Develop Reference

Data from the collection in the firestore is not output to the recycler

I'm creating an application in which I want to show about all guitar chords. To do this, I created a database with the name of the chords (chord_name) and I want to output it as a list (RecyclerView) in a fragment, but it doesn't come out. At the same time, the application works fine and nothing crashes, but the list is not shown
screen my application on phone
сlass FragmentChords
public class FragmentChords extends Fragment {
private FirebaseFirestore db = FirebaseFirestore.getInstance();
private CollectionReference chordsRef = db.collection("chords");
private ChordsAdapter adapter;
#Override
#PropertyName("chord_name")
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_chords, container, false);
RecyclerView recyclerView = view.findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(requireContext()));
Query query = chordsRef.orderBy("chord_name", Query.Direction.DESCENDING);
FirestoreRecyclerOptions<Chords> options = new FirestoreRecyclerOptions.Builder<Chords>()
.setQuery(query,Chords.class)
.build();
adapter = new ChordsAdapter(options);
recyclerView.setAdapter(adapter);
return view;
}
#Override
public void onStart() {
super.onStart();
adapter.startListening();
}
#Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
}
class Chords
public class Chords {
public String chord_name;
public Chords() {
}
public Chords(String chord_name) {
this.chord_name = chord_name;
}
#PropertyName("chord_name")
public String getChord_name() {
return chord_name;
}
public void setChord_name(String chord_name) {
this.chord_name = chord_name;
}
}
class ChordsAdapter
public class ChordsAdapter extends FirestoreRecyclerAdapter<Chords, ChordsAdapter.ChordsHolder> {
public ChordsAdapter(#NonNull FirestoreRecyclerOptions<Chords> options) {
super(options);
}
#Override
protected void onBindViewHolder(#NonNull ChordsHolder holder, int position, #NonNull Chords model) {
holder.textViewChordName.setText(model.getChord_name());
}
#NonNull
#Override
public ChordsHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_chords_item,
parent, false);
return new ChordsHolder(v);
}
class ChordsHolder extends RecyclerView.ViewHolder {
TextView textViewChordName;
public ChordsHolder(#NonNull View itemView) {
super(itemView);
textViewChordName = itemView.findViewById(R.id.chords_chord_name);
}
}
}
fragment_chords.xml
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/title_bar_layout_chords"
tools:listitem="#layout/recycler_chords_item" />
recycler_chords_item.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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:orientation="vertical"
app:cardBackgroundColor="#color/backgroundApp"
app:cardCornerRadius="8dp"
app:cardElevation="8dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="52dp"
android:layout_marginHorizontal="16dp"
android:orientation="horizontal">
<TextView
android:id="#+id/chords_chord_name"
android:layout_width="200dp"
android:layout_height="52dp"
android:gravity="center_vertical"
android:text="Chord name"
android:textColor="#color/textWhite"
android:textSize="20sp" />
<ImageView
android:id="#+id/chords_image_info"
android:layout_width="24dp"
android:layout_height="24dp"
android:layout_alignParentEnd="true"
android:layout_centerVertical="true"
android:background="?attr/selectableItemBackgroundBorderless"
android:src="#drawable/ic_info"
app:tint="#color/textWhite"
android:contentDescription="TODO" />
</RelativeLayout>
</androidx.cardview.widget.CardView>

How to add loading circle animation to image in recycerview before load android

I am a new application developer. I use recycerview to display a set of images to the user.What I want to do now if the image is still not shown to the user, it shows in each image a circular effect.I sorry for that. This question may have been asked a lot time before now, but I could not find an answer to my question.
What I need to do like the following picture:
How I can do that ?
MyAdapter:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
List<List_Data>list_data;
Context ct;
public MyAdapter(List<List_Data> list_data, Context ct) {
this.list_data = list_data;
this.ct = ct;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view= LayoutInflater.from(parent.getContext()).inflate(R.layout.list_data,parent,false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
final List_Data listData=list_data.get(position);
Picasso.with(ct)
.load(listData.getImageurl())
.into(holder.img);
}
#Override
public int getItemCount() {
return list_data.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private ImageView img;
public ViewHolder(View itemView) {
super(itemView);
img=(ImageView)itemView.findViewById(R.id.image_view);
}
}
}
MainActivity
private static final String HI = "https://uniqueandrocode.000webhostapp.com/hiren/androidtutorial/androidweb.php";
private List<List_Data> list_data;
private MyAdapter adapter;
private RecyclerView rv;
private JsonArrayRequest request;
private RequestQueue requestQueue;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
rv=(RecyclerView)findViewById(R.id.recycler_view);
rv.setHasFixedSize(true);
rv.setLayoutManager(new LinearLayoutManager(this));
list_data=new ArrayList<>();
getImageData();
}
private void getImageData() {
request=new JsonArrayRequest(HI, new Response.Listener<JSONArray>() {
#Override
public void onResponse(JSONArray response) {
JSONObject jsonObject=null;
for (int i=0; i<response.length(); i++){
try {
jsonObject=response.getJSONObject(i);
List_Data listData=new List_Data(jsonObject.getString("imageurl"));
list_data.add(listData);
} catch (JSONException e) {
e.printStackTrace();
}
}
setupData(list_data);
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
requestQueue= Volley.newRequestQueue(this);
requestQueue.add(request);
}
private void setupData(List<List_Data> list_data) {
adapter=new MyAdapter(list_data,this);
rv.setAdapter(adapter);
}
}
<?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">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</androidx.recyclerview.widget.RecyclerView>
</RelativeLayout>

