How to assign padding to Listview item divider line

Use ‘inset’…..

(list_divider.xml)

<?xml version="1.0" encoding="UTF-8"?>
<inset xmlns:android="http://schemas.android.com/apk/res/android"
    android:insetLeft="50dp"
    android:insetRight="50dp" >

 <shape>
    <solid android:color="@color/orange" />
    <corners android:radius="2.0dip" />
</shape>

</inset>

and in your list view add like this…

<ListView
    android:dividerHeight="2dp"
    android:divider="@drawable/list_divider"
    ...
/>

you can set the inset value as desired…

UPDATE

As pointed out by @Giulio Piancastelli , If the background of list container is different from background of list item then you may use ‘layer-list’…

(list_divider.xml)

  <?xml version="1.0" encoding="utf-8"?>
  <layer-list xmlns:android="http://schemas.android.com/apk/res/android" >  
   <item>
        <shape android:shape="rectangle" >
            <solid android:color="@color/list_background" />
        </shape>
    </item>


    <item
        android:left="10dp"
        android:right="10dp">
        <shape android:shape="rectangle" >
            <solid android:color="@color/divider_color"/>
        </shape>
    </item>

        </layer-list>

and in your list view add like this…

<ListView
    android:dividerHeight="2dp"
    android:divider="@drawable/list_divider"
    ...
/>