Show data from Firebase in a Recyclerview in a Fragment

Show data from Firebase in a Recyclerview in a Fragment | Java - java

How can I take data from Firebase into a recyclerview and show it inside a fragment?
I followed This video to create a recyclerview inside a fragment. But in it the data is static. (retrieved from the strings file)
I then tried to incorporate this video to retrieve data from Firebase.
But it doesn't work. Maybe I have to call the functions in a different override??
My Fragment Class (HomeFragemnt.java)
package com.example.foodapp.deliverer;
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.foodapp.R;
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;
public class HomeFragment extends Fragment {
private ArrayList<OrderItem> orderItemArrayList;
RecyclerView recyclerview;
DatabaseReference DB;
ItemRecyclerAdapter itemRecyclerAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.delivery_fragment_home, container, false);
return view;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerview = view.findViewById(R.id.delivery_orders_recyclerView);
DB = FirebaseDatabase.getInstance().getReference("Delivery");
recyclerview.setHasFixedSize(true);
recyclerview.setLayoutManager(new LinearLayoutManager(getContext()));
orderItemArrayList = new ArrayList<>();
itemRecyclerAdapter = new ItemRecyclerAdapter(getContext(), orderItemArrayList);
recyclerview.setAdapter(itemRecyclerAdapter);
DB.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot snapshot) {
for(DataSnapshot dataSnapshot: snapshot.getChildren()){
OrderItem item = dataSnapshot.child("Delivery").getValue(OrderItem.class);
orderItemArrayList.add(item);
}
}
#Override
public void onCancelled(#NonNull DatabaseError error) {
}
});
itemRecyclerAdapter.notifyDataSetChanged();
}
}
My Fragment Layout (delivery_fragment_home.xml)
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".deliverer.HomeFragment" >
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/delivery_orders_recyclerView"
android:layout_width="409dp"
android:layout_height="729dp"
android:background="#CDDC39"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:listitem="#layout/delivery_orderitem" />
</androidx.constraintlayout.widget.ConstraintLayout>
Item into Recyclerview class (OrderItem.java)
package com.example.foodapp.deliverer;
public class OrderItem {
private String orderID;
private String Address;
public OrderItem(String orderID, String Address) {
this.orderID = orderID;
this.Address = Address;
}
public String getOrderID() {
return orderID;
}
public String getAddress() {
return Address;
}
}
Item into recyclerview layout (delivery_orderItem.xml)
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content">
<TextView
android:id="#+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:layout_marginTop="15dp"
android:text="#string/lbl_orderId"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/textView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="15dp"
android:layout_marginTop="8dp"
android:layout_marginBottom="15dp"
android:text="#string/lbl_address"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView2" />
<TextView
android:id="#+id/lbl_orderId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="15dp"
android:text="TextView"
app:layout_constraintStart_toEndOf="#+id/textView2"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/lbl_address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginBottom="15dp"
android:text="TextView"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="#+id/lbl_orderId"
app:layout_constraintTop_toBottomOf="#+id/lbl_orderId" />
</androidx.constraintlayout.widget.ConstraintLayout>
Adapter class (ItemRecyclerAdapter.java)
package com.example.foodapp.deliverer;
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 com.example.foodapp.R;
import java.util.ArrayList;
public class ItemRecyclerAdapter extends RecyclerView.Adapter<ItemRecyclerAdapter.DriverItemViewHolder> {
Context context;
ArrayList<OrderItem> itemArrayList;
public ItemRecyclerAdapter(Context context, ArrayList<OrderItem> itemList) {
this.context = context;
this.itemArrayList = itemList;
}
#NonNull
#Override
public DriverItemViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(context).inflate(R.layout.delivery_orderitem, parent, false);
return new DriverItemViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull ItemRecyclerAdapter.DriverItemViewHolder holder, int position) {
OrderItem order = itemArrayList.get(position);
holder.orderID.setText(order.getOrderID());
holder.address.setText(order.getAddress());
}
#Override
public int getItemCount() {
return itemArrayList .size();
}
public static class DriverItemViewHolder extends RecyclerView.ViewHolder{
private TextView orderID;
private TextView address;
public DriverItemViewHolder(#NonNull View itemView) {
super(itemView);
this.orderID = itemView.findViewById(R.id.lbl_orderId);
this.address = itemView.findViewById(R.id.lbl_address);
}
}
}
What am I doing wrong?

