how to change color of the actual scroll in ScrollView android?

Create a scroll bar in drawable(scrollbar.xml) using this

<shape android:shape="rectangle"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
         android:angle="45"
         android:centerColor="#65FF8215"
         android:endColor="#87FD2125"
         android:startColor="#65FF8215" />
    <corners android:radius="20dp" />
</shape>

and add this scroll bar like android:scrollbarThumbVertical="@drawable/scrollbar" to your ListView

OR

put the following attribute to your layout

android:scrollbarThumbVertical="@android:color/white"

OR

create a image and put it in drawable. then add the following property to your layout

android:scrollbarThumbVertical="@drawable/scroll_bar_vertical"