Samples/Push/push/src/main/res/layout/activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:background="@color/colorPrimary">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/usergridGuy"
        android:minWidth="175dp"
        android:minHeight="175dp"
        android:maxHeight="175dp"
        android:maxWidth="175dp"
        android:clickable="false"
        android:src="@drawable/usergridguy"
        android:layout_centerVertical="true"
        android:layout_alignStart="@+id/pushToAllDevices" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Push To All Devices"
        android:id="@+id/pushToAllDevices"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:minHeight="175dp"
        android:maxWidth="175dp"
        android:minWidth="175dp"
        android:maxHeight="175dp"
        android:background="#95b8cb"
        android:textColor="#ffffff"
        android:textSize="10dp"
        android:clickable="true" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Push To This Device"
        android:id="@+id/pushToThisDevice"
        android:minHeight="175dp"
        android:maxWidth="175dp"
        android:minWidth="175dp"
        android:maxHeight="175dp"
        android:background="#95b8cb"
        android:textColor="@color/background_floating_material_light"
        android:textSize="10dp"
        android:layout_alignParentTop="true"
        android:layout_alignStart="@+id/usergridGuy"
        android:clickable="true" />

    <ImageButton
        android:layout_width="30dp"
        android:layout_height="30dp"
        android:id="@+id/infoButton"
        android:src="@drawable/info"
        android:background="@null"
        android:layout_alignParentBottom="true"
        android:layout_alignParentEnd="true"
        android:adjustViewBounds="true"
        android:scaleType="centerCrop" />

</RelativeLayout>