app/src/main/res/layout/activity_main.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"
android:background="@color/red"
android:paddingBottom="16dp"
android:paddingLeft="16dp"
android:paddingRight="16dp"
android:paddingTop="16dp"
tools:context=".MainActivity">
<com.google.android.gms.common.SignInButton
android:id="@+id/googleButton"
android:layout_width="113dp"
android:layout_height="49dp"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:layout_marginBottom="120dp"
android:layout_marginEnd="127dp"
android:layout_marginStart="128dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"/>
<ImageView
android:id="@+id/imageView"
android:layout_width="220dp"
android:layout_height="231dp"
android:layout_above="@+id/googleButton"
android:layout_centerHorizontal="true"
android:layout_marginBottom="14dp"
android:layout_marginEnd="74dp"
android:layout_marginStart="74dp"
android:layout_marginTop="65dp"
android:contentDescription="@string/radius_logo"
app:layout_constraintBottom_toTopOf="@+id/googleButton"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="@mipmap/ic_launcher_foreground" />
</android.support.constraint.ConstraintLayout>