NestedScrollView incomplete scroll

Question

I'm using NestedScrollView in order to reach something similar to this.

Update

This is my repo.

I figure out when the mobile turns to landscape the scroll don't let me visualize the buttons or the grey view at bottom.

This is my mainlayout.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbarLayout"
        android:layout_width="match_parent"
        android:layout_height="256dp"
        android:fitsSystemWindows="true">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:fitsSystemWindows="true"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:expandedTitleTextAppearance="@style/Toolbar.TitleText"
            app:collapsedTitleTextAppearance="@style/Toolbar.TitleText"
            app:contentScrim="?attr/colorPrimary"
            app:expandedTitleMarginStart="48dp"
            app:expandedTitleMarginEnd="64dp">

            <ImageView
                android:id="@+id/iv_tipo"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:background="@color/colorPrimary"
                android:fitsSystemWindows="true"
                android:layout_gravity="center"
                app:layout_collapseMode="parallax"
                app:srcCompat="@drawable/aviso_128dp"/>

            <!--<include layout="@layout/toolbar_pin" />-->
            <android.support.v7.widget.Toolbar
                android:id="@+id/myToolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
                app:layout_collapseMode="pin"
                app:popupTheme="@style/ThemeOverlay.AppCompat.Dark" />

            <TextView
                android:id="@+id/tv_toolbar_title"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:visibility="gone"/>

        </android.support.design.widget.CollapsingToolbarLayout>


    </android.support.design.widget.AppBarLayout>

    <android.support.v4.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

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

            <!-- A CardView that contains a TextView -->
            <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
                android:id="@+id/card_view"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginLeft="20dp"
                android:layout_marginRight="20dp"
                android:layout_marginTop="10dp"
                card_view:cardCornerRadius="4dp">

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

                    <include
                        android:id="@+id/field_nombre"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_direccion"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_direccion2"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_localidad"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_provincia"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_telefono"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_email"
                        layout="@layout/actividad_field" />

                    <include layout="@layout/actividad_separator" />

                    <include
                        android:id="@+id/field_descripcion"
                        layout="@layout/actividad_field" />


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


            <LinearLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:layout_marginTop="10dp"
                android:orientation="horizontal">

                <Button
                    android:id="@+id/bt_productos"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Ver productos" />

                <Button
                    android:id="@+id/bt_finalizar"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:text="Finalizar" />
            </LinearLayout>

            <View
                android:layout_width="match_parent"
                android:layout_height="20dp"
                android:background="@color/gray"/>
        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>

</android.support.design.widget.CoordinatorLayout>

And the actividad_separator.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal" android:layout_width="match_parent"
    android:layout_height="wrap_content">

    <View
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="0dp"/>

    <View
        android:layout_width="0dp"
        android:layout_weight="8"
        android:layout_height="1dp"
        android:background="@color/divider"/>

    <View
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="0dp"/>

</LinearLayout>

And the actividad_field.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="10dp"
    android:layout_marginBottom="10dp"
    android:orientation="horizontal">

    <View
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="0dp"/>

    <LinearLayout
        android:layout_width="0dp"
        android:layout_weight="8"
        android:layout_height="wrap_content"
        android:orientation="horizontal">

        <ImageView
            android:id="@+id/iv_field"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            app:srcCompat="@drawable/ic_person_primary_36dp" />

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

            <TextView
                android:id="@+id/tv_clave"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:textSize="10sp"
                android:text="Clave" />

            <TextView
                android:id="@+id/tv_valor"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="10dp"
                android:textStyle="bold"
                android:text="Valor"/>
        </LinearLayout>
    </LinearLayout>

    <View
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="0dp"/>
</LinearLayout>

This is how looks like:

This is how it works (incomplete scrolling because I cant see the grey bar at the bottom):

Answer 1

Inside NestedScrollView add android:paddingBottom="50dp"

<LinearLayout
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:paddingBottom="50dp"
     android:orientation="vertical">