试试这个：
public class home extends AppCompatActivity {
//a list to store all the products
List<Product> productList;
//the recyclerview
RecyclerView recyclerView;
adepter a;
ProgressBar Pbar;
GridLayoutManager manager;
int token = 1;
Boolean isScrolling = false;
int currentItems, totalItems, scrollOutItems;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
Pbar = findViewById(R.id.progressBar1);
//getting the recyclerview from xml
recyclerView = findViewById(R.id.recylcerView);
recyclerView.setHasFixedSize(true);
manager = new GridLayoutManager(this, 2);
recyclerView.setLayoutManager(manager);
//initializing the productlist
productList = new ArrayList<>();
a = new adepter(home.this, productList);
recyclerView.setAdapter(a);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if(newState == AbsListView.OnScrollListener.SCROLL_STATE_TOUCH_SCROLL)
{
isScrolling = true;
}
}
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
currentItems = manager.getChildCount();
totalItems = manager.getItemCount();
scrollOutItems = manager.findFirstVisibleItemPosition();
if(isScrolling && (currentItems + scrollOutItems == totalItems))
{
isScrolling = false;
token++;
getData();
}
}
});
getData();
}
private void getData(){
String url = "https://shop.com/index.PHP";
url = url+ "&pg="+ String.valueOf(token);
Pbar.setVisibility(View.VISIBLE);
StringRequest stringRequest = new StringRequest(Request.Method.GET, url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
// Toast.makeText(getApplicationContext(),"volly ok ",Toast.LENGTH_LONG).show();
try {
//converting the string to json array object
JSONArray array = new JSONArray(response);
//traversing through all the object
for (int i = 0; i < array.length(); i++) {
//getting product object from json array
JSONObject product = array.getJSONObject(i);
//adding the product to product list
productList.add(new Product(
product.getInt("id"),
product.getString("title"),
product.getString("shortdesc"),
product.getString("type"),
product.getString("price"),
product.getString("image")
));
}
a.notifyDataSetChanged();
Pbar.setVisibility(View.GONE);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), "Server Error" ,Toast.LENGTH_LONG).show();
}
});
//adding our stringrequest to queue
Volley.newRequestQueue(this).add(stringRequest);
}
}
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