Related

size of recycler view item changes when user scrolls down and up

I am working on a chat functionality to implement in my app. The purpose is that when a message comes from another user, the message item will align parent's start and when the user sends a message, it will align to the end. The send button on upper left corner simulates the other user sending a message. The problem is that when items recycles, some of them mathes the width of parent layout. I do not really understand why this happens and how to fix it. Thanks in advance...
package com.example.messageapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.app.Activity;
import android.content.Context;
import android.database.Observable;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
Button sendBtn;
Button otherSendBtn;
EditText editText;
RecyclerView recyclerView;
MessagesAdapter adapter;
List<ChatMessage> messageList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
messageList=new ArrayList<>();
sendBtn=findViewById(R.id.sendBtn);
otherSendBtn=findViewById(R.id.otherSendBtn);
editText=findViewById(R.id.editText);
recyclerView=findViewById(R.id.recyclerView);
adapter=new MessagesAdapter(this,messageList);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
for(int i=0; i<4; i++){
if(i%2==0){
messageList.add(new ChatMessage("from him","self"));
}else{
messageList.add(new ChatMessage("from me","other"));
}
adapter.notifyItemInserted(messageList.size()-1);
}
otherSendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
messageList.add(new ChatMessage("random","other"));
adapter.notifyItemInserted(messageList.size()-1);
}
});
sendBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String txt=editText.getText().toString();
messageList.add(new ChatMessage(txt, "self"));
adapter.notifyItemInserted(messageList.size()-1);
editText.setText("");
hideKeyboardFrom(MainActivity.this, view);
}
});
}
public static void hideKeyboardFrom(Context context, View view) {
InputMethodManager imm = (InputMethodManager) context.getSystemService(Activity.INPUT_METHOD_SERVICE);
imm.hideSoftInputFromWindow(view.getWindowToken(), 0);
}
}
model class for messages
package com.example.messageapp;
public class ChatMessage {
public String text;
public String user;
public ChatMessage(String text, String user) {
this.text = text;
this.user = user;
}
}
recycler view adapter
package com.example.messageapp;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.List;
public class MessagesAdapter extends RecyclerView.Adapter {
Context context;
List<ChatMessage> messages;
public void setMessages(List<ChatMessage> messages) {
this.messages = messages;
}
public MessagesAdapter(Context context, List<ChatMessage> messages) {
this.context = context;
this.messages = messages;
}
private static class MessageViewHolder extends RecyclerView.ViewHolder{
TextView textView;
RelativeLayout relativeLayout;
public MessageViewHolder(#NonNull View itemView) {
super(itemView);
textView=itemView.findViewById(R.id.messageTextView);
relativeLayout=itemView.findViewById(R.id.item_parent);
}
}
#NonNull
#Override
public RecyclerView.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v= LayoutInflater.from(context).inflate(R.layout.message_item,parent,false);
return new MessageViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull RecyclerView.ViewHolder holder, int position) {
ChatMessage message=messages.get(position);
((MessageViewHolder) holder).textView.setText(message.text);
RelativeLayout.LayoutParams params= (RelativeLayout.LayoutParams) ((MessageViewHolder) holder).relativeLayout.getLayoutParams();
if(message.user.equals("self")){
params.addRule(RelativeLayout.ALIGN_PARENT_END);
((MessageViewHolder) holder).relativeLayout.setBackgroundColor(context.getResources().getColor(R.color.teal_200));
}else{
params.addRule(RelativeLayout.ALIGN_PARENT_START);
((MessageViewHolder) holder).relativeLayout.setBackgroundColor(context.getResources().getColor(R.color.purple_200));
}
((MessageViewHolder) holder).relativeLayout.setLayoutParams(params);
}
#Override
public int getItemCount() {
return messages.size();
}
}
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_margin="10dp">
<RelativeLayout
android:id="#+id/item_parent"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#color/teal_700">
<TextView
android:padding="10dp"
android:id="#+id/messageTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</RelativeLayout>
</RelativeLayout>
<?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"
tools:context=".MainActivity">
<Button
android:id="#+id/otherSendBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="send"
android:layout_centerHorizontal="true"/>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/otherSendBtn"
tools:listitem="#layout/message_item"/>
<RelativeLayout
android:id="#+id/linear"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:orientation="horizontal">
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_toStartOf="#+id/sendBtn"
android:layout_marginEnd="5dp"/>
<Button
android:background="#drawable/ic_baseline_send_24"
android:id="#+id/sendBtn"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"/>
</RelativeLayout>
</RelativeLayout>

How to change fragment from the Recycler View OnClick Listener when RecyclerView item is clicked using Navigation Components

