@+id/order"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"

            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:text="Order"
            android:textAllCaps="true"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp" />
        <!--<View-->
            <!--android:id="@+id/view1"-->
            <!--android:layout_width="match_parent"-->
            <!--android:layout_height="2dp"-->
            <!--android:background="@color/divider" />-->


        <TextView
            android:id="@+id/seatno"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/order"
            android:layout_marginLeft="10dp"
            android:layout_marginTop="10dp"
            android:text="SEAT NO."
            android:textAllCaps="true"
            android:textColor="@color/colorPrimaryDark"
            android:textSize="16sp" />

        <TableLayout
            android:id="@+id/itemlist"
            android:layout_width="match_parent"
            android:layout_height="400dp">

            <TableRow>


                <TextView
                    android:layout_height="30dp"
                    android:layout_column="1"
                    android:width="250dp"
                    android:padding="3dip"
                    android:text="Item"
                    android:textAlignment="center"
                    android:layout_weight="2"
                    android:textSize="16sp"/>

                <TextView
                    android:layout_height="30dp"
                    android:layout_column="2"
                    android:width="80dp"
                    android:gravity="end"
                    android:padding="3dip"
                    android:text="Price"
                    android:textAlignment="center"
                    android:layout_weight="2"
                    android:textSize="16sp"/>

                <TextView
                    android:layout_height="30dp"
                    android:layout_column="3"
                    android:width="60dp"
                    android:gravity="end"
                    android:padding="3dip"
                    android:text="Qty"
                    android:textAlignment="center"
                    android:layout_weight="2"
                    android:textSize="16sp"/>

          </TableRow>
            <TableRow
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="match_parent" />

            <TableRow
                android:layout_width="match_parent"
                android:layout_height="match_parent" />
        </TableLayout>

        <LinearLayout
            android:layout_width="wrap_content"
            android:layout_height="80dp"
            android:orientation="horizontal">

            <TextView
                android:id="@+id/totalamt"
                android:layout_width="390dp"
                android:layout_height="match_parent"
                android:layout_marginLeft="10dp"
                android:layout_marginTop="10dp"
                android:layout_below="@id/itemlist"
                android:text="Amount Due"
                android:textColor="@color/colorPrimaryDark"
                android:textSize="18sp" />


        </LinearLayout>

        <LinearLayout
            android:id="@+id/LinearLayout02"
            android:layout_height="80dp"
            android:layout_width="match_parent"

            android:gravity="center">

            <Button
                android:id="@+id/Button02"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Clear">
            </Button>

            <Button
                android:id="@+id/Button03"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_weight="1"
                android:text="Payment">
            </Button>
        </LinearLayout>
    </LinearLayout>

    <LinearLayout
        android:layout_width="500dp"
        android:layout_height="match_parent"
        android:layout_weight="1"
        android:orientation="vertical"
        android:background="#f4efef"
        android:gravity="center_horizontal">


            <EditText
                android:id="@+id/edtSearch"
                android:layout_width="732dp"
                android:layout_height="wrap_content"
                android:inputType="text"
                android:imeOptions="actionSearch"
                android:hint="Search for Item"
                android:gravity="center_horizontal"/>


        <fragment
            android:id="@+id/catframe"
            android:name ="com.sipconsult.golfpos.CategoryList"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:layout="@layout/categoryframe">

        </fragment>

    </LinearLayout>

</LinearLayout>

this is category frame

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    tools:context="com.sipconsult.golfpos.CategoryList"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <TextView
        android:id="@+id/txt1"
        android:layout_width="wrap_content"
        android:layout_height="match_parent"
        android:text="Price"
        android:textAlignment="center"
        android:layout_weight="2"
        android:textSize="16sp"/>

    <android.support.v7.widget.RecyclerView
        android:layout_below="@id/txt1"
        android:id="@+id/categoryrecycler"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:columnWidth="90dp"
        android:gravity="center"
        android:horizontalSpacing="10dp"
        android:numColumns="auto_fit"
        android:stretchMode="columnWidth"
        android:verticalSpacing="10dp">
    </android.support.v7.widget.RecyclerView>
</LinearLayout>

this is categorylist

<android.support.v7.widget.CardView
    xmlns:card_view="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/cardview"
    android:layout_width="250dp"
    android:layout_height="250dp"
    card_view:cardUseCompatPadding="true"
    card_view:cardCornerRadius="10dp"
    android:layout_margin="10dp">

    <RelativeLayout
        android:layout_width="278dp"
        android:layout_height="233dp">

        <ImageView
            android:id="@+id/categoryimage"
            android:layout_width="250dp"
            android:layout_height="200dp"

            android:src="@drawable/three"
            android:scaleType="centerCrop"
            android:layout_alignParentTop="true"
            android:layout_alignParentStart="true"
            android:contentDescription=""
            tools:ignore="ContentDescription"/>

        <TextView
            android:id="@+id/categoryname"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_alignParentBottom="true"
            android:layout_below="@+id/categoryimage"
            android:background="@color/cardview_light_background"
            android:textAlignment="center"
            android:paddingBottom="8dp"
            android:paddingTop="8dp"
            android:text="Categoryname"
            android:textColor="@color/cardview_dark_background"
            android:textSize="14sp" />

    </RelativeLayout>

</android.support.v7.widget.CardView>

this is listviewwithimage

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:elevation="1dp">

    <ImageView
        android:id="@+id/imageView"
        android:layout_width="200dp"
        android:layout_height="200dp"

