MainActivity

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private ViewPager viewPager;
    private ViewPagerAdapter adapter;


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

        viewPager = (ViewPager) findViewById(R.id.viewpager);
        viewPager.setOffscreenPageLimit(2);

        setupViewPager();
    }

    public void setupViewPager() {

        adapter = new ViewPagerAdapter();

        adapter.addView(new Step1Presenter(this, findViewById(R.id.step1_layout)));
        adapter.addView(new Step2Presenter(this, findViewById(R.id.step2_layout)));
        adapter.addView(new Step3Presenter(this, findViewById(R.id.step3_layout)));

        viewPager.setAdapter(adapter);

    }
}