Develop Reference

Calculating Price * Quantity from Adapter to Total Price from Activity

I want to get total price in Activity from Price and Quantity in Adapter, it's mean like qty * price = total_price.
Here is my Adapter for handling the list of Items Activity:
package com.example.aulaherbalfinal.Adapter;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.aulaherbalfinal.Model.DataModel;
import com.example.aulaherbalfinal.R;
import java.text.NumberFormat;
import java.util.List;
import java.util.Locale;
public class AdapterDataPembelian extends RecyclerView.Adapter<AdapterDataPembelian.HolderDataPembelian>{
private Context ctx;
private List<DataModel> listDataPembelian;
private int count;
public AdapterDataPembelian(Context ctx, List<DataModel> listDataPembelian) {
this.ctx = ctx;
this.listDataPembelian = listDataPembelian;
}
#NonNull
#Override
public HolderDataPembelian onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View layout = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_item_pembelian, parent, false);
HolderDataPembelian holder = new HolderDataPembelian(layout);
return holder;
}
#Override
public void onBindViewHolder(#NonNull HolderDataPembelian holder, int position) {
DataModel dm = listDataPembelian.get(position);
holder.tvId.setText(String.valueOf(dm.getId()));
holder.tvBarang.setText(dm.getBarang());
holder.tvStok.setText("Stok : "+String.valueOf(dm.getStok()));
holder.tvHarga.setText(formatRupiah(Double.parseDouble(String.valueOf(dm.getHarga()))));
holder.jmlBarang.setText(String.valueOf(dm.getQuantity()));
//holder.totalHarga.setText(String.valueOf(dm.getTotalHarga()));
Intent intent = new Intent("custom-message");
holder.btnRemove.setOnClickListener(v -> {
minusCartItem(holder,listDataPembelian.get(position));
});
holder.btnAdd.setOnClickListener(v -> {
plusCartItem(holder,listDataPembelian.get(position));
});
}
private void plusCartItem(HolderDataPembelian holder, DataModel dataModel) {
dataModel.setQuantity(dataModel.getQuantity()+1);
//dataModel.setTotalHarga(Integer.parseInt(String.valueOf(dataModel.getQuantity()*Double.parseDouble(String.valueOf(dataModel.getHarga())))));
holder.jmlBarang.setText(new StringBuilder().append(dataModel.getQuantity()));
}
private void minusCartItem(HolderDataPembelian holder, DataModel dataModel) {
if (dataModel.getQuantity() > 0){
dataModel.setQuantity(dataModel.getQuantity()-1);
//dataModel.setTotalHarga(Integer.parseInt(String.valueOf(dataModel.getQuantity()*Double.parseDouble(String.valueOf(dataModel.getHarga())))));
holder.jmlBarang.setText(new StringBuilder().append(dataModel.getQuantity()));
} else {
holder.jmlBarang.setText("0");
}
}
#Override
public int getItemCount() {
return listDataPembelian.size();
}
public class HolderDataPembelian extends RecyclerView.ViewHolder {
TextView tvId, tvBarang, tvStok, tvHarga;
Button btnAdd, btnRemove;
TextView jmlBarang, totalHarga;
public HolderDataPembelian(#NonNull View itemView) {
super(itemView);
tvId = itemView.findViewById(R.id.tv_id);
tvBarang = itemView.findViewById(R.id.tv_barang);
tvStok = itemView.findViewById(R.id.tv_stok);
tvHarga = itemView.findViewById(R.id.tv_harga);
btnAdd = itemView.findViewById(R.id.btn_add);
btnRemove = itemView.findViewById(R.id.btn_remove);
jmlBarang = itemView.findViewById(R.id.jml_barang);
totalHarga = itemView.findViewById(R.id.total_harga);
}
}
private String formatRupiah(Double number){
Locale localeID = new Locale("IND", "ID");
NumberFormat numberFormat = NumberFormat.getCurrencyInstance(localeID);
String formatRupiah = numberFormat.format(number);
String[] split = formatRupiah.split(",");
int length = split[0].length();
return split[0].substring(0,2)+". "+split[0].substring(2,length);
}
public int getTotalPrice(){
int totalPrice = 0;
for (int i=0 i<listDataPembelian.size(); i++){
}
}
}
And here is my Activity
