How to use

isFakeDragging

method

in

androidx.viewpager.widget.ViewPager

private static void settleViewPagerIfFinished(ViewPager pager, @NonNull MotionEvent event) {
  if (event.getActionMasked() == MotionEvent.ACTION_UP
      || event.getActionMasked() == MotionEvent.ACTION_CANCEL) {
    // Hack: if ViewPager is not settled we should force it to do so, fake drag will help
    try {
      // Pager may throw an annoying exception if there are no internal page state items
      pager.beginFakeDrag();
      if (pager.isFakeDragging()) {
        pager.endFakeDrag();
      }
    } catch (Exception ignored) {
    }
  }
}

private void passEventToViewPager(@NonNull MotionEvent event) {
  if (viewPager == null) {
    return;
  }
  MotionEvent fixedEvent = obtainOnePointerEvent(event);
  fixedEvent.setLocation(lastViewPagerEventX, 0f);
  if (isViewPagerInterceptedScroll) {
    viewPager.onTouchEvent(fixedEvent);
  } else {
    isViewPagerInterceptedScroll = viewPager.onInterceptTouchEvent(fixedEvent);
  }
  // If ViewPager intercepted touch it will settle itself automatically,
  // but if touch was not intercepted we should settle it manually
  if (!isViewPagerInterceptedScroll && hasViewPagerX()) {
    settleViewPagerIfFinished(viewPager, event);
  }
  // Hack: ViewPager has bug when endFakeDrag() does not work properly. But we need to ensure
  // ViewPager is not in fake drag mode after settleViewPagerIfFinished()
  try {
    if (viewPager != null && viewPager.isFakeDragging()) {
      viewPager.endFakeDrag();
    }
  } catch (Exception ignored) {
  }
  fixedEvent.recycle();
}

  if (mViewPager.isFakeDragging() || mViewPager.beginFakeDrag()) {
    mViewPager.fakeDragBy(deltaX);
if (mViewPager.isFakeDragging()) mViewPager.endFakeDrag();
break;