Q:

ConstraintLayout within scrollview

I am looking to build a UI where I would like to show the scroll on landscape orientation and keep the button to the very bottom of the screen and stick to the footer but there should be fair gap between to scroll during landscape view.
Any help is greatly appreciated.
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<android.support.constraint.Guideline
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:id="@+id/guideline40PercentVertical"
    android:orientation="vertical"
    app:layout_constraintGuide_percent="0.35" />

<TextView
    android:id="@+id/tvPageHeader"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_marginTop="30dp"
    android:text="Your detail"
    android:textAlignment="center"
    android:textSize="25sp"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent" />

<TextView
    android:id="@+id/tvLabelName"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="name"
    android:textAlignment="viewEnd"
    app:layout_constraintRight_toLeftOf="@+id/guideline40PercentVertical"
    android:layout_marginRight="10dp"
    android:layout_marginTop="62dp"
    app:layout_constraintTop_toBottomOf="@+id/tvPageHeader" />

<TextView
    android:id="@+id/tvName"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    tools:text="Mr. Ian Citizen"
    android:layout_marginLeft="10dp"
    app:layout_constraintLeft_toLeftOf="@+id/guideline40PercentVertical"
    app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelName" />

<TextView
    android:id="@+id/tvLabelMobile"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="mobile"
    android:layout_marginRight="2dp"
    app:layout_constraintRight_toRightOf="@+id/tvLabelName"
    android:layout_marginTop="10dp"
    app:layout_constraintTop_toBottomOf="@+id/tvLabelName" />

<TextView
    android:id="@+id/tvMobile"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:text="189232323"
    android:layout_marginLeft="0dp"
    app:layout_constraintLeft_toLeftOf="@+id/tvName"
    app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelMobile" />

<TextView
    android:id="@+id/tvLabelEmail"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="email"
    android:layout_marginRight="2dp"
    app:layout_constraintRight_toRightOf="@+id/tvLabelMobile"
    android:layout_marginTop="10dp"
    app:layout_constraintTop_toBottomOf="@+id/tvLabelMobile" />

<TextView
    android:id="@+id/tvEmail"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:text="Ian.citizen@app.com"
    android:layout_marginLeft="0dp"
    app:layout_constraintLeft_toLeftOf="@+id/tvMobile"
    app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelEmail" />

<TextView
    android:id="@+id/tvLabelResidential"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="residential"
    android:layout_marginRight="2dp"
    app:layout_constraintRight_toRightOf="@+id/tvLabelEmail"
    android:layout_marginTop="10dp"
    app:layout_constraintTop_toBottomOf="@+id/tvLabelEmail" />

<TextView
    android:id="@+id/tvResidential"
    android:maxLines="2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:text="11 Frozan St, Brookvale 01-1000"
    android:layout_marginLeft="0dp"
    app:layout_constraintLeft_toLeftOf="@+id/tvEmail"
    app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelResidential" />

<TextView
    android:id="@+id/tvLabelPostal"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="postal"
    android:layout_marginRight="2dp"
    app:layout_constraintRight_toRightOf="@+id/tvLabelResidential"
    android:layout_marginTop="10dp"
    app:layout_constraintTop_toBottomOf="@+id/tvLabelResidential" />

<TextView
    android:id="@+id/tvPostal"
    android:maxLines="2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    tools:text="1 Rozan St, Brookvale 01-1000"
    android:layout_marginLeft="0dp"
    app:layout_constraintLeft_toLeftOf="@+id/tvResidential"
    app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelPostal" />

<Button
    android:id="@+id/btnDone"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginBottom="0dp"
    android:layout_marginLeft="0dp"
    android:layout_marginRight="0dp"
    android:text="@string/controller_origination_review_personal_detail_button_done"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" />

