Develop Reference

scroll pagination with Laravel API

I am using Laravel API with paginated data in Android...
I want to get auto paginated data.
e.g. data on first page load first and when I scroll down, next pages load continously!

You can use laravel default pagination method instate of get rows.
For example i want show users list:
//instate of :
$users = User::get();
//Use :
$users = User::paginate();
more info at : laravel site
https://laravel.com/docs/5.5/pagination

You can do so easily using the LengthAwarePaginator
protected function paginate(Collection $collection)
{
$rules = [
'per_page' => 'integer|min:2|max:50',
];
Validator::validate(request()->all(), $rules);
$page = LengthAwarePaginator::resolveCurrentPage();
$perPage = 15;
if (request()->has('per_page')) {
$perPage = (int) request()->per_page;
}
$results = $collection->slice(($page - 1) * $perPage, $perPage)->values();
$paginated = new LengthAwarePaginator($results, $collection->count(), $perPage, $page, [
'path' => LengthAwarePaginator::resolveCurrentPath(),
]);
$paginated->appends(request()->all());
return $paginated;
}
Make sure you import all the namespaces needed,
You can go ahead and paginate the collection thus
$collection = $this->paginate($collection);
Hope this helps

On Laravel Side
// Get Collection
$query = SomeModel::where('some_thing', "5")
->paginate(10);
return Response::json(array(
'some_result' => $query,
));
On Android Side (Retrofit Call)
#FormUrlEncoded
#POST
Call<JsonObject> getActions(
#Url String url);
On Android Side (Activity/Fragment)
public class NewTemplateActivity
extends AppCompatActivity {
// Recycler View
private SomeActionListAdapter someActionsAdapter;
private List<SomesomeActionListModel> listSomeActionModel;
private RecyclerView rv;
private Boolean isScrolling = false;
private int currentItems, totalItems, scrollOutItems;
private int pageNumber = 1;
private Boolean firstLoad = true;
private Boolean firstSearch = false;
private LinearLayoutManager manager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
// Init Recycler View
rv = findViewById(R.id.f_list_rv_list);
rv.setHasFixedSize(true);
listSomeActionModel = new ArrayList<>();
someActionsAdapter = new SomeActionListAdapter(
mContext,
listSomeActionModel);
manager = new LinearLayoutManager(mContext);
rv.setLayoutManager(manager);
rv.setAdapter(someActionsAdapter);
}
private void getSomeAction(
String url) {
if (firstLoad || firstSearch) {
listSomeActionModel.clear();
}
// Retrofit Call
Call<JsonObject> call = RetrofitClientLaravel.getInstance(mContext)
.discussGetApi()
.getSomeAction(url);
call.enqueue(new Callback<JsonObject>() {
#Override
public void onResponse(
Call<JsonObject> call,
Response<JsonObject> response) {
JSONObject jsonObject;
try {
jsonObject = new JSONObject(new Gson().toJson(response.body()));
// Get The Relevant Array
JSONObject jsonObject2 = jsonObject.getJSONObject("some_result");
JSONArray returnArray = jsonObject2.getJSONArray("data");
onScrolled();
if (!returnArray.isNull(0)) {
for (int l = 0; l < returnArray.length(); l++) {
if (returnArray.length() > 0) {
// Get The Json Object
JSONObject returnJSONObject = returnArray.getJSONObject(l);
// Get Details
String id = returnJSONObject.optString("SomesomeAction_id");
// Populate The Array List
listSomeActionModel.add(new SomesomeActionListModel(id));
}
}
}
if (firstLoad || firstSearch) {
someActionsAdapter = new SomeActionListAdapter(
mContext,
listSomeActionModel);
rv.setAdapter(someActionsAdapter);
}
someActionsAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
#Override
public void onFailure(
Call<JsonObject> call,
Throwable t) {
}
});
}
public void onScrolled() {
rv.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;
firstLoad = false;
firstSearch = false;
Toast.makeText(
mContext,
"Loading More...",
Toast.LENGTH_SHORT)
.show();
pageNumber++;
getSomeAction(Env.LARAVEL_MAIN_URL +
"/api/get_SomesomeActions" +
"?page=" +
pageNumber);
}
}
});
}
}

