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:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.darshanbshah.odsystem.MainActivity">

    <Button
        android:text="Sign Out"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/sign_out_button"
        android:onClick="signOut"
        style="@style/Widget.AppCompat.Button.Borderless"
        android:textColor="@color/colorAccent"
        android:layout_alignParentTop="true"
        android:layout_alignParentEnd="true" />

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/welcomeText"
        android:textAppearance="@style/TextAppearance.AppCompat.Display1"
        android:layout_alignParentBottom="true"
        android:layout_alignParentStart="true"
        android:textSize="12sp"
        android:textAlignment="center" />

    <TextView
        android:text="Apply OD"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_marginTop="14dp"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:id="@+id/textView2"
        android:textSize="30sp"
        android:textAllCaps="false" />

    <ScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginLeft="@dimen/activity_horizontal_margin"
        android:layout_marginRight="@dimen/activity_horizontal_margin"
        android:layout_below="@+id/sign_out_button"
        android:layout_centerHorizontal="true">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical">


            <EditText
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:inputType="textPersonName"
                android:ems="10"
                android:id="@+id/reasonEditText"
                android:layout_alignParentBottom="true"
                android:layout_alignParentStart="true"
                android:layout_marginTop="@dimen/activity_vertical_margin"
                android:hint="Reason"
                android:textAlignment="center" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="horizontal"