Quick way of implementing a parallax effect for a ViewPager with two pages

TwoPageParallaxViewPagerActivity.java

public class MainActivity extends AppCompatActivity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    
    ViewPager viewPager = (ViewPager) findViewById(R.id.view_pager);
    MyViewPagerAdapter adapter = new MyViewPagerAdapter(getSupportFragmentManager());
    viewPager.setAdapter(adapter);
    
    DisplayMetrics metrics = getDefaultDisplayMetrics(this);
    //Fullscreen background ImageView, with MATCH_PARENT params for width and height.
    ImageView parallaxBackground = (ImageView) findViewById(R.id.parallax_background);
    parallaxBackground.getLayoutParams().width = ((int)(metrics.widthPixels * 1.1F));
    
    final int offsetSize = ((int)(metrics.widthPixels * 1.1F) - metrics.widthPixels);
    parallaxBackground.setX(-offsetSize);
    
    ParallaxListener listener = new ParallaxListener(parallaxBackground, offsetSize);
    viewPager.addOnPageChangeListener(listener);
  
  }
  
  private static DisplayMetrics getDefaultDisplayMetrics(Context context) {
    return context.getResources().getDisplayMetrics();
  }
  
  static class ParallaxListener implements ViewPager.OnPageChangeListener {
  
    private ImageView mImageView;
    private final int offsetSize;

    ParallaxListener(ImageView imageView, int offsetSize) {
      mImageView = imageView;
      this.offsetSize = offsetSize;
    }

    @Override
    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
      if (position == 1) {
        positionOffset = 1;
      }

      int offset = (int) (-offsetSize + (offsetSize * positionOffset));
      mImageView.setX(offset);
    }

    @Override
    public void onPageSelected(int position) {}

    @Override
    public void onPageScrollStateChanged(int state) {}
  
  }