5.4. ScrollView and HorizontalScrollView
ScrollView allows us to scroll vertically on any item that is included inside the view. In the example below, we place a 1024dpx1024dp image inside a ScrollView that allows you to scroll vertically.
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:layout_width="1024dp"
android:layout_height="1024dp"
android:src="@drawable/moon"
android:scaleType="centerCrop"
android:background="#ff0000"
/>
</ScrollView>
Similarly, if we want to scroll horizontally, we must use a HorizontalScrollView. If we need both types of scrolls, we can nest a ScrollView and a HorizontalScrollView.
<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<HorizontalScrollView
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="@+id/image"
android:layout_width="1024dp"
android:layout_height="1024dp"
android:src="@drawable/moon"
android:scaleType="centerCrop"
android:background="#ff0000"
/>
</HorizontalScrollView>
</ScrollView>
There is one important issue to keep in mind: we should not combine ScrollView with items that already have vertical scrolls such as the RecyclerView or ListView.