package com.example.aulaherbalfinal.Activity;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import androidx.localbroadcastmanager.content.LocalBroadcastManager;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.swiperefreshlayout.widget.SwipeRefreshLayout;
import android.annotation.SuppressLint;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.view.MenuItem;
import android.view.MotionEvent;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import com.example.aulaherbalfinal.API.APIRequestData;
import com.example.aulaherbalfinal.API.RetroServer;
import com.example.aulaherbalfinal.Adapter.AdapterDataPembelian;
import com.example.aulaherbalfinal.Model.DataModel;
import com.example.aulaherbalfinal.Model.ResponseModel;
import com.example.aulaherbalfinal.R;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class PembelianActivity extends AppCompatActivity {
private RecyclerView rvData;
private RecyclerView.Adapter adData;
private RecyclerView.LayoutManager lmData;
private List<DataModel> listDataPembelian = new ArrayList<>();
private SwipeRefreshLayout srlData;
private ProgressBar pbData;
private TextView totalHarga;
private EditText jmlBarang;
#SuppressLint("ClickableViewAccessibility")
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pembelian);
rvData = findViewById(R.id.rv_data);
lmData = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
rvData.setLayoutManager(lmData);
srlData = findViewById(R.id.srl_data);
pbData = findViewById(R.id.pb_data);
totalHarga = findViewById(R.id.total_harga);
jmlBarang = findViewById(R.id.jml_barang);
totalHarga = findViewById(R.id.total_harga);
//retrieveData();
CardView cvTotal = findViewById(R.id.cv_total);
rvData.setOnTouchListener(new View.OnTouchListener() {
#Override
public boolean onTouch(View v, MotionEvent event) {
if (event.getAction() == MotionEvent.ACTION_MOVE){
cvTotal.setVisibility(View.INVISIBLE);
}
if (event.getAction() == MotionEvent.ACTION_UP){
cvTotal.setVisibility(View.VISIBLE);
}
return false;
}
});
BottomNavigationView bottom_navigation = findViewById(R.id.bottom_navigation);
bottom_navigation.setItemIconTintList(null);
bottom_navigation.setSelectedItemId(R.id.navigation_pembelian);
ImageView profile =findViewById(R.id.profile);
profile.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(PembelianActivity.this, ProfileActivity.class);
startActivity(intent);
finish();
}
});
bottom_navigation.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch ( (item.getItemId())){
case R.id.navigation_stok:
startActivity(new Intent(getApplicationContext(), MainActivity.class));
overridePendingTransition(0, 0);
return true;
case R.id.navigation_pembelian:
return true;
case R.id.navigation_penjualan:
startActivity(new Intent(getApplicationContext(), PenjualanActivity.class));
overridePendingTransition(0, 0);
return true;
}
return false;
}
});
srlData.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
srlData.setRefreshing(true);
retrieveData();
srlData.setRefreshing(false);
}
});
}
#Override
protected void onResume() {
super.onResume();
retrieveData();
}
public void retrieveData(){
pbData.setVisibility(View.VISIBLE);
APIRequestData ardData = RetroServer.konekRetrofit().create(APIRequestData.class);
Call<ResponseModel> tampildata = ardData.ardRetrieveData();
tampildata.enqueue(new Callback<ResponseModel>() {
#Override
public void onResponse(Call<ResponseModel> call, Response<ResponseModel> response) {
int kode = response.body().getKode();
String pesan = response.body().getPesan();
//Toast.makeText(MainActivity.this, "Kode : "+kode+" | Pesan : "+pesan, Toast.LENGTH_SHORT).show();
listDataPembelian = response.body().getData();
adData = new AdapterDataPembelian(PembelianActivity.this, listDataPembelian);
rvData.setAdapter(adData);
adData.notifyDataSetChanged();
pbData.setVisibility(View.INVISIBLE);
}
#Override
public void onFailure(Call<ResponseModel> call, Throwable t) {
Toast.makeText(PembelianActivity.this, "Gagal Menghubungi Server", Toast.LENGTH_SHORT).show();
pbData.setVisibility(View.INVISIBLE);
}
});
}
}
Here is my app

