How to customize a listView (scrolling)?

Creating the custom color in the res / values / colors.xml path:

<color name="apptheme_color">#DA4A38</color>

You can add to the res / values / strings.xml path, the items will be shown later in the interface, such as:

<string-array name="fruits_array">
    <item>Apples</item>
    <item>Apricots</item>
    <item>Avocado</item>
    <item>Annona</item>
    <item>Banana</item>  
    <item>Bilberry</item>
    <item>Blackberry</item>
</string-array>

Layout of activity activity_main.xml in the res / layout path:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="5dp"
    tools:context=".MainActivity" >

<ListView
    android:id="@android:id/list"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:scrollbarStyle="outsideOverlay" />

</RelativeLayout>

Layout of the list_item.xml items in the res / layout path:

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/txt_title"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:paddingBottom="10dp"
    android:paddingLeft="15dp"
    android:paddingTop="10dp" />

Scrollbar style should be added in the path res / values / styles.xml :

<resources>

    <style name="AppBaseTheme" parent="android:Theme.Light">
    </style>

    <style name="AppTheme" parent="AppBaseTheme">
        <item name="android:fastScrollThumbDrawable">@drawable/fastscroll_thumb_holo</item>
        <item name="android:fastScrollOverlayPosition">atThumb</item>
        <item name="android:fastScrollTextColor">@color/apptheme_color</item>
        <item name="android:fastScrollTrackDrawable">@drawable/fastscroll_thumb_pressed_holo</item>
        <item name="android:fastScrollPreviewBackgroundRight">@drawable/bg_default_focused_holo_light</item>
    </style>

</resources>

Setting scrollbar features when pressed fastscroll_thumb_holo.xml on the res / drawable path:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">

    <item android:drawable="@drawable/fastscroll_thumb_pressed_holo" android:state_pressed="true"/>
    <item android:drawable="@drawable/fastscroll_thumb_default_holo"/>

</selector>

Creating an adapter :

public class ListAdapter extends ArrayAdapter<String> implements SectionIndexer {

    HashMap<String, Integer> mapIndex;
    String[] sections;
    List<String> fruits;

    public ListAdapter(Context context, List<String> fruitList) {
        super(context, R.layout.list_item, fruitList);
        this.fruits = fruitList;
        mapIndex = new LinkedHashMap<String, Integer>();
        for (int x = 0; x < fruits.size(); x++) {
            String fruit = fruits.get(x);
            String ch = fruit.substring(0, 1);
            ch = ch.toUpperCase(Locale.US);
            mapIndex.put(ch, x);
         }
        Set<String> sectionLetters = mapIndex.keySet();
        ArrayList<String> sectionList = new ArrayList<String>(sectionLetters);
        Collections.sort(sectionList);
        sections = new String[sectionList.size()];
        sectionList.toArray(sections);
    }

    public int getPositionForSection(int section) {
        return mapIndex.get(sections[section]);
    }

    public int getSectionForPosition(int position) {
        return 0;
    }

    public Object[] getSections() {
        return sections;
    }
}

Finally, the MainActivity :

public class MainActivity extends ListActivity {

    ListView fruitView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        fruitView = (ListView) findViewById(android.R.id.list);
        fruitView.setFastScrollEnabled(true);
        String[] fruits = getResources().getStringArray(R.array.fruits_array);
        List<String> fruitList = Arrays.asList(fruits);
        Collections.sort(fruitList);
        setListAdapter(new ListAdapter(this, fruitList));
     }
}