You are required to add a progress bar on the top of the RecylerView item layout.
<?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">
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:srcCompat="#tools:sample/avatars" />
<ProgressBar
android:id="#+id/progressBar2"
style="?android:attr/progressBarStyle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="#+id/imageView3"
app:layout_constraintEnd_toEndOf="#+id/imageView3"
app:layout_constraintStart_toStartOf="#+id/imageView3"
app:layout_constraintTop_toTopOf="#+id/imageView3" />
</androidx.constraintlayout.widget.ConstraintLayout>
Now inside your RecyclerViewAdapter's onBindViewHolder(ViewHolder holder, int position) method.
Add this code:
holder.progressBar.setVisibility(View.VISIBLE);
Change this code:
Picasso.with(ct)
.load(listData.getImageurl())
.into(holder.img);
To:
Picasso.with(ct)
.load(listData.getImageurl())
.into(holder.img, new Callback(){
#Override
public void onSuccess() {
holder.progressBar.setVisibility(View.GONE);
}
#Override
public void onError() {
holder.progressBar.setVisibility(View.GONE);
}
});
And also update your ViewHolder Too.

Scrolling RecyclerView inside a RecyclerView Item

I have a RecyclerView with some dummy string data in each item. Each item has also a recyclerview which contains some other dummy data (A - Z, see below) that will be visible when a button is clicked.
The problem I have is that I can not scroll the recyclerview within the item as I want. When I scroll, only the outer recyclerview scrolls (as you seen below)
Here how is it look like:
Here are the code I wrote:
//MainActivity.java
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private StringAdapter mStringAdapter;
private ArrayList<String> mStrings = new ArrayList<>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mStrings.add("This");
mStrings.add("is");
mStrings.add("a");
mStrings.add("test");
mRecyclerView = (RecyclerView) findViewById(R.id.recyclerview);
mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
mStringAdapter = new StringAdapter(mStrings, this);
mRecyclerView.setAdapter(mStringAdapter);
}
}
Here, the adapter resonsible for the outer main recyclerview. Note that the recyclerview of each main recyclerview item gets visible when the button is clicked :
public class StringAdapter extends RecyclerView.Adapter<StringAdapter.ViewHolder> {
private ArrayList<String> mStrings;
private Context mContext;
private SomeInnerDataAdapter mSomeInnerDataAdapter;
public StringAdapter(ArrayList<String> strings, Context context) {
mStrings = strings;
mContext = context;
}
#NonNull
#Override
public StringAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());
View view = inflater.inflate(R.layout.item, viewGroup, false);
return new StringAdapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull StringAdapter.ViewHolder viewHolder, int i) {
String text = mStrings.get(i);
viewHolder.onBindText(text);
}
#Override
public int getItemCount() {
return mStrings.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView mTextView;
private RecyclerView mRecyclerView;
private Button mButton;
public ViewHolder(#NonNull View itemView) {
super(itemView);
mTextView = (TextView) itemView.findViewById(R.id.textView);
mRecyclerView = (RecyclerView) itemView.findViewById(R.id.someOtherData);
mButton = (Button) itemView.findViewById(R.id.button);
mButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(mContext, "Item is clicked", Toast.LENGTH_LONG).show();
mRecyclerView.setVisibility(View.VISIBLE);
ArrayList<String> strings = new ArrayList<>();
strings.add("A");
strings.add("B");
strings.add("C");
strings.add("D");
strings.add("E");
strings.add("F");
strings.add("G");
strings.add("H");
strings.add("I");
strings.add("J");
strings.add("K");
strings.add("L");
strings.add("M");
strings.add("N");
strings.add("O");
strings.add("P");
strings.add("R");
strings.add("S");
strings.add("T");
strings.add("U");
strings.add("V");
strings.add("W");
strings.add("X");
strings.add("Y");
strings.add("Z");
mRecyclerView.setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.VERTICAL, false));
mSomeInnerDataAdapter = new SomeInnerDataAdapter(strings, mContext);
mRecyclerView.setAdapter(mSomeInnerDataAdapter);
}
});
}
public void onBindText(String text){
mTextView.setText(text);
}
}
}
The adapter responsible for the recyclerview within a item:
public class SomeInnerDataAdapter extends RecyclerView.Adapter<SomeInnerDataAdapter.ViewHolder> {
private ArrayList<String> mStrings;
private Context mContext;
public SomeInnerDataAdapter(ArrayList<String> strings, Context context) {
mStrings = strings;
mContext = context;
}
#NonNull
#Override
public SomeInnerDataAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
LayoutInflater inflater = LayoutInflater.from(viewGroup.getContext());
View view = inflater.inflate(R.layout.someotherdata_item, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull SomeInnerDataAdapter.ViewHolder viewHolder, int i) {
String text = mStrings.get(i);
viewHolder.onBindString(text);
}
#Override
public int getItemCount() {
return mStrings.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView mTextView;
public ViewHolder(#NonNull View itemView) {
super(itemView);
mTextView = (TextView) itemView.findViewById(R.id.someotherdata_textview);
}
public void onBindString(String text){
mTextView.setText(text);
}
}
}
The xml layouts are the following:
// item.xml
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView"
android:layout_gravity="center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
<android.support.v7.widget.RecyclerView
android:id="#+id/someOtherData"
android:layout_gravity="right"
android:visibility="invisible"
android:layout_width="wrap_content"
android:layout_height="match_parent"
android:scrollbars="vertical" />
<Button
android:id="#+id/button"
android:text="show comment"
android:layout_gravity="bottom|center"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</FrameLayout>
and someotherdata_item.xml:
<TextView
android:id="#+id/someotherdata_textview"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
android:text="TextView"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android" />