[

A:

i think you should change your code like this:
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ScrollView
    android:layout_width="0dp"
    android:layout_height="0dp"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    app:layout_constraintTop_toTopOf="parent"
    android:layout_marginBottom="0dp"
    app:layout_constraintBottom_toTopOf="@+id/btnDone">

    <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <android.support.constraint.Guideline
            android:id="@+id/guideline40PercentVertical"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            app:layout_constraintGuide_percent="0.35"
            tools:layout_editor_absoluteX="137dp"
            tools:layout_editor_absoluteY="62dp" />

        <TextView
            android:id="@+id/tvPageHeader"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginTop="30dp"
            android:text="Your detail"
            android:textAlignment="center"
            android:textSize="25sp"
            app:layout_constraintHorizontal_bias="0.0"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <TextView
            android:id="@+id/tvLabelName"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginEnd="10dp"
            android:layout_marginRight="10dp"
            android:layout_marginTop="62dp"
            android:text="name"
            android:textAlignment="viewEnd"
            app:layout_constraintRight_toLeftOf="@+id/guideline40PercentVertical"
            app:layout_constraintTop_toBottomOf="@+id/tvPageHeader" />

        <TextView
            android:id="@+id/tvName"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginLeft="10dp"
            android:layout_marginStart="10dp"
            app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelName"
            app:layout_constraintLeft_toLeftOf="@+id/guideline40PercentVertical"
            tools:text="Mr. Ian Citizen" />

        <TextView
            android:id="@+id/tvLabelMobile"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="2dp"
            android:layout_marginRight="2dp"
            android:layout_marginTop="10dp"
            android:text="mobile"
            app:layout_constraintRight_toRightOf="@+id/tvLabelName"
            app:layout_constraintTop_toBottomOf="@+id/tvLabelName" />

        <TextView
            android:id="@+id/tvMobile"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelMobile"
            app:layout_constraintLeft_toLeftOf="@+id/tvName"
            tools:text="189232323" />

        <TextView
            android:id="@+id/tvLabelEmail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="2dp"
            android:layout_marginRight="2dp"
            android:layout_marginTop="10dp"
            android:text="email"
            app:layout_constraintRight_toRightOf="@+id/tvLabelMobile"
            app:layout_constraintTop_toBottomOf="@+id/tvLabelMobile" />

        <TextView
            android:id="@+id/tvEmail"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelEmail"
            app:layout_constraintLeft_toLeftOf="@+id/tvMobile"
            tools:text="Ian.citizen@app.com" />

        <TextView
            android:id="@+id/tvLabelResidential"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="2dp"
            android:layout_marginRight="2dp"
            android:layout_marginTop="10dp"
            android:text="residential"
            app:layout_constraintRight_toRightOf="@+id/tvLabelEmail"
            app:layout_constraintTop_toBottomOf="@+id/tvLabelEmail" />

        <TextView
            android:id="@+id/tvResidential"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:maxLines="2"
            app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelResidential"
            app:layout_constraintLeft_toLeftOf="@+id/tvEmail"
            tools:text="11 Frozan St, Brookvale 01-1000" />

        <TextView
            android:id="@+id/tvLabelPostal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginEnd="2dp"
            android:layout_marginRight="2dp"
            android:layout_marginTop="10dp"
            android:text="postal"
            app:layout_constraintRight_toRightOf="@+id/tvLabelResidential"
            app:layout_constraintTop_toBottomOf="@+id/tvLabelResidential" />

        <TextView
            android:id="@+id/tvPostal"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:maxLines="2"
            app:layout_constraintBaseline_toBaselineOf="@+id/tvLabelPostal"
            app:layout_constraintLeft_toLeftOf="@+id/tvResidential"
            tools:text="1 Rozan St, Brookvale 01-1000" />
    </android.support.constraint.ConstraintLayout>
</ScrollView>

<Button
    android:id="@+id/btnDone"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:text="_button_done"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintHorizontal_bias="0.0"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent" /></android.support.constraint.ConstraintLayout>

