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How do I insert data from MySQL into Gridview on Fragments? I've tried it with a coding method used for Activity. I've changed a lot but it's still wrong. This is my coding:

/**
 * A simple @link Fragment subclass.
 */
public class Product extends Fragment implements 
SwipeRefreshLayout.OnRefreshListener 

GridView grid_product;
SwipeRefreshLayout swipe;

List<ProductData> newsList = new ArrayList<ProductData>();

private static final String TAG = Product.class.getSimpleName();

private static String url_list = Server.URL + "news.php?offset=";

private int offSet = 0;

int no;

ProductAdapter adapter;

public static final String TAG_NO = "no";
public static final String TAG_ID = "id";
public static final String TAG_JUDUL = "judul";
public static final String TAG_TGL = "tgl";
public static final String TAG_ISI = "isi";
public static final String TAG_GAMBAR = "gambar";

Handler handler;
Runnable runnable;


public Product() 
 // Required empty public constructor



@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
 Bundle savedInstanceState) 
 // Inflate the layout for this fragment
 View view = inflater.inflate(R.layout.fragment_product, container, false);
 swipe = (SwipeRefreshLayout) view.findViewById(R.id.swipe_refresh_layout);
 grid_product = (GridView) view.findViewById(R.id.grid_product);
 setProduct();

 return view;


private void setProduct()


 adapter = new ProductAdapter(getActivity(), newsList);
 grid_product.setAdapter(adapter);
 grid_product.setOnItemClickListener(new AdapterView.OnItemClickListener() 
 @Override
 public void onItemClick(AdapterView<?> parent, View view, int position, long id) 
 //pindah activity
 startActivity(new Intent(
 getActivity(), DetailActivity.class
 ));

 
 );

I don't know where the mistake is:

 swipe.setOnRefreshListener(this);

 swipe.post(new Runnable() 
 @Override
 public void run() 
 swipe.setRefreshing(true);
 newsList.clear();
 adapter.notifyDataSetChanged();
 callNews(0);
 
 
 );

 grid_product.setOnScrollListener(new AbsListView.OnScrollListener() 

 private int currentVisibleItemCount;
 private int currentScrollState;
 private int currentFirstVisibleItem;
 private int totalItem;

 @Override
 public void onScrollStateChanged(AbsListView view, int scrollState) 
 this.currentScrollState = scrollState;
 this.isScrollCompleted();
 

 @Override
 public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) 
 this.currentFirstVisibleItem = firstVisibleItem;
 this.currentVisibleItemCount = visibleItemCount;
 this.totalItem = totalItemCount;
 

 private void isScrollCompleted() 
 if (totalItem - currentFirstVisibleItem == currentVisibleItemCount
 && this.currentScrollState == SCROLL_STATE_IDLE) 

 swipe.setRefreshing(true);
 handler = new Handler();

 runnable = new Runnable() 
 public void run() 
 callNews(offSet);
 
 ;

 handler.postDelayed(runnable, 3000);
 
 

 );



@Override
public void onRefresh() 
 newsList.clear();
 adapter.notifyDataSetChanged();
 callNews(0);

I don't know where the mistake is:

private void callNews(int page)

 swipe.setRefreshing(true);

 // Creating volley request obj
 JsonArrayRequest arrReq = new JsonArrayRequest(url_list + page,
 new Response.Listener<JSONArray>() 
 @Override
 public void onResponse(JSONArray response) 
 Log.d(TAG, response.toString());

 if (response.length() > 0) 
 // Parsing json
 for (int i = 0; i < response.length(); i++) 
 try 

 JSONObject obj = response.getJSONObject(i);
 ProductData news = new ProductData();

 no = obj.getInt(TAG_NO);

 news.addId(obj.getString(TAG_ID));
 news.addJudul(obj.getString(TAG_JUDUL));

 if (obj.getString(TAG_GAMBAR) != "") 
 news.addGambar(obj.getString(TAG_GAMBAR));
 

 news.addDatetime(obj.getString(TAG_TGL));
 news.addIsi(obj.getString(TAG_ISI));

 // adding news to news array
 newsList.add(news);

 if (no > offSet)
 offSet = no;

 Log.d(TAG, "offSet " + offSet);

 catch (JSONException e) 
 Log.e(TAG, "JSON Parsing error: " + e.getMessage());
 

 // notifying list adapter about data changes
 // so that it renders the list view with updated data
 adapter.notifyDataSetChanged();
 
 
 swipe.setRefreshing(false);
 

 , new Response.ErrorListener() 

 @Override
 public void onErrorResponse(VolleyError error) 
 VolleyLog.d(TAG, "Error: " + error.getMessage());
 swipe.setRefreshing(false);
 
 );

 // Adding request to request queue
 AppController.getInstance().addToRequestQueue(arrReq);