I want to loop through all CardViews and change the text and color of a TextView within a single CardView item using a button click. The following code seems to produce the desired results but I'm not certain that it's the most effective code or even accurate (index).
CustomAdapter
import android.content.Context;
import android.view.LayoutInflater;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class CustomAdapter extends RecyclerView.Adapter<CustomViewHolder> {
private Context context;
private List<MyModel> list;
public CustomAdapter(Context context, List<MyModel> list) {
this.context = context;
this.list = list;
}
#NonNull
#Override
public CustomViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new CustomViewHolder(LayoutInflater.from(context).inflate(R.layout.single_items, parent, false));
}
#Override
public void onBindViewHolder(#NonNull CustomViewHolder holder, int position) {
holder.textName.setText(list.get(position).getName());
holder.textAge.setText(String.valueOf(list.get(position).getAge()));
}
#Override
public int getItemCount() {
return list.size();
}
}
CustomViewHolder
import android.view.View;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
public class CustomViewHolder extends RecyclerView.ViewHolder {
public TextView textName, textAge;
public CustomViewHolder(#NonNull View itemView) {
super(itemView);
textName = itemView.findViewById(R.id.textName);
textAge = itemView.findViewById(R.id.textAge);
}
}
MainActivity
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
List<MyModel> myModelList;
CustomAdapter customAdapter;
private Button button1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
loadData();
}
private void loadData() {
recyclerView = findViewById(R.id.recycler_main);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(this, 1));
myModelList = new ArrayList<>();
myModelList.add(new MyModel("Joe", 21));
myModelList.add(new MyModel("Jane", 26));
myModelList.add(new MyModel("Kyle", 19));
myModelList.add(new MyModel("Scott", 30));
customAdapter = new CustomAdapter(this, myModelList);
recyclerView.setAdapter(customAdapter);
}
public void onClickBtn(View v)
{
String searchString = "Kyle";
for (int x = recyclerView.getChildCount(), i = 0; i < x; ++i) {
RecyclerView.ViewHolder holder = recyclerView.getChildViewHolder(recyclerView.getChildAt(i));
TextView txtName = holder.itemView.findViewById(R.id.textName);
if (txtName.getText().toString().equals(searchString.toString())) {
txtName.setText("Found " + txtName.getText().toString());
txtName.setTextColor(Color.GREEN);
customAdapter.notifyItemChanged(x);
}
}
}
}
MyModel
public class MyModel {
String name = "";
int age = 0;
public MyModel(String name, int age) {
this.name = name;
this.age = age;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
It's important that I iterate through the list in button click event. Functionality to be changed later. Really appreciate any advice and feedback. Thanks a lot.
Related
I am working on an Inventory Management app for which I tried to retrieve data from my fire store database but I am not able to get why . I created a Adapter file and and Data file and linked them with main file
My Code for Main Activity file
package com.example.inventorymanagment;
import android.annotation.SuppressLint;
import android.os.Bundle;
import android.util.Log;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.firebase.firestore.DocumentChange;
import com.google.firebase.firestore.FirebaseFirestore;
import com.google.firebase.firestore.Query;
import java.util.ArrayList;
public class Measure extends AppCompatActivity {
RecyclerView recyclerView;
ArrayList<data> itemList;
adapter adapter;
FirebaseFirestore db;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_measure);
recyclerView= findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
db = FirebaseFirestore.getInstance();
itemList= new ArrayList<>();
adapter= new adapter(Measure.this,itemList);
recyclerView.setAdapter(adapter);
getdata();
}
#SuppressLint("NotifyDataSetChanged")
private void getdata() {
db.collection("Inventory").orderBy("Name", Query.Direction.ASCENDING)
.addSnapshotListener((value, error) -> {
if(error!=null){
Log.e("Firestore error",error.getMessage());
return;
}
for(DocumentChange dc : value.getDocumentChanges()){