I would do something like this:
Create an Interface for your activity to implement:
public interface CallbackIF {
double tally(double amount, int quantity)
}
public class PembelianActivity extends AppCompatActivity implements CallbackIF {
#Override
public double tally(double amount, int quantity) {
return amount * quantity;
}
}
Then when you initialize your recyclerview adapter pass in the interface like so:
adData = new AdapterDataPembelian(PembelianActivity.this, listDataPembelian, PembelianActivity.this);
And change your constructor for the data adapter to be
private CallbackIF callback;
public AdapterDataPembelian(Context ctx, List<DataModel> listDataPembelian, CallbackIF callback) {
this.ctx = ctx;
this.listDataPembelian = listDataPembelian;
this.callback = callback;
}
Then in your onClicklistener for your list / wherever you want to trigger a tally just call
double value = callback.tally(amount, quantity);
If you have any questions please ask

JSON data is showing null after publishing my app on google play

JSON data is showing null after publishing my app on google play, But it shows the data in the emulator while running the non published app sourcecode. The data is coming from the Database online from external server.The json data is visible in the URL, But is shows null in my published app. What could be the reason??.....
PLEASE HELP ME
This is my MainActivity
import android.app.SearchManager;
import android.content.Context;
import android.content.Intent;
import android.graphics.Color;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
import androidx.annotation.RequiresApi;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.SearchView;
import androidx.appcompat.widget.Toolbar;
import androidx.recyclerview.widget.DefaultItemAnimator;
import androidx.recyclerview.widget.DividerItemDecoration;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonArrayRequest;
import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import org.json.JSONArray;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
public class JUR extends AppCompatActivity implements jurAdapter.JURAdapterListener {
private static final String TAG = MainActivity.class.getSimpleName();
private RecyclerView recyclerView2;
private List<JURlist> jurList;
private jurAdapter mAdapter;
private SearchView searchView;
ProgressBar progressBar2;
static {
System.loadLibrary("keys");
}
public native String getJUR();
public native String geturl2();
String getJUR = URLEncoder.encode(getJUR());
String geturl2 = URLEncoder.encode(geturl2());
// url to fetch contacts json
private final String URL = "https://"+geturl2+"/...../"+getJUR;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_jur);
progressBar2 = findViewById(R.id.progress2);
progressBar2.setVisibility(View.VISIBLE);
Toolbar toolbar2 = findViewById(R.id.toolbar2);
setSupportActionBar(toolbar2);
// toolbar fancy stuff
// getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setTitle(R.string.toolbar_JUR);
recyclerView2 = findViewById(R.id.recycler_view2);
jurList = new ArrayList<>();
mAdapter = new jurAdapter(this, jurList, this);
// white background notification bar
whiteNotificationBar(recyclerView2);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView2.setLayoutManager(mLayoutManager);
recyclerView2.setItemAnimator(new DefaultItemAnimator());
recyclerView2.addItemDecoration(new MyDividerItemDecoration(this, DividerItemDecoration.VERTICAL, 36));
recyclerView2.setAdapter(mAdapter);
fetchJUR();
}
/**
* fetches json by making http calls
*/
private void fetchJUR() {
JsonArrayRequest request = new JsonArrayRequest(URL,
new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
if (response == null) {
Toast.makeText(getApplicationContext(), "Couldn't fetch JURISDICTION Pleas try again.", Toast.LENGTH_LONG).show();
return;
}
List<JURlist> items = new Gson().fromJson(response.toString(), new TypeToken<List<JURlist>>() {
}.getType());
// adding contacts to contacts list
jurList.clear();
jurList.addAll(items);
// refreshing recycler view
mAdapter.notifyDataSetChanged();
progressBar2.setVisibility(View.GONE);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
// error in getting json
Log.e(TAG, "Error: " + error.getMessage());
Toast.makeText(getApplicationContext(), "Error: " + error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
APP.getInstance().addToRequestQueue(request);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
// Associate searchable configuration with the SearchView
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