Basically I want to change fragment when an item is clicked in recyclerView List. But when I did it in OnClick method of RecyclerViewAdapterForClassList it is showing error
NavHostFragment.findNavController(SecondFragment.this).navigate(R.id.action_SecondFragment_to_studentListFragment);
MainActivity.java
import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.navigation.NavController;
import androidx.navigation.Navigation;
import androidx.navigation.ui.AppBarConfiguration;
import androidx.navigation.ui.NavigationUI;
import com.android.studentattendancerecorder.databinding.ActivityMainBinding;
import android.view.Menu;
import android.view.MenuItem;
public class MainActivity extends AppCompatActivity {
private AppBarConfiguration appBarConfiguration;
private ActivityMainBinding binding;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMainBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
setSupportActionBar(binding.toolbar);
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
appBarConfiguration = new AppBarConfiguration.Builder(navController.getGraph()).build();
NavigationUI.setupActionBarWithNavController(this, navController, appBarConfiguration);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
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.about) {
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
public boolean onSupportNavigateUp() {
NavController navController = Navigation.findNavController(this, R.id.nav_host_fragment_content_main);
return NavigationUI.navigateUp(navController, appBarConfiguration)
|| super.onSupportNavigateUp();
}
}
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout 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"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/Theme.StudentAttendanceRecorder.AppBarOverlay">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/Theme.StudentAttendanceRecorder.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<include layout="#layout/content_main" />
</androidx.coordinatorlayout.widget.CoordinatorLayout>
FirstFragemnt.java
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;
import androidx.recyclerview.widget.RecyclerView;
import com.android.studentattendancerecorder.Adapters.RecyclerViewAdapterForClassList;
import com.android.studentattendancerecorder.databinding.FragmentFirstBinding;
public class FirstFragment extends Fragment {
private FragmentFirstBinding binding;
#Override
public View onCreateView(
LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState
) {
binding = FragmentFirstBinding.inflate(inflater, container, false);
return binding.getRoot();
}
public void onViewCreated(#NonNull View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
binding.buttonFirst.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
NavHostFragment.findNavController(FirstFragment.this)
.navigate(R.id.action_FirstFragment_to_SecondFragment);
}
});
}
#Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
}
fragment_first.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".FirstFragment">
<TextView
android:id="#+id/textview_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/hello_first_fragment"
app:layout_constraintBottom_toTopOf="#id/button_first"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/button_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/next"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/textview_first" />
</androidx.constraintlayout.widget.ConstraintLayout>
SecondFragment.java
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import androidx.annotation.NonNull;
import androidx.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.android.studentattendancerecorder.Adapters.RecyclerViewAdapterForClassList;
import com.android.studentattendancerecorder.Model.ClassAndSubjectDetails;
import com.android.studentattendancerecorder.databinding.FragmentSecondBinding;
import java.util.ArrayList;
public class SecondFragment extends Fragment {
private RecyclerView recyclerViewClass;
private RecyclerViewAdapterForClassList recyclerViewAdapterForClassList;
private ArrayList<ClassAndSubjectDetails> classAndSubjectDetailsArrayList;
private ArrayAdapter<String> arrayAdapter;
private FragmentSecondBinding binding;
#Override
public View onCreateView(
LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState
) {
binding = FragmentSecondBinding.inflate(inflater, container, false);
return binding.getRoot();
}
public void onViewCreated(#NonNull View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
recyclerViewClass= view.findViewById(R.id.recyclerViewClass);
recyclerViewClass.setHasFixedSize(true);
recyclerViewClass.setLayoutManager(new LinearLayoutManager(getActivity()));
classAndSubjectDetailsArrayList=new ArrayList<ClassAndSubjectDetails>();
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA I","Operating System"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA II","Oops"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA II","Oops"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("M.Tech","System Design"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("B.tech.","Computer Network"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA","Teleport System"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA II","Operating System"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA II","Oops"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("M.Tech","System Design"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("B.tech.","Computer Network"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA","Teleport System"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA II","Operating System"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("M.Tech","System Design"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("B.tech.","Computer Network"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA","Teleport System"));
classAndSubjectDetailsArrayList.add(new ClassAndSubjectDetails("MCA II","Operating System"));