        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:layout_margin="15dp"
        android:contentDescription="null" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginLeft="15dp"
        android:gravity="center"
        android:text="New Text"
        tools:ignore="RtlHardcoded"
        android:layout_alignEnd="@+id/imageView"
        android:layout_alignStart="@+id/imageView"
        android:layout_below="@+id/imageView" />
</RelativeLayout>

this is ItemObject

public class ItemObject {
    private String Category_Name;
    private String Image;
    private int Id;

    public ItemObject(int id, String name, String image) {
        this.Id = id;
        this.Category_Name = name;
        this.Image = image;

    }
    public int getId() {
        return Id;
    }

    public void setId(int id) {
        Id = id;
    }

    public String getCategory_Name() {
        return Category_Name;
    }

    public void setCategory_Name(String name) {
        Category_Name = name;
    }

    public String getImage() {
        return Image;
    }


    public void setImage(String image) {
        Image = image;
    }

this is categorylistrecycleradapter

public class CategorylistRecyclerAdapter extends RecyclerView.Adapter<CategorylistViewHolders>{
    private ArrayList<ItemObject> itemList;
    private Context context;

    public CategorylistRecyclerAdapter(Context context, ArrayList<ItemObject> itemList) {
        this.itemList = itemList;
        this.context = context;
    }

    @Override
    public CategorylistViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {

        View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.categorylist, parent, false);
        CategorylistViewHolders rcv = new CategorylistViewHolders(layoutView);
        return rcv;
    }

    @Override
    public void onBindViewHolder(CategorylistViewHolders holder, int position) {

        holder.categoryname.setText(itemList.get(position).getCategory_Name());
        holder.categoryimage.setImageResource(Integer.parseInt(itemList.get(position).getImage()));
    }

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

this is categorylistviewholder

public class CategorylistViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener{

    public TextView categoryname;
    public ImageView categoryimage;

    public CategorylistViewHolders(View itemView) {
        super(itemView);
        itemView.setOnClickListener(this);
        categoryname = (TextView)itemView.findViewById(R.id.categoryname);
        categoryimage = (ImageView)itemView.findViewById(R.id.categoryimage);
    }

    @Override
    public void onClick(View view) {
        Toast.makeText(view.getContext(), "Clicked Category = " + getPosition(), Toast.LENGTH_SHORT).show();
    }
}

this is categorylist java,loads the list from api

public class CategoryList extends Fragment {
    private GridLayoutManager gridLayout;
    private static String URL = "http:xxx";
    private  static  String Image_URL= "http:xxx";
    private ArrayList<ItemObject> List;
    private RecyclerView recyclerView;

    private CategorylistRecyclerAdapter rcAdapter;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // TODO Auto-generated method stub

        View view = inflater.inflate(R.layout.categoryframe, container, false);


        gridLayout = new GridLayoutManager(getActivity(),3);
        recyclerView = (RecyclerView) view.findViewById(R.id.categoryrecycler);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(gridLayout);

        List = new ArrayList<>();

        loadRecyclerViewData();
        return view;


    }

    /*@Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        text = (TextView)view.findViewById(R.id.txt1);

        gridLayout = new GridLayoutManager(getActivity(),3);
        recyclerView = (RecyclerView) view.findViewById(R.id.categoryrecycler);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(gridLayout);

        List = new ArrayList<>();
        text.setText("Hello world");
        loadRecyclerViewData();


    }*/

    public void onActivityCreated(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onActivityCreated(savedInstanceState);

    }

    private void loadRecyclerViewData() {
        final ProgressDialog progressDialog = new ProgressDialog(getActivity());
        progressDialog.setMessage("Loading....");
        progressDialog.show();

        StringRequest stringRequest = new StringRequest(Request.Method.GET, URL,

                new Response.Listener<String>() {
                    @Override
                    public void onResponse(String s) {
                        progressDialog.dismiss();
                        try {
                            JSONObject jsonObject = new JSONObject(s);
                            JSONArray jsonArray = jsonObject.getJSONArray("Model");
                            //int[] images = getImg();
                            for (int i = 0; i < jsonArray.length(); i++) {
                                JSONObject p = jsonArray.getJSONObject(i);
                                ItemObject list = new ItemObject
                                        (
                                        p.getInt("CategoryId"),
                                        p.getString("Category_Name"),
                                        p.getString(Image_URL + "Image")

                                );
                                List.add(list);
                            }
                             rcAdapter = new CategorylistRecyclerAdapter(getActivity(),List);
                            recyclerView.setAdapter(rcAdapter);


                        } catch (JSONException e) {
                            e.printStackTrace();
                        }
                    }

                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {

                    }
                }
        );
        RequestQueue requestQueue = Volley.newRequestQueue(getActivity());
        requestQueue.add(stringRequest);
    }
}

this is main activity,it is supposed to load categorylist as a fragment where i can manipulate with data

public class MainActivity extends AppCompatActivity{

    CategoryList ct;
    FragmentTransaction transaction;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        ct = new CategoryList();

        FragmentManager manager=getSupportFragmentManager();
        transaction=manager.beginTransaction();
        transaction.add(R.id.catframe, ct, "Frag_Top");
        transaction.commit();
        /*if (getFragmentManager().findFragmentById(R.id.catframe) == null) {
            getFragmentManager().beginTransaction().add(R.id.catframe,ct,"Fragment One" ).commit();
        }*/

    }
       /* ct = new CategoryList();

       final  FragmentManager fragmentManager = getFragmentManager();
         transaction = fragmentManager.beginTransaction();
        transaction.add(R.id.catframe,ct,"Fragment one");
        transaction.commit();*/


    }