searchView = (SearchView) menu.findItem(R.id.action_search)
.getActionView();
searchView.setSearchableInfo(searchManager
.getSearchableInfo(getComponentName()));
searchView.setMaxWidth(Integer.MAX_VALUE);
// listening to search query text change
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
// filter recycler view when query submitted
mAdapter.getFilter().filter(query);
return false;
}
#Override
public boolean onQueryTextChange(String query) {
// filter recycler view when text is changed
mAdapter.getFilter().filter(query);
return false;
}
});
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_search) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public void onBackPressed() {
// close search view on back button pressed
if (!searchView.isIconified()) {
searchView.setIconified(true);
return;
}
super.onBackPressed();
}
private void whiteNotificationBar(View view) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
int flags = view.getSystemUiVisibility();
flags |= View.SYSTEM_UI_FLAG_LIGHT_STATUS_BAR;
view.setSystemUiVisibility(flags);
getWindow().setStatusBarColor(Color.WHITE);
}
}
#Override
public void onJURSelected(JURlist jur) {
Toast.makeText(getApplicationContext(), "Selected: " + jur.getSTATE() + ", " + jur.getZONE(), Toast.LENGTH_LONG).show();
}
}
This is the Adapter
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class jurAdapter extends RecyclerView.Adapter<jurAdapter.MyViewHolder>
implements Filterable {
private Context context;
private List<JURlist> JuRlist;
private List<JURlist> JURlistFiltered;
private JURAdapterListener listener;
public class MyViewHolder extends RecyclerView.ViewHolder {
public TextView STATE, ZONE, COM, DIVI, RANAME, RANGE1;
// public ImageView thumbnail;
public MyViewHolder(View view) {
super(view);
STATE = view.findViewById(R.id.STATE);
ZONE = view.findViewById(R.id.ZONE);
COM = view.findViewById(R.id.COM);
DIVI = view.findViewById(R.id.DIVI);
RANAME = view.findViewById(R.id.RANAME);
RANGE1 = view.findViewById(R.id.RANGE1);
// thumbnail = view.findViewById(R.id.thumbnail);
view.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
// send selected contact in callback
listener.onJURSelected(JURlistFiltered.get(getAdapterPosition()));
}
});
}
}
public jurAdapter(Context context, List<JURlist> JURLIST, JURAdapterListener listener) {
this.context = context;
this.listener = listener;
this.JuRlist = JURLIST;
this.JURlistFiltered = JURLIST;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent1, int viewType1) {
View itemView = LayoutInflater.from(parent1.getContext())
.inflate(R.layout.jur_item_row, parent1, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
final JURlist jurlist = JURlistFiltered.get(position);
holder.STATE.setText("STATE : "+jurlist.getSTATE()+"\r\n") ;
holder.ZONE.setText("ZONE : "+jurlist.getZONE()+"\r\n");
holder.COM.setText("COMMISSIONERATE NAME : "+jurlist.getCOM()+"\r\n");
holder.DIVI.setText("DIVISION NAME : "+jurlist.getDIVI()+"\r\n");
holder.RANAME.setText("RANGE NAME : "+jurlist.getRANAME()+"\r\n");
holder.RANGE1.setText("RANGE JURISDICTION : \r\n"+jurlist.getRANGE1());
// Glide.with(context)
// .load(contact.getImage())
// .apply(RequestOptions.circleCropTransform())
// .into(holder.thumbnail);
}
#Override
public int getItemCount() {
return JURlistFiltered.size();
}
#Override
public Filter getFilter() {
return new Filter() {
#Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charString = charSequence.toString();
if (charString.isEmpty()) {
JURlistFiltered = JuRlist;
} else {
List<JURlist> filteredList = new ArrayList<>();
for (JURlist row : JuRlist) {
// name match condition. this might differ depending on your requirement
// here we are looking for name or phone number match
if (row.getSTATE().toLowerCase().contains(charString.toLowerCase()) || row.getZONE().toLowerCase().contains(charString.toLowerCase()) || row.getCOM().toLowerCase().contains(charString.toLowerCase()) || row.getDIVI().toLowerCase().contains(charString.toLowerCase()) || row.getRANAME().toLowerCase().contains(charString.toLowerCase()) || row.getRANGE1().toLowerCase().contains(charString.toLowerCase())) {
filteredList.add(row);
}
}
JURlistFiltered = filteredList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = JURlistFiltered;
return filterResults;
}
#Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
JURlistFiltered = (ArrayList<JURlist>) filterResults.values;
notifyDataSetChanged();
}
};
}
public interface JURAdapterListener {
void onJURSelected(JURlist jur);
}
}```
[1]: https://i.stack.imgur.com/vcWmG.jpg

