malikkurosaki firebase ui recyclerview

Dapat.java

package com.malik.rajanepikep;

public class Dapat {
    private String nama;
    private String alamat;

    public Dapat(){}

    public Dapat(String nama, String alamat) {
        this.nama = nama;
        this.alamat = alamat;
    }

    public String getNama() {
        return nama;
    }

    public void setNama(String nama) {
        this.nama = nama;
    }

    public String getAlamat() {
        return alamat;
    }

    public void setAlamat(String alamat) {
        this.alamat = alamat;
    }
}

main.java

package com.malik.rajanepikep;
import android.content.Intent;
import android.support.annotation.NonNull;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.Toast;
import com.firebase.ui.auth.AuthUI;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;

import java.util.Collections;
import java.util.List;


public class MainActivity extends AppCompatActivity {

    private static final int RC_SIGN_IN = 123;
    private List<AuthUI.IdpConfig> providers;
    private DatabaseReference reference;
    private FirebaseRecyclerAdapter<Dapat,MyAdapter> adapter;

    public MainActivity() {
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        FirebaseUser user = FirebaseAuth.getInstance().getCurrentUser();
        reference = FirebaseDatabase.getInstance().getReference();




        Boolean sudahMasuk = user != null;

        providers = Collections.singletonList(
                new AuthUI.IdpConfig.PhoneBuilder().build()
        );


        final Button masuk = findViewById(R.id.tombol1);
        Button keluar = findViewById(R.id.keluar);



        if (sudahMasuk){
            masuk.setVisibility(View.GONE);
            keluar.setVisibility(View.VISIBLE);
            String phoneNumber = user.getPhoneNumber();
            Toast.makeText(getApplicationContext(), phoneNumber,Toast.LENGTH_LONG).show();

        }else {
            masuk.setVisibility(View.VISIBLE);
            keluar.setVisibility(View.GONE);
            masuk.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    login();
                }
            });
        }


        keluar.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                AuthUI.getInstance().signOut(getApplicationContext())
                .addOnCompleteListener(new OnCompleteListener<Void>() {
                    @Override
                    public void onComplete(@NonNull Task<Void> task) {
                        finish();
                        startActivity(getIntent());
                    }
                });
            }
        });

        Query query = FirebaseDatabase.getInstance().getReference().child("user");
        FirebaseRecyclerOptions<Dapat> options = new FirebaseRecyclerOptions.Builder<Dapat>()
                .setQuery(reference,Dapat.class).build();
        adapter = new FirebaseRecyclerAdapter<Dapat, MyAdapter>(options) {
            @Override
            protected void onBindViewHolder(@NonNull MyAdapter holder, int position, @NonNull Dapat model) {
                holder.nama.setText(model.getNama());
                holder.alamat.setText(model.getAlamat());
                Toast.makeText(getApplicationContext(),model.getAlamat(),Toast.LENGTH_LONG).show();
            }

            @NonNull
            @Override
            public MyAdapter onCreateViewHolder(@NonNull ViewGroup viewGroup, int i) {
                View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.orang,viewGroup,false);

                return new MyAdapter(view);
            }
        };

        RecyclerView recyclerView = findViewById(R.id.wadah);
        LinearLayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
        recyclerView.setLayoutManager(layoutManager);
        adapter.startListening();
        recyclerView.setAdapter(adapter);

    }


    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        if (requestCode == RC_SIGN_IN){
            if (resultCode == RESULT_OK){
                Toast.makeText(getApplicationContext(),"anda masuk ya",Toast.LENGTH_LONG).show();
                finish();
                startActivity(getIntent());

            }else {
                Toast.makeText(getApplicationContext(),"gagal masuk",Toast.LENGTH_LONG).show();
                finish();
                startActivity(getIntent());
            }
        }
    }


    public void login(){
        startActivityForResult(
                AuthUI.getInstance()
                    .createSignInIntentBuilder()
                    .setAvailableProviders(providers)
                    .setLogo(R.drawable.mobil)
                    .build(),RC_SIGN_IN
        );
    }

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

    @Override
    protected void onStop() {
        super.onStop();
        adapter.stopListening();
    }
}

MyAdapter.java

package com.malik.rajanepikep;

import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.TextView;

public class MyAdapter extends RecyclerView.ViewHolder {
    public TextView nama,alamat;
    public MyAdapter(@NonNull View itemView) {
        super(itemView);
        nama = itemView.findViewById(R.id.namanya);
        alamat = itemView.findViewById(R.id.alamatnya);
    }
}

tutorial https://www.youtube.com/watch?v=KOUyvCkwRss