recyclerViewAdapterForClassList=new RecyclerViewAdapterForClassList(getContext(),classAndSubjectDetailsArrayList);
recyclerViewClass.setAdapter(recyclerViewAdapterForClassList);
/* binding.buttonSecond.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
NavHostFragment.findNavController(SecondFragment.this)
.navigate(R.id.action_SecondFragment_to_FirstFragment);
}
});*/
}
#Override
public void onDestroyView() {
super.onDestroyView();
binding = null;
}
}
fragment_second.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".SecondFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerViewClass"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="#+id/floatingActionButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginEnd="36dp"
android:layout_marginBottom="36dp"
android:clickable="true"
android:src="#android:drawable/ic_input_add"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
StudentListFragment.java
import android.os.Bundle;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class StudentListFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_student_list, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
}
RecyclerViewAdpaterForClassList.java
import android.content.Context;
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.fragment.app.Fragment;
import androidx.navigation.fragment.NavHostFragment;
import androidx.recyclerview.widget.RecyclerView;
import com.android.studentattendancerecorder.FirstFragment;
import com.android.studentattendancerecorder.Model.ClassAndSubjectDetails;
import com.android.studentattendancerecorder.R;
import com.android.studentattendancerecorder.SecondFragment;
import com.google.android.material.snackbar.Snackbar;
import java.util.List;
public class RecyclerViewAdapterForClassList extends RecyclerView.Adapter<RecyclerViewAdapterForClassList.ViewHolder> {
private Context context;
private List<ClassAndSubjectDetails> classAndSubjectDetailsList;
public RecyclerViewAdapterForClassList(Context context, List<ClassAndSubjectDetails> classAndSubjectDetailsList) {
this.context = context;
this.classAndSubjectDetailsList = classAndSubjectDetailsList;
}
//create card/item/holder
#NonNull
#Override
public RecyclerViewAdapterForClassList.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.classlistitem,parent,false);
return new ViewHolder(view);
}
//set details of each holder/card/item
#Override
public void onBindViewHolder(#NonNull RecyclerViewAdapterForClassList.ViewHolder holder, int position) {
ClassAndSubjectDetails classAndSubjectDetails=classAndSubjectDetailsList.get(position);
holder.class_name.setText(classAndSubjectDetails.getClass_name());
holder.subject_name.setText(classAndSubjectDetails.getSubject_name());
}
#Override
public int getItemCount() {
return classAndSubjectDetailsList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView class_name;
public TextView subject_name;
public ViewHolder(#NonNull View itemView) {
super(itemView);
itemView.setOnClickListener(this);
class_name=itemView.findViewById(R.id.className);
subject_name=itemView.findViewById(R.id.subjectName);
}
#Override
public void onClick(View v) {
}
}
}
fragment_student_list.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
tools:context=".StudentListFragment">
<!-- TODO: Update blank fragment layout -->
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:text="#string/hello_blank_fragment" />
</FrameLayout>
ClassAndSubjectDetails.java
import androidx.annotation.NonNull;
public class ClassAndSubjectDetails {
private String class_name;
private String subject_name;
static int id=0;
public ClassAndSubjectDetails(String aClass, String subject) {
class_name = aClass;
subject_name = subject;
}
public String getClass_name() {
return class_name;
}
public void setClass_name(String class_name) {
this.class_name = class_name;
}
public String getSubject_name() {
return subject_name;
}
public void setSubject_name(String subject_name) {
this.subject_name = subject_name;
}
public static int getId() {
return id;
}
public static void setId(int id) {
ClassAndSubjectDetails.id = id;
}
}
classListItem.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView 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="100dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/className"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="12dp"
android:text="MCA ( IIIrd Sem. )"
android:textAllCaps="true"
android:textColor="#000000"
android:textSize="34sp"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/subjectName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="12dp"
android:layout_marginTop="3dp"
android:text="Object Oriented Programming"
android:textStyle="bold"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/className" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
navGraph.xml
<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="#+id/nav_graph"
app:startDestination="#id/FirstFragment">
<fragment
android:id="#+id/FirstFragment"
android:name="com.android.studentattendancerecorder.FirstFragment"
android:label="#string/first_fragment_label"
tools:layout="#layout/fragment_first">
<action
android:id="#+id/action_FirstFragment_to_SecondFragment"
app:destination="#id/SecondFragment" />
</fragment>
<fragment
android:id="#+id/SecondFragment"
android:name="com.android.studentattendancerecorder.SecondFragment"
android:label="#string/second_fragment_label"
tools:layout="#layout/fragment_second">
<action
android:id="#+id/action_SecondFragment_to_FirstFragment"
app:destination="#id/FirstFragment" />
<action
android:id="#+id/action_SecondFragment_to_studentListFragment"
app:destination="#id/studentListFragment" />
</fragment>
<fragment
android:id="#+id/studentListFragment"
android:name="com.android.studentattendancerecorder.StudentListFragment"
android:label="fragment_student_list"
tools:layout="#layout/fragment_student_list" >
<action
android:id="#+id/action_studentListFragment_to_SecondFragment"
app:destination="#id/SecondFragment" />
</fragment>
</navigation>