adding List<String> friends = new ArrayList<>(); to customlistview

Cannot add List to custom list view. im having trouble with String[] , i was trying to get my users from firebase database and stores it to my
private ArrayList<UserInfo> userInfos;
userInfos=new ArrayList<>();
but when running it to emulator my listview is showing blank,i've tried checking the List<String> friends = new ArrayList<>(); and my users are available., Could anyone please help me with this?
My MainActivityCustonlistViewnew.java
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import androidx.appcompat.app.AppCompatActivity;
import androidx.appcompat.widget.SearchView;
import androidx.appcompat.widget.Toolbar;
public class MainActivityCustonlistViewnew extends AppCompatActivity {
private ArrayList<UserInfo> userInfos;
private CustomListAdapter customListAdapter;
private ListView customListView;
private FirebaseDatabase firebaseDatabase = FirebaseDatabase.getInstance();
private DatabaseReference databaseReference = firebaseDatabase.getReference();
private DatabaseReference UserData = databaseReference.child("Users");
private List<String> friends = new ArrayList<>();
private String[] names ;
private String[] professions={
"Rank 1",
"Rank 2",
"Rank 3"
};
private int[] photos={
R.drawable.sample_5,
R.drawable.sample_1,
R.drawable.sample_6
};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maincustomlistview);
setSupportActionBar((Toolbar)findViewById(R.id.toolbar));
// ArrayList arrayList = new ArrayList(friends);
ValueEventListener eventListener = new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for(DataSnapshot ds : dataSnapshot.getChildren()) {
String friend = ds.getKey();
friends.add(friend);
}
}
#Override
public void onCancelled(DatabaseError databaseError) {}
};
UserData.addListenerForSingleValueEvent(eventListener);
customListView=(ListView)findViewById(R.id.custom_list_view);
userInfos=new ArrayList<>();
Arrays.sort(names, String.CASE_INSENSITIVE_ORDER);
customListAdapter=new CustomListAdapter(userInfos,MainActivityCustonlistViewnew.this);
customListView.setAdapter(customListAdapter);
getDatas();
customListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
Toast.makeText(MainActivityCustonlistViewnew.this, "Name : " + names[i] + "\n Profession : " + professions[i], Toast.LENGTH_SHORT).show();
}
});
//sample-----
}
// getting all the datas
private void getDatas(){
for(int count=0;count<names.length;count++){
userInfos.add(new UserInfo(names[count],professions[count],photos[count]));
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.search_option,menu);
MenuItem menuItem=menu.findItem(R.id.search);
SearchView searchView=(SearchView)menuItem.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return true;
}
#Override
public boolean onQueryTextChange(String newText) {
newText=newText.toString();
ArrayList<UserInfo> newUserInfos=new ArrayList<>();
for(UserInfo userInfo:userInfos){
String name=userInfo.getName().toLowerCase();
String profession=userInfo.getProfession().toLowerCase();
if(name.contains(newText) || profession.contains(newText)){
newUserInfos.add(userInfo);
}
}
customListAdapter.filterResult(newUserInfos);
customListAdapter.notifyDataSetChanged();
return false;
}
});
return super.onCreateOptionsMenu(menu);
}
}
my Userinfo.java
public class UserInfo {
private String name,profession;
private int photo;
public UserInfo(){}
public UserInfo(String name, String profession, int photo) {
this.name = name;
this.profession = profession;
this.photo = photo;
}
public String getName() {
return name;
}
public String getProfession() {
return profession;
}
public int getPhoto() {
return photo;
}
}
my customlistAdapter
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.PopupMenu;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
public class CustomListAdapter extends BaseAdapter implements View.OnClickListener{
private ArrayList<UserInfo> userInfos;
private Context context;
public CustomListAdapter(ArrayList<UserInfo> userInfos, Context context) {
this.userInfos = userInfos;
this.context = context;
}
#Override
public int getCount() {
return userInfos.size();
}
#Override
public Object getItem(int i) {
return null;
}
#Override
public long getItemId(int i) {
return 0;
}
#Override
public View getView(int i, View view, ViewGroup viewGroup) {
LayoutInflater layoutInflater=(LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view=layoutInflater.inflate(R.layout.custom_list_view_layout,null);
ImageView photo,option;
if(view==null){
photo=new ImageView(context);
}
UserInfo userInfo=userInfos.get(i);
photo=(ImageView)view.findViewById(R.id.photo);
option=(ImageView)view.findViewById(R.id.option);
TextView name=(TextView)view.findViewById(R.id.name);
TextView profession=(TextView)view.findViewById(R.id.profession);
photo.setImageResource(userInfo.getPhoto());
name.setText(userInfo.getName());
profession.setText(userInfo.getProfession());
option.setOnClickListener(this);
return view;
}
#Override
public void onClick(View view) {
switch (view.getId()){
case R.id.option:
showPopupMenu(view);
break;
}
}
// getting the popup menu
private void showPopupMenu(View view){
PopupMenu popupMenu=new PopupMenu(context,view);
popupMenu.getMenuInflater().inflate(R.menu.option_menu,popupMenu.getMenu());
popupMenu.show();
popupMenu.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
#Override
public boolean onMenuItemClick(MenuItem menuItem) {
switch (menuItem.getItemId()){
case R.id.edit:
Toast.makeText(context, "Edit !", Toast.LENGTH_SHORT).show();
return true;
case R.id.remove:
Toast.makeText(context, "Remove !", Toast.LENGTH_SHORT).show();
return true;
default:
return false;
}
}
});
}
//file search result
public void filterResult(ArrayList<UserInfo> newUserInfos){
userInfos=new ArrayList<>();
userInfos.addAll(newUserInfos);
notifyDataSetChanged();
}
}

