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swipe to refresh recyclerview duplicate item json

I have a problem, when i swipe to refresh the data, the first swipe is ok but after that every swipe reload and add the same data over and over again, by the end i have a list with same items over and over... I'm using a loader. I tried to clear before but i don't understand what's wrong with my code, if someone could explain it to me. Thank You.
Here my code :
public static final String EXTRA_URL = "imageUrl";
public static final String EXTRA_APKNAME = "apkname";
public static final String EXTRA_APKSIZE = "apksize";
public static final String EXTRA_APKFILE = "apkfile";
private RecyclerView mRecyclerView;
private MyAdapter mExampleAdapter;
private ArrayList<one_item> mExampleList;
private RequestQueue mRequestQueue;
private SwipeRefreshLayout swipeRefreshLayout;
#SuppressLint("RestrictedApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setTitle("APK VIP CHINA");
getSupportActionBar().setDefaultDisplayHomeAsUpEnabled(true);
swipeRefreshLayout = findViewById(R.id.refreshlayout);
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
parseJSON();
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
parseJSON();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void parseJSON() {
String url = "http://apkvip.net/json2.php";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("data");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject hit = jsonArray.getJSONObject(i);
String creatorName = hit.getString("ten");
String creatorsize = hit.getString("apk_size");
String creatorfile = hit.getString("link_apk");
String imageUrl = hit.getString("link_img");
mExampleList.add(new one_item(imageUrl, creatorName, creatorsize, creatorfile));
}
mExampleAdapter = new MyAdapter(MainActivity.this, mExampleList);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(MainActivity.this);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
public void onItemClick(int position) {
Intent detailIntent = new Intent(this, activity_detail.class);
one_item clickedItem = mExampleList.get(position);
detailIntent.putExtra(EXTRA_URL, clickedItem.getmImageUrl());
detailIntent.putExtra(EXTRA_APKNAME, clickedItem.getMapkname());
detailIntent.putExtra(EXTRA_APKSIZE, clickedItem.getMapksize());
detailIntent.putExtra(EXTRA_APKFILE, clickedItem.getMapkfile());
startActivity(detailIntent);
}}
My adapter:
private ArrayList<one_item> mExampleList;
private OnItemClickListener mListener;
public interface OnItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
mListener = listener;
}
public MyAdapter(Context context, ArrayList<one_item> exampleList) {
mContext = context;
mExampleList = exampleList;
}
#Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(mContext).inflate(R.layout.one_item, parent, false);
return new ExampleViewHolder(v);
}
#Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
one_item currentItem = mExampleList.get(position);
String imageUrl = currentItem.getmImageUrl();
String apkname = currentItem.getMapkname();
String apksize = currentItem.getMapksize();
String apkfile = currentItem.getMapkfile();
holder.mTextViewname.setText(apkname);
holder.mTextViewsize.setText(apksize);
holder.mTextViewfile.setText(apkfile);
Picasso.get().load(imageUrl).fit().centerInside().into(holder.mImageView);
}
#Override
public int getItemCount() {
return mExampleList.size();
}
#Override
public long getItemId(int position) {
return position;
}
public class ExampleViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextViewname, mTextViewsize, mTextViewfile;
public ExampleViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.image);
mTextViewname = itemView.findViewById(R.id.name);
mTextViewsize = itemView.findViewById(R.id.size);
mTextViewfile = itemView.findViewById(R.id.file);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mListener != null) {
int position = getAdapterPosition();
if (position != RecyclerView.NO_POSITION) {
mListener.onItemClick(position);
}
}
}
});}}}
my activitymain.xml:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:background="#FFFFFF"
android:orientation="vertical"
android:padding="5dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Recommended Apps"
android:textColor="#000"
android:textStyle="bold"
android:textSize="20sp"
android:layout_marginBottom="10dp"
/>
<androidx.swiperefreshlayout.widget.SwipeRefreshLayout
android:id="#+id/refreshlayout"
android:layout_width="wrap_content"
android:layout_height="match_parent"
>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
android:padding="5dp" />
</androidx.swiperefreshlayout.widget.SwipeRefreshLayout>

Just use mExampleList.clear() at the first line of your parseJSON() function
and then you'll be able to add the "updated" items.
In addition I'd suggest that you move swipeRefreshLayout.setRefreshing(false) to the end of Volley onResponse and onError() implementation -
Right now you're telling the swipeRefreshLayout to stop refreshing before the request(that happens asynchronously) has finished

