its very simple... to add a vertical line in android xml...

<View
android:layout_width="fill_parent"
android:layout_height="1dp"
android:layout_marginTop="5dp"
android:rotation="90"
android:background="@android:color/darker_gray"/>

Depends,where you want to have the vertical line,but if you want a vertical border for example,you can have the parent view have a background a custom drawable. And you can then define the drawable like this:

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <shape
            android:shape="rectangle">
            <stroke android:width="1dp" android:color="#000000" />
            <solid android:color="#00ffffff" />

        </shape>
    </item>

    <item android:right="1dp">
        <shape android:shape="rectangle">
            <solid android:color="#00ffffff" />
        </shape>
    </item>

</layer-list>

This example will create a 1dp thin black line on the right side of the view,that will have this drawable as an background.

You can use a shape but instead of a line make it rectangle.

android:shape="rectangle">
<stroke
    android:width="5dp"
    android:color="#ff000000"
    android:dashGap="10px"
    android:dashWidth="30px" />

and In your layout use this...

<ImageView
    android:layout_width="7dp"
    android:layout_height="match_parent"
    android:src="@drawable/dashline"
    android:layout_alignParentTop="true"
    android:layout_centerHorizontal="true"
    android:layerType="software"/>

You might have to play with the width,depending on the size of the dashes,to get it into a single line.

Hope this helps Cheers

I created a RelativeLayout with a LinearLayout and a View as childs. The LinearLayout (I don't know if it can be a RelativeLayout as well) contains the Views as normal,and the View is the line.

Here's the code:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:layout_alignParentLeft="true">

        <-- Your views here -->

    </LinearLayout>

    <View
        android:layout_width="1dp"
        android:layout_height="fill_parent"
        android:background="#000000"
        android:layout_alignParentRight="true" />

</RelativeLayout>

Very simple and I think better approach.

<TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:text="Section Text"
            android:id="@+id/textView6"
            android:textColor="@color/emphasis"
            android:drawableBottom="@drawable/underline"/>

underline.xml

<?xml version="1.0" encoding="utf-8"?>
<shape
      xmlns:android="http://schemas.android.com/apk/res/android"
      android:shape="rectangle">
      <size android:width="1000dp" android:height="2dp" />
      <solid android:color="@color/emphasis"/>
</shape>