RecyclerView chat load more items from top

I am trying to implement pagination in recyclerview to load more chat messages when the user scrolls to top , this is achieved by sending the last message time i.e coversations[0] time to the API , but when the new list is added the old List gets repeated many times . I think this is because i am not updating the time properly , What is the correct way to achieve this?
This is the code i am using, first time i am setting the flag to false and time as empty.
getConvoData(k, " ", "", false);
private String last_msg_time = " ";
private Boolean flag = false;
rv_convo.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
if (!recyclerView.canScrollVertically(-1)) {
if (conversations != null) {
String time = last_msg_time;
getConvoData(k, " ", time, true);
}
}
}
});
this is the method for fetching conversation Data
private void getConvoData(final String k, final String new_message, final String last_time, final boolean flag) {
final String token1 = Global.shared().tb_token;
final String url = "https://app.aer.media/v2/message_router/_getChat";
final JSONObject jsonBody = new JSONObject();
final ProgressDialog progressDialog = new ProgressDialog(this);
final String mRequestBody = jsonBody.toString();
StringRequest stringRequest = new StringRequest(Request.Method.POST, url, new com.android.volley.Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jObj = new JSONObject(response);
final JSONObject data = jObj.getJSONObject("data");
conversations = data.getJSONArray("conversation");
JSONObject for_chat = data.getJSONObject("for_chat");
JSONArray jsonArr_chat = new JSONArray();
jsonArr_chat.put(for_chat);
params = (RelativeLayout.LayoutParams) rv_convo.getLayoutParams();
GsonBuilder gsonBuilder = new GsonBuilder();
Gson gson = gsonBuilder.create();
if (!flag) {
convobeans = gson.fromJson(conversations.toString(), convType);
last_msg_time = conversations.getJSONObject(0).getString("time");
Log.d("OldList", convobeans.toString());
adapter = new ChatDetailsAdapter(forChatBeen, convobeans, ChatDetailsActivity.this, forChatBeansList, image, name, initials, new_message, bitmap);
// Collections.reverse(convobeans);
rv_convo.setAdapter(adapter);
rv_convo.smoothScrollToPosition( rv_convo.getAdapter().getItemCount() - 1);
adapter.notifyDataSetChanged();
rv_convo.setNestedScrollingEnabled(true);
} else {
newConvo = gson.fromJson(conversations.toString(), convType);
last_msg_time = conversations.getJSONObject(0).getString("time");
if (newConvo != null && newConvo.size() > 0) {
Log.d("newList", newConvo.toString());
convobeans.addAll(0, newConvo);
adapter.notifyItemChanged(0, newConvo.size());
}
}
}
}
}
Depending on the flag I am updating the list and updating the time as well but the list gets repeated in the RecyclerView due to the previous time being passed , how do I update the time optimally and fetch the new list each time?

This code is used to fetch the data when the user scroll down in a recylerview. Just analyze this code you will get the basic idea.
rvCategory.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (dy > 0) {
visibleItemCount = mLinearLayoutManager.getChildCount();
totalItemCount = mLinearLayoutManager.getItemCount();
pastVisiblesItems = mLinearLayoutManager.findFirstVisibleItemPosition();
if (loading) {
if ((visibleItemCount + pastVisiblesItems) >= totalItemCount) {
loading = false;
fetchData();
}
}
}
}
});
Function FetchData()
private void fetchData() {
String url = EndPoints.location + "getMobileData.php?lastData=" + lastData;
JsonObjectRequest jsObjRequest = new JsonObjectRequest
(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
lastData = response.getString("last");
JSONArray jArray = response.getJSONArray("response");
if (jArray.length() == 0) {
//Empty condition
} else {
for (int i = 0; i < jArray.length(); i++) {
//Append the chat with the Dataobject of your modelAnd swap the recylerview view with new data
//Example
}
adapter.swap(rvHomeModel.createHomeList(DataPathsHome, true));
}
} catch (JSONException e) {
e.printStackTrace();
}
loading = true;
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
loading = true;
Toast.makeText(CategoryView.this, "No internet connection", Toast.LENGTH_LONG).show();
}
});
// Add a request (in this example, called stringRequest) to your RequestQueue.
MySingleton.getInstance(this).addToRequestQueue(jsObjRequest);
}
Create a function called swap in your adapter class that accept the new dataset
public void swap(List<rvHomeModel> list) {
//Check your previouse dataset used in adapter is empty or not
if (rvHomeModels!= null) {
rvHomeModels.clear();
rvHomeModels.addAll(list);
} else {
rvHomeModels = list;
}
notifyDataSetChanged();
}
At server
1. Get the previous value
2. Do the database operation and get the chats id < of previous
2. Create a JSON Object contain
{
last:last_chat_id,
response:{
//Your chat
}
}
This is not a perfect solution for this question. But you will get the basic idea about what you are looking for.