Data from JSON does not appear on the RecyclerView layout

I have created RecyclerView and showing data from JSON.
Issue I'm facing is, while Toast data is showing correctly, but in RecyclerView same data is not appear.
Here is code:
public class MainActivity extends AppCompatActivity {
private static final int NUM_LIST_ITEMS = 100;
private static final String TOKEN =
"71cf2d3dec294394e267fbb0bf28916f4198f8d6";
private CuloAdapter culoAdapter;
List<Hotel> lh = new ArrayList<>();
RecyclerView recyclerView;
#Override
protected void attachBaseContext(Context newBase) {
super.attachBaseContext(newBase);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.rv_tiketapi);
LinearLayoutManager layout = new LinearLayoutManager(this);
layout.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layout);
CuloAdapter ar = new CuloAdapter(lh);
recyclerView.setAdapter(ar);
loadHotelLocation();
}
private void loadHotelLocation() {
final search apiService = ApiService.getService(search.class);
retrofit2.Call<SingleResult<Hotel>> call = apiService.findHotel(TOKEN,
"json");
call.enqueue(new Callback<SingleResult<Hotel>>() {
#Override
public void onResponse(retrofit2.Call<SingleResult<Hotel>> call,
Response<SingleResult<Hotel>> response) {
if (response.body().getDiagnostic().isSuccess()) {
//SingleResult.ResultList list =
response.body().getResults();
List<Hotel> mHotels = (List<Hotel>)
response.body().getResults().getResult();
lh.addAll(mHotels);
Toast.makeText(getApplicationContext(), "OK" +lh,
Toast.LENGTH_LONG).show();
}
}
#Override
public void onFailure(retrofit2.Call<SingleResult<Hotel>> call,
Throwable t) {
}
});
}
RecyclerView Adapter :
public class CuloAdapter extends
RecyclerView.Adapter<CuloAdapter.ViewHolder> {
public CuloAdapter(List<Hotel> lh) {
this.items = lh;
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView txtTitle;
public TextView txtSubTitle;
public ImageView imgIcon;
public ViewHolder(final View container) {
super(container);
txtTitle = (TextView) container.findViewById(R.id.airportName);
txtSubTitle = (TextView) container.findViewById(R.id.airportCode);
}
}
private List<Hotel> items;
public CuloAdapter(final Activity activity, List<Hotel> items) {
this.items = items;
}
#Override
public int getItemCount() {
return items.size();
}
#Override
public void onBindViewHolder(CuloAdapter.ViewHolder holder, int position) {
Hotel item = items.get(position);
holder.txtTitle.setText(item.getLabel());
holder.txtSubTitle.setText(item.getId());
}
#Override
public CuloAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int
viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_flight, parent, false);
return new ViewHolder(v);
}
}
MainActivity 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.example.admin.exampletiketapi.MainActivity">
<EditText
android:id="#+id/et_find"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAlignment="center" />
<android.support.v7.widget.RecyclerView
android:id="#+id/rv_tiketapi"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
Item List XML :
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/airportsLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp">
<TextView
android:id="#+id/airportName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="Soekarno Hatta" />
<TextView
android:id="#+id/airportCode"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="5dp"
android:text="20" />
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:layout_marginTop="5dp"
android:background="#DDD"
android:visibility="visible" />
</LinearLayout>

