NestedScrollView Overlapping toolbar (They are inside of a Fragment Layout)

Question

I'm trying to add CoordinatorLayoutincluding a Toolbar inside of a Fragment layout. But the problem is that the contents of the NestedScrollView Overlapping to the Toolbar, as you see in image below :

I tried to add a RelativeLayout parent and use android:layout_below="@+id/coordinatorlayout" for the NestedScrollView,but this make the content of NestedScrollView not showing up.

Fragment layout Code :

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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.CoordinatorLayout
    android:id="@+id/coordinatorlayout"
    android:layout_height="match_parent"
    android:layout_width="match_parent">

    <android.support.v7.widget.Toolbar
        android:background="@color/colorPrimary"
        android:id="@+id/toolbar2"
        android:layout_height="?attr/actionBarSize"
        android:layout_width="match_parent"
        app:contentInsetStart="0dp"
        app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
        app:titleTextColor="#FFFFFF">

        <RelativeLayout
            android:layout_height="wrap_content"
            android:layout_width="wrap_content">

            <android.support.v7.widget.CardView      
                android:layout_height="40dp"
                android:layout_width="match_parent">

                <RelativeLayout
                    android:layout_height="match_parent"
                    android:layout_width="match_parent">

                    <ImageView
                        android:id="@+id/search_icon"
                        android:layout_alignParentRight="true"
                        android:layout_height="24dp"
                        android:layout_width="24dp"
                        android:src="@drawable/ic_search_black_24dp" />

                    <EditText
                        android:hint="Search"
                        android:id="@+id/searchEditText"
                        android:layout_height="wrap_content"
                        android:layout_width="match_parent"/>
                </RelativeLayout>
            </android.support.v7.widget.CardView>
        </RelativeLayout>
    </android.support.v7.widget.Toolbar>
</android.support.design.widget.CoordinatorLayout>

<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">

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent">

            <Button
                android:layout_width="match_parent"
                android:layout_height="150dp"
                android:layout_marginRight="50dp"
                android:layout_marginLeft="50dp"
                