RecyclerView already scrolled to bottom when activity starts

I have fragments with RecyclerView in my activity, But whenever I start the fragment, the RecyclerView is already scrolled to the bottom. To load more item, user have to scroll a little bit upwards and then scroll back to the bottom, And when more items load, RecyclerView is again scrolled to the new bottom.
Here is the code in fragment.
public class FavouriteFragment extends Fragment{
public RecyclerView recyclerView ;
public RecyclerView.Adapter adapter ;
public LinearLayoutManager layoutManager ;
int pastVisiblesItems, visibleItemCount, totalItemCount;
Constants constants;
ArrayList<CardSetterGetter> arrayList;
private List<CardSetterGetter> imagelist;
int start ;
public int end ;
boolean loading = true ;
int totalcount ;
ArrayList<String> imageNameArray ;
String androidId;
String categoryName ;
String cateGoryFlag = "false";
String url;
String tagname = "";
ArrayList<String> title ;
ProgressBar progressBar ;
TextView errormsg ;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//to hide search
setHasOptionsMenu(true);
}
#Override
public void onPrepareOptionsMenu(Menu menu) {
MenuItem item = menu.findItem(R.id.search);
item.setVisible(false);
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.favourite_fragment,container,false);
arrayList = new ArrayList<CardSetterGetter>();
imageNameArray = new ArrayList<String>();
start = 0;
end = start + 2 ;
imagelist = new ArrayList<CardSetterGetter>();
recyclerView = (RecyclerView)view.findViewById(R.id.recyclerview);
progressBar = (ProgressBar)view.findViewById(R.id.progressBar);
errormsg = (TextView) view.findViewById(R.id.error);
getdata();
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if(dy > 0)
{
visibleItemCount = layoutManager.getChildCount();
totalItemCount = layoutManager.getItemCount();
pastVisiblesItems = layoutManager.findFirstVisibleItemPosition();
int i = visibleItemCount + pastVisiblesItems ;
System.out.println(i);
System.out.println(totalItemCount);
if(loading) {
if (i == totalItemCount) {
loading = false ;
start = arrayList.size() ;
end = arrayList.size() + 2 ;
requestWithSomeHttpHeaders2(start,end);
new Handler().postDelayed(new Runnable() { // This thread runs in the UI
#Override
public void run() {
loading = true;
}
},2000);
}
}
}
}
});
requestWithSomeHttpHeaders2(start, end);
return view ;
}
public void requestWithSomeHttpHeaders2(int s , int e) {
RequestQueue queue = Volley.newRequestQueue(getActivity());
url = "my url";
StringRequest postRequest = new StringRequest(Request.Method.GET, url ,
new Response.Listener<String> ()
{
#Override
public void onResponse(String response) {
try {
progressBar.setVisibility(View.GONE);
JSONObject jsonObject = new JSONObject(response);
JSONArray payload = jsonObject.getJSONArray("Payload");
JSONObject MetaData = jsonObject.getJSONObject("MetaData");
System.out.println(response);
totalcount = MetaData.getInt("TotalCount");
System.out.println("200" + " " + totalcount);
System.out.println("payload length"+payload.length());
int i ;
for(i =0 ; i < payload.length() ; i++)
{
System.out.println(payload.getJSONObject(i).getString("image_title"));
