Android ScrollView and buttons at bottom of the screen

Just created and tested it. Looks like you want.

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

    <LinearLayout
            android:id="@+id/buttons"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="horizontal"
            android:gravity="center"
            android:layout_alignParentBottom="true">
        <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Custom Button1"/>
        <Button
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="Custom Button2"/>
    </LinearLayout>

    <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_above="@id/buttons">
         <!--Scrollable content here-->
        <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="vertical">                
            <TextView
                    android:layout_height="wrap_content"
                    android:layout_width="wrap_content"
                    android:text="test text"
                    android:textSize="40dp"/>
        </LinearLayout>
    </ScrollView>

</RelativeLayout>

scrollview cannot fit the screen because you put it on a linear layout, so linear layout fit in the screen,

just try to make scrollview as root elemen on xml layout

<?xml version="1.0" encoding="utf-8"?>
<ScrollView
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/scrollView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >
        <!-- Here you can put some XML stuff and BOOM! your screen fit to scrollview -->

    </LinearLayout>
</ScrollView>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:layout_weight="1">
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">
            <TextView 
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="Hello World"
            />
            <TextView 
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
             android:text="Hallo Welt"
            />       
        </LinearLayout>
    </ScrollView>
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="0">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Go next page"
            android:layout_alignParentRight="true" />
    </RelativeLayout>

</LinearLayout>

This worked for me. Give the scroll view a weight of 1. Put all the other widgets following the scroll view in a layout. The scroll view will grow enough to not block the rest.

Widgets in scroll view and rest at bottom