if(dc.getType() == DocumentChange.Type.ADDED){
itemList.add(dc.getDocument().toObject(data.class));
}
adapter.notifyDataSetChanged();
}
});
}
}
Code for Adapter file
package com.example.inventorymanagment;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class adapter extends RecyclerView.Adapter<adapter.MyViewHolder>{
Context context;
ArrayList<data> itemList;
public adapter(Context context, ArrayList<data>itemList)
{
this.context = context;
this.itemList = itemList;
}
#NonNull
#Override
public adapter.MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.item,parent,false);
return new MyViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
data data = itemList.get(position);
holder.Name.setText(data.Name);
holder.Quantity.setText(String.valueOf(data.Quantity));
}
#Override
public int getItemCount() {
return itemList.size();
}
public static class MyViewHolder extends RecyclerView.ViewHolder{
TextView Name, Quantity;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
Name=itemView.findViewById(R.id.name);
Quantity=itemView.findViewById((R.id.quantity));
}
}
}
My Code for Data file
package com.example.inventorymanagment;
public class data {
String Name;
long Quantity;
public data(){}
public data(String name, long quantity) {
Name = name;
Quantity = quantity;
}
public String getName() {
return Name;
}
public void setName(String name) {
Name = name;
}
public long getQuantity() {
return Quantity;
}
public void setQuantity(long quantity) {
Quantity = quantity;
}
}
please help me find my error
In onBindViewHolder(#NonNull MyViewHolder holder, int position) {
data data = itemList.get(position);
holder.Name.setText(data.Name);
holder.Quantity.setText(String.valueOf(data.Quantity));
try setting data.getName() instead of data.Name
I need to open another activity from a custom adapter, just like a list and then when I click on that, it will take to another activity and get a data from database and show it in the text view,
the problem is in SearchAdapter.java in the context.startActivity(intent);
here's my searchAdapter.java
package Adapter;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
//import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.manualdiagnosiskeperawatan.R;
import com.example.manualdiagnosiskeperawatan.isiDiagnosis;
import java.util.List;
import Model.Daftar;
class SearchViewHolder extends RecyclerView.ViewHolder{
public TextView judul, diagnosis;
public SearchViewHolder(View itemView) {
super(itemView);
judul = itemView.findViewById(R.id.judul);
diagnosis = itemView.findViewById(R.id.textViewIsi);
}
}
public class SearchAdapter extends RecyclerView.Adapter<SearchViewHolder>
{
private Context context;
private List<Daftar> data;
public SearchAdapter(Context context, List<Daftar> data) {
this.context = context;
this.data = data;
}
#Override
public SearchViewHolder onCreateViewHolder( ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View itemView = inflater.inflate(R.layout.layout_item,parent,false);
return new SearchViewHolder(itemView);
}
#Override
public void onBindViewHolder(final SearchViewHolder holder, final int position)
{
holder.judul.setText(data.get(position).getJudul());
//open activity
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(context, data.get(position).getDiagnosis(),Toast.LENGTH_SHORT).show();
//this code, isn't working
Intent intent = new Intent(context, isiDiagnosis.class);
intent.putExtra("did",data.get(position).getDid());
context.startActivity(intent);
}
});
}
#Override
public int getItemCount() {
return data.size();
}
}
and here is my isiDiagnosis.java which will be opened when I clicked the list from the SearchAdapter.java
package com.example.manualdiagnosiskeperawatan;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.widget.TextView;
import com.mancj.materialsearchbar.MaterialSearchBar;
import org.w3c.dom.Text;
import java.util.ArrayList;
import java.util.List;
import Adapter.SearchAdapter;
import Database.Database;
import Model.Daftar;
public class isiDiagnosis extends AppCompatActivity {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
SearchAdapter adapter;
Database database;
List<Daftar> daftars = new ArrayList<>();
private TextView judul, diagnosis;
private String DID = "judul";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_isi_diagnosis);
