Android ScrollView adds extra padding on top and bottom of child imageview

Question

I have a problem with rendering a ScrollView. Essentially, the layout is fixed header and footer with a scrollview in the middle. The idea is that when the screen keyboard is activated for the content EditText the image can be scrolled if the height of the image is longer than the middle view.

In testing the layout, I've found that on my Android phone (Xperia X10 Android 1.6) there is a whole heap of padding added to the top and bottom of the ImageView.

I'd appreciate any suggestions as to how I can prevent this from happening.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <!-- Header -->
    <RelativeLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#FFFFFF">
        <TextView
            android:text="Share your photo"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="left"/>
        <Button
            android:id="@+id/btnStack"
            android:text="Stacks"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentRight="true"/>
    </RelativeLayout>
    <!-- End Header -->


    <!-- Body -->
    <ScrollView
        android:orientation="vertical"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:padding="5px"
        android:background="#CCCCCC">
        <ImageView
            android:id="@+id/imgPreview"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"/>
    </ScrollView>
    <!-- End Body -->


    <!-- Footer -->
    <RelativeLayout
        android:orientation="horizontal"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:background="#FFFFFF"
        android:layout_alignParentBottom="true">
        <EditText
            android:id="@+id/caption"
            android:text="Type your caption"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"/>

        <LinearLayout
            android:orientation="horizontal"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/caption"
            android:background="#CCCCCC">
            <Button
                android:id="@+id/btnUpload"
                android:text="Share"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"/>
            <Button
                android:id="@+id/btnCancel"
                android:text="Cancel"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:layout_weight="1"/>
        </LinearLayout>

    </RelativeLayout>
    <!-- End Footer -->

</LinearLayout>

Answer 1

I found after some experimentation that adding the following syntax to my java code solved the problem:

    imgPreview.setScaleType(ImageView.ScaleType.CENTER_INSIDE);
    imgPreview.setAdjustViewBounds(true);