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How to pass web service data into the RecylerView in Android?

I am taking data from "https://jsonplaceholder.typicode.com/todos" with using Retrofit, and I want to create RecyclerView with these data but my app is crashing.
What is the problem exactly? I also debuged app, I am taking all data from web but cannot put them into the recyclerview..
This is my adapter class
public class RecylerViewAdapter extends RecyclerView.Adapter<RecylerViewAdapter.MyViewHolder> {
List<Bilgiler> bilgilerList;
public RecylerViewAdapter(List<Bilgiler> bilgilerList) {
this.bilgilerList = bilgilerList;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.list,parent,false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, int position) {
holder.userid.setText(bilgilerList.get(position).getUserId());
holder.id.setText(bilgilerList.get(position).getId());
holder.title.setText(bilgilerList.get(position).getTitle());
holder.checkBox.setChecked(bilgilerList.get(position).getCompleted());
}
#Override
public int getItemCount() {
return bilgilerList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView userid,id,title;
CheckBox checkBox;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
userid = itemView.findViewById(R.id.userid);
id = itemView.findViewById(R.id.id);
title = itemView.findViewById(R.id.titlee);
checkBox= itemView.findViewById(R.id.checkBox);
}
}
}
Finally, this is my Main class
public class MainActivity extends AppCompatActivity {
private List<Bilgiler> bilgilerList;
private RecyclerView recyclerView;
private RecylerViewAdapter recylerViewAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.recyler);
take();
}
public void take() {
Call<List<Bilgiler>> bilgiList = ManagerAll.getInstance().getirBilgileri();
bilgiList.enqueue(new Callback<List<Bilgiler>>() {
#Override
public void onResponse(Call<List<Bilgiler>> call, Response<List<Bilgiler>> response) {
if (response.isSuccessful()) {
bilgilerList=response.body();
recylerViewAdapter= new RecylerViewAdapter(bilgilerList);
recyclerView.setAdapter(recylerViewAdapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
Log.i("xxx",response.body().toString());
}
}
#Override
public void onFailure(Call<List<Bilgiler>> call, Throwable t) {
}
});
}
}
This is XML of page.
<?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="300dp"
android:background="#color/purple_200"
>
<TextView
android:id="#+id/userid"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="177dp"
android:layout_marginTop="39dp"
android:layout_marginEnd="177dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="178dp"
android:layout_marginTop="31dp"
android:layout_marginEnd="176dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/userid" />
<TextView
android:id="#+id/titlee"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="183dp"
android:layout_marginTop="31dp"
android:layout_marginEnd="170dp"
android:text="TextView"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/id" />
<CheckBox
android:id="#+id/checkBox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="155dp"
android:layout_marginTop="21dp"
android:layout_marginEnd="162dp"
android:text="CheckBox"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/titlee" />
</androidx.constraintlayout.widget.ConstraintLayout>

Try calling the notifyDataSetChanged method on the adapter after getting the new data
bilgiList.enqueue(new Callback<List<Bilgiler>>() {
#Override
public void onResponse(Call<List<Bilgiler>> call, Response<List<Bilgiler>> response) {
if (response.isSuccessful()) {
bilgilerList=response.body();
recylerViewAdapter = new RecylerViewAdapter(bilgilerList);
recyclerView.setAdapter(recylerViewAdapter);
recylerViewAdapter.notifyDataSetChanged();
recyclerView.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
Log.i("xxx",response.body().toString());
}
}
#Override
public void onFailure(Call<List<Bilgiler>> call, Throwable t) {
}
});