Perhaps it solves your problem.
Add interface in your viewModel
public interface CallListener{
public void myChoice(int position);
}
Create realisation it in your Fragment,
and give your viewModel in constructor
public RecyclerViewAdapterForClassList(Context context,
List<ClassAndSubjectDetails> classAndSubjectDetailsList, CallListener listener) {
this.context = context;
this.classAndSubjectDetailsList = classAndSubjectDetailsList;
this.listener = listener;
}
then add listener to your holder
holder.itemView.setOnClickListener((view) ->{
if (listener!= null) listener.myChoice(holder.getAdapterPosition());
});
or you can just call that
AppCompatActivity activity = ((AppCompatActivity) holder.itemView.getContext());
Navigation.findNavController(activity,R.id.nav_host_fragment_content_main).navigate(R.id.myFragment);

E/Volley: [6074] BasicNetwork.performRequest: Unexpected response code 403 for

activity_main.xml
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".MainActivity">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rView"
android:layout_width="409dp"
android:layout_height="729dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
2.activity_frame.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView 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="500dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/imageView"
android:layout_width="411dp"
android:layout_height="360dp"
android:scaleType="centerCrop"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="#tools:sample/avatars"
android:contentDescription="#string/todo" />
<TextView
android:id="#+id/textView1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/textview1"
android:textSize="18sp"
android:textStyle="bold"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/imageView"
app:layout_constraintVertical_bias="0.173" />
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:text="#string/textview2"
android:maxLines="1"
android:ellipsize="end"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="#+id/textView1"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/textView1" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
HDNews.java
package com.example.android.hdnews;
public class HDNews {
private String title;
private String author;
private String image;
public HDNews(String title, String author, String image) {
this.title = title;
this.author = author;
this.image = image;
}
public String getTitle() {
return title;
}
public String getAuthor() {
return author;
}
public String getImage() {
return image;
}
}
MainActivity.java
package com.example.android.hdnews;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.widget.LinearLayout;
import com.android.volley.NetworkResponse;
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.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private ArrayList al;
private HDNewsAdapter hdNewsAdapter;
private RequestQueue requestQueue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView=findViewById(R.id.rView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
al=new ArrayList<HDNews>();
requestQueue= Volley.newRequestQueue(this);
extractingDataFromInternet();
}
//http://newsapi.org/v2/top-headlines?country=in&apiKey=94bf8bcc374b494485309e325e3656f9
public void extractingDataFromInternet(){
String url="http://newsapi.org/v2/top-headlines?country=in&category=business&apiKey=94bf8bcc374b494485309e325e3656f9";
JsonObjectRequest JsonObjReq=new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("articles");
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject ca = jsonArray.getJSONObject(i);
String authorNames = ca.optString("author");
String titleNames = ca.optString("title");
String imageUrls = ca.getString("urlToImage");
al.add(new HDNews(titleNames, authorNames, imageUrls));
}
hdNewsAdapter = new HDNewsAdapter(MainActivity.this, al);
recyclerView.setAdapter(hdNewsAdapter);
} catch ( JSONException e ) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue.add(JsonObjReq);
}
}
HDNewsAdapter
package com.example.android.hdnews;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
public class HDNewsAdapter extends RecyclerView.Adapter<HDNewsAdapter.ViewHolder>{
private Context context;
private ArrayList<HDNews> al;
public HDNewsAdapter(Context context, ArrayList<HDNews> al) {
this.context = context;
this.al = al;
}
#NonNull
#Override
public HDNewsAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View views= LayoutInflater.from(parent.getContext()).inflate(R.layout.activity_frame,parent,false);
return new ViewHolder(views);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
HDNews currentposition=al.get(position);
String imgurl=currentposition.getImage();
String athName=currentposition.getAuthor();
String ttleName=currentposition.getTitle();
holder.titleName01.setText(ttleName);
holder.authorName01.setText(athName);
Glide.with(context).load(imgurl).into(holder.imageurl01);
}
#Override
public int getItemCount() {
return al.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView authorName01;
public TextView titleName01;
public ImageView imageurl01;
public ViewHolder(#NonNull View itemView) {
super(itemView);
authorName01=itemView.findViewById(R.id.textView1);
titleName01=itemView.findViewById(R.id.textView2);
imageurl01=itemView.findViewById(R.id.imageView);
}
#Override
public void onClick(View view) {
}
}
}