You are initializing your adapter every time you do a swipe.
Change this constructor of MyAdapter code.
public MyAdapter(Context context, ArrayList<one_item> exampleList) {
mContext = context;
mExampleList = exampleList;
}
to,
public MyAdapter(Context context) {
mContext = context;
}
public setExampleList(ArrayList<one_item> exampleList){
mExampleList = exampleList;
}
Now change your onCreate function to.
#SuppressLint("RestrictedApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setTitle("APK VIP CHINA");
getSupportActionBar().setDefaultDisplayHomeAsUpEnabled(true);
swipeRefreshLayout = findViewById(R.id.refreshlayout);
mRecyclerView = findViewById(R.id.recycler_view);
mRecyclerView.setHasFixedSize(true);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mExampleList = new ArrayList<>();
mRequestQueue = Volley.newRequestQueue(this);
//Changed Code
mExampleAdapter = new MyAdapter(MainActivity.this);
mRecyclerView.setAdapter(mExampleAdapter);
mExampleAdapter.setOnItemClickListener(MainActivity.this);
parseJSON();
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
parseJSON();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void parseJSON() {
String url = "http://apkvip.net/json2.php";
JsonObjectRequest request = new JsonObjectRequest(Request.Method.GET, url, null,
new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("data");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject hit = jsonArray.getJSONObject(i);
String creatorName = hit.getString("ten");
String creatorsize = hit.getString("apk_size");
String creatorfile = hit.getString("link_apk");
String imageUrl = hit.getString("link_img");
mExampleList.add(new one_item(imageUrl, creatorName, creatorsize, creatorfile));
}
//Changed Code
mExampleAdapter.setExampleList(mExampleList);
mExampleAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
mRequestQueue.add(request);
}
I have added a comment of the code block where I have made the changes.
Feel free to comment in case you have any queries.

ArrayList not being displayed in RecyclerView

I'm trying to display an ArrayList of Integers inside of a RecyclerView, the Integer values in the ArrayList are downloaded from JSON, all that is done, the thing I need help with is to display them in a RecyclerView.
This is my code so far but the RecyclerView does not display anything.
All code updated to my current code
Here's part of the MainActivity:
public class MainActivity extends AppCompatActivity {
private ActivityMainViewModel viewmodel;
RecyclerView recyclerView;
MainAdapter mAdapter;
public static ArrayList<Integer> rideList = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
viewmodel = new ActivityMainViewModel();
binding.setViewmodel(viewmodel);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MainAdapter(rideList);
recyclerView.setAdapter(mAdapter);
}
Here's the MainAdapter class:
class MainAdapter extends android.support.v7.widget.RecyclerView.Adapter<MainAdapter.ViewHolder> {
private ArrayList<Integer> rideList;
public MainAdapter(ArrayList<Integer> rideList)
{
this.rideList = rideList;
}
#Override
public MainAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(MainAdapter.ViewHolder holder, int position)
{
holder.rideHeight.setText(String.valueOf(rideList.get(position)));
}
#Override
public int getItemCount()
{
return rideList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView rideHeight;
public ViewHolder(View itemView) {
super(itemView);
rideHeight = (TextView) itemView.findViewById(R.id.rideHeight_textView);
}
}
}
row.xml:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/rideHeight_textView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:textSize="20sp"/>
</LinearLayout>
I know that it probably looks a mess but that's because I have been searching both on google and youtube on how to use RecyclerView so I might have mixed from different tutorials and tried somethings myself.
Thanks!
Edit: JsonData code added on request:
JsonData:
public class JsonData
{
public ObservableField<String> dropHeight = new ObservableField<>();
public ObservableField<String> rideCount = new ObservableField<>();
int eID;
int sID;
public JsonData()
{
dropHeight.set("");
rideCount.set("");
}
public void downloadFromSkistar()
{
if (SettingsActivity.submitClicked)
{
eID = SettingsActivity.x;
sID = SettingsActivity.y;
}
else
{
eID = 3206;
sID = 11;
}
try
{
URL url = new URL("https://www.skistar.com/myskistar/api/v2/views/statisticspage.json?entityId=" + eID + "&seasonId=" + sID + " ");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.i("AndroidExample", "Response: " + response);
if (response == 200)
{
String json = getJson(conn.getInputStream());
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("rideStatistics");
int reponame = 0;
int rHeight = 0;
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject skiRun = jsonArray.getJSONObject(i);
reponame += skiRun.getInt("height");
rHeight += skiRun.getInt("height");
MainActivity.rideList.add(new Integer(rHeight));
rHeight = 0;
}
final int height = reponame;
final int count = jsonArray.length();
new Handler(Looper.getMainLooper()).post(new Runnable() {
#Override
public void run() {
dropHeight.set("" + height);
rideCount.set("" + count);
}
});
}
}
catch (Exception e)
{
Log.i("AndroidExample", "Error");
}
finally
{
}
}
private String getJson(InputStream stream) throws IOException
{
BufferedReader reader;
reader = new BufferedReader(new InputStreamReader(stream, "UTF-8"));
StringBuilder builder = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
builder.append(line + '\n');
}
//Should be placed in finally
stream.close();
return builder.toString();
}
}

You can use like..
Model..to set value and get value
public class CustomModel {
private int it;
public int getIt() {
return it;
}
public void setIt(int it) {
this.it = it;
}
}
Adapter ...
private class MainAdapter extends RecyclerView.Adapter<MainAdapter.ViewHolder>{
public MainAdapter(ArrayList<CustomModel> list){
dataSet = list;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View itemLayoutView = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.row, null);
itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));
MainAdapter.ViewHolder viewHolder = new MainAdapter.ViewHolder(itemLayoutView);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int position) {
CustomModel cardModel = dataSet.get(position);
viewHolder.rideHeight_textView.setText(String.valueOf(cardModel.getId()));
}
#Override
public int getItemCount() {
return dataSet.size();
}
public void updateList(List<CustomModel> temp) {
dataSet = (ArrayList<CustomModel>) temp;
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView rideHeight_textView;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
rideHeight_textView = (TextView) itemLayoutView .findViewById(R.id.rideHeight_textView);
itemLayoutView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
//action ****
}
});
}
}
}
Just call like
ArrayList<CustomModel> menuList = new ArrayList<>();
CustomModel c = new CustomModel();
c.setIt(1);
recyclerView.setHasFixedSize(true);
// ListView
recyclerView.setLayoutManager(new LinearLayoutManager(Your activity.this));
// create an Object for Adapter
MainAdapter mAdapter = new MainAdapter(menuList);
// set the adapter object to the Recyclerview
recyclerView.setAdapter(mAdapter);
row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#ffffff"
android:padding="#dimen/activity_vertical_margin"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/rideHeight_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="20sp"/>
</LinearLayout>

recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
LinearLayoutManager layoutManager = new LinearLayoutManager(context);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
mAdapter = new MainAdapter(JsonData.rideList, MainActivity.this);
recyclerView.setAdapter(mAdapter);
mAdapter.notifyDataSetChanged();
adapter:
class MainAdapter extends android.support.v7.widget.RecyclerView.Adapter<MainAdapter.ViewHolder> {
private ArrayList<Integer> rideList = new ArrayList<>();
private Context context;
public MainAdapter(ArrayList<Integer> rideList, Context context)
{
this.context = context;
this.rideList = rideList;
}
#Override
public MainAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
View view = LayoutInflater.from(context).inflate(R.layout.row, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(MainAdapter.ViewHolder holder, int position)
{
holder.rideHeight.setText(String.valueOf(rideList.get(position)));
}
#Override
public int getItemCount()
{
return rideList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView rideHeight;
public ViewHolder(View itemView) {
super(itemView);
rideHeight = (TextView) itemView.findViewById(R.id.rideHeight_textView);
}
}
}
row.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:background="#ffffff"
android:padding="#dimen/activity_vertical_margin"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/rideHeight_textView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
android:textSize="20sp"/>
</LinearLayout>

For starters you are not calling your data fetcher method in JsonData class. Your code is kind of messy so you can try the following solution:
In your adapter class add this method:
public void setList(ArrayList<Integer> rideList)
{
this.rideList = rideList;
notifyDataSetChanged();
}
Then in you JsonData class add:
private MainAdapter adapter;
public JsonData(MainAdapter adapter)
{
this.adapter = adapter;
dropHeight.set("");
rideCount.set("");
}
And change downloadFromSkistar to:
public void downloadFromSkistar()
{
if (SettingsActivity.submitClicked)
{
eID = SettingsActivity.x;
sID = SettingsActivity.y;
}
else
{
eID = 3206;
sID = 11;
}
new AsyncTask<Void, Void, List<Integer>>() {
#Override
protected List<Integer> doInBackground(Void... voids) {
try
{
URL url = new
URL("https://www.skistar.com/myskistar/api/v2/views/statisticspage.json?
entityId=" + eID + "&seasonId=" + sID + " ");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
conn.setReadTimeout(10000 /* milliseconds */);
conn.setConnectTimeout(15000 /* milliseconds */);
conn.setRequestMethod("GET");
// Starts the query
conn.connect();
int response = conn.getResponseCode();
Log.i("AndroidExample", "Response: " + response);
if (response == 200)
{
String json = getJson(conn.getInputStream());
JSONObject jsonObject = new JSONObject(json);
JSONArray jsonArray = jsonObject.getJSONArray("rideStatistics");
int reponame = 0;
int rHeight = 0;
for (int i = 0; i < jsonArray.length(); i++)
{
JSONObject skiRun = jsonArray.getJSONObject(i);
reponame += skiRun.getInt("height");
rHeight += skiRun.getInt("height");
rideList.add(new Integer(rHeight));
rHeight = 0;
}
}
}
catch (Exception e)
{
Log.i("AndroidExample", "Error");
}
finally
{
}
return rideList;
}
#Override
protected void onPostExecute(List<Integer> list)
{
super.onPostExecute(list);
adapter.setList(rideList);
}
};
}
And in the end finally change MainActivity to:
public class MainActivity extends AppCompatActivity {
private ActivityMainViewModel viewmodel;
RecyclerView recyclerView;
MainAdapter mAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
viewmodel = new ActivityMainViewModel();
binding.setViewmodel(viewmodel);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MainAdapter(JsonData.rideList);
recyclerView.setAdapter(mAdapter);
new JsonData(mAdapter).downloadFromSkistar();
}
PS: You are going to get NetworkOnMainThread exception. So try to add the network code in AsyncTask

Here's what I did to solve it, and btw I'm also using the SwipeRefreshLayout.
public class MainActivity extends AppCompatActivity {
private ActivityMainViewModel viewmodel;
RecyclerView recyclerView;
MainAdapter mAdapter;
public static ArrayList<Integer> rideList = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//setContentView(R.layout.activity_main);
ActivityMainBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
viewmodel = new ActivityMainViewModel();
binding.setViewmodel(viewmodel);
recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
mAdapter = new MainAdapter(rideList);
recyclerView.setAdapter(mAdapter);
viewmodel.jdDownloadFromSkistar();
final SwipeRefreshLayout swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipelayout);;
swipeRefreshLayout.setColorSchemeResources(R.color.refresh,R.color.refresh1,R.color.refresh2);
swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
swipeRefreshLayout.setRefreshing(true);
refreshRecyclerView();
swipeRefreshLayout.setRefreshing(false);
}
});
}
private void refreshRecyclerView()
{
mAdapter.notifyDataSetChanged();
}
So what I did was make a call to the jdDownloadFromSkistar(); Method and when I swipe to refresh it updates the adapter by using the notifyDataSetChanged(); method.