In your code you are trying to set adapter before loading data.
CuloAdapter ar = new CuloAdapter(lh);
recyclerView.setAdapter(ar);
loadHotelLocation();
What i found is You are getting data in loadHotelLocation(), but trying to set adpter before that,

Call notifyDatasetChanged after lh.addAll(mHotels). And check for null's else you are heading for crash in case search results are zero/null

RecyclerView does not display items

I am using RecyclerView in Android with a model class that has title and details. Nothing is showing. Even after log inside Adapter nothing is shown in Android Monitor.
MainActivity.class
public ArrayList<Menu> menu_list;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_menu);
initUi();
}
public void initUi(){
RecyclerView menu_recycler = (RecyclerView) findViewById(R.id.main_menu_recycler_view);
//set the layout manager
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(this);
linearLayoutManager.setOrientation( linearLayoutManager.VERTICAL );
menu_recycler.setLayoutManager( linearLayoutManager );
//set adapter
MainMenuAdapter mainMenuAdapter = new MainMenuAdapter( getMenulist() );
menu_recycler.setAdapter( mainMenuAdapter );
}
public ArrayList<Menu> getMenulist() {
menu_list = new ArrayList<Menu>();
menu_list.add( new Menu("About Us", " Learn more about our values, mission and vision ") );
menu_list.add( new Menu("Services ", " In implementing its mandate, the Agency will provide the following to its external and internal customers:\n"));
menu_list.add( new Menu("Stakeholders", " Who are the key players, Find out more") );
menu_list.add( new Menu("Learn about Counterfeits", "Gain more insight on counterfeit products"));
return menu_list;
}
and here is my adapter
public class MainMenuAdapter extends RecyclerView.Adapter<MainMenuAdapter.MyViewHolder> {
public List<Menu> list_of_menus;
public MainMenuAdapter( List<Menu> list_of_menus){
this.list_of_menus = list_of_menus;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.row,parent, false);
return new MyViewHolder(v);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
Menu menu = list_of_menus.get(position);
Log.e("MENU IN ADAPTER TITLE", menu.title);
holder.title_text.setText( menu.title );
holder.details_text.setText( menu.details );
}
#Override
public int getItemCount() {
return 0;
}
/*
View Holder class
* */
public class MyViewHolder extends RecyclerView.ViewHolder{
public TextView title_text, details_text;
public MyViewHolder(View itemView) {
super(itemView);
title_text = (TextView) itemView.findViewById(R.id.menu_title);
details_text = (TextView) itemView.findViewById(R.id.menu_details);
}
}
}
And the Model Class
public class Menu {
public String title, details;
public Menu(String title, String details){
this.details = details;
this.title = title;
}
}
And the layout file main_activity
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.maos.aca.MainMenuActivity">
<android.support.v7.widget.RecyclerView
android:layout_width="334dp"
android:layout_height="453dp" app:layout_constraintTop_toTopOf="parent"
android:layout_marginTop="8dp" app:layout_constraintBottom_toBottomOf="parent"
android:layout_marginBottom="8dp" android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent" android:layout_marginRight="8dp"
app:layout_constraintRight_toRightOf="parent" android:id="#+id/main_menu_recycler_view"
android:scrollbars="vertical"/>
</android.support.constraint.ConstraintLayout>
And finally the row
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="wrap_content"
android:layout_height="wrap_content">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/menu_title"
android:textStyle="bold"
/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/app_name"
android:id="#+id/menu_details"/>
</LinearLayout>
I know this question has been asked before, but none of the answers helped me out.I'll appreciate any lead.

You need to change the getItemCount() method to this:
#Override
public int getItemCount() {
return list_of_menus.size();
}
The RecyclerView will not display any elements if you are reporting that its size is zero.

Change this:
#Override
public int getItemCount() {
return 0;
}
To this:
#Override
public int getItemCount() {
return list_of_menus.size();
}