System.out.println(payload.getJSONObject(i).getString("image_title"));
System.out.println(payload.getJSONObject(i).getString("image_file"));
System.out.println(payload.getJSONObject(i).getString("image_description"));
System.out.println(payload.getJSONObject(i).getString("image_category"));
System.out.println(payload.getJSONObject(i).getString("image_tags"));
System.out.println(payload.getJSONObject(i).getString("id"));
System.out.println(payload.getJSONObject(i).getString("favourite"));
String newString = payload.getJSONObject(i).getString("image_file").replace("original_image", "thumbnail");
CardSetterGetter all = new CardSetterGetter(payload.getJSONObject(i).getString("image_file"),
payload.getJSONObject(i).getString("image_title"),
payload.getJSONObject(i).getString("image_description"),
payload.getJSONObject(i).getString("image_category"),
payload.getJSONObject(i).getString("image_tags"),
payload.getJSONObject(i).getString("id"),
payload.getJSONObject(i).getString("favourite"));
System.out.println("i value is " + i);
arrayList.add(all);
Handler handler = new Handler();
final Runnable r = new Runnable() {
public void run() {
adapter = new RecyclerViewAdapter(getActivity(),arrayList,imageNameArray,totalItemCount);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
//adapter.notifyItemInserted(arrayList.size() - 1);
if (end >= totalcount)
{
int index = totalcount -1 ;
recyclerView.scrollToPosition(index);
}
else {
recyclerView.scrollToPosition(end);
}
}
};
handler.post(r);
}
} catch (Exception e) {
e.printStackTrace();
System.out.println("error" + e);
}
}
},
new Response.ErrorListener()
{
#Override
public void onErrorResponse(VolleyError error) {
// TODO Auto-generated method stub
Log.d("ERROR","error => "+error.toString());
// definitions.setText("check your internet connection");
NetworkResponse networkResponse = error.networkResponse;
// Log.e("Volley", "Error. HTTP Status Code:"+networkResponse.statusCode);
if (networkResponse != null) {
Log.e("Volley", "Error. HTTP Status Code:"+networkResponse.statusCode);
}
if (error instanceof TimeoutError) {
Log.e("Volley", "TimeoutError");
}else if(error instanceof NoConnectionError){
Log.e("Volley", "NoConnectionError");
} else if (error instanceof AuthFailureError) {
Log.e("Volley", "AuthFailureError");
} else if (error instanceof ServerError) {
Log.e("Volley", "ServerError");
} else if (error instanceof NetworkError) {
Log.e("Volley", "NetworkError");
} else if (error instanceof ParseError) {
Log.e("Volley", "ParseError");
}
}
}
);
queue.add(postRequest);
}
public void getdata(){
try {
SharedPreferences sharedPref = getActivity().getSharedPreferences("mobileId" , Context.MODE_PRIVATE);
androidId = sharedPref.getString("mobileId" , "");
sharedPref = getActivity().getSharedPreferences("categoryInfo" , Context.MODE_PRIVATE);
categoryName = sharedPref.getString("categoryName" , "");
cateGoryFlag = sharedPref.getString("categoryFlag" , "");
tagname = sharedPref.getString("tagname" , "");
}catch (Exception e){
}
}
}
I tried removing if else part of the code, but that made the recyclerView scroll to the top whenever user reach the bottom of the recyclerView.
Please tell me if you need more of the code or code of RecyclerViewAdapter.