DID = getIntent().getStringExtra("judul");
database = new Database(this);
diagnosis = (TextView) findViewById(R.id.textViewIsi);
//init DB
loadData(DID);
}
private void loadData(String did) {
//i don't really know how to code, just see from the youtube, so i made this myself
// database.getDiagnosis();
// String diagnosis = daftars.get(database.getDiagnosis());
// database.getDiagnosis(diagnosis.setText());
}
}
here's my searchDiagnosis.java
package com.example.manualdiagnosiskeperawatan;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.widget.ListViewCompat;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.Adapter;
import android.widget.ListView;
import com.mancj.materialsearchbar.MaterialSearchBar;
import java.util.ArrayList;
import java.util.List;
import Adapter.SearchAdapter;
import Database.Database;
public class searchDiagnosis extends AppCompatActivity {
RecyclerView recyclerView;
RecyclerView.LayoutManager layoutManager;
SearchAdapter adapter;
Database database;
MaterialSearchBar materialSearchBar;
List<String> suggestList = new ArrayList<>();
#Override
protected void onStart() {
super.onStart();
adapter = new SearchAdapter(getBaseContext(),database.getDaftar());
recyclerView.setAdapter(adapter);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search_diagnosis);
//init view
recyclerView = (RecyclerView) findViewById(R.id.recycler_search);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
materialSearchBar =(MaterialSearchBar) findViewById(R.id.search_bar);
//init DB
database = new Database(this);
//Setup search bar
materialSearchBar.setHint("Search");
materialSearchBar.setCardViewElevation(10);
loadSuggestList();
materialSearchBar.addTextChangeListener(new TextWatcher() {
#Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
#Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
List<String> suggest = new ArrayList<>();
for(String search:suggestList){
if(search.toLowerCase().contains(materialSearchBar.getText().toLowerCase()))
suggest.add(search);
}
materialSearchBar.setLastSuggestions(suggest);
}
#Override
public void afterTextChanged(Editable s) {
}
});
materialSearchBar.setOnSearchActionListener(new MaterialSearchBar.OnSearchActionListener() {
#Override
public void onSearchStateChanged(boolean enabled) {
if(!enabled) {
// recyclerView.setAdapter(adapter);
//if close Search, just restore default
adapter = new SearchAdapter(getBaseContext(),database.getDaftar());
recyclerView.setAdapter(adapter);
}
}
#Override
public void onSearchConfirmed(CharSequence text) {
startSearch(text.toString());
}
#Override
public void onButtonClicked(int buttonCode) {
}
});
//Init adapter default set all result
adapter = new SearchAdapter(this,database.getDaftar());
}
private void startSearch(String text) {
adapter = new SearchAdapter(this,database.getDataByJudul(text));
recyclerView.setAdapter(adapter);
}
private void loadSuggestList() {
suggestList = database.getJudul();
materialSearchBar.setLastSuggestions(suggestList);
}
}
here's my Daftar.class
package Model;
public class Daftar {
public int id;
public String did, judul, diagnosis;
public Daftar(int id,String did, String judul, String diagnosis) {
this.id = id;
this.did = did;
this.judul = judul;
this.diagnosis = diagnosis;
}
public Daftar() {
}
public int getId() {
return id;
}
public String getDid() {
return did;
}
public void setDid(String did) {
this.did = did;
}
public void setId(int id) {
this.id = id;
}
public String getJudul() {
return judul;
}
public void setJudul(String judul) {
this.judul = judul;
}
public String getDiagnosis() {
return diagnosis;
}
public void setDiagnosis(String diagnosis) {
this.diagnosis = diagnosis;
}
}
Look I don't know what kind of database is this, but I know that you are not receiving the intent extra correctly:
In your isiDiagnosis:
............
//get the did like this
DID = getIntent().getStringExtra("did");
.......
loadData(DID);
//loading the data is up to you according to the database
private void loadData(String did) {.........}
I want to store my data in realm database, then retrieve and show it in a recyclerview. All my code is correct in my point of view but it gives me an error about null pointer exception. Despite my efforts I was unable to solve it.
