Java – How do I implement the Firebase Recycler Adapter in newer versions of Android 3.1 and later?

Basically, what I want to do is use the FirebaseRecyclerAdapter and populate the RecyclerView with my custom-designed CardView. The code for the new version has changed, therefore, I tried to implement it without success.
This is the code I wrote a year ago and it works well and populates my RecyclerView:

FirebaseRecyclerAdapter<DataClass,DataViewHolder> FBRA= new FirebaseRecyclerAdapter<DataClass, DataViewHolder>(
            DataClass,
            R.layout.myCardView,
            DataViewHolder.class,
            databaseReference
    ) {
        @Override
        protected void populateViewHolder(DataViewHolder viewHolder, DataClass model, int position) {
            viewHolder.setTitle(model.gettitle());
            viewHolder.setDate(model.getDate());
        }
   }; 
  myRecyclerView.setAdapter(FBRA);

Now we have to use something like this,
But the problem is that this code is not populating my recyclerView (what changes do I need to make here to populate my recyclerView with my cardView?). )

@Override
protected void onStart() {
    super.onStart();

Query query = FirebaseDatabase.getInstance()
            .getReference()
            .child("Official_Services");

FirebaseRecyclerOptions<ServiceClass> options = new FirebaseRecyclerOptions.Builder<ServiceClass>()
            .setQuery(query, ServiceClass.class)
            .build();

FirebaseRecyclerAdapter<ServiceClass, ServiceViewHolder> FBRA = new FirebaseRecyclerAdapter<ServiceClass, ServiceViewHolder>(options) {

@NonNull
        @Override
        public ServiceViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {

View view = LayoutInflater.from(HomeActivity.this).inflate(R.layout.service_card, parent, false);

return new ServiceViewHolder(view);

}

@Override
        protected void onBindViewHolder(@NonNull ServiceViewHolder holder, int position, @NonNull ServiceClass model) {

holder.setServiceName(model.getServiceName());

holder.setServiceCaption(model.getServiceCaption());

}

};

mServiceList.setAdapter(FBRA);

}

This is my ViewHolder class:

public static class ServiceViewHolder extends RecyclerView.ViewHolder {

public ServiceViewHolder(View itemView) {

super(itemView);

View mView = itemView;

}

public void setServiceName(String serviceName) {

TextView sName = itemView.findViewById(R.id.serviceName);

sName.setText(serviceName);

}

public void setServiceCaption(String serviceCaption) {

TextView sCaption = itemView.findViewById(R.id.serviceCap);

sCaption.setText(serviceCaption);
    }

}

Here are my getter and setter model classes:

public class ServiceClass {

private String serviceName;
private String serviceCode;
private String serviceCaption;
private String serviceIconUrl;

public ServiceClass() {
}

public ServiceClass(String serviceName, String serviceCode, String serviceCaption, String serviceIconUrl) {
    this.serviceName = serviceName;
    this.serviceCode = serviceCode;
    this.serviceCaption = serviceCaption;
    this.serviceIconUrl = serviceIconUrl;
}

public String getServiceName() {
    return serviceName;
}

public String getServiceCode() {
    return serviceCode;
}

public String getServiceCaption() {
    return serviceCaption;
}

public String getServiceIconUrl() {
    return serviceIconUrl;
}

public void setServiceName(String serviceName) {
    this.serviceName = serviceName;
}

public void setServiceCode(String serviceCode) {
    this.serviceCode = serviceCode;
}

public void setServiceCaption(String serviceCaption) {
    this.serviceCaption = serviceCaption;
}

public void setServiceIconUrl(String serviceIconUrl) {
    this.serviceIconUrl = serviceIconUrl;
}

@Override
public String toString() {
    return "ServiceClass{" +
            "serviceName='" + serviceName + '\'' +
            ", serviceCode='" + serviceCode + '\'' +
            ", serviceCaption='" + serviceCaption + '\'' +
            ", serviceIconUrl='" + serviceIconUrl + '\'' +
            '}';
}
}

What changes do I need to make now?

Here is my entire java file:

public class HomeActivity extends AppCompatActivity {

private RecyclerView mServiceList;

private FirebaseDatabase mDatabase;

private DatabaseReference myRef;

FirebaseRecyclerAdapter<ServiceClass, ServiceViewHolder> FBRA;

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);

BottomNavigationViewEx bottomNavigationViewEx = findViewById(R.id.navViewBar);

bottomNavigationViewEx.enableAnimation(false);

bottomNavigationViewEx.enableShiftingMode(false);

bottomNavigationViewEx.setTextVisibility(false);

Calligrapher calligrapher = new Calligrapher(this);

calligrapher.setFont(this, "Helvetica.ttf", true);

mServiceList = findViewById(R.id.serviceRV);

mServiceList.setHasFixedSize(true);

mServiceList.setLayoutManager(new LinearLayoutManager(this));

mDatabase = FirebaseDatabase.getInstance();

myRef = mDatabase.getReference().child("Official_Services");

}

@Override
    protected void onStart() {
        super.onStart();

FBRA.startListening();

Query query = myRef;

FirebaseRecyclerOptions<ServiceClass> options = new FirebaseRecyclerOptions.Builder<ServiceClass>()
                .setQuery(query, ServiceClass.class)
                .build();

FBRA = new FirebaseRecyclerAdapter<ServiceClass, ServiceViewHolder>(options) {

@NonNull
            @Override
            public ServiceViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int i) {

View view = LayoutInflater.from(HomeActivity.this).inflate(R.layout.service_card, parent, false);

return new ServiceViewHolder(view);

}

@Override
            protected void onBindViewHolder(@NonNull ServiceViewHolder holder, int position, @NonNull ServiceClass model) {

holder.setServiceName(model.getServiceName());

holder.setServiceCaption(model.getServiceCaption());

}

};

mServiceList.setAdapter(FBRA);

}

public static class ServiceViewHolder extends RecyclerView.ViewHolder {

public ServiceViewHolder(View itemView) {

super(itemView);

View mView = itemView;

}

public void setServiceName(String serviceName) {

TextView sName = itemView.findViewById(R.id.serviceName);

sName.setText(serviceName);

}

public void setServiceCaption(String serviceCaption) {

TextView sCaption = itemView.findViewById(R.id.serviceCap);

sCaption.setText(serviceCaption);
        }

}

}

To be able to display data from the Firebase live database, you need to start listening for changes, and for this you should add the following line of code method to onStart():

@Override
protected void onStart() {
    super.onStart();
    FBRA.startListening();
}

To stop listening for changes, you need to add the following line of code in onStop() like this:

@Override
protected void onStop() {
    super.onStop();
    if(FBRA != null) {
        FBRA.stopListening();
    }
}

See me in this The answer in post I explained in it why you should remove the listener.

Also don’t forget to make an FBRA global variable and remove FirebaseRecyclerAdapter<ServiceClass, ServiceViewHolder> declarations from objects.