Showing xml for correct view

When a user logs in to my app, they can either click the view students button or daily grading button. The view students will display a student's image and their name. The daily grading will display the student's image, name, and two checkboxes that says pass or fail. Now the issue I have is that the checkboxes for pass and fail are showing up in my activity_view_students.xml view when it should not be. It should only show when a user clicks daily grading. I will put images below to make it clearer
What it looks like in the activity_view_students.xml
What it should look like in activity_view_students.xml
I will paste all relevant code below.
ViewStudents.java
package com.example.studenttracker;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.GridLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
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.Query;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class ViewStudents extends AppCompatActivity {
RecyclerView recyclerView;
Button addStudent;
private DatabaseReference myRef;
public ArrayList<Students> students;
private RecyclerAdapter recyclerAdapter;
private Button orderStudents;
private EditText mEditTextAge;
private EditText mEditTextAssignment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_view_students);
recyclerView = findViewById(R.id.recyclerView);
addStudent = findViewById(R.id.addStudentButton);
mEditTextAge = findViewById(R.id.EditTextAge);
mEditTextAssignment = findViewById(R.id.EditTextAssignment);
orderStudents = findViewById(R.id.orderStudents);
addStudent.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(ViewStudents.this, AddStudent.class));
}
});
recyclerView.setLayoutManager(new GridLayoutManager(this, 2));
recyclerView.setHasFixedSize(true);
myRef = FirebaseDatabase.getInstance().getReference();
students = new ArrayList<>();
ClearAll();
GetDataFromFirebase();
}
private void GetDataFromFirebase() {
Query query = myRef.child("student");
query.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
ClearAll();
for(DataSnapshot snapshot: dataSnapshot.getChildren()) {
Students student = new Students();
if (snapshot.child("url").getValue() == null) {
student.setImageUrl(snapshot.child("imageUrl").getValue().toString());
}
else {
student.setImageUrl(snapshot.child("url").getValue().toString());
}
// student.setAge(mEditTextAge.getText().toString());
// student.setAssignment(mEditTextAssignment.getText().toString().trim());
student.setName(snapshot.child("name").getValue().toString());
students.add(student);
}
recyclerAdapter = new RecyclerAdapter(getApplicationContext(), students);
recyclerView.setAdapter(recyclerAdapter);
recyclerAdapter.notifyDataSetChanged();
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
}
});
}
private void ClearAll() {
if (students != null) {
students.clear();
if(recyclerAdapter != null) {
recyclerAdapter.notifyDataSetChanged();
}
}
students = new ArrayList<>();
}
public void orderStudents(View view) {
Collections.sort( students, new Comparator<Students>() {
#Override
public int compare( Students o1, Students o2 ) {
return o1.name.compareTo( o2.name );
}
});
recyclerAdapter.notifyDataSetChanged();
}
}
RecyclerAdapter.java
package com.example.studenttracker;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.ImageView;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
private OnItemClickListener mListener;
public interface OnItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
mListener = listener;
}
private static final String Tag = "RecyclerView";
private Context mContext;
private ArrayList<Students> studentsArrayList;
public RecyclerAdapter(Context mContext, ArrayList<Students> studentsArrayList) {
this.mContext = mContext;
this.studentsArrayList = studentsArrayList;
}
#NonNull
#Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.activity_student_item,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
//TextView
holder.textView.setText(studentsArrayList.get(position).getName());
Glide.with(mContext).load(studentsArrayList.get(position).getImageUrl()).into(holder.imageView);
// if (studentsArrayList.get(position).get) { //check if you need the buttons or not
// holder..setVisibility(View.VISIBLE);
// holder.checkBox2.setVisibility(View.VISIBLE);
// } else {
// holder.checkBox.setVisibility(View.GONE);
// holder.checkBox2.setVisibility(View.GONE);
// }
}
#Override
public int getItemCount() {
return studentsArrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView textView;
public ViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.imageView);
textView = itemView.findViewById(R.id.textView);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mListener != null) {
int position = getAdapterPosition();
}
}
});
}
}
}
activity_view_students.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".ViewStudents">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="409dp"
