KdanLoginRegisterUI/src/main/res/layout/activity_register_a.xml

<?xml version="1.0" encoding="utf-8"?>
<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"
    tools:context=".screen.RegisterAActivity">

    <ScrollView
        android:fillViewport="true"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        >

        <android.support.constraint.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <android.support.constraint.Guideline
                android:id="@+id/guideLine_registerA_centerHorizontal"
                android:orientation="vertical"
                android:layout_width="0dp"
                android:layout_height="0dp"
                app:layout_constraintGuide_percent="0.5"
                />

            <android.widget.Space
                android:id="@+id/anchor_registerA_left"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginRight="136dp"
                android:layout_marginEnd="136dp"
                app:layout_constraintRight_toRightOf="@id/guideLine_registerA_centerHorizontal"
                />

            <android.widget.Space
                android:id="@+id/anchor_registerA_right"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginLeft="136dp"
                android:layout_marginStart="136dp"
                app:layout_constraintLeft_toLeftOf="@id/guideLine_registerA_centerHorizontal"
                />

            <ImageButton
                android:id="@+id/btn_registerA_close"
                android:background="?android:attr/selectableItemBackground"
                android:src="@drawable/ic_close_blue_24dp"
                android:contentDescription="@string/emptyImageContextDescription"
                android:layout_width="36dp"
                android:layout_height="36dp"
                android:layout_marginTop="16dp"
                android:layout_marginLeft="15dp"
                android:layout_marginStart="15dp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                />

            <ImageView
                android:id="@+id/iv_registerA_kdanCloud"
                android:src="@drawable/kdancloud"
                android:scaleType="centerCrop"
                android:contentDescription="@string/emptyImageContextDescription"
                android:layout_width="116dp"
                android:layout_height="77dp"
                android:layout_marginTop="48dp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toTopOf="@+id/emailRegisterFromView_registerA"
                app:layout_constraintVertical_chainStyle="packed"
                />

            <com.kdanmobile.kdanloginregisterui.widget.EmailRegisterFormView
                android:id="@+id/emailRegisterFromView_registerA"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="36dp"
                app:layout_constraintLeft_toLeftOf="@id/anchor_registerA_left"
                app:layout_constraintRight_toRightOf="@id/anchor_registerA_right"
                app:layout_constraintTop_toBottomOf="@id/iv_registerA_kdanCloud"
                app:layout_constraintBottom_toTopOf="@+id/tv_registerA_orDivider"
                />

            <TextView
                android:id="@+id/tv_registerA_orDivider"
                android:text="@string/or"
                android:textSize="@dimen/or_divider_text_size"
                android:textColor="@color/or_diver"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                app:layout_constraintTop_toBottomOf="@id/emailRegisterFromView_registerA"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintBottom_toTopOf="@+id/view_registerA_fbRegister"
                />

            <View
                android:background="@color/or_diver"
                android:layout_width="0dp"
                android:layout_height="1dp"
                android:layout_marginRight="16dp"
                android:layout_marginEnd="16dp"
                app:layout_constraintTop_toTopOf="@id/tv_registerA_orDivider"
                app:layout_constraintBottom_toBottomOf="@id/tv_registerA_orDivider"
                app:layout_constraintLeft_toLeftOf="@id/anchor_registerA_left"
                app:layout_constraintRight_toLeftOf="@id/tv_registerA_orDivider"
                />

            <View
                android:background="@color/or_diver"
                android:layout_width="0dp"
                android:layout_height="1dp"
                android:layout_marginLeft="16dp"
                android:layout_marginStart="16dp"
                app:layout_constraintTop_toTopOf="@id/tv_registerA_orDivider"
                app:layout_constraintBottom_toBottomOf="@id/tv_registerA_orDivider"
                app:layout_constraintLeft_toRightOf="@id/tv_registerA_orDivider"
                app:layout_constraintRight_toRightOf="@id/anchor_registerA_right"
                />

            <com.kdanmobile.kdanloginregisterui.widget.btn.FacebookRegisterBtn
                android:id="@+id/view_registerA_fbRegister"
                android:layout_width="0dp"
                android:layout_height="@dimen/login_register_btn_height"
                android:layout_marginTop="16dp"
                app:layout_constraintTop_toBottomOf="@id/tv_registerA_orDivider"
                app:layout_constraintLeft_toLeftOf="@id/anchor_registerA_left"
                app:layout_constraintRight_toRightOf="@id/anchor_registerA_right"
                app:layout_constraintBottom_toTopOf="@+id/view_registerA_googleRegister"
                />

            <com.kdanmobile.kdanloginregisterui.widget.btn.GoogleRegisterBtn
                android:id="@+id/view_registerA_googleRegister"
                android:layout_width="0dp"
                android:layout_height="@dimen/login_register_btn_height"
                android:layout_marginTop="8dp"
                app:layout_constraintTop_toBottomOf="@id/view_registerA_fbRegister"
                app:layout_constraintLeft_toLeftOf="@id/anchor_registerA_left"
                app:layout_constraintRight_toRightOf="@id/anchor_registerA_right"
                app:layout_constraintBottom_toTopOf="@+id/tv_registerA_switchToLogin"
                />

            <TextView
                android:id="@+id/tv_registerA_switchToLogin"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="32dp"
                android:text="@string/switch_to_login"
                android:textColor="@color/switch_text"
                android:gravity="center"
                app:layout_constraintBottom_toTopOf="@+id/tv_registerA_tosAndPp"
                app:layout_constraintLeft_toLeftOf="@id/anchor_registerA_left"
                app:layout_constraintRight_toRightOf="@id/anchor_registerA_right"
                app:layout_constraintTop_toBottomOf="@id/view_registerA_googleRegister" />

            <TextView
                android:id="@+id/tv_registerA_tosAndPp"
                tools:text="Our terms of service and privacy policy."
                android:textSize="@dimen/tos_and_pp_text_size"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_marginTop="32dp"
                android:layout_marginBottom="20dp"
                android:gravity="center"
                app:layout_constraintLeft_toLeftOf="@id/anchor_registerA_left"
                app:layout_constraintRight_toRightOf="@id/anchor_registerA_right"
                app:layout_constraintTop_toBottomOf="@id/tv_registerA_switchToLogin"
                app:layout_constraintBottom_toBottomOf="parent"
                />
        </android.support.constraint.ConstraintLayout>
    </ScrollView>

</android.support.constraint.ConstraintLayout>