Values not showing in android recyclerview

I have a recyclerview in my project and data not bind to the recyclerview. I am getting data from the server and data correctly come. I put a Toast in the Adapter Class and it is working. I cannot figure out the problem.
Activity Class....
public class ViewDealerCompln extends AppCompatActivity {
#Override
protected void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_dealer_complain);
typeface = Typeface.createFromAsset(getAssets(), "productsans.ttf");
recyclerView = (RecyclerView) findViewById(R.id.com_recyclerView);
compList = new ArrayList<>();
toolbar = (Toolbar) findViewById(R.id.com_view_app_bar);
TextView mTitle = (TextView) toolbar.findViewById(R.id.toolbar_title);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle("");
mTitle.setText("Complain History");
mTitle.setTypeface(typeface);
repID = DealerListAdapter.getRepID();
dealerID = DealerListAdapter.getDealerID();
mLayoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setAdapter(adcAdapter);
getData();
}
private void getData() {
String tag_string_req = "req_data";
request = new StringRequest(Request.Method.POST, AppConfig.URL_JSON_GETCOMPLAIN, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
if (jsonObject.names().get(0).equals("feed")) {
JSONArray jsonFeedArray = jsonObject.getJSONArray("feed");
if (jsonFeedArray.length() > 0) {
for (int i = 0; i < jsonFeedArray.length(); i++) {
JSONObject currentObject = jsonFeedArray.getJSONObject(i);
String namemm = currentObject.getString("compId");
compList.add(namemm);
}
adcAdapter = new ViewDealerComplainAdapter(ViewDealerCompln.this, compList);
} else {
Toast.makeText(getApplicationContext(), "No data Available!", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(getApplicationContext(), "Invalid Response from the server!", Toast.LENGTH_SHORT).show();
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
}) {
};
}
}
Adapter class...
public class ViewDealerComplainAdapter extends RecyclerView.Adapter<ViewDealerComplainAdapter.ItemViewHolder> {
private LayoutInflater inflater;
private ArrayList<String> subList;
private Context context;
public ViewDealerComplainAdapter(Context context, ArrayList<String> a) {
this.context = context;
inflater = LayoutInflater.from(context);
this.subList = a;
Toast.makeText(context, subList.toString(), Toast.LENGTH_SHORT).show();
}
#Override
public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.custom_complain_list_row, parent, false);
ViewDealerComplainAdapter.ItemViewHolder holder = new ViewDealerComplainAdapter.ItemViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(ItemViewHolder holder, int position) {
holder.title.setText(subList.get(position));
}
#Override
public int getItemCount() {
return subList.size();
}
public class ItemViewHolder extends RecyclerView.ViewHolder {
private TextView title;
public ItemViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.compHID);
}
}
}
custom row layout...
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="48dp">
<TextView
android:id="#+id/compHID"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#color/white"
android:padding="10dp" />
</LinearLayout>
main layout...
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include
android:id="#+id/com_view_app_bar"
layout="#layout/app_toolbar_send_complain"></include>
<android.support.v7.widget.RecyclerView
android:id="#+id/com_recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp">
</android.support.v7.widget.RecyclerView>
</LinearLayout>

In your activity, before this line recyclerView.setAdapter(adcAdapter);
write
adcAdapter=new ViewDealerComplainAdapter(this,new ArrayList<String>())
In the adapter create a function as follow
public void setData(ArrayList<String> data){
this.sublist=data;
}
Now, in the function getData()
after this
for (int i = 0; i < jsonFeedArray.length(); i++) {
JSONObject currentObject = jsonFeedArray.getJSONObject(i);
String namemm = currentObject.getString("compId");
compList.add(namemm);
}
write
adcAdapter.setData(compList);
adcAdapter.notifyDataSetChanged();
This will make give you the result right as rain

I think it is happening because you have set the adapter before creating object.
recyclerView.setAdapter(adcAdapter);
getData();
You have first set the adapter to recyclerView and then you call getData() method in which you create object of adcAdapter.

after the loading data from the server update RecyclerView
adcAdapter = new ViewDealerComplainAdapter(ViewDealerCompln.this, compList);
adcAdapter.notifyDataSetChanged();
another way
create a method in Adapter
public void setDataChange(List<Object> asList) {
this.List = asList;
//now, tell the adapter about the update
notifyDataSetChanged();
}
and
adcAdapter.setDataChange(list);

your adapter has two parameters context & arrayList, so while creating instance of adapter make sure you are passing both the values to adapter and set the same adapter to your RecyclerView.
mAdapter=new MAdapter(this,list);
mRecyclerView.setAdapter(mAdapter);
once you have data in your list then pass that list to adapter.

