Why my element is not staying at the bottom as supposed?

I have this layout xml file:

<ScrollView xmlns:android="http://ift.tt/nIICcg"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:fillViewport="true">

    <RelativeLayout xmlns:android="http://ift.tt/nIICcg"
        xmlns:tools="http://ift.tt/LrGmb4"
        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=".MainActivity">

        <TextView
            android:layout_marginTop="40dp"
            android:id="@+id/emalLbl"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerHorizontal="true"
            android:text="@string/test" />

        <LinearLayout xmlns:android="http://ift.tt/nIICcg"
            android:id="@+id/testTxtLay"
            android:layout_marginTop="10dp"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/emalLbl"
            android:orientation="horizontal"
            android:padding="10dp"
            android:weightSum="1">

            <EditText
                android:id="@+id/testTxt"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1.0"
                android:background="@drawable/edit_text_design" />
        </LinearLayout>

        <TextView
            android:layout_marginTop="60dp"
            android:id="@+id/reminderLbl"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_below="@id/testTxtLay"
            android:layout_centerHorizontal="true"
            android:text="@string/reminder" />

        <LinearLayout xmlns:android="http://ift.tt/nIICcg"
            android:layout_marginTop="10dp"
            android:id="@+id/reminderTxtLay"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_below="@id/reminderLbl"
            android:orientation="horizontal"
            android:padding="10dp"
            android:weightSum="1">

            <EditText
                android:id="@+id/reminderTxt"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                android:layout_weight="1.0"
                android:lines="2"
                android:background="@drawable/edit_text_design" />
        </LinearLayout>

        <View
            android:id="@+id/spacer"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_below="@id/reminderTxtLay"
            android:layout_centerHorizontal="true" />

        <Button
            android:layout_marginTop="200dp"
            android:id="@+id/pickDateBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignParentLeft="true"
            android:layout_below="@id/reminderTxtLay"
            android:layout_toLeftOf="@+id/spacer"
            android:onClick="showDatePickerDialog"
            android:text="@string/datePickerBtnTxt" />

        <Button
            android:id="@+id/pickTimeBtn"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@id/pickDateBtn"
            android:layout_alignParentRight="true"
            android:layout_toRightOf="@+id/pickDateBtn"
            android:onClick="showTimePickerDialog"
            android:text="@string/pickTimeBtn" />

        <View
            android:id="@+id/spacerTxt"
            android:layout_width="0dp"
            android:layout_height="0dp"
            android:layout_below="@id/reminderTxtLay"
            android:layout_centerHorizontal="true" />

        <EditText
            android:layout_marginTop="15dp"
            android:id="@+id/selectedDate"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@id/spacerTxt"
            android:layout_below="@id/pickDateBtn"
            android:layout_toLeftOf="@+id/spacerTxt" />

        <EditText
            android:id="@+id/selectedTime"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_alignBaseline="@id/selectedDate"
            android:layout_below="@id/pickTimeBtn"
            android:layout_toRightOf="@+id/selectedDate" />

        <Button
            android:id="@+id/submitBtn"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="true"
            android:layout_centerInParent="true"
            android:onClick="submitData"
            android:text="@string/submitBtn" />

    </RelativeLayout>
</ScrollView>

This is the custom design for 7 inch tablets, placed in res\layout-sw600dp

Anyways in the android studio landscape preview it seems just fine:

But in the emulator something is going wrong and here is how it looks strange. What I mean is that the submit button is not on the bottom and the pickDate and pickTime buttons are at the bottom of the layout.

I know that I'm missing a basic point here, but as an android developer, I'm not able to spot it.

Can you give me a push?