I fixed a similar problem by providing the correct orientation to the layout manager. I would change your code to something like:
public RecyclerView.Adapter adapter ;
adapter = new RecyclerViewAdapter(getActivity(),arrayList,imageNameArray,totalItemCount);
recyclerView.setHasFixedSize(true);
//This line should do the trick:
//first parameter is the context
//second parameter is the orientation
//third parameter is used for reverse layout (if you need to show items from last to first)
layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
//probably better to use notifyDataSetChanged to let the adapter know you just initialized it (instead of notifying a single element)
adapter.notifyDataSetChanged();
Not sure why you provide the total item count to the adapter as well, but that's outside the scope of the question and surely doesn't give any problems.
EDIT:
Now that you posted the whole fragment code, I am seeing at least a couple problems:
- the RecyclerView initialization should not be in a runnable, but in the onCreateView or some starting function. You just need to set the manager and the adapter once.
- You provide imageNameArray to your adapter, but where are you inserting new items into it? If you want your RecyclerView to scroll down to the last inserted item, you first need to add an item to the ArrayList, then notify the insertion at that position, something like this:
int position = imageNameAray.size();
imageNameArray.add(item);
adapter.notifyItemInserted(position); //this makes the view update the item in that position, making the recycler to scroll there

Pagination doesn't work properly on list Scroll view

Following code is used for getting the new data from json on scroll of list view . But after getting the new json it does not add the new one from json instead it takes the same data that are in the first json .
Please Help me with this issue .
My Activity .
public class ProductView extends AppCompatActivity {
ListView list_product;
String json;
ProgressActivity loadingview;
int current_page = 1;
int totalPage = 1;
int Pagecount = 1;
Toolbar toolbar;
GetProductAdapter productAdapter;
List<BeanGetProducts> beanGetProductses = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_view);
toolbar = (Toolbar) findViewById(R.id.back_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed();
}
});
ImageView img_home = (ImageView) findViewById(R.id.dr_image_home);
img_home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(ProductView.this, AdminAccess.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
}
});
list_product = (ListView) findViewById(R.id.list_products);
productAdapter = new GetProductAdapter(beanGetProductses, ProductView.this, getApplicationContext());
list_product.setOnScrollListener(new AbsListView.OnScrollListener() {
#Override
public void onScrollStateChanged(AbsListView absListView, int i) {
}
#Override
public void onScroll(AbsListView absListView, int firstItem, int visibleItemCount, int totalItem) {
int total = firstItem + visibleItemCount;
if (Pagecount < totalPage) {
if (total == totalItem) {
Pagecount++;
new getProducts(Pagecount).execute();
productAdapter.notifyDataSetChanged();
list_product.setAdapter(productAdapter);
}
}
}
});
new getProducts(current_page).execute();
}
public class getProducts extends AsyncTask<Void, Void, String> {
int pageNo;
public getProducts(int pageNo) {
this.pageNo = pageNo;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
try {
loadingview = new ProgressActivity(ProductView.this, "");
loadingview.setCancelable(false);
loadingview.show();
} catch (Exception e) {
}
}
#Override
protected String doInBackground(Void... voids) {
List<NameValuePair> pairs = new ArrayList<>();
pairs.add(new BasicNameValuePair("", String.valueOf(pageNo)));
json = new ServiceHandler().makeServiceCall(GlobalLinks.mainLink + GlobalLinks.productDetails, ServiceHandler.POST, pairs);
Log.e("Parameters", "" + pairs);
return json;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loadingview.dismiss();
System.out.println(s);
try {
if (!Internet.isConnectingToInternet(getApplicationContext())) {
Internet.noInternet(getApplicationContext());
} else {
if (s.equalsIgnoreCase(null) || s.equalsIgnoreCase("") || s.equalsIgnoreCase("null") || s.length() == 0) {
GlobalUse.nullJSON(getApplicationContext());
} else {
JSONObject mainObject = new JSONObject(s);
boolean status = mainObject.getBoolean("status");
String message = mainObject.getString("message");
totalPage = mainObject.getInt("total_page");
Log.e("total_page", "" + totalPage);
Toast.makeText(getApplicationContext(), "" + message, Toast.LENGTH_LONG).show();
if (status == true) {
JSONArray dataArray = mainObject.getJSONArray("data");
for (int i = 0; i < dataArray.length(); i++) {
JSONObject object = dataArray.getJSONObject(i);
JSONObject getProductObject = object.getJSONObject("GetProduct");
BeanGetProducts getProducts = new BeanGetProducts();
getProducts.setProduct_id(getProductObject.getString("product_id"));
getProducts.setImage(getProductObject.getString("image"));
getProducts.setSku(getProductObject.getString("sku"));
getProducts.setQuantity(getProductObject.getString("quantity"));
getProducts.setPrice(getProductObject.getString("price"));
getProducts.setStock_status_id(getProductObject.getString("stock_status_id"));
JSONObject product_description = object.getJSONObject("Product_Description");
getProducts.setName(product_description.getString("name"));
getProducts.setDescription(product_description.getString("description"));
JSONObject SpecialPrice = object.getJSONObject("SpecialPrice");
getProducts.setSpecialPrice(SpecialPrice.getString("price"));
beanGetProductses.add(getProducts);
}
// productAdapter = new GetProductAdapter(beanGetProductses, ProductView.this, getApplicationContext());
productAdapter.notifyDataSetChanged();
list_product.setAdapter(productAdapter);
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
public void onBackPressed() {
Intent intent = new Intent(getApplicationContext(), AdminAccess.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
}