You are setting adcAdapter in to recyclerView before initialize it.
Change code as blow.
adcAdapter = new ViewDealerComplainAdapter(ViewDealerCompln.this, compList);
recyclerView.setAdapter(adcAdapter);
Also you need to call notifyDataSetChanged() on adapter to update recycleview when you get response.
adcAdapter.notifyDataSetChanged();

how to change recyclerview content depend on selected item in a category spinner

I have a recyclerview that feed from DB and I have a spinner that show category.
I need to change and refresh recyclerview contents when spinner selected item has changed.thanks for your helps.
cardAdapter.java
public class CardAdapter extends RecyclerView.Adapter<CardAdapter.ViewHolder> {
private ImageLoader imageLoader;
private Context context;
List<Info_Details> superHeroes;
public CardAdapter(List<Info_Details> superHeroes, Context context){
super();
this.superHeroes = superHeroes;
this.context = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row_list, parent, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder holder, final int position) {
final Info_Details superHero = superHeroes.get(position);
imageLoader = CustomVolleyRequest.getInstance(context).getImageLoader();
imageLoader.get(superHero.getImageUrl(), ImageLoader.getImageListener(holder.imageView, R.mipmap.ic_launcher, android.R.drawable.ic_dialog_alert));
holder.imageView.setImageUrl(superHero.getImageUrl(), imageLoader);
holder.textViewCost.setText(superHero.getCost());
holder.textViewCat.setText(superHero.getCat());
holder.imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent=new Intent(context, DetailsActivity.class);
intent.putExtra("image",superHeroes.get(position).getImageUrl().toString());
intent.putExtra("cost",superHeroes.get(position).getCost().toString());
intent.putExtra("cat",superHeroes.get(position).getCat().toString());
intent.putExtra("desc",superHeroes.get(position).getDesc());
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return superHeroes.size();
}
class ViewHolder extends RecyclerView.ViewHolder{
public NetworkImageView imageView;
public TextView textViewCost;
public TextView textViewCat;
public ViewHolder(View itemView) {
super(itemView);
imageView = (NetworkImageView) itemView.findViewById(R.id.imageViewHero);
textViewCost = (TextView) itemView.findViewById(R.id.textViewName);
textViewCat= (TextView) itemView.findViewById(R.id.textViewCreatedBy);
}
}
}
MainActivity.java
public class MainActivity_Second extends AppCompatActivity implements
AdapterView.OnItemSelectedListener {
private Spinner catSpin2;
private String[] category2;
TextView nameShow, emailShow;
String get_url = "http://bode3.ir/app/get_info.php";
private List<Info_Details> listSuperHeroes;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private RecyclerView.Adapter adapter;
private String selectedCategory;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main__second);
catSpin2 = (Spinner) findViewById(R.id.spinner435);
category2 = getResources().getStringArray(R.array.catSelect);
ArrayAdapter<String> adapter2 = new ArrayAdapter<String>(MainActivity_Second.this,
android.R.layout.simple_dropdown_item_1line, category2);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
catSpin2.setAdapter(adapter2);
recyclerView = (RecyclerView) findViewById(R.id.card_recycler_view);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
listSuperHeroes = new ArrayList<>();
catSpin2.setOnItemSelectedListener(this);
getData();
}
private void getData() {
final ProgressDialog loading = ProgressDialog.show(this, "Loading Data", "Please wait...", false, false);
JsonArrayRequest jsonArrayRequest = new JsonArrayRequest(Request.Method.POST, get_url, null,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
loading.dismiss();
parseData(response);
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonArrayRequest);
}
private void parseData(JSONArray array) {
for (int i = 0; i < array.length(); i++) {
Info_Details superHero = new Info_Details();
JSONObject json = null;
try {
json = array.getJSONObject(i);
superHero.setImageUrl(json.getString("Name"));
superHero.setCost(json.getString("Cost"));
superHero.setCat(json.getString("Cat"));
} catch (JSONException e) {
e.printStackTrace();
}
listSuperHeroes.add(superHero);
}
adapter = new CardAdapter(listSuperHeroes, this);
recyclerView.setAdapter(adapter);
}
#Override
public void onBackPressed() {
finish();
}
#Override
public void onItemSelected(AdapterView<?> adapterView, View view, int position, long l) {
switch (position) {
case 0:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
case 1:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
case 2:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
case 3:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
case 4:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
case 5:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
case 6:
selectedCategory = category2[position];
Toast.makeText(MainActivity_Second.this, "selectedCat: " + selectedCategory, Toast.LENGTH_SHORT).show();
break;
}
}
#Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
}
activity_main.xml
<?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:background="#color/colorAccent"
tools:context=".MainActivity_Second">
<TextView
android:id="#+id/textView435"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="انتخاب دسته بندی :"
android:textColor="#fff"
android:textSize="24sp"
android:textStyle="bold" />
<Spinner
android:id="#+id/spinner435"
android:layout_width="match_parent"
android:layout_height="30dp"
android:layout_below="#+id/textView435"
android:background="#android:color/background_light" />
<android.support.v7.widget.RecyclerView
android:id="#+id/card_recycler_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="10dp"
android:scrollbars="vertical"
android:layout_below="#+id/spinner435"/>
</RelativeLayout>

You can clear superHeroes every time an item is selected in the spinner and populate it with the data you want to display and call adapter.notifyDataSetChanged.

