How to center a RatingBar in Android

I have created a custom RatingBar as described in one of the tutorials given here on stack-overflow and it's looking great, the problem is with the centering of the image. here is what I've got:

As you can see the TextView is centered vertically in the LinearLayout, but the RatingBar is at the top of it. Here is my xml code of this image:

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrollView1"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:foregroundGravity="center" >

    <LinearLayout
        android:layout_width="320dp"
        android:layout_height="match_parent"
        android:gravity="center" >

        <TextView
            android:id="@+id/textView1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="TextView" />

        <RatingBar
            android:id="@+id/ratingBar1"
            style="@style/starsRatingBar"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:numStars="5"
            android:rating="2.3"
            android:stepSize="1" />

        <ImageView
            android:id="@+id/imageView1"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:src="@drawable/ic_launcher" />

    </LinearLayout>

</ScrollView>

Here is the code of the styling:

<style name="starsRatingBar" parent="@android:style/Widget.RatingBar">
        <item name="android:progressDrawable">@drawable/star_ratingbar_full</item>
        <item name="android:minHeight">36dip</item>
        <item name="android:maxHeight">36dip</item>
    </style>

Any ideas in the RatingBar would be apprisiated!

THANKS

Ok, I think I've got it.

The key issue is the ScrollView: it automatically makes things compact, unless you specifically tell it otherwise. In the scroll view, set

android:fillViewport="true"

to make it use the space available.