Android: creating two columns in a linearlayout

You should use android:layout_weight attribute. Here is an example:

<LinearLayout
    android:id="@+id/linearLayout2"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="Street" 
        android:layout_gravity="left"
        android:background="#88FF0000"/>

    <TextView
        android:id="@+id/textView2"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:text="456546546"
        android:layout_gravity="right" 
        android:background="#8800FF00"/>

</LinearLayout>