set a filter methood in CardAdapter.java
public void setFilter(List<Info_Details> newList) {
superHeroes = new ArrayList<>();
superHeroes.addAll(newList);
notifyDataSetChanged();
}
and then in MainActivity. make new list for every change in spinner selected item and send new list to CardAdapter By call filter method.
private void setChange(String selectedCategory) {
List<Info_Details> newList = new ArrayList<>();
if (selectedCategory != "all") {
for (Info_Details info : this.listSuperHeroes) {
String cat = info.getCat();
if (cat.contains(selectedCategory)) {
newList.add(info);
}
}
adapter.setFilter(newList);
} else {
for (Info_Details info : this.listSuperHeroes) {
newList.add(info);
}
adapter.setFilter(newList);
}
}

Infinitive RecyclerView doesn't work for me

I know that this question was asked many times before, but i'm confused why sometimes the data is loaded and sometimes data isn't loaded once i get to the end of list. Also when i go fast scrolling through the list, and the new data has been loaded, but immediately it returns me to the first item in list and remove all new loaded items from the next page from server. So that is the second problem and the third problem is that when i load items using SwipeRefreshLayout, i'm also not getting new items when i reach the end of the list.
I have implemented this in my project: https://gist.github.com/ssinss/e06f12ef66c51252563e
list.setLayoutManager(manager);
list.setEmptyView(emptyView);
list.setItemAnimator(new DefaultItemAnimator());
list.setAdapter(mAdapter);
loadJokes(1);
list.addOnScrollListener(new EndlessRecyclerOnScrollListener(manager) {
#Override
public void onLoadMore(final int current_page) {
loadMoreJokes(current_page);
}
});
Here is the method where i'm loading more items from server:
private void loadMoreJokes(int current_page) {
StringRequest request = new StringRequest(Request.Method.GET, AppConfig.URL_GET_ALL_JOKES + current_page,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
hideDialog();
try {
JSONObject object = new JSONObject(response);
boolean error = object.getBoolean("error");
JSONArray jokes = object.getJSONArray("jokes");
if (!error) {
for (int i = 0; i < jokes.length(); i++) {
JSONObject object1 = jokes.getJSONObject(i);
Joke joke = new Joke();
joke.setId(object1.optInt("id"));
joke.setLikes(object1.optInt("likes"));
joke.setComments(object1.optInt("comments"));
joke.setJoke(object1.optString("joke"));
joke.setCreatedAt(object1.optString("created_at"));
joke.setName(object1.optString("user_name"));
joke.setImagePath(object1.optString("image_path"));
joke.setFacebookUserId(object1.optString("facebook_user_id"));
joke.setCategory(object1.optString("category"));
mJokes.add(joke);
}
menu.showMenu(true);
}
// Notify adapter that data has changed
mAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
hideDialog();
Toast.makeText(getActivity(), error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
AppController.getInstance().addToRequestQueue(request);
}
And here is the method where i'm loading first visible items when someone launch the app:
private void loadJokes(int page) {
pDialog.setMessage("Loading..");
showDialog();
StringRequest request = new StringRequest(Request.Method.GET, AppConfig.URL_GET_ALL_JOKES + page,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
mJokes.clear();
hideDialog();
try {
JSONObject object = new JSONObject(response);
boolean error = object.getBoolean("error");
JSONArray jokes = object.getJSONArray("jokes");
if (!error) {
for (int i = 0; i < jokes.length(); i++) {
JSONObject object1 = jokes.getJSONObject(i);
Joke joke = new Joke();
joke.setId(object1.optInt("id"));
joke.setLikes(object1.optInt("likes"));
joke.setComments(object1.optInt("comments"));
joke.setJoke(object1.optString("joke"));
joke.setCreatedAt(object1.optString("created_at"));
joke.setName(object1.optString("user_name"));
joke.setImagePath(object1.optString("image_path"));
joke.setFacebookUserId(object1.optString("facebook_user_id"));
joke.setCategory(object1.optString("category"));
mJokes.add(joke);
}
menu.showMenu(true);
}
// Notify adapter that data has changed
mAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
hideDialog();
menu.showMenu(true);
Toast.makeText(getActivity(), error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
AppController.getInstance().addToRequestQueue(request);
}
And this is onRefresh() method:
#Override
public void onRefresh() {
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
refreshItems();
}
}, 5000);
}
private void refreshItems() {
loadJokes(1);
mSwipeRefreshLayout.setRefreshing(false);
}
If i need to post more code, let me know. I really need to solve this problem as soon as i can. So again, the problems are the following:
When fast scrolling through the list, new items are being loaded, but immediately after that it returns me to the beginning of the list and when i go to the end of list again, load more doesn't respond.
After refreshing the list with SwipRefreshLayout, also scrolling doesn't respond at the end.
Note: The scrolling and loading new items is working only if i go slowly through the list and if i didn't swipe to refresh list.
EDIT:
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_jokes, container, false);
mContext = getActivity();
mView = (CoordinatorLayout) view.findViewById(R.id.coordinatorLayout);
TextView tvEmptyText = (TextView) view.findViewById(R.id.tv_empty);
ImageView ivSignal = (ImageView) view.findViewById(R.id.iv_signal);
if (!ConnectionDetector.getInstance(getActivity()).isOnline() && mAdapter == null) {
tvEmptyText.setVisibility(View.VISIBLE);
ivSignal.setVisibility(View.VISIBLE);
showNoInternetSnackbar();
}
// INITIALIZE RECYCLER VIEW
EmptyRecyclerView list = (EmptyRecyclerView) view.findViewById(R.id.list);
mJokes = new ArrayList<>();
mAdapter = new RecyclerJokesAdapter(getActivity(), mJokes, JokesFragment.this, null);
// Progress dialog
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("Please wait");
pDialog.setIndeterminate(true);
pDialog.setCancelable(false);
showDialog();
View emptyView = inflater.inflate(R.layout.layout_empty_view, container, false);
FloatingActionButton fab1 = (FloatingActionButton) view.findViewById(R.id.fab_funny);
FloatingActionButton fab2 = (FloatingActionButton) view.findViewById(R.id.fab_good_morning);
FloatingActionButton fab3 = (FloatingActionButton) view.findViewById(R.id.fab_good_night);
FloatingActionButton fab4 = (FloatingActionButton) view.findViewById(R.id.fab_all);
menu = (FloatingActionMenu) view.findViewById(R.id.menu_sort_jokes);
fab1.setOnClickListener(this);
fab2.setOnClickListener(this);
fab3.setOnClickListener(this);
fab4.setOnClickListener(this);
mSwipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_container);
mSwipeRefreshLayout.setOnRefreshListener(this);
mSwipeRefreshLayout.setColorSchemeResources(
R.color.refresh_progress_1,
R.color.refresh_progress_2,
R.color.refresh_progress_3);
LinearLayoutManager manager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
list.setLayoutManager(manager);
list.setEmptyView(emptyView);
list.setItemAnimator(new DefaultItemAnimator());
list.setAdapter(mAdapter);
if (ConnectionDetector.getInstance(mContext).isOnline()) {
loadJokes(1);
} else {
showNoInternetSnackbar();
hideDialog();
}
list.addOnScrollListener(new EndlessRecyclerOnScrollListener(manager) {
#Override
public void onLoadMore(final int current_page) {
loadMoreJokes(current_page);
}
});
return view;
}

