Merge "docs: Update ScrollView JavaDoc comments" into oc-dev am: 47ca22e3

import java.util.List;

/**

 * Layout container for a view hierarchy that can be scrolled by the user,

 * allowing it to be larger than the physical display.  A ScrollView

 * is a {@link FrameLayout}, meaning you should place one child in it

 * containing the entire contents to scroll; this child may itself be a layout

 * manager with a complex hierarchy of objects.  A child that is often used

 * is a {@link LinearLayout} in a vertical orientation, presenting a vertical

 * array of top-level items that the user can scroll through.

 * <p>You should never use a ScrollView with a {@link ListView}, because

 * ListView takes care of its own vertical scrolling.  Most importantly, doing this

 * defeats all of the important optimizations in ListView for dealing with

 * large lists, since it effectively forces the ListView to display its entire

 * list of items to fill up the infinite container supplied by ScrollView.

 * <p>The {@link TextView} class also

 * takes care of its own scrolling, so does not require a ScrollView, but

 * using the two together is possible to achieve the effect of a text view

 * within a larger container.

 * A view group that allows the view hierarchy placed within it to be scrolled.

 * Scroll view may have only one direct child placed within it.

 * To add multiple views within the scroll view, make

 * the direct child you add a view group, for example {@link LinearLayout}, and

 * place additional views within that LinearLayout.

 *

 * <p>ScrollView only supports vertical scrolling. For horizontal scrolling,

 * use {@link HorizontalScrollView}.

 * <p>Scroll view supports vertical scrolling only. For horizontal scrolling,

 * use {@link HorizontalScrollView} instead.</p>

 *

 * <p>Never add a {@link android.support.v7.widget.RecyclerView} or {@link ListView} to

 * a scroll view. Doing so results in poor user interface performance and a poor user

 * experience.</p>

 *

 * <p class="note">

 * For vertical scrolling, consider {@link android.support.v4.widget.NestedScrollView}

 * instead of scroll view which offers greater user interface flexibility and

 * support for the material design scrolling patterns.</p>

 *

 * <p>To learn more about material design patterns for handling scrolling, see

 * <a href="https://material.io/guidelines/patterns/scrolling-techniques.html#">

 * Scrolling techniques</a>.</p>

 *

 * @attr ref android.R.styleable#ScrollView_fillViewport

 */