cannot able to show image and detail on RecyclerView using firebase

I tried to retrive images from firebase with correct url link. The RecyclerView keep shown "first" info of Food which is cookie-milk-cup:
This is my firebase data structure:
all_uploaded_image //directory
|-cookie milk cup
|-description: "yes!" //shown successful
|-image_uri: "content://com.android.providers.media.documents..." //no necessary in this case
|-name: "cookie milk cup" //shown successful
|-price: "1.20" //not shown
|-uploader_uid: "GSsY4tEo5ZZpS8kkJEpWGLCbFmC3" //no necessary in this case
fish n chips //recursive only on cookie milk cup, so nothing appear in here
|-description: "delicious fc"
|-image_uri: "content://com.android.providers.media.documents..."
|-name: "fish n chips"
|-price: "1.20"
|-uploader_uid: "GSsY4tEo5ZZpS8kkJEpWGLCbFmC3"
I am using android with java, want to get the info from firebase using fragment.
This is the AllFOodFragment.java
public class AllFoodFragment extends Fragment {
private View contactsView;
private ArrayList<Food> entries;
private DatabaseReference ref;
private FirebaseDatabase dbr;
private FoodAdapter adapter;
private RecyclerView recycler_view;
public AllFoodFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View contactsView = inflater.inflate(R.layout.home_main, container, false); //v
recycler_view = (RecyclerView) contactsView.findViewById(R.id.recycler_view);
recycler_view.setHasFixedSize(true);
recycler_view.setItemAnimator(new DefaultItemAnimator());
final FragmentActivity ga = getActivity(); //2a
LinearLayoutManager lm = new LinearLayoutManager(ga); //2
recycler_view.setLayoutManager(lm);
entries = new ArrayList<Food>();
ref = FirebaseDatabase.getInstance().getReference().child("all_uploaded_image");
ref.addChildEventListener(new ChildEventListener(){
#Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
for(DataSnapshot ds: dataSnapshot.getChildren()) {
//Log.e("Count " ,"" + dataSnapshot.getChildrenCount());
Food data = dataSnapshot.getValue(Food.class);
//data.setPrice(dataSnapshot.child("price").getValue().toString());
//data.setImageUrl(dataSnapshot.child("image_uri").getValue().toString());
entries.add(data);
//Log.e("Get All Description", data.get_price());
}
adapter = new FoodAdapter(getActivity(), entries);
adapter.notifyDataSetChanged();
adapter.setListFood(entries);
//3; No adapter attached in here, but program runs
recycler_view.setAdapter(adapter);
}
#Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
#Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
#Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
#Override
public void onCancelled(DatabaseError databaseError) {
Toast.makeText(getContext(), databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
return contactsView;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
public void onViewCreated(View view, #Nullable Bundle savedUbstabceState){
super.onViewCreated(view, savedUbstabceState);
this.contactsView = view;
}
}
And, this is FoodAdapter.java
public class FoodAdapter extends RecyclerView.Adapter<FoodAdapter.FoodViewHolder> {
private Context m_context;
private ArrayList<Food> m_listFood = new ArrayList<Food>();
public FoodAdapter(Context context, ArrayList<Food> food_list) {//m_context, food_list
this.m_context = context;
this.m_listFood = food_list;
}
#NonNull
#Override
public FoodViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_fragment_all_food, parent, false);
return new FoodViewHolder(v);
}
public class FoodViewHolder extends RecyclerView.ViewHolder{
public ImageView FoodIcon;
public TextView FoodName;
public TextView FoodDescription;
public TextView FoodPrice;
public Button Fooddetail;
public FoodViewHolder (View itemView){
super(itemView);
FoodIcon = (ImageView)itemView.findViewById(R.id.thumbnail); //icon
FoodName = itemView.findViewById(R.id.foodname);
FoodDescription = itemView.findViewById(R.id.fooddescription);
FoodPrice = itemView.findViewById(R.id.foodprice);
Fooddetail = itemView.findViewById(R.id.fooddetail);
}
public void onClick(View view) {
}
}
#Override
public void onBindViewHolder(#NonNull FoodViewHolder holder, int position) {
Food f = m_listFood.get(position);
holder.FoodName.setText(f.get_name());
holder.FoodDescription.setText(f.get_description());
holder.FoodPrice.setText(f.get_price());
holder.FoodPrice.setText(f.get_url());
//Picasso.get().load(m_listFood.get(position).get_url()).fit().into(holder.FoodIcon);
Glide.with(m_context).load(f.get_url()).into(holder.FoodIcon); //getListFood().get(position).get_icon()
}
#Override
public int getItemCount() {
return m_listFood.size();
}
public Context get_context() {
return m_context;
}
public void setListFood(ArrayList<Food> m_listFood){
this.m_listFood = m_listFood;
}
}
