activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:background="@color/colorPrimary"

    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="com.speedyapps.keepyousafe.MainActivity">

    <TextView
        android:text="Keep You Safe!"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:id="@+id/keepYouSafeText"
        android:textSize="30sp"
        android:textStyle="normal|bold"
        android:textAlignment="center"
        android:textColor="#FFFFFF"
        android:layout_alignParentTop="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true" />

    <ImageButton
        app:srcCompat="@drawable/help"
        android:id="@+id/helpButton"
        android:scaleType="fitXY"
        android:layout_width="350dp"
        android:layout_height="350dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentEnd="true"
        android:layout_marginBottom="37dp"
        android:onClick="onClick" />

</RelativeLayout>