In onCreate method initialize your adapter, recyclerView and List
List<MyObject> myList = new ArrayList<>();
recyclerViewAdapter = new RecyclerViewAdapter(context, myList)
myRecyclerView.setAdapter(recyclerViewAdapter);
Now, whenever you load data. add the data to your myList and call notifyDataSetChange on your adpater
myList.add(data);
recyclerViewAdapter.notifyDataSetChange();

Use this wrapper class
import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import java.util.List;
public abstract class RecyclerWrapperAdapter<E> extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
protected Context context;
protected List<E> objects;
public void setContext(Context context) {
this.context = context;
}
public void setObjects(List<E> objects) {
this.objects = objects;
notifyDataSetChanged();
}
public void add(#NonNull E object) {
objects.add(object);
notifyDataSetChanged();
}
public void add(int position, #NonNull E object) {
if (position < objects.size() && position >= 0) {
objects.add(position, object);
notifyItemChanged(position);
notifyDataSetChanged();
} else if (position >= objects.size()) {
objects.add(object);
notifyDataSetChanged();
}
}
public void set(int position, #NonNull E object) {
if (position < objects.size() && position >= 0) {
objects.set(position, object);
notifyItemChanged(position);
} else if (position >= objects.size()) {
objects.add(object);
notifyDataSetChanged();
}
}
public void remove(#NonNull E object) {
objects.remove(object);
notifyDataSetChanged();
}
public void remove(int position) {
if (position >=0 && position < objects.size()) {
objects.remove(position);
notifyDataSetChanged();
}
}
public void removeAll() {
objects.clear();
notifyDataSetChanged();
}
public E getItem(int position) {
return objects.get(position);
}
#Override
public int getItemCount() {
return objects.size();
}
}

