activity_sign_up.xml

<?xml version="1.0" encoding="utf-8"?>
<ScrollView 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"
    tools:context="com.example.taskboxx.SignUpActivity">
    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <TextView
            android:id="@+id/Explanation"
            android:textColor="#AA000000"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="25dp"
            android:layout_marginRight="25dp"
            android:layout_marginTop="25dp"
            android:text="Enter the following details to Sign up!\nOnly your Username will be made public." />

        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/SignUpName_textLayout"
            android:textColorHint="#000000"
            android:layout_below="@+id/Explanation"
            android:layout_marginTop="20dp"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            app:hintTextAppearance="@style/TextAppearance.TextInputLayout">
            <EditText android:id="@+id/input_Name_SignUp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginRight="30dp"
                android:layout_marginLeft="30dp"
                android:inputType="text"
                android:hint="Name" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:layout_width="270dp"
            android:layout_height="wrap_content"
            android:id="@+id/SignUpUsername_textLayout"
            android:textColorHint="#000000"
            android:layout_marginTop="20dp"
            android:layout_below="@+id/SignUpName_textLayout"
            android:layout_alignParentLeft="true"
            android:layout_alignParentStart="true"
            app:hintTextAppearance="@style/TextAppearance.TextInputLayout">
            <EditText android:id="@+id/input_Username_SignUp"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginRight="15dp"
                android:layout_marginLeft="30dp"
                android:inputType="text"
                android:hint="Username" />
        </android.support.design.widget.TextInputLayout>

        <android.support.design.widget.TextInputLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:id="@+id/SignUpAge_textLayout"
            android:textColorHint="#000000"
            android:layout_marginTop="20dp"
            android:layout_below="@+id/SignUpName_textLayout"
            android:layout_toEndOf="@+id/SignUpUsername_textLayout"