Crate a new class named as EndlessScrollListener
import android.widget.AbsListView;
public abstract class EndlessScrollListener implements AbsListView.OnScrollListener {
// The minimum number of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 5;
// The current offset index of data you have loaded
private int currentPage = 0;
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
// Sets the starting page index
private int startingPageIndex = 0;
public EndlessScrollListener() {
}
public EndlessScrollListener(int visibleThreshold) {
this.visibleThreshold = visibleThreshold;
}
public EndlessScrollListener(int visibleThreshold, int startPage) {
this.visibleThreshold = visibleThreshold;
this.startingPageIndex = startPage;
this.currentPage = startPage;
}
#Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount)
{
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
if (totalItemCount < previousTotalItemCount) {
this.currentPage = this.startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0) { this.loading = true; }
}
// If it's still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading && (totalItemCount > previousTotalItemCount)) {
loading = false;
previousTotalItemCount = totalItemCount;
currentPage++;
}
// If it isn't currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
if (!loading && (firstVisibleItem + visibleItemCount + visibleThreshold) >= totalItemCount ) {
loading = onLoadMore(currentPage + 1, totalItemCount);
}
}
// Defines the process for actually loading more data based on page
// Returns true if more data is being loaded; returns false if there is no more data to load.
public abstract boolean onLoadMore(int page, int totalItemsCount);
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// Don't take any action on changed
}
}
Then change your code as below.
The pagecount which you are passing in you asynctask is actually the size of a list. So you can update this variable this after laoding data from the network.
public class ProductView extends AppCompatActivity {
ListView list_product;
String json;
ProgressActivity loadingview;
int Pagecount = 0
Toolbar toolbar;
GetProductAdapter productAdapter;
List<BeanGetProducts> beanGetProductses = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_product_view);
toolbar = (Toolbar) findViewById(R.id.back_toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setHomeButtonEnabled(true);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onBackPressed();
}
});
ImageView img_home = (ImageView) findViewById(R.id.dr_image_home);
img_home.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(ProductView.this, AdminAccess.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
finish();
}
});
list_product = (ListView) findViewById(R.id.list_products);
productAdapter = new GetProductAdapter(beanGetProductses, ProductView.this, getApplicationContext());
// Load first time data and insert into list.
new getProducts(Pagecount).execute();
list_product.setOnScrollListener(new EndlessScrollListener() {
#Override
public boolean onLoadMore(int page, int totalItemsCount) {
// Triggered only when new data needs to be appended to the list
// Add whatever code is needed to append new items to your AdapterView
new getProducts(Pagecount).execute();
// or loadNextDataFromApi(totalItemsCount);
return true; // ONLY if more data is actually being loaded; false otherwise.
}
});
}
public class getProducts extends AsyncTask<Void, Void, String> {
int pageNo;
public getProducts(int pageNo) {
this.pageNo = pageNo;
}
#Override
protected void onPreExecute() {
super.onPreExecute();
try {
loadingv
iew = new ProgressActivity(ProductView.this, "");
loadingview.setCancelable(false);
loadingview.show();
} catch (Exception e) {
}
}
#Override
protected String doInBackground(Void... voids) {
List<NameValuePair> pairs = new ArrayList<>();
pairs.add(new BasicNameValuePair("", String.valueOf(pageNo)));
json = new ServiceHandler().makeServiceCall(GlobalLinks.mainLink + GlobalLinks.productDetails, ServiceHandler.POST, pairs);
Log.e("Parameters", "" + pairs);
return json;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
loadingview.dismiss();
System.out.println(s);
try {
if (!Internet.isConnectingToInternet(getApplicationContext())) {
Internet.noInternet(getApplicationContext());
} else {
if (s.equalsIgnoreCase(null) || s.equalsIgnoreCase("") || s.equalsIgnoreCase("null") || s.length() == 0) {
GlobalUse.nullJSON(getApplicationContext());
} else {
JSONObject mainObject = new JSONObject(s);
boolean status = mainObject.getBoolean("status");
String message = mainObject.getString("message");
totalPage = mainObject.getInt("total_page");
Log.e("total_page", "" + totalPage);
Toast.makeText(getApplicationContext(), "" + message, Toast.LENGTH_LONG).show();
if (status == true) {
JSONArray dataArray = mainObject.getJSONArray("data");
// Update Pagecount here
Pagecount = Pagecount + dataArray.length();
for (int i = 0; i < dataArray.length(); i++) {
JSONObject object = dataArray.getJSONObject(i);
JSONObject getProductObject = object.getJSONObject("GetProduct");
BeanGetProducts getProducts = new BeanGetProducts();
getProducts.setProduct_id(getProductObject.getString("product_id"));
getProducts.setImage(getProductObject.getString("image"));
getProducts.setSku(getProductObject.getString("sku"));
getProducts.setQuantity(getProductObject.getString("quantity"));
getProducts.setPrice(getProductObject.getString("price"));
getProducts.setStock_status_id(getProductObject.getString("stock_status_id"));
JSONObject product_description = object.getJSONObject("Product_Description");
getProducts.setName(product_description.getString("name"));
getProducts.setDescription(product_description.getString("description"));
JSONObject SpecialPrice = object.getJSONObject("SpecialPrice");
getProducts.setSpecialPrice(SpecialPrice.getString("price"));
beanGetProductses.add(getProducts);
productAdapter.notifyDataSetChanged();
}
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}
public void onBackPressed() {
Intent intent = new Intent(getApplicationContext(), AdminAccess.class);
intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TASK);
startActivity(intent);
finish();
}
}

