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="com.example.wesley.onepointfourmillion.MainActivity">

    <Button
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text="TAP ME"
        android:id="@+id/button"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true"
        android:background="#0000"/>

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView1"
        android:layout_below="@+id/button"
        android:layout_centerHorizontal="true"
        android:src="@drawable/lhand"
        android:visibility="gone"/>

    <ImageView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:id="@+id/imageView2"
        android:layout_below="@+id/button"
        android:layout_centerHorizontal="true"
        android:src="@drawable/rhand"
        android:visibility="gone"/>
</RelativeLayout>