How to use

clamp

method

in

android.support.v4.math.MathUtils

@Override
public int clampViewPositionVertical(View child, int top, int dy) {
  return MathUtils.clamp(top, mMinOffset, mHideable ? mParentHeight : mMaxOffset);
}

@Override
public int clampViewPositionVertical(View child, int top, int dy) {
  return MathUtils.clamp(top, mMinOffset, mHideable ? mParentHeight : mMaxOffset);
}

/**
 * Set the value indicating the current scroll value. This decides how much of the
 * background will be displayed, as well as the title metrics/positioning.
 *
 * A value of {@code 0.0} indicates that the layout is fully expanded.
 * A value of {@code 1.0} indicates that the layout is fully collapsed.
 */
void setExpansionFraction(float fraction) {
  fraction = MathUtils.clamp(fraction, 0f, 1f);
  if (fraction != mExpandedFraction) {
    mExpandedFraction = fraction;
    calculateCurrentOffsets();
  }
}

int calendarOffset = MathUtils.clamp(
    getTopAndBottomOffset() - dy, calendarMinOffset, 0);
setTopAndBottomOffset(calendarOffset);
if (behavior instanceof CalendarScrollBehavior) {
  final CalendarScrollBehavior listBehavior = (CalendarScrollBehavior) behavior;
  int listOffset = MathUtils.clamp(
      listBehavior.getTopAndBottomOffset() - dy, -listMaxOffset, 0);
  listBehavior.setTopAndBottomOffset(listOffset);

  @Override
  public void run() {
    float translation = (isVertical() ? mRecyclerView.getTranslationY() : mRecyclerView.getTranslationX());
    float fraction = MathUtils.clamp(Math.abs((translation / getDragThreshold())), 0f, 1f);
    int scroll = (int) (0f - translation * Math.pow(fraction, SCROLL_EXPONENT));
    if (Math.abs(scroll) > 0 && (isVertical() && mRecyclerView.canScrollVertically(scroll) || !isVertical() && mRecyclerView.canScrollHorizontally(scroll))) {
      if (mScrollCallbacks != null)
        mScrollCallbacks.onScrolled((translation > 0 ? 1f : -1) * fraction);
      mRecyclerView.scrollBy(isVertical() ? 0 : scroll, isVertical() ? scroll : 0);
    }
    mRecyclerView.post(mScrollByRunnable);
  }
};

offsetHelper.setTopAndBottomOffset(MathUtils.clamp(
    -verticalOffset, 0, getMaxOffsetForPinChild(child)));
break;