Android RelativeLayout align concern

Question

I'm playing with android layouts and trying to make a simple QA test, but I can't get the layout right. I just have no idea how to align those things and after few hours of fight I need little help.

Here is what I want:

And what I get:

Here is my XML:

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

<ScrollView
    android:id="@+id/scrollView"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fillViewport="true" >

    <RelativeLayout
        android:id="@+id/nodeLayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent" >

        <TextView
            android:id="@+id/textQuestion"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:text="TextView"
            android:textSize="18dp" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:orientation="vertical" >

            <RadioGroup
                android:id="@+id/radioAnswersGroup"
                android:layout_width="match_parent"
                android:layout_height="wrap_content" >
            </RadioGroup>

            <LinearLayout
                android:id="@+id/questionsNavigationGroup"
                android:layout_width="match_parent"
                android:layout_height="50dp"
                android:orientation="horizontal" >

                <Button
                    android:id="@+id/buttonPreviousQuestion"
                    android:layout_width="match_parent"
                    android:layout_height="45dp"
                    android:layout_weight="1"
                    android:background="@drawable/fancy_button"
                    android:gravity="center|center_vertical"
                    android:onClick="onPreviousQuestionButtonClick"
                    android:shadowColor="#fff"
                    android:shadowRadius="3"
                    android:text="Back"
                    android:textColor="#432f11"
                    android:textSize="24dp" />

                <Button
                    android:id="@+id/buttonNextQuestion"
                    android:layout_width="match_parent"
                    android:layout_height="45dp"
                    android:layout_weight="1"
                    android:background="@drawable/fancy_button"
                    android:gravity="center|center_vertical"
                    android:onClick="onNextQuestionButtonClick"
                    android:shadowColor="#fff"
                    android:shadowRadius="3"
                    android:text="Next"
                    android:textColor="#432f11"
                    android:textSize="24dp" />

                <Spinner
                    android:id="@+id/spinner"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="1" />
            </LinearLayout>

        </LinearLayout>

    </RelativeLayout>

</ScrollView>

</LinearLayout>

Answers and buttons should be always on bottom, and question should be always on top. But when text is long, the view should stretch inside scroll view.

EDIT:

I found the way without relative layout. I don't know if this is a bug or feature but this layout scales like I want.

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:fillViewport="true" >

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textQuestion"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="top" />

    <LinearLayout
        android:id="@+id/bottomStuff"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:gravity="bottom"
        android:orientation="vertical" >

        <RadioGroup
            android:id="@+id/radioAnswersGroup"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" >
        </RadioGroup>

        <LinearLayout
            android:id="@+id/questionsNavigationGroup"
            android:layout_width="match_parent"
            android:layout_height="50dp"
            android:orientation="horizontal" >

            <Button
                android:id="@+id/buttonPreviousQuestion"
                android:layout_width="match_parent"
                android:layout_height="45dp"
                android:layout_weight="1" />

            <Button
                android:id="@+id/buttonNextQuestion"
                android:layout_width="match_parent"
                android:layout_height="45dp"
                android:layout_weight="1" />

            <Spinner
                android:id="@+id/spinner"
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1" />

        </LinearLayout>

    </LinearLayout>

</LinearLayout>

</ScrollView>

Answer 1

I think you should use this:

<ScrollView
android:id="@+id/scrollView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:fillViewport="true" >