You're adding data from getDatas() but your adapter is already being initialized with empty data. So there are 2 ways :
1 : Initialize and Set adapter after getDatas() call
getDatas();
customListAdapter=new CustomListAdapter(userInfos,MainActivityCustonlistViewnew.this);
customListView.setAdapter(customListAdapter);
2 : Inform adapter about dataset changes using notifyDataSetChanged() method
customListView.setAdapter(customListAdapter);
getDatas();
customListAdapter.notifyDataSetChanged();

customListAdapter=new CustomListAdapter(userInfos,MainActivityCustonlistViewnew.this);
customListView.setAdapter(customListAdapter);
getDatas();
You are doing wrong here. you are calling customListAdapter and setting cusrom data(userInfos) empty here. Because getDatas() method called after customListAdapter . Hence list will be empty. Just interchange the positron.
getDatas();
customListAdapter=new CustomListAdapter(userInfos,MainActivityCustonlistViewnew.this);
customListView.setAdapter(customListAdapter);
Hope It helps.
Thanks
Saurabh
Happy Coding !!!

Data is not binding to android recyclerview

I am new to android. I am trying to download data using the Github api and display in and infinite scrolling RecyclerView, the JSON data is been parsed, but somehow the data is not been attached to the recyclerview.
Here is the code below:
Developer_RV_Adapter.java
package com.davidshare.githubdevelopers;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.List;
/**
* Created by GemShare on 9/6/2017.
*/
public class Developer_RV_Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final int VIEW_TYPE_ITEM = 0;
private final int VIEW_TYPE_LOADING = 1;
private OnLoadMoreListener mOnLoadMoreListener;
private boolean isLoading;
private int visibleThreshold = 10;
private int lastVisibleItem, totalItemCount;
private List<Developer> developerList;
Context context;
RecyclerView recyclerView;
public Developer_RV_Adapter(Context context, List<Developer> developerList, RecyclerView recyclerView) {
this.developerList = developerList;
this.context = context;
this.recyclerView = recyclerView;
final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
if(!isLoading && totalItemCount<=(lastVisibleItem+visibleThreshold)){
if(mOnLoadMoreListener!=null){
mOnLoadMoreListener.onLoadMore();
}
isLoading = true;
}
}
});
}
public void setmOnLoadMoreListener(OnLoadMoreListener mOnLoadMoreListener){
this.mOnLoadMoreListener = mOnLoadMoreListener;
}
#Override
public int getItemViewType(int position){
return developerList.get(position) == null? VIEW_TYPE_LOADING : VIEW_TYPE_ITEM;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if(viewType == VIEW_TYPE_ITEM){
View developerView = LayoutInflater.from(context).inflate(R.layout.developer_list_item, parent, false);
return new DeveloperViewHolder(developerView);
}else if(viewType== VIEW_TYPE_LOADING){
View loadingView = LayoutInflater.from(context).inflate(R.layout.progress_bar_item, parent, false);
return new ProgressViewHolder(loadingView);
}
return null;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
Log.w("binder function", "Just entered the binder");
Developer developer = developerList.get(position);
if(holder instanceof DeveloperViewHolder){
DeveloperViewHolder developerViewHolder = (DeveloperViewHolder) holder;
developerViewHolder.gitNameTv.setText(developer.getGitUsername());
Log.w("binder ", developer.getGitProfileUrl());
developerViewHolder.gitUrlTv.setText(developer.getGitProfileUrl());
developerViewHolder.gitPicUrlTv.setText(developer.getGitProfilePicUrl());
Log.w("profile pic", developer.getGitProfilePicUrl());
Picasso.with(developerViewHolder.gitNameTv.getContext()).load(developer.getGitProfilePicUrl()).transform(new RoundedImage(2)).fit().centerCrop().into(developerViewHolder.profilePicImgV);
}else if (holder instanceof ProgressViewHolder) {
ProgressViewHolder loadingViewHolder = (ProgressViewHolder) holder;
loadingViewHolder.loadingProgress.setIndeterminate(true);
}
}
#Override
public int getItemCount() {
return developerList == null ? 0 : developerList.size();
}
public void setLoaded() {
isLoading = false;
}
public class DeveloperViewHolder extends RecyclerView.ViewHolder{
TextView gitNameTv;
TextView gitUrlTv;
ImageView profilePicImgV;
TextView gitPicUrlTv;
public DeveloperViewHolder(final View itemView) {
super(itemView);
gitNameTv = (TextView) itemView.findViewById(R.id.developerName);
gitUrlTv = (TextView) itemView.findViewById(R.id.developerUrl);
profilePicImgV = (ImageView) itemView.findViewById(R.id.developerPic);
gitPicUrlTv = (TextView) itemView.findViewById(R.id.developerPicUrl);