Main Activty Class
package com.deitel.realmrecyclerviewspinnerpriority;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.database.Cursor;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageButton;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
import com.deitel.realmrecyclerviewspinnerpriority.Adapter.AdapterClass;
import com.deitel.realmrecyclerviewspinnerpriority.Database.RelmHelper;
import com.deitel.realmrecyclerviewspinnerpriority.Modelclass.ModelClass;
import java.util.ArrayList;
import io.realm.Realm;
import io.realm.RealmConfiguration;
import io.realm.RealmResults;
public class MainActivity extends AppCompatActivity {
private static final String TAG="MainActivity";
Realm realm;
EditText text_name;
EditText text_details;
ImageButton btn_ascending,btn_descending;
RecyclerView rv;
Spinner spinner;
TextView text_data;
Button btn_save,btn_view;
ArrayList<String> itemslist;
AdapterClass addapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
text_name = findViewById(R.id.text_name);
text_details = findViewById(R.id.text_details);
text_data=findViewById(R.id.text_data);
btn_save=findViewById(R.id.btn_show);
btn_view=findViewById(R.id.btn_view);
btn_save = findViewById(R.id.btn_show);
rv = findViewById(R.id.recyclerview);
btn_ascending=findViewById(R.id.btn_ascending);
btn_descending=findViewById(R.id.btn_descneding);
rv.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
final RelmHelper helper=new RelmHelper(realm);
itemslist=helper.retrievedata();
addapter = new AdapterClass(MainActivity.this,itemslist);
rv.setAdapter(addapter);
spinner = findViewById(R.id.spinner);
final ArrayList<Integer> arrayList = new ArrayList<>();
arrayList.add(1);
arrayList.add(2);
arrayList.add(3);
arrayList.add(4);
arrayList.add(5);
arrayList.add(6);
arrayList.add(7);
arrayList.add(8);
arrayList.add(9);
arrayList.add(10);
arrayList.add(11);
arrayList.add(12);
arrayList.add(13);
final ArrayAdapter<Integer> adapter = new ArrayAdapter<Integer>(this, android.R.layout.simple_spinner_item, arrayList);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);
btn_save.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ModelClass md=new ModelClass();
md.setName(text_name.getText().toString());
md.setDetails(text_details.getText().toString());
/*save data*/
RelmHelper helper=new RelmHelper(realm);
helper.savedata(md);
}
});
}
}
```
MY REALM HELPER CLASS
```
package com.deitel.realmrecyclerviewspinnerpriority.Database;
import android.view.Display;
import com.deitel.realmrecyclerviewspinnerpriority.Modelclass.ModelClass;
import java.util.ArrayList;
import io.realm.Realm;
import io.realm.RealmResults;
public class RelmHelper {
Realm realm;
public RelmHelper(Realm realm) {
this.realm = realm;
}
public void savedata(final ModelClass modelClass){
realm.executeTransactionAsync(new Realm.Transaction() {
#Override
public void execute(Realm realm) {
ModelClass md=realm.copyToRealm(modelClass);
}
});
}
public ArrayList<String> retrievedata(){
ArrayList<String> modelclassdata=new ArrayList<>();
RealmResults<ModelClass> modelClass=realm.where(ModelClass.class).findAll();
for (ModelClass MD:modelClass){
modelclassdata.add(MD.getName());
modelclassdata.add(MD.getDetails());
// modelclassdata.add(MD.getPriority());
}
return modelclassdata;
}
}
```
Model Class
```
package com.deitel.realmrecyclerviewspinnerpriority.Modelclass;
import io.realm.RealmObject;
public class ModelClass extends RealmObject {
private String name;
private String details;
// private int priority;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getDetails() {
return details;
}
public void setDetails(String details) {
this.details = details;
}
// public int getPriority() {
// return priority;
// }
//
// public void setPriority(int priority) {
// this.priority = priority;
// }
}
```
Adapter Class
```[![enter image description here][1]][1]
package com.deitel.realmrecyclerviewspinnerpriority.Adapter;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageButton;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.deitel.realmrecyclerviewspinnerpriority.Modelclass.ModelClass;
import com.deitel.realmrecyclerviewspinnerpriority.R;
import java.util.ArrayList;
import java.util.List;
public class AdapterClass extends RecyclerView.Adapter<AdapterClass.Viewholder> {
ArrayList<String> modelClassList;
Context context;
public AdapterClass(#NonNull Context context,ArrayList<String> modelClassList){
this.modelClassList=modelClassList;
this.context=context;
}
#NonNull
#Override
public AdapterClass.Viewholder onCreateViewHolder(#NonNull ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.custom_cardview_layout, viewGroup, false);
Viewholder holder = new Viewholder(view);
return holder;
}
#Override
public void onBindViewHolder(#NonNull AdapterClass.Viewholder holder, final int position) {
holder.textView_name.setText("Name :" + modelClassList.get(position));
