How to make Button overlap CardView at the bottom

Question

I am creating an app that displays announcements, and I want to add a login. I am trying to make this XML design,

Answer 1

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    <LinearLayout android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:orientation="vertical">
        <LinearLayout android:layout_width="match_parent"
                    android:layout_height="0dp"
                    android:background="@drawable/background_login"
                    android:layout_weight="1"
        android:layout_marginBottom="@dimen/margin_large"></LinearLayout>

        <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="0dp"
                android:orientation="vertical"
                android:layout_marginTop="-60dp"
                android:layout_weight="1"
        >


            <android.support.v7.widget.CardView
                    android:id="@+id/card_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_marginLeft="@dimen/margin_large"
                    android:layout_marginRight="@dimen/margin_large"
                    android:layout_marginBottom="30dp"
                    android:background="@android:color/white"
                    card_view:cardCornerRadius="@dimen/margin_card_medium"
                    card_view:cardElevation="@dimen/margin_card_medium">

                <LinearLayout
                        android:layout_width="match_parent"
                        android:layout_height="match_parent"
                        android:orientation="vertical"
                        android:padding="@dimen/margin_medium_2">

                    <TextView android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="@string/login"
                            android:gravity="center"
                            android:textSize="@dimen/text_regular_3x"
                            android:textColor="@color/secondaryText"/>

                    <TextView android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:text="@string/email"
                            android:textSize="@dimen/text_small"
                            android:textColor="@color/colorBlue"
                            android:layout_marginTop="@dimen/margin_medium"/>

                    <EditText
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:id="@+id/ed_email"
                            android:textSize="@dimen/text_regular"
                            android:inputType="textEmailAddress"/>

                    <TextView android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:textSize="@dimen/text_small"
                            android:text="@string/password"
                            android:textColor="@color/colorBlue"
                            android:layout_marginTop="@dimen/margin_large"/>

                    <EditText
                            android:id="@+id/ed_password"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:textSize="@dimen/text_regular"
                            android:inputType="textPassword"/>



                        <CheckBox
                                android:layout_width="match_parent"
                                android:layout_height="wrap_content"
                                android:text="@string/show_password"
                                android:textSize="@dimen/text_small"
                                android:textColor="@color/secondaryText"
                                android:buttonTint="@color/secondaryText"
                                android:checked="true"
                        />


                </LinearLayout>

            </android.support.v7.widget.CardView>

        </RelativeLayout>
        <Button
        android:layout_width="200dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_gravity="center"
        android:layout_marginTop="-55dp"
        android:elevation="15dp"
        android:text="Log In"
        android:textColor="@color/colorWhite"
        android:layout_alignParentBottom="true"
        android:background="@drawable/shapesignup"

        />

    </LinearLayout>
    <TextView
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|center"
    android:text="FORGOT PASSWORD?"
    android:layout_centerHorizontal="true"
    android:layout_alignParentBottom="true"
    android:textColor="@color/secondaryText"
    android:textSize="@dimen/text_small"
    android:layout_margin="@dimen/margin_large"
    />
</android.support.design.widget.CoordinatorLayout>    

OutPut

Here background_login

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
    <gradient
            android:angle="225"
            android:startColor="@color/colorBlue"
            android:endColor="#21d6d3" />
</shape>