Layout Inflater

Instantiates a layout XML file into its corresponding View objects. It is never used directly. Instead, use getLayoutInflater() or getSystemService(Class) to retrieve a standard LayoutInflater instance that is already hooked up to the current context and correctly configured for the device you are running on. For example:

LayoutInflater inflater = (LayoutInflater)context.getSystemService               (Context.LAYOUT_INFLATER_SERVICE);

To create a new LayoutInflater with an additional LayoutInflater.Factory for your own views, you can use cloneInContext(Context) to clone an existing ViewFactory, and then call setFactory(LayoutInflater.Factory) on it to include your Factory.

ScrollView

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 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 LinearLayout in a vertical orientation, presenting a vertical array of top-level items that the user can scroll through.

You should never use a ScrollView with a 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.

The 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.

Verical Scrollview
Note: Scroll views must and should apply for layouts, won’t apply for widgets.

<ScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
  Note:  here you can put your content
</LinearLayout>
</ScrollView

ScrollView only supports vertical scrolling. For horizontal scrolling, use Horizontal ScrollView.

<HorizontalScrollView
    android:layout_width="match_parent"
    android:layout_height="wrap_content">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical">
Note:  here you can put your content
</LinearLayout>
</HorizontalScrollView>