this is item_fragment_all_food.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent" android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto"
app:cardCornerRadius="4dp"
android:layout_marginTop="4dp"
android:layout_marginBottom="4dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="8dp">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
app:layout_behavior="#string/appbar_scrolling_view_behavior">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView //icon not shown, white
android:id="#+id/thumbnail"
android:layout_width="150dp"
android:layout_height="150dp"
android:layout_marginStart="8dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#android:drawable/star_big_on" />
<TextView
android:id="#+id/foodname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentStart="true"
android:layout_marginStart="191dp"
android:layout_marginTop="16dp"
android:text="Name"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/thumbnail"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/fooddescription"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBottom="#+id/foodname"
android:layout_marginEnd="86dp"
android:layout_marginBottom="-91dp"
android:text="Description"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/thumbnail"
app:layout_constraintTop_toBottomOf="#+id/foodname" />
<TextView
android:id="#+id/foodprice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentEnd="true"
android:layout_marginTop="85dp"
android:layout_marginEnd="95dp"
android:text="Price"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.487"
app:layout_constraintStart_toEndOf="#+id/thumbnail"
app:layout_constraintTop_toBottomOf="#+id/fooddescription"
app:layout_constraintVertical_bias="0.0" />
<Button
android:id="#+id/fooddetail"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentEnd="true"
android:layout_marginEnd="79dp"
android:layout_marginBottom="16dp"
android:background="#color/colorPrimary"
android:text="Detail"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.496"
app:layout_constraintStart_toEndOf="#+id/thumbnail"
app:layout_constraintTop_toBottomOf="#+id/foodprice"
app:layout_constraintVertical_bias="0.0" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
</LinearLayout>
And, this is activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity">
<com.google.android.material.appbar.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/AppTheme.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/AppTheme.PopupOverlay" />
</com.google.android.material.appbar.AppBarLayout>
<LinearLayout
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<EditText
android:autofillHints="email"
android:layout_margin="15dp"
android:inputType="textEmailAddress"
android:hint="Enter Email"
android:id="#+id/et_email"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<EditText
android:layout_margin="15dp"
android:inputType="textPassword"
android:hint="Enter Password"
android:id="#+id/et_password"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:layout_margin="15dp"
android:hint="Register"
android:id="#+id/btn_register"
android:layout_width="match_parent"
android:onClick="click_to_register_new_user"
android:layout_height="wrap_content" />
<Button
android:layout_margin="15dp"
android:hint="Login"
android:id="#+id/btn_login"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</LinearLayout>
<TextView
android:id="#+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="137dp"
android:text="#string/reset_string" />
</RelativeLayout>
Lastly, my Food Model
public class Food {
public String name;
public String description;
public String price;
public String img_url;
public String icon;
public Food() {
//empty
}
public Food(String name, String description, String price, String imageUrl) {
if (name.trim().equals("")) {
name = "No Name";
}
this.name = name;
this.description = description;
this.price = price;
this.img_url = imageUrl;
}
public String get_name() {
return name;
}
public String get_description() {
return description;
}
public String get_price() {
return price;
}
public String get_icon() {
return icon;
}
public String get_url() {
return img_url;
}
public void setPrice(String price) {
this.price = price;
}
public void setImageUrl(String imageUrl) {
img_url = imageUrl;
}
public void set_icon(String icon) {
this.icon = icon;
}
}
The error I get is E/RecyclerView: No adapter attached; skipping layout
and No setter/field for image_uri found on class com.example.hungrystomach.Model.Food [but really I do not want image_uri shown in my recyclerview so I skip the TextView]
The recyclerView does not have any Image shown even I've FoodIcon with thumbnail in FOodAdaper.java. I've tried for three weeks already still no hope. I suppose to get all the info I need. I know it is little bit long but any suggestion and answer would appreciate.

Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference in my Adapter class [duplicate]

This question already has answers here:
What is a NullPointerException, and how do I fix it?
(12 answers)
Closed 3 years ago.
I'm having these error on my coding
Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference onBindViewHolder(BrandAdapter.java:67) and
BrandAdapter.onBindViewHolder(BrandAdapter.java:34).
I'm not really sure what went wrong as I follow the tutorial very closely. And my database is not empty.
It contains child.
this is my adapter class
public class BrandAdapter extends RecyclerView.Adapter<BrandAdapter.MyViewHolder> {
private Context context;
List<String> key;
ArrayList<Brand> brandList;
public BrandAdapter(ArrayList<Brand> brandList) {
this.brandList = brandList;
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.brand_list, viewGroup, false);
context = viewGroup.getContext();
return new BrandAdapter.MyViewHolder(view);
}
public BrandAdapter(Context c) {
this.context = c;
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder myViewHolder, final int i) {
myViewHolder.brand_name.setText(brandList.get(i).getBrand_name());
Picasso.with(context).load(brandList.get(i).getBrand_image()).into(myViewHolder.image);
// Picasso.with(mcontext).load(brand.getBrand_image()).into(myViewHolder.image);
myViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String bName = brandList.get(i).getBrand_name();
String pic = brandList.get(i).getBrand_image();
Log.i("loz", bName);
Intent intent = new Intent(context, updateBrand.class);
intent.putExtra("brand_name", bName);
intent.putExtra("imgurl", pic);
context.startActivity(intent);
}
});
#Override
public int getItemCount() {
return brandList.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
TextView brand_name;
CardView brand_cv;
ImageView image, btnDelete;
LinearLayout frame_layout;
public MyViewHolder(View itemView) {
super(itemView);
brand_name = itemView.findViewById(R.id.name);
image = itemView.findViewById(R.id.image);
brand_cv = itemView.findViewById(R.id.brand_cv);
btnDelete = itemView.findViewById(R.id.delete);
frame_layout = itemView.findViewById(R.id.frame_layout);
}
}
}
my Brand Activity class
public class BrandActivity extends AppCompatActivity {
DatabaseReference databaseReference;
ArrayList<Brand> brandList;
RecyclerView recyclerView;
SearchView searchView;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_brand);
databaseReference = FirebaseDatabase.getInstance().getReference("Brand").child("");
recyclerView = findViewById(R.id.rv);
searchView = findViewById(R.id.searchView);
}
#Override
protected void onStart() {
super.onStart();
if (databaseReference != null) {
databaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
if (dataSnapshot.exists()) {
brandList = new ArrayList<>();
for (DataSnapshot ds : dataSnapshot.getChildren()) {
brandList.add(ds.getValue(Brand.class));
}
}
BrandAdapter brandAdapter = new BrandAdapter(brandList);
recyclerView.setAdapter(brandAdapter);
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
Toast.makeText(BrandActivity.this, databaseError.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
}
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="20dp"
app:cardElevation="5dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:background="#color/lightgray">
<TextView
android:id="#+id/brand_name"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="sample"
android:textStyle="bold"
android:textColor="#color/white"
android:textAlignment="center"
android:background="#color/black"
android:textSize="20sp"
android:textAppearance="#style/TextAppearance.AppCompat.Headline" />
<ImageView
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="180dp"
android:layout_marginTop="10dp"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:background="#FCFAFA"
android:scaleType="centerCrop"
android:adjustViewBounds="true"
/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="10dp"
android:orientation="horizontal">
<ImageView
android:id="#+id/delete"
android:layout_width="60dp"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_marginLeft="10dp"
android:layout_marginTop="5dp"
android:padding="8dp"
android:visibility="visible"
app:srcCompat="#drawable/trash" />
</LinearLayout>
</LinearLayout>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#000" />
</androidx.cardview.widget.CardView>
Brand model
public class Brand {
public String brand_id;
public String brand_name;
public String brand_image;
public Brand(){}
public Brand(String brand_id, String brand_name, String brand_image) {
this.brand_id = brand_id;
this.brand_name = brand_name;
this.brand_image = brand_image;
}
public String getBrand_id() {
return brand_id;
}
public void setBrand_id(String brand_id) {
this.brand_id = brand_id;
}
public String getBrand_name() {
return brand_name;
}
public void setBrand_name(String brand_name) {
this.brand_name = brand_name;
}
public String getBrand_image() {
return brand_image;
}
public void setBrand_image(String brand_image) {
this.brand_image = brand_image;
}
}

In your MyViewHolder you are trying to find view that doesn't exist in your layout. So, try to change brand_name = itemView.findViewById(R.id.name) to brand_name = itemView.findViewById(R.id.brand_name). The same problem is also related to the other views in layout except image and delete: you don't have views with brand_cv and frame_layout ids.

Multiple TextView in RecycleView. how to do that?

