When I type into the EditText box, the RelativeLayout containing it does not expand. The problem is I want it to.
Here's a visual display of the problem:

There's about 5 lines of gibberish typed in there and you can see the 2nd to last line cut off. Up to a maximum of 5 lines should be showing, but they're not, most likely because they're inside a layout whose height is set to wrap the contents. How can I make the parent layout expand when the EditText expands?
Here is the problem xml displaying the message box you see in the picture:
<RelativeLayout
    android:id="@+id/group_chat_form"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_marginTop="5dp"
    android:background="@drawable/transparent_background2" >
         <TextView 
        android:id="@+id/send_msg_button"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:background="@drawable/transparent_background2"
        android:text="Send" />
    <EditText
        android:id="@+id/group_chat_input_box"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignBottom="@id/send_msg_button"
        android:layout_toLeftOf="@id/send_msg_button"
        android:background="#00000000"
        android:hint="Type a message..."
        android:textColorHint="#EEEEEE"
        android:inputType="textMultiLine"
        android:maxLines="5"
        android:paddingLeft="5dp"
        android:paddingRight="5dp"
        android:paddingTop="4dp"
        android:paddingBottom="4dp"
        android:textColor="#FFFFFF"
        android:textSize="20sp"
        android:shadowColor="#000000"
        android:shadowRadius="3"
        android:shadowDx="3"
        android:shadowDy="3"/> 
  </RelativeLayout>
 
    