Well I have done this way:
MainActivity .java
public class MainActivity extends AppCompatActivity implements SwipeRefreshLayout.OnRefreshListener, onRecyclerViewListener {
private RecyclerView mRecyclerView;
private TextView tvEmptyView;
private LinearLayoutManager mLayoutManager;
private List<Object> studentList;
protected Handler handler;
private int count = 0;
private SwipeRefreshLayout swipeRefreshLayout;
private MyRecycleAdapter myRecycleAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
swipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swiperefresh);
swipeRefreshLayout.setOnRefreshListener(this);
swipeRefreshLayout.setColorSchemeResources(R.color.blue, R.color.purple, R.color.green, R.color.orange);
tvEmptyView = (TextView) findViewById(R.id.empty_view);
mRecyclerView = (RecyclerView)findViewById(R.id.recyclerView);
studentList = new ArrayList<Object>();
handler = new Handler();
loadData();
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mLayoutManager.setOrientation(LinearLayoutManager.VERTICAL);
// use a linear layout manager
mRecyclerView.setLayoutManager(mLayoutManager);
myRecycleAdapter = new MyRecycleAdapter(mRecyclerView, studentList, R.layout.list_row, R.layout.progressbar_item, this);
myRecycleAdapter.setLoadMoreEnable(true);
myRecycleAdapter.setOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
count++;
if (count == 4) {
count = 0;
myRecycleAdapter.setLoadMoreEnable(false);
} else {
myRecycleAdapter.setLoadMoreEnable(true);
}
//add null , so the adapter will check view_type and show progress bar at bottom
studentList.add(null);
myRecycleAdapter.notifyItemInserted(studentList.size() - 1);
handler.postDelayed(new Runnable() {
#Override
public void run() {
// remove progress item
studentList.remove(studentList.size() - 1);
myRecycleAdapter.notifyItemRemoved(studentList.size());
//add items one by one
int start = studentList.size();
int end = start + 20;
for (int i = start + 1; i <= end; i++) {
studentList.add(new Student("Student " + i, "AndroidStudent" + i + "#gmail.com"));
myRecycleAdapter.notifyItemInserted(studentList.size());
}
myRecycleAdapter.setLoaded();
//or you can add all at once but do not forget to call mAdapter.notifyDataSetChanged();
}
}, 1000);
}
});
ItemViewHolderNew.setRecyclerListener(this);
mRecyclerView.setAdapter(myRecycleAdapter);
if (studentList.isEmpty()) {
mRecyclerView.setVisibility(View.GONE);
tvEmptyView.setVisibility(View.VISIBLE);
} else {
mRecyclerView.setVisibility(View.VISIBLE);
tvEmptyView.setVisibility(View.GONE);
}
}
private void loadData() {
for (int i = 1; i <= 20; i++) {
studentList.add(new Student("Student " + i, "androidstudent" + i + "#gmail.com"));
}
}
#Override
public void onRefresh() {
swipeRefreshLayout.setRefreshing(true);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
swipeRefreshLayout.setRefreshing(false);
}
},5000);
}
#Override
public void onBindView(View view, final ItemViewHolderNew itemViewHolder) {
itemViewHolder.tvName = (TextView) view.findViewById(R.id.tvName);
itemViewHolder.tvEmailId = (TextView) view.findViewById(R.id.tvEmailId);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position, Object object, ItemViewHolderNew itemViewHolder) {
Student studentObj = (Student)object;
itemViewHolder.tvName.setText(studentObj.getName());
itemViewHolder.tvEmailId.setText(studentObj.getEmailId());
itemViewHolder.student= studentObj;
}
#Override
public void setClickListener(View view, ItemViewHolderNew itemViewHolder) {
Toast.makeText(view.getContext(), "OnClick :" + itemViewHolder.student.getName() + " \n " + itemViewHolder.student.getEmailId(), Toast.LENGTH_SHORT).show();
}
public static class ItemViewHolderNew extends RecyclerView.ViewHolder{
public TextView tvName, tvEmailId;
public Student student;
private static onRecyclerViewListener mListener;
public static void setRecyclerListener(onRecyclerViewListener listener){
mListener = listener;
}
public ItemViewHolderNew(View itemView) {
super(itemView);
mListener.onBindView(itemView, this);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
setClick(v);
}
});
}
private void setClick(View v) {
mListener.setClickListener(v, this);
}
}
}
Add OnLoadMoreListener.java interface
public interface OnLoadMoreListener {
void onLoadMore();
}
Add Student.java as Model class
public class Student implements Serializable {
private static final long serialVersionUID = 1L;
private String name;
private String emailId;
public Student(String name, String emailId) {
this.name = name;
this.emailId = emailId;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEmailId() {
return emailId;
}
public void setEmailId(String emailId) {
this.emailId = emailId;
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
app:layout_behavior="#string/appbar_scrolling_view_behavior"
tools:context=".MainActivity"
tools:showIn="#layout/activity_main">
<android.support.v4.widget.SwipeRefreshLayout
android:id="#+id/swiperefresh"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical">
</android.support.v7.widget.RecyclerView>
</android.support.v4.widget.SwipeRefreshLayout>
<TextView
android:id="#+id/empty_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:text="No Records Here !"
android:visibility="gone" />
</RelativeLayout>
list_row.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<LinearLayout
android:layout_width="match_parent"
android:orientation="vertical"
android:layout_height="match_parent"
android:padding="5dp"
android:background="?android:selectableItemBackground">
<TextView
android:id="#+id/tvName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:text="Name"
android:textColor="#android:color/black"
android:textSize="18sp" />
<TextView
android:id="#+id/tvEmailId"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tvName"
android:layout_margin="5dp"
android:text="Email Id"
android:textColor="#android:color/black"
android:textSize="12sp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:text="Name"
android:textColor="#android:color/black"
android:textSize="18sp" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/tvName"
android:layout_margin="5dp"
android:text="Email Id"
android:textColor="#android:color/black"
android:textSize="12sp" />
</LinearLayout>
</android.support.v7.widget.CardView>
progressbar_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:gravity="center"
android:layout_width="match_parent" android:layout_height="match_parent">
<ProgressBar
android:id="#+id/progressBar1"
android:layout_width="wrap_content"
android:layout_gravity="center_horizontal"
android:layout_height="wrap_content" />
</LinearLayout>
Working fine with Endless, swipe to refresh, load more RecyclerView.
Hope this would help you.

Volley RequestQueue uses a thread pool for network requests.
/** Number of network request dispatcher threads to start. */
private static final int DEFAULT_NETWORK_THREAD_POOL_SIZE = 4;
Obviously, when you do fast scrolling through the list multiple requests are generated in quick succession.
There is a possibility that the responses are received asynchronously / out of sequence. Also, its possible that the "No more data" responses / error responses etc arrive before the responses with next page of data, which may lead to unexpected behaviour by your app.
Specially watch out for how this would effect your mJokes ArrayList member variable.