Hello I just started the Android and I do not understand how to put more TextView in a RecyclerView
I have already seen this solution but I do not understand: How to create RecyclerView with multiple view type?
I tried to make a table with multiple dimensions but it did not work.
Adapter:
public class DeviceRecyclerView extends RecyclerView.Adapter<DeviceRecyclerView.ViewHolder> {
private String[]data;
public DeviceRecyclerView(String[]data){
this.data = data;
}
#Override
public DeviceRecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.device_list_row, parent , false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
String name = data[position];
String rssi = data[position];
String uuid = data[position];
holder.DeviceNameTextView.setText(name);
holder.DeviceUUIDTextViewValue.setText(rssi);
holder.DeviceRSSIVTextViewValue.setText(uuid);
}
#Override
public int getItemCount() {
return data.length;
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView DeviceNameTextView;
TextView DeviceUUIDTextViewValue;
TextView DeviceRSSIVTextViewValue;
public ViewHolder (View itemView){
super(itemView);
DeviceNameTextView = itemView.findViewById(R.id.DeviceNameTextView);
DeviceUUIDTextViewValue = itemView.findViewById(R.id.DeviceUUIDTextViewValue);
DeviceRSSIVTextViewValue = itemView.findViewById(R.id.DeviceRSSIVTextViewValue);
}
}
MainActivity:
RecyclerView deviceList = (RecyclerView)findViewById(R.id.recycler_view_NoPaired);
deviceList.setLayoutManager(new LinearLayoutManager(this));
String[]names = {"Samsung64656"};
String[]rssi = {"ezez"};
String[]uuid = {"08:90:e5:90"};
deviceList.setAdapter(new DeviceRecyclerView(names));
My XML.
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.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/frameLayout"
android:layout_width="match_parent"
android:layout_height="180dp"
android:gravity="center_vertical"
tools:layout_editor_absoluteX="30dp"
tools:layout_editor_absoluteY="81dp">
<View
android:id="#+id/ColoredRect"
android:layout_width="10dp"
android:layout_height="160dp"
android:layout_marginBottom="16dp"
android:layout_marginTop="16dp"
android:background="#E27F26"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/DeviceNameTextView"
android:layout_width="133dp"
android:layout_height="24dp"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:text="#string/device_name_label"
android:textColor="#color/TextColor"
android:textSize="18sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/DeviceUUIDTv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="8dp"
android:text="#string/deviceUUIDTextView"
android:textColor="#color/TextColor"
android:textSize="12sp"
app:layout_constraintBottom_toTopOf="#+id/DeviceUUIDTextViewValue"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DeviceNameTextView" />
<TextView
android:id="#+id/DeviceUUIDTextViewValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="14sp"
android:text=""
android:textColor="#color/TextColor"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DeviceUUIDTv" />
<TextView
android:id="#+id/rssiLabelTextView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="16dp"
android:text="#string/deviceRSSITextView"
android:textColor="#color/TextColor"
android:textSize="12sp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/DeviceUUIDTextViewValue" />
<TextView
android:id="#+id/DeviceRSSIVTextViewValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginStart="20dp"
android:layout_marginTop="14sp"
android:text=""
android:textColor="#color/TextColor"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#+id/rssiLabelTextView" />
</android.support.constraint.ConstraintLayout>
Please explain me clearly how to do it. I am French sorry for spelling errors.

You just need to add some textView in you'r XML row (named device_list_row.xml), and init their in your adapter, like you have already did with 3 textview.
But's more easy with Object than use array of string, for data. for example in you'r case , make Device class object
Device.java
public class Device {
String name;
String rssi;
String uuid;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRssi() {
return rssi;
}
public void setRssi(String rssi) {
this.rssi = rssi;
}
public String getUuid() {
return uuid;
}
public void setUuid(String uuid) {
this.uuid = uuid;
}
}
And adapter code ->
public class DeviceRecyclerView extends RecyclerView.Adapter<DeviceRecyclerView.ViewHolder> {
private ArrayList<Device> deviceList;
public DeviceRecyclerView(Arraylist<Device> deviceList){
this.deviceList= deviceList;
}
#Override
public DeviceRecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View view = inflater.inflate(R.layout.device_list_row, parent , false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
Device device = deviceList.get(position);
holder.deviceNameTextView.setText(device.getName());
holder.deviceUUIDTextViewValue.setText(device.getUuid());
holder.deviceRSSIVTextViewValue.setText(device.getRssi());
}
#Override
public int getItemCount() {
return deviceList.length;
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView deviceNameTextView, deviceUUIDTextViewValue, deviceRSSIVTextViewValue;
public ViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
deviceNameTextView = itemView.findViewById(R.id.DeviceNameTextView);
deviceUUIDTextViewValue = itemView.findViewById(R.id.DeviceUUIDTextViewValue);
deviceRSSIVTextViewValue = itemView.findViewById(R.id.DeviceRSSIVTextViewValue);
}
#Override
public void onClick(View v) {
Log.i("DEBUG","Item RecyclerView Cliqué");
}
}
With that, you init your Adapter with list of Device Object, who can have any variable has you want without need to pass more array or data to Adapter:-)
And for make a new Device, and use it in RV
Device device = new Device();
device.setName("Device Name 01");
device.setUuid("uuid value");
device.SetRssi("rssi value");
ArrayList<Device> deviceList = new ArrayList<>();
deviceList.add(device);
//Init adapter and fill it
DeviceRecyclerView deviceRecyclerView = new DeviceRecyclerView(deviceList);
LinearLayoutManager llm = new LinearLayoutManager(getContext());
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(llm);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(deviceRecyclerView);