endless scroll list view in android

I want to create Endless scroll view , list view data coming from server. i am created but when add new data then list view visible item started from start. And when add more than 70 rows then application crashed and error say array index out of bound.
I am new in android i am not able to use git hub library.
Please any one help me provide a simple example of endless list view or tutorial to use git hub library.
there my asyn class code
private class AlertSearchAsync extends AsyncTask<String, Void, String> {
#Override
protected String doInBackground(String... urls) {
String response = "";
for (String url : urls) {
DefaultHttpClient client = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
try {
HttpResponse execute = client.execute(httpGet);
InputStream content = execute.getEntity().getContent();
BufferedReader buffer = new BufferedReader(new InputStreamReader(content));
String s = "";
while ((s = buffer.readLine()) != null) {
response += s;
}
} catch (Exception e) {
e.printStackTrace();
}
}
return response;
}
#Override
protected void onPostExecute(String result) {
//pd.dismiss();
if(result.trim().contains("Result not found !"))
{
Toast.makeText(getApplicationContext(), result.trim(), Toast.LENGTH_LONG).show();
return;
}
else
{
mylist = new ArrayList<String>();
doc = XMLfunctions.XMLfromString(result);
// Toast.makeText(getApplicationContext(), ""+line, Toast.LENGTH_LONG).show();
NodeList nodes = doc.getElementsByTagName("JOB");
for (int i = 0; i < nodes.getLength(); i++) {
Element e = (Element) nodes.item(i);
pass_value.add(XMLfunctions.getValue(e, "id"));
if (!("null").equals(XMLfunctions.getValue(e, "location"))) {
mylist.add(XMLfunctions.getValue(e, "location"));
city_name.add(XMLfunctions.getValue(e, "location"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "title"))) {
mylist.add(XMLfunctions.getValue(e, "title"));
business_name.add(XMLfunctions.getValue(e, "title"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "state"))) {
mylist.add(XMLfunctions.getValue(e, "state"));
state_name.add(XMLfunctions.getValue(e, "state"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "company"))) {
mylist.add(XMLfunctions.getValue(e, "company"));
company_name.add(XMLfunctions.getValue(e, "company"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "url"))) {
mylist.add(XMLfunctions.getValue(e, "url"));
url_list.add(XMLfunctions.getValue(e, "url"));
} else {
mylist.add(" ");
}
if (!("null").equals(XMLfunctions.getValue(e, "description"))) {
mylist.add(XMLfunctions.getValue(e, "description"));
desc_list.add(XMLfunctions.getValue(e, "description"));
} else {
mylist.add(" ");
}
}
String[] company = new String[company_name.size()];
company = company_name.toArray(company);
String[] position = new String[business_name.size()];
position = business_name.toArray(position);
String[] state = new String[state_name.size()];
state = state_name.toArray(state);
String[] city = new String[city_name.size()];
city = city_name.toArray(city);
String[] url_str = new String[url_list.size()];
url_str = url_list.toArray(url_str);
String[] desc_str1 = new String[desc_list.size()];
desc_str1 = desc_list.toArray(desc_str1);
// datadap.setNotifyOnChange(false); // Prevents 'clear()' from clearing/resetting the listview
datadap.clear();
datadap= new Data(contect,company,position,city,state,pass_value,desc_str1);
// listView.setStackFromBottom(true);
// datadap.notifyDataSetChanged();
listView.setAdapter(datadap);
/* str_loc=str_locAlert;
str_desc=str_descAlert;
Toast.makeText(getApplicationContext(), "alert Class"+str_desc+str_loc, Toast.LENGTH_LONG).show();
Intent i= new Intent(Main_listview.this,Main_listview.class);
i.putExtra("line", result);
i.putExtra("limit", limit);
i.putExtra("Alert", true);
i.putExtra("str_Descrption",str_desc);
i.putExtra("str_location", str_loc);
