Did you ever want to know how to place an element below a ScrollView which will normally fill the whole screen?
This is only possible by a little trick: Using margins.
The ScrollView must have positive layout_marginBottom, and the element below the ScrollView must have negative layout_marginTop.

Short example:

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<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_height="wrap_content" android:layout_width="fill_parent">
     <TextView android:id="@+id/TextView01" android:layout_height="wrap_content" android:layout_width="wrap_content" android:text="This text view should act as header  " />
     <ScrollView android:layout_marginBottom="50dip" android:id="@+id/ScrollView01" android:layout_height="wrap_content" android:layout_width="fill_parent">
          <RadioGroup android:id="@+id/RadioGroup01" android:layout_width="wrap_content" android:layout_height="wrap_content">
               <RadioButton android:id="@+id/RadioButton01" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton02" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />
               <RadioButton android:id="@+id/RadioButton11" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Radio Button....." />       
          </RadioGroup>
     </ScrollView>
     <RelativeLayout android:layout_marginTop="-50dip" android:gravity="bottom" android:layout_height="wrap_content" android:layout_width="fill_parent">
        <Button android:id="@+id/Button01" android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="A button that should always be at the bottom"/>
     </RelativeLayout>
</LinearLayout>

Take a closer look on line 6 and 24.

Portrait mode:
device-portrait

Landscape mode:
device-landscape

Post inspired by a problem posted on the anddev.org forum

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