How to zero applayout height with CoordinatorLayout?

42 How to zero applayout height with CoordinatorLayout?

<?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"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:fitsSystemWindows="true"    tools:context="pom.poly.com.myapplication.ScrollingActivity">    <android.support.design.widget.AppBarLayout        android:id="@+id/app_bar"        android:layout_width="match_parent"        android:layout_height="@dimen/app_bar_height"        android:fitsSystemWindows="true"        android:theme="@style/AppTheme.AppBarOverlay">        <android.support.design.widget.CollapsingToolbarLayout            android:id="@+id/toolbar_layout"            android:layout_width="match_parent"            android:layout_height="0dp"            android:layout_weight="1"            android:fitsSystemWindows="true"            app:contentScrim="?attr/colorPrimary"            app:layout_scrollFlags="scroll">            <android.support.v7.widget.Toolbar                android:id="@+id/toolbar"                android:layout_width="match_parent"                android:layout_height="?attr/actionBarSize"                android:minHeight="0dp"                />            <!--app:layout_collapseMode="pin"-->            <!--app:popupTheme="@style/AppTheme.PopupOverlay"-->        </android.support.design.widget.CollapsingToolbarLayout>        <Button            android:layout_width="match_parent"            android:layout_height="0dp"            android:layout_weight="1"            android:text="Button"            app:layout_scrollFlags="scroll|enterAlways" />    </android.support.design.widget.AppBarLayout>    <include layout="@layout/content_scrolling" /> </android.support.design.widget.CoordinatorLayout>

<?xml version="1.0" encoding="utf-8"?> <android.support.v4.widget.NestedScrollView 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"    app:layout_behavior="@string/appbar_scrolling_view_behavior"    tools:context="pom.poly.com.myapplication.ScrollingActivity"    tools:showIn="@layout/activity_scrolling">    <TextView        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_margin="@dimen/text_margin"        android:text="@string/large_text" /> </android.support.v4.widget.NestedScrollView>