Android with|without Databinding

with.java

package app.com.datrios.activities;

import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;

import com.jaeger.library.StatusBarUtil;

import java.util.ArrayList;

import app.com.datrios.Library.interfaces.DataHandler;
import app.com.datrios.R;
import app.com.datrios.Repository;
import app.com.datrios.adapters.LeaderBoard.LeaderBoardAdapter;
import app.com.datrios.databinding.ActivityLeaderBoardBinding;
import app.com.datrios.models.Leaderboard;

public class LeaderBoardActivity extends AppCompatActivity {

    ArrayList<Leaderboard> leaderboards = new ArrayList<>();
    LeaderBoardAdapter leaderBoardAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        final ActivityLeaderBoardBinding binding = DataBindingUtil.setContentView(this, R.layout.activity_leader_board);

        initToolbar();

        leaderBoardAdapter = new LeaderBoardAdapter(this, leaderboards);
        RecyclerView recyclerView = findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));
        recyclerView.setAdapter(leaderBoardAdapter);

        Repository.getLeaderBoard(new DataHandler<Leaderboard>() {
            @Override
            public void onSuccess(ArrayList<Leaderboard> objects, int source) {
                leaderboards.clear();
                leaderboards.addAll(objects);

                if (leaderboards.size() > 3) {
                    binding.setFirst(leaderboards.get(0));
                    binding.setSecond(leaderboards.get(1));
                    binding.setThird(leaderboards.get(2));

                    leaderboards.clear();
                    leaderboards.addAll(objects.subList(3, (objects.size() - 1)));
                    leaderBoardAdapter.notifyDataSetChanged();
                }
            }
        });
    }

    private void initToolbar() {
        Toolbar toolbar = findViewById(R.id.toolbar);
        StatusBarUtil.setTranslucentForImageView(this, toolbar);

        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);
    }
}

without.java

package app.com.datrios.activities;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.google.gson.Gson;
import com.google.gson.reflect.TypeToken;
import com.jaeger.library.StatusBarUtil;
import com.squareup.picasso.Picasso;

import java.util.ArrayList;
import java.util.List;

import app.com.datrios.Library.interfaces.DataHandlerInterface;
import app.com.datrios.R;
import app.com.datrios.Repository;
import app.com.datrios.adapters.LeaderBoard.LeaderBoardAdapter;
import app.com.datrios.models.LeaderBoard.LeaderBoardModel;
import de.hdodenhof.circleimageview.CircleImageView;

public class LeaderBoardActivity extends AppCompatActivity {

    private Toolbar toolbar;
    private LinearLayout st1Container;
    private TextView st1UserName;
    private TextView st1Points;
    private LinearLayout st2Container;
    private TextView st2UserName;
    private TextView st2Points;
    private LinearLayout st3Container;
    private TextView st3UserName;
    private TextView st3Points;
    private RecyclerView recyclerView;
    private CircleImageView st1_user_photo;
    private CircleImageView st2_user_photo;
    private CircleImageView st3_user_photo;

    private void initView() {
        toolbar = findViewById(R.id.toolbar);
        st1Container = findViewById(R.id.st1_container);
        st1UserName = findViewById(R.id.st1_user_name);
        st1Points = findViewById(R.id.st1_points);
        st2Container = findViewById(R.id.st2_container);
        st2UserName = findViewById(R.id.st2_user_name);
        st2Points = findViewById(R.id.st2_points);
        st3Container = findViewById(R.id.st3_container);
        st3UserName = findViewById(R.id.st3_user_name);
        st3Points = findViewById(R.id.st3_points);
        recyclerView = findViewById(R.id.recycler_view);

        st1_user_photo = findViewById(R.id.st1_user_photo);
        st2_user_photo = findViewById(R.id.st2_user_photo);
        st3_user_photo = findViewById(R.id.st3_user_photo);
    }

    ArrayList<LeaderBoardModel> leaderBoardModels = new ArrayList<>();
    LeaderBoardAdapter adapter;

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

        StatusBarUtil.setTranslucentForImageView(this, toolbar);

        setSupportActionBar(toolbar);
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setDisplayShowHomeEnabled(true);


        adapter = new LeaderBoardAdapter(this, leaderBoardModels);
        RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
        recyclerView.setHasFixedSize(true);
        recyclerView.setLayoutManager(new LinearLayoutManager(this));

        recyclerView.setAdapter(adapter);

        Repository.getLeaderBoard(new DataHandlerInterface<LeaderBoardModel>() {
            @Override
            public void onSuccess(ArrayList<LeaderBoardModel> objects, int source) {
                leaderBoardModels.clear();
                leaderBoardModels.addAll(objects);

                if (leaderBoardModels.size() > 3) {

                    st1UserName.setText(leaderBoardModels.get(0).getName());
                    st1Points.setText(leaderBoardModels.get(0).getPoints() + "");
                    Picasso.with(LeaderBoardActivity.this).load(leaderBoardModels.get(0).getPhoto()).into(st1_user_photo);

                    st2UserName.setText(leaderBoardModels.get(1).getName());
                    st2Points.setText(leaderBoardModels.get(1).getPoints() + "");
                    Picasso.with(LeaderBoardActivity.this).load(leaderBoardModels.get(1).getPhoto()).into(st2_user_photo);

                    st3UserName.setText(leaderBoardModels.get(2).getName());
                    Picasso.with(LeaderBoardActivity.this).load(leaderBoardModels.get(2).getPhoto()).into(st3_user_photo);
                    st3Points.setText(leaderBoardModels.get(2).getPoints() + "");

                    leaderBoardModels.clear();
                    leaderBoardModels.addAll(objects.subList(3, (objects.size() - 1)));

                    adapter.notifyDataSetChanged();
                }
            }

            @Override
            public void onSuccess(LeaderBoardModel leaderBoardModel, int source) {

            }

            @Override
            public void onFail(Exception e) {

            }

            @Override
            public void onFail(Object o, boolean isConnectToInternet) {

            }
        });
    }


    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                finish();
                break;
        }

        return super.onOptionsItemSelected(item);
    }
}