How to center image vertically in this RelativeLayout

Question

I have below layout which basically show "messages" as bubble slimier to built-in "Messages". I just need to show also an arrow image on the right, th eimage is shown, but I need it to be centered vertically. I tried to add " android:gravity="center_vertical" to image, but it had no effect.

any clue?

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content" >
    <LinearLayout 
        android:id="@+id/wrapper"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" 
        android:background="#00DBE2ED" >

        <RelativeLayout
            android:id="@+id/wrapper2"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:background="#00DBE2ED" >

            <EditText
                android:id="@+id/comment"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:editable="false" 
                android:layout_marginTop="5dip"
                android:layout_marginRight="5dip"
                android:layout_marginLeft="5dip"
                android:background="@drawable/bubble_yellow"
                android:paddingLeft="10dip"
                android:text="Hello bubbles!"
                android:textColor="@android:color/primary_text_light" />
            <TextView
                android:id="@+id/sender"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_margin="0dip"
                android:paddingLeft="5dip"
                android:paddingRight="2dip"
                android:text="Hello bubbles!"
                android:textColor="#b9dcdcdc"
                android:textSize="11sp"    
                android:layout_below="@+id/comment" />
            <ImageView
                android:id="@+id/aquaplayicon"
                android:src="@drawable/aquaplayicon"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:clickable="true"
                android:onClick="onClickGirl"
                android:layout_alignParentRight="true"
                android:paddingRight="3dip"
                android:gravity="center_vertical" />

        </RelativeLayout>


    </LinearLayout>


</LinearLayout>

Answer 1

The gravity attribute is not for the layout, since that is a LinearLayout attribute, and your ImageView is inside your RelativeLayout. Instead, remove the line

android:gravity="center_vertical"

and add the line

android:layout_centerVertical="true"

Answer 2

The attribute you are looking for is android:layout_centerVertical="true"