itemView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
Intent i = new Intent(itemView.getContext(), Profile.class);
i.putExtra("profile_name", gitNameTv.getText().toString());
i.putExtra("profile_url", gitUrlTv.getText().toString());
i.putExtra("profile_pic_url", gitPicUrlTv.getText().toString());
v.getContext().startActivity(i);
}
});
}
}
public static class ProgressViewHolder extends RecyclerView.ViewHolder{
public ProgressBar loadingProgress;
public ProgressViewHolder(View itemView) {
super(itemView);
loadingProgress = (ProgressBar) itemView.findViewById(R.id.loading_progress_bar);
}
}
}
DeveloperList.java
package com.davidshare.githubdevelopers;
import android.app.ProgressDialog;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class DeveloperList extends AppCompatActivity {
List<Developer> developerList;
Developer_RV_Adapter developer_rv_adapter;
Developer developer;
RecyclerView developerRV;
private static final String GIT_BASE_URL = "https://api.github.com/search/users?q=location:";
private static int page = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_developer_list);
developerRV = (RecyclerView) findViewById(R.id.developer_rv);
developerRV.setLayoutManager(new LinearLayoutManager(this));
developerList = new ArrayList<>();
getDevelopersData(prepareQuery("java", "lagos", page));
developer_rv_adapter = new Developer_RV_Adapter(DeveloperList.this, developerList, developerRV);
developerRV.setAdapter(developer_rv_adapter);
developer_rv_adapter.setmOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
developerList.add(null);
developer_rv_adapter.notifyItemInserted(developerList.size()-1);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
developerList.remove(developerList.size()-1);
developer_rv_adapter.notifyItemRemoved(developerList.size());
getDevelopersData(prepareQuery("java", "lagos", page));
developer_rv_adapter.notifyDataSetChanged();
developer_rv_adapter.setLoaded();
}
}, 5000);
}
});
}
the getDevelopersData method uses volley to query the github api and parse the JSON response into a List
public void getDevelopersData(String requestUrl) {
StringRequest jsonSringRequest = new StringRequest(Request.Method.GET, requestUrl, new Response.Listener<String>() {
#Override
public void onResponse(String jsonResponse) {
try {
JSONObject gitJSONOBject = new JSONObject(jsonResponse);
JSONArray gitItemsArray = gitJSONOBject.getJSONArray("items");
for (int i = 0; i < gitItemsArray.length(); i++) {
JSONObject developerObject = gitItemsArray.getJSONObject(i);
developer = new Developer(developerObject.getString("login"),
developerObject.getString("html_url"),
developerObject.getString("avatar_url"));
developerList.add(developer);
Log.w("developer_data ", developer.getGitUsername());
}
Log.w("JSON DATA", "getting the json data");
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError volleyError) {
Log.e("Volley error", volleyError.getMessage());
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonSringRequest);
}
//get the location and language and the page of the api data you want to load
private String prepareQuery(String language, String location, int page){
this.page++;
String queryUrl = GIT_BASE_URL+location+"+language:"+language+"&page="+page+"&per_page=50";
Log.w("Query URL = > ", queryUrl);
return queryUrl;
}
}
Can anyone help me with this?

try to notify adapter in getDevelopersData() after data add to array list like add this line developer_rv_adapter.notifyDataSetChanged();

Instead of notifyItemInserted() inserted use
notifyItemRangedChanged(fromIndex,toIndex);
This will notify the adapter that some set of data is changed among the whole data and it tells the adapter that adapter should refresh the data and reload it into the recyclerView starting from fromIndex to toIndex as passed into the method.
If all data are changed then use :
notifyDataSetChanged();
if only one dataItem is changed then use :
notifyItemChanged(dataPosition);
Also I think this statment is causing problem.Try to remove this statment and check again.
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
developerList.remove(developerList.size()-1);
developer_rv_adapter.notifyItemRemoved(developerList.size());
getDevelopersData(prepareQuery("java", "lagos", page));
developer_rv_adapter.notifyDataSetChanged();
developer_rv_adapter.setLoaded();
}
}, 5000);

The problem was resolved by just adding developer_rv_adapter.notifyDataSetChanged(); just below developerList.add(developer); this notifies the adapter that new items have been added to the list.

