Android ViewPager 3Implementation Method of D Gallery

ViewPager has a method called:

setPageTransformer(boolean reverseDrawingOrder, PageTransformer transformer)

Used to set the animation effect when switching ViewPager.

Here we just need to customize a PageTransformer to achieve the animation offset effect we need!

public class ScrollOffsetTransformer implements PageTransformer {
  private static final float MIN_SCALE = 0.85F;
  /**
   * The position parameter indicates the position of the given page relative to the center of the screen. It is a dynamic property that changes as the page scrolls.
   * When a page (page) fills the entire screen, the positoin value is 0; when a page (page) just leaves the right (left) side of the screen, the position value is1(-1);
   * When both pages have scrolled halfway, one of the pages is-0.5, the other page is 0.5.
   * Based on the position of the page on the screen, through methods such as setAlpha(), setTranslationX
   * use methods like setScaleY() to set the properties of the page, creating a custom sliding animation.
   */
  @Override
  public void transformPage(View view, float position) {
    // TODO Auto-generated method stub
    float scaleFactor = Math.max(MIN_SCALE, 1 - Math.abs(position));
    float rotate = 30 * Math.abs(position);
    float transla = 50 * Math.abs(position);
    if (position > 0) {
      view.setScaleX(scaleFactor);
      view.setScaleY(scaleFactor);
      view.setRotationY(-rotate);
      view.setTranslationX(-transla);
    } else {
      view.setScaleX(scaleFactor);
      view.setScaleY(scaleFactor);
      view.setRotationY(rotate);
      view.setTranslationX(transla);
    }
  }
}

then

viewPager

plus

 viewPager.setPageTransformer(true, new ScrollOffsetTransformer())

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