startActivity(i); */
}
}
#Override
protected void onPreExecute()
{
//pd = ProgressDialog.show(Main_listview.this, "","Please wait...");
}
}
and i am load more data like this
listView.setOnScrollListener(new EndlessScrollListener() {
#Override
public void onLoadMore(int page, int totalItemsCount) {
// Triggered only when new data needs to be appended to the list
// Add whatever code is needed to append new items to your AdapterView
limit=limit+10;
// TODO Auto-generated method stub
AlertSearchAsync task1=new AlertSearchAsync();
String url="http://www.jobdiagnosis.com/fjobsrchservise.php?keyword="+
str_descAlert+
"&location="+str_locAlert+
"&start="+limit;
url=url.replace(" ", "%20");
//Toast.makeText(getApplicationContext(),"Limit"+limit, Toast.LENGTH_LONG).show();
task1.execute(url);
Log.d("URL ", url);
}
});
there my endlessscrollistner class
public abstract class EndlessScrollListener implements OnScrollListener {
// The minimum amount of items to have below your current scroll position
// before loading more.
private int visibleThreshold = 5;
// The current offset index of data you have loaded
private int currentPage = 0;
// The total number of items in the dataset after the last load
private int previousTotalItemCount = 0;
// True if we are still waiting for the last set of data to load.
private boolean loading = true;
// Sets the starting page index
private int startingPageIndex = 0;
public EndlessScrollListener() {
}
public EndlessScrollListener(int visibleThreshold) {
this.visibleThreshold = visibleThreshold;
}
public EndlessScrollListener(int visibleThreshold, int startPage) {
this.visibleThreshold = visibleThreshold;
this.startingPageIndex = startPage;
this.currentPage = startPage;
}
// This happens many times a second during a scroll, so be wary of the code you place here.
// We are given a few useful parameters to help us work out if we need to load some more data,
// but first we check if we are waiting for the previous load to finish.
#Override
public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
// If the total item count is zero and the previous isn't, assume the
// list is invalidated and should be reset back to initial state
// If there are no items in the list, assume that initial items are loading
if (!loading && (totalItemCount < previousTotalItemCount)) {
this.currentPage = this.startingPageIndex;
this.previousTotalItemCount = totalItemCount;
if (totalItemCount == 0) { this.loading = true; }
}
// If it’s still loading, we check to see if the dataset count has
// changed, if so we conclude it has finished loading and update the current page
// number and total item count.
if (loading) {
if (totalItemCount > previousTotalItemCount) {
loading = false;
previousTotalItemCount = totalItemCount;
currentPage++;
}
}
// If it isn’t currently loading, we check to see if we have breached
// the visibleThreshold and need to reload more data.
// If we do need to reload some more data, we execute onLoadMore to fetch the data.
if (!loading && (totalItemCount - visibleItemCount) <= (firstVisibleItem + visibleThreshold)) {
onLoadMore(currentPage + 1, totalItemCount);
loading = true;
}
}
// Defines the process for actually loading more data based on page
public abstract void onLoadMore(int page, int totalItemsCount);
#Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// Don't take any action on changed
}
}
I am relay sorry about my bad English
Please help me how we can create endless scroll list view

I think I might implement this the way that #commonsware does in this example: https://github.com/commonsguy/cwac-endless
Basically you create a ListView and attach an Adapter that automatically handles the endless scrolling and loading of Views.
See the class file here: https://github.com/commonsguy/cwac-endless/blob/master/src/com/commonsware/cwac/endless/EndlessAdapter.java