android:layout_height="729dp"
android:layout_marginEnd="1dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" >
</androidx.recyclerview.widget.RecyclerView>
<Button
android:id="#+id/addStudentButton"
android:layout_width="wrap_content"
android:layout_height="50dp"
android:text="Add Students"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="#+id/orderStudents"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="orderStudents"
android:text="Order Students"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
daily_grading.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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"
tools:context=".DailyGrading">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerView"
android:layout_width="409dp"
android:layout_height="729dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
activity_student_item.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content"
tools:context=".DailyGrading">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:foreground="?android:attr/selectableItemBackground"
app:cardElevation="2dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</androidx.cardview.widget.CardView>
<RelativeLayout
android:id="#+id/relativeLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="52dp">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="50dp"
android:paddingTop="20dp"
android:scaleType="centerCrop" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/imageView"
android:layout_margin="10dp"
android:textSize="16sp" />
<CheckBox
android:id="#+id/passc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:text="PASS" />
<CheckBox
android:id="#+id/failc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:layout_toRightOf="#+id/passc"
android:text="FAIL" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
GradingRecyclerAdapter
package com.example.studenttracker;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.view.ViewGroup;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import java.util.ArrayList;
public class GradingRecyclerAdapter extends RecyclerView.Adapter<GradingRecyclerAdapter.ViewHolder> {
private OnItemClickListener mListener;
public interface OnItemClickListener {
void onItemClick(int position);
}
public void setOnItemClickListener(OnItemClickListener listener) {
mListener = listener;
}
private static final String Tag = "RecyclerView";
private Context mContext;
private ArrayList<Students> studentsArrayList;
public GradingRecyclerAdapter(Context mContext, ArrayList<Students> studentsArrayList) {
this.mContext = mContext;
this.studentsArrayList = studentsArrayList;
}
#NonNull
#Override
public GradingRecyclerAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.activity_grading_student_item,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
//TextView
holder.textView.setText(studentsArrayList.get(position).getName());
Glide.with(mContext).load(studentsArrayList.get(position).getImageUrl()).into(holder.imageView);
}
#Override
public int getItemCount() {
return studentsArrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView imageView;
TextView textView;
Button passButton;
Button failButton;
public ViewHolder(#NonNull View itemView) {
super(itemView);
imageView = itemView.findViewById(R.id.imageView);
textView = itemView.findViewById(R.id.textView);
passButton = itemView.findViewById(R.id.PASS);
failButton = itemView.findViewById(R.id.FAIL);
// passButton.setVisibility(View.GONE);
// failButton.setVisibility(View.GONE);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (mListener != null) {
int position = getAdapterPosition();
}
}
});
}
}
}
activity_grading_student_item
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout 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="wrap_content"
tools:context=".DailyGrading">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="50dp"
android:foreground="?android:attr/selectableItemBackground"
app:cardElevation="2dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
</androidx.cardview.widget.CardView>
<RelativeLayout
android:id="#+id/relativeLayout2"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
tools:layout_editor_absoluteX="0dp"
tools:layout_editor_absoluteY="52dp">
<ImageView
android:id="#+id/imageView"
android:layout_width="match_parent"
android:layout_height="200dp"
android:layout_marginTop="50dp"
android:paddingTop="20dp"
android:scaleType="centerCrop" />
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/imageView"
android:layout_margin="10dp"
android:textSize="16sp" />
<CheckBox
android:id="#+id/PASS"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:text="PASS" />
<CheckBox
android:id="#+id/FAIL"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#id/textView"
android:layout_toRightOf="#+id/PASS"
android:text="FAIL" />
</RelativeLayout>
</androidx.constraintlayout.widget.ConstraintLayout>