Doesn't show users in RecyclerView while using FirestoreRecyclerAdapter and DocumentReference

I am working on Cloud Firestore. My Firestore database document name is users and I want to show all users in Android RecyclerView and my activity name MainActivity and I'm using this XML file activity_main.xml.
It will showing a blank activity while on running.
activity_main.xml
<android.support.constraint.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"
android:padding="5dp"
tools:context="com.example.anuragtiwari.recyclerdemo.MainActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="0dp"
android:layout_height="0dp"
android:id="#+id/recyclerview_list"
android:layout_marginBottom="8dp"
android:layout_marginEnd="7dp"
android:layout_marginLeft="8dp"
android:layout_marginRight="7dp"
android:layout_marginStart="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.073"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="1.0"
android:layout_alignParentTop="true">
</android.support.v7.widget.RecyclerView>
</android.support.constraint.ConstraintLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private RecyclerView mUsersList;
private CollectionReference muser;
private FirestoreRecyclerAdapter adapter;
LinearLayoutManager linearLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mUsersList = (RecyclerView) findViewById(R.id.recyclerview_list);
mUsersList.setLayoutManager(new LinearLayoutManager(this));
muser = FirebaseFirestore.getInstance().collection("users");
Query query = muser;
FirestoreRecyclerOptions<Users> options = new FirestoreRecyclerOptions.Builder<Users>()
.setQuery(query, Users.class).build();
FirestoreRecyclerAdapter adapter = new FirestoreRecyclerAdapter<Users, FriendsHolder>(options)
{
#Override
public FriendsHolder onCreateViewHolder(ViewGroup group, int i)
{
View view = LayoutInflater.from(group.getContext())
.inflate(R.layout.single_user, group, false);
return new FriendsHolder(view);
}
#Override
public void onError(FirebaseFirestoreException e)
{
Log.e("error", e.getMessage());
}
#Override
protected void onBindViewHolder(FriendsHolder holder, int position, Users model) {
holder.nameText.setText(model.getName());
holder.emailText.setText(model.getEmail());
}
};
mUsersList.setAdapter(adapter);
}
private class FriendsHolder extends RecyclerView.ViewHolder
{
View mView;
public TextView nameText;
public TextView emailText;
public FriendsHolder(View itemview) {
super(itemview);
mView = itemview;
nameText = (TextView) mView.findViewById(R.id.single_user_name);
emailText = (TextView) mView.findViewById(R.id.single_user_email);
}
}
}
single_user.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_margin="15dp"
android:layout_height="match_parent">
<TextView
android:id="#+id/single_user_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="27dp"
android:layout_marginStart="27dp"
android:text="Display Name"
android:textColor="#android:color/black"
android:textSize="18sp"
android:textStyle="bold" />
<TextView
android:id="#+id/single_user_email"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/single_user_name"
android:layout_alignStart="#+id/single_user_name"
android:layout_below="#+id/single_user_name"
android:layout_marginTop="15dp"
android:text="User Email" />
<view
android:layout_width="match_parent"
android:layout_height="2dp"
android:layout_marginTop="60dp"
/>
</RelativeLayout>
Users.java
public class Users
{
public String name;
public String email;
public Users(){
}
public String getName() {
return name;
}
public void setName(String name) {
name = name;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
email = email;
}
public Users(String name, String email) {
this.name = name;
this.email = email;
}
}
**App Images**