how to Add scroll view in to the android layout?

Question

    <?xml version="1.0" encoding="utf-8"?>
    <ScrollView 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:fillViewport="true">

    <RelativeLayout
    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.yadapras.mobiltyemp.EmpDetail">

    <EditText
        android:id="@+id/emp_username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/reg_name"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="50dp"/>
    <EditText
        android:id="@+id/emp_full_name"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/reg_fullname"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="5dp"
        android:layout_below="@+id/emp_username"/>

    <EditText
        android:id="@+id/user_pass"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/reg_password"
        android:layout_marginLeft="15dp"
        android:layout_marginRight="15dp"
        android:layout_marginTop="5dp"
        android:layout_below="@+id/emp_full_name"/>


    <!-- Contact Detail -->
    <LinearLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
    android:layout_gravity="bottom"
    android:orientation="vertical"
    android:paddingLeft="20dp"
    android:paddingRight="20dp"
        android:layout_marginBottom="60dp">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Contact Detail"
        android:layout_gravity="center"
        android:textAppearance="?android:textAppearanceLarge" />

        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="Email id"
            android:layout_marginTop="10dp"/>
        <EditText
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:hint="Contact No"
            android:layout_marginTop="10dp"/>



    </LinearLayout>
    </RelativeLayout>

</ScrollView>

I am new to android development, i am trying to add a scroll view in to the relative layout, everything was fine before adding a scroll view ,after adding a scroll view all of my relatively widgets misplacing and i try many solutions but it's not working for me. I am attaching screen shot of output.

output is Without any action

output with after clicking on edit text

Answer 1

Updated Code . Its working for me :) 

    <?xml version="1.0" encoding="utf-8"?>
    <ScrollView
        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:fillViewport="true">

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


        <EditText
            android:id="@+id/emp_username"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/reg_name"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="50dp"/>
        <EditText
            android:id="@+id/emp_full_name"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/reg_fullname"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="5dp"
            android:layout_below="@+id/emp_username"/>

        <EditText
            android:id="@+id/user_pass"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:hint="@string/reg_password"
            android:layout_marginLeft="15dp"
            android:layout_marginRight="15dp"
            android:layout_marginTop="5dp"
            android:layout_below="@+id/emp_full_name"/>


        <!-- Contact Detail -->
        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="vertical"
            android:gravity="bottom">

        <TextView
            android:id="@+id/contact"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="Contact Detail"
            android:layout_gravity="center"
            android:textAppearance="?android:textAppearanceLarge" />

            <EditText
                android:id="@+id/email"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Email id"
                android:layout_below="@+id/contact"
                android:layout_marginTop="10dp"
                android:layout_marginLeft="15dp"
                android:layout_marginRight="15dp"/>
            <EditText
                android:layout_below="@+id/email"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:hint="Contact No"
                android:layout_marginTop="10dp"
                android:layout_marginLeft="15dp"
                android:layout_marginRight="15dp"
                android:layout_alignParentBottom="true"/>

        </LinearLayout>

    </LinearLayout>
        </ScrollView>

`