You can simply use different adapters
create another activity_student_item.xml let's say activity_view_student_item.xml and remove the checkboxes from that one
create another adapter for that recyclerView but change
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.activity_student_item,parent,false);
in the new adapter to
View view = LayoutInflater.from(parent.getContext())
.inflate(R.layout.activity_view_student_item,parent,false);
and in the ViewStudents activity set the recycler's Adapter to that new adapter

null object reference on set adapter

I know that there are a lot of question like this, but i can't find one that can help me. Please pay no attention at strings that are hard coded or other things like that, i will fix. I don't see anything wrong in adapter class or in the fragments. I use Disco class for fill a place list, the Place class contains all the methods that after i use in the adapter.Can anyone help me please? Thank you.
Class MainActivity
package com.techmind.tourguideapp;
import android.support.design.widget.TabLayout;
import android.support.v4.app.FragmentManager;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager manager = getSupportFragmentManager();
ViewPager pager = findViewById(R.id.tourPager);
pager.setAdapter(new FragmentAdapter(manager));
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(pager);
}
}
class Disco
package com.techmind.tourguideapp;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Nahuel on 31.05.2018.
*/
public class Disco {
public static ArrayList<Places> initDiscoList(ArrayList<Places> places) {
places.add(new Places().
setAddress("via a").
setImage(1).
setName("casino").
setPhone("333").
setPrice("20€").
setHour("10:30"));
return places;
}
}
Class DiscoFragment
package com.techmind.tourguideapp;
import android.support.v4.app.Fragment;
import android.location.Location;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Nahuel on 31.05.2018.
*/
public class DiscoFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
ArrayList<Places> list = new ArrayList<>();
list = Disco.initDiscoList(list);
PlacesAdapter adapter = new PlacesAdapter(getActivity(), list);
View view = inflater.inflate(R.layout.row_item, container, false);
ListView listView = (ListView) view.findViewById(R.id.list_items);
listView.setAdapter(adapter);
return view;
}
}
Class FragmentAdapter
package com.techmind.tourguideapp;
import android.content.Context;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
/**
* Created by Nahuel on 31.05.2018.
*/
public class FragmentAdapter extends FragmentPagerAdapter {
public FragmentAdapter (FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return new DiscoFragment();
}
#Override
public int getCount() {
return 3;
}
public CharSequence getPageTitle(int position) {
return "Gradara";
}
}
Class Places
package com.techmind.tourguideapp;
/**
* Created by Nahuel on 31.05.2018.
*/
public class Places {
private String name;
private String price;
private String phone;
private String Address;
private String hour;
private int image;
private final int NO_IMAGE = -1;
public Places () {
}
public String getHour() {
return hour;
}
public String getName() {
return name;
}
public String getPrice() {
return price;
}
public String getPhone() {
return phone;
}
public String getAddress() {
return Address;
}
public int getImage() {
return image;
}
public Places setName(String name) {
this.name = name;
return this;
}
public Places setHour(String hour) {
this.hour = hour;
return this;
}
public Places setPrice(String price) {
this.price = price;
return this;
}
public Places setPhone(String phone) {
this.phone = phone;
return this;
}
public Places setAddress(String address) {
Address = address;
return this;
}
public Places setImage(int image) {
this.image = image;
return this;
}
}
Class PlaceAdapter
package com.techmind.tourguideapp;
import android.content.Context;
import android.location.Location;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.List;
public class PlacesAdapter extends ArrayAdapter<Places> {
public PlacesAdapter(Context context, List<Places> places) {
super(context,-1, places);
}
public View getView (int position, ViewGroup parent, View convertView) {
View listView = convertView;
Places place = getItem(position);
if(listView == null) {
listView = LayoutInflater.from(getContext()).inflate(
R.layout.row_item, parent, false);
}
TextView location = listView.findViewById(R.id.locationName);
location.setText("casino");
TextView hour = listView.findViewById(R.id.txthour);
hour.setText("aaa");
TextView address = listView.findViewById(R.id.address);
address.setText("aaaaa");
TextView price = listView.findViewById(R.id.txtmoney);
price.setText("aaaaa");
TextView phone = listView.findViewById(R.id.phone);
phone.setText("aaaaa");
ImageView img = listView.findViewById(R.id.imgRow);
img.setImageResource(R.drawable.ic_launcher_background);
return listView;
}
}
Activity_Main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
tools:context="com.techmind.tourguideapp.MainActivity">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMaxWidth="0dp"
/>
<android.support.v4.view.ViewPager
android:id="#+id/tourPager"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
List_item.xml
</LinearLayout>
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ListView
android:id="#+id/list_items"
android:layout_width="wrap_content"
android:layout_height="wrap_content">
</ListView>
</LinearLayout>
Row_item.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<ImageView
android:id="#+id/imgRow"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:src="#drawable/gradara" />
<TextView
android:id="#+id/locationName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="24sp"
android:textStyle="bold"
android:text=""/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:layout_weight="0.5">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp">
<ImageView
android:id="#+id/positionIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="#mipmap/position"
android:layout_alignParentStart="true"/>
<TextView
android:id="#+id/txtPosition"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="#+id/positionIcon"
android:layout_marginTop="5dp"
android:text="" />
<TextView
android:id="#+id/address"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/positionIcon"
android:layout_toRightOf="#id/positionIcon"
android:text="" />
</RelativeLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp">
<ImageView
android:id="#+id/moneyIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="#mipmap/money"
android:layout_alignParentStart="true"/>
<TextView
android:id="#+id/txtmoney"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="#+id/moneyIcon"
android:layout_marginTop="15dp"
android:text="10€ - 20€" />
</LinearLayout>
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="5dp">
<ImageView
android:id="#+id/hourIcon"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:src="#mipmap/hour"
android:layout_alignParentStart="true"/>
<TextView
android:id="#+id/txthour"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toEndOf="#+id/hourIcon"
android:layout_marginTop="15dp"
android:text="09:30 - 23:00" />
</RelativeLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="10dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Phone:"
android:layout_marginEnd="5dp"
android:textStyle="bold"/>
<TextView
android:id="#+id/phone"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="3334323560"
/>
</LinearLayout>
</LinearLayout>
</LinearLayout>

You said you got a null pointer on set adapter. Are you talking about
this line in file DiscoFragment?
listView.setAdapter(adapter)
if listView is null then the findViewByID didn't find a view. Or maybe something inside adapter is null. It is hard to tell from what you said.

i found the error in
ArrayList<Places> list = new ArrayList<>();
list = Disco.initDiscoList(list);
PlacesAdapter adapter = new PlacesAdapter(getActivity(), list);
View view = inflater.inflate(R.layout.row_item, container, false);
ListView listView = (ListView) view.findViewById(R.id.list_items);
listView.setAdapter(adapter);
return view;
}
When i use the inflate method the first parameter was wrong, i used the layout of the row instead of the listView layout.
Thank you for your answers, next times i will post logs and less useless code :)

We Keep Coding

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Show data from Firebase in a Recyclerview in a Fragment | Java - java

Related

size of recycler view item changes when user scrolls down and up

How to change fragment from the Recycler View OnClick Listener when RecyclerView item is clicked using Navigation Components

E/Volley: [6074] BasicNetwork.performRequest: Unexpected response code 403 for

Showing xml for correct view

null object reference on set adapter

Categories

Resources