holder.textView_details.setText("Details : " + modelClassList.get(position));
// holder.textView_priority.setText("Priority : " + modelClassList.get(position));
// holder.btn_delete.setOnClickListener(new View.OnClickListener() {
// #Override
// public void onClick(View v) {
// modelClassList.remove(position);
// notifyItemRemoved(position);
// notifyItemRangeChanged(position,modelClassList.size());
// notifyDataSetChanged();
// }
// });
}
#Override
public int getItemCount() {
return modelClassList.size();
}
public class Viewholder extends RecyclerView.ViewHolder {
TextView textView_name;
TextView textView_details;
TextView textView_priority;
ImageButton btn_delete;
public Viewholder(#NonNull View view) {
super(view);
textView_name = view.findViewById(R.id.textview_name);
textView_details = view.findViewById(R.id.textview_details);
textView_priority = view.findViewById(R.id.textview_priotity);
btn_delete=view.findViewById(R.id.btn_delete);
}
}
}
I have this problem with this app. The does not show me the Items quantity and price, But they show the name of the item, and I don't have any errors when I run the up.Please give me an advice if you can.
The cartactivity code :
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
import com.example.bartertrader.Model.Cart;
import com.example.bartertrader.Prevalent.Prevalent;
import com.example.bartertrader.ViewHolder.CartViewHolder;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class CartActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private RecyclerView.LayoutManager layoutManager;
private Button NextProcessBtn;
private TextView txtTotalAmount;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_cart);
recyclerView= findViewById(R.id.cart_list);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
NextProcessBtn = (Button) findViewById(R.id.next_process_btn);
txtTotalAmount =(TextView) findViewById(R.id.total_price);
}
#Override
protected void onStart() {
super.onStart();
final DatabaseReference cartListRef = FirebaseDatabase.getInstance().getReference().child("Cart List");
FirebaseRecyclerOptions<Cart>options=
new FirebaseRecyclerOptions.Builder<Cart>()
.setQuery(cartListRef.child("User View").child(Prevalent.currentOnlineUser.getPhone())
.child("Products"), Cart.class).build();
FirebaseRecyclerAdapter<Cart, CartViewHolder> adapter
= new FirebaseRecyclerAdapter<Cart, CartViewHolder>(options) {
#Override
protected void onBindViewHolder(#NonNull CartViewHolder holder, int position, #NonNull Cart model) {
holder.txtProductName.setText(model.getPname());
holder.txtProductQuantity.setText("Quantity =" + model.getQuantity());
holder.txtProductPrice.setText("Price= " + model.getPrice() + "");
}
#NonNull
#Override
public CartViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.cart_items_layout,parent,false);
CartViewHolder holder = new CartViewHolder(view);
return holder;
}
};
recyclerView.setAdapter(adapter);
adapter.startListening();
}
}
Cart class
private String pid, pname, price , quantity ,discount;
public Cart() {
}
public Cart(String pid, String pname, String price, String quantity, String dicount) {
this.pid = pid;
this.pname = pname;
this.price = price;
this.quantity = quantity;
this.dicount = dicount;
}
public String getPid() {
return pid;
}
public void setPid(String pid) {
this.pid = pid;
}
public String getPname() {
return pname;
}
public void setPname(String pname) {
this.pname = pname;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public String getQuantity() {
return quantity;
}
public void setQuantity(String quantity) {
this.quantity = quantity;
}
public String getDicount() {
return dicount;
}
public void setDiscount(String discount) {
this.dicount = dicount;
}
}
Cardviewholder class
import android.view.View;
import android.widget.TextView;
import androidx.recyclerview.widget.RecyclerView;
import com.example.bartertrader.Interface.ItemClickListner;
import com.example.bartertrader.R;
public class CartViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView txtProductName, txtProductPrice, txtProductQuantity;
private ItemClickListner itemClickListner;
public CartViewHolder( View itemView) {
super(itemView);
txtProductName = itemView.findViewById(R.id.cart_product_name);
txtProductPrice = itemView.findViewById(R.id.cart_product_price);
txtProductQuantity = itemView.findViewById(R.id.cart_product_quantity);
}
#Override
public void onClick(View view) {
itemClickListner.onClick(view, getAdapterPosition(),false);
}
public void setItemClickListner(ItemClickListner itemClickListner) {
this.itemClickListner = itemClickListner;
}
}
I dont undestart why it show me the Name and the price and quantity are null
Your Firebase database is giving you Cart objects where the price and quantity is not set. You should ensure that you are setting this attributes where you are loading the records into Firebase.
