[android help] How do I add a 1dp line to the bottom of my textview cell ( not a table layout)

I am new to android, jsut a very plain simple question, how do i add a bottom line to a text view, so that it appears at the bottom of the cell as 1dp, here's the code so far:

        android:layout_width="match_parent"
        android:layout_height="47.5dp"
        android:layout_marginLeft="2dp"
        android:layout_marginRight="2dp"
        android:paddingTop="13dp"
        android:background="@drawable/line_str"
        android:paddingLeft="8dp"
        android:text="@string/manage_categories"
        android:singleLine="true"
        android:textColor="@color/white"
        android:fontFamily="Roboto-Regular"
        android:layout_gravity="center"
        android:textSize="16sp"
        />

line_str.xml as follows:

Any help appreciated. Thanks!Justin

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