@Override int getMinHeight() {
    return Math.max(super.getMinHeight(), mMinStripHeight);
  }
Return whether or not this tab strip will draw a full-width underline.
This defaults to true if no background is set.

@return true if this tab strip will draw a full-width underline in the
current tab indicator color.
sample/src/main/java/android/support/v4/view/PagerTabStripV22.java