Parsing JSON data & Load it in Fragments

Excuse me i already had an Application which Display my Sites articles and Novels in Android the codes in Main Activity to display only one Section
i create in the site 5 sections every section had a different content
i Added items to Navigation Drawers and i defined the fragment and its connectivity but the Problem in the Code i failed so
i want to know how to load Data in 4 Fragments
RecyclerViewAdapter.class
import android.content.Context;
import android.support.v7.widget.CardView;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.squareup.picasso.Picasso;
import java.util.List;
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private int previousPosition = 0;
private List<com.salim3dd.recyclerview_moredata.List_Item> List_Item;
private Context context;
public RecyclerViewAdapter(List<List_Item> list_Item, Context context) {
List_Item = list_Item;
this.context = context;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View menu1 = LayoutInflater.from(viewGroup.getContext()).inflate(
R.layout.row_item, viewGroup, false);
return new MenuItemViewHolder(menu1);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
MenuItemViewHolder menuItemHolder = (MenuItemViewHolder) holder;
menuItemHolder.TextName.setText(List_Item.get(position).getStory());
Picasso.with(context).load(List_Item.get(position).getImg_link()).into(menuItemHolder.imageView);
menuItemHolder.imageView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(context, List_Item.get(position).getStory(), Toast.LENGTH_SHORT).show();
}
});
if (position > previousPosition) { //scrolling DOWN
AnimationUtil.animate(menuItemHolder, true);
} else { // scrolling UP
AnimationUtil.animate(menuItemHolder, false);
}
previousPosition = position;
}
#Override
public int getItemCount() {
return (null != List_Item ? List_Item.size() : 0);
}
protected class MenuItemViewHolder extends RecyclerView.ViewHolder {
private CardView cardView;
private ImageView imageView;
private TextView TextName;
public MenuItemViewHolder(View view) {
super(view);
cardView = (CardView) view.findViewById(R.id.cardView);
imageView = (ImageView) view.findViewById(R.id.imageView);
TextName = (TextView) view.findViewById(R.id.TextName);
}
}
}
MainActivity
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import com.salim3dd.recyclerview_moredata.CheckInternetConnection;
import com.salim3dd.recyclerview_moredata.List_Item;
import com.salim3dd.recyclerview_moredata.R;
import com.salim3dd.recyclerview_moredata.RecyclerViewAdapter;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private RecyclerViewAdapter recyclerView_dAdapter;
public List<List_Item> listItem = new ArrayList<>();
private GridLayoutManager gridLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.m_RecyclerView);
recyclerView.setHasFixedSize(true);
gridLayoutManager = new GridLayoutManager(this, 1);
recyclerView.setLayoutManager(gridLayoutManager);
recyclerView_dAdapter = new RecyclerViewAdapter(listItem, this);
recyclerView.setAdapter(recyclerView_dAdapter);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
if (gridLayoutManager.findLastCompletelyVisibleItemPosition() == listItem.size() - 1) {
Get_All_Users(listItem.get(listItem.size()-1).getId());
}
}
});
Get_All_Users(0);
}
public void Get_All_Users(int limit) {
CheckInternetConnection cic = new CheckInternetConnection(getApplicationContext());
Boolean Ch = cic.isConnectingToInternet();
if (!Ch) {
Toast.makeText(this, R.string.no_internet_connection, Toast.LENGTH_SHORT).show();
} else {
StringRequest stringRequest = new StringRequest(Request.Method.GET,
"Data Link" + limit
,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONArray jsonArray = new JSONArray(response);
JSONObject jsonResponse = jsonArray.getJSONObject(0);
JSONArray jsonArray_usersS = jsonResponse.getJSONArray("All_storys");
for (int i = 0; i < jsonArray_usersS.length(); i++) {
JSONObject responsS = jsonArray_usersS.getJSONObject(i);
int id = responsS.getInt("id");
String story = responsS.getString("story_name");
String img_link = responsS.getString("img_link");
listItem.add(new List_Item(id, story, img_link));
}
recyclerView_dAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue queue = Volley.newRequestQueue(this);
queue.add(stringRequest);
stringRequest.setShouldCache(false);
}
}
}
List Items.class
public class List_Item {
public int id;
public String story;
public String img_link;
public List_Item(int id, String story, String img_link) {
this.id = id;
this.story = story;
this.img_link = img_link;
}
public int getId() {
return id;
}
public String getStory() {
return story;
}
public String getImg_link() {
return img_link;
}
public void setId(int id) {
this.id = id;
}
}