I want to fetch all my phone contacts into a listview of my app. What i did here is i have an activity where i put a listview & i want display all my contacts there, so for that created a data model & an adapter, but every time i get this error,
I don't know what is the error,
FATAL EXCEPTION: main
Process: com.example.theroos.messageism, PID: 25858
com.google.firebase.database.DatabaseException: Can't convert object of type java.lang.String to type com.example.theroos.messageism.UserObject
My FindUserActivity is,
FindUserActivity.java
import android.database.Cursor;
import android.provider.ContactsContract;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.widget.LinearLayout;
import java.util.ArrayList;
public class FindUserActivity extends AppCompatActivity {
private RecyclerView mUserList;
private RecyclerView.Adapter mUserListAdapter;
private RecyclerView.LayoutManager mUserListLayoutManager;
ArrayList<UserObject>userList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_find_user);
userList = new ArrayList<>();
initializeRecyclerView();
getcontactlist();
}
private void getcontactlist(){
Cursor phones = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI,null,null,null,null,null);
while(phones.moveToNext()){
String name = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.DISPLAY_NAME));
String phone = phones.getString(phones.getColumnIndex(ContactsContract.CommonDataKinds.Phone.NUMBER));
UserObject mContacts = new UserObject(name,phone);
userList.add(mContacts);
mUserListAdapter.notifyDataSetChanged();
}
}private void initializeRecyclerView() {
mUserList = findViewById(R.id.contacts_listview);
mUserList.setNestedScrollingEnabled(false);
mUserList.setHasFixedSize(false);
mUserListLayoutManager = new LinearLayoutManager(getApplicationContext(), LinearLayout.VERTICAL,false);
mUserList.setLayoutManager(mUserListLayoutManager);
mUserListAdapter = new UserListAdapter(userList);
mUserList.setAdapter(mUserListAdapter);
}
}
My data model is,
UserObject.java
public class UserObject {
private String name;
private String phone;
public UserObject(String name, String phone) {
this.name = name;
this.phone = phone;
}
public String getName() { return name;}
public String getPhone() { return phone;}
}
UserListAdapter.java
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
public class UserListAdapter extends RecyclerView.Adapter<UserListAdapter.UserListViewHolder> {
ArrayList<UserObject> userList;
public UserListAdapter(ArrayList<UserObject> userList){
this.userList = userList;
}
#NonNull
#Override
public UserListViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View layoutView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.item_user,null,false);
RecyclerView.LayoutParams lp = new RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT);
layoutView.setLayoutParams(lp);
UserListViewHolder rcv = new UserListViewHolder(layoutView);
return rcv;
}
#Override
public void onBindViewHolder(#NonNull UserListViewHolder holder, int position) {
holder.mName.setText(userList.get(position).getName());
holder.mPhone.setText(userList.get(position).getPhone());
}
#Override
public int getItemCount() {
return userList.size();
}
public class UserListViewHolder extends RecyclerView.ViewHolder {
TextView mName, mPhone;
public UserListViewHolder(View View) {
super(View);
mName = View.findViewById(R.id.name);
mPhone = View.findViewById(R.id.phone);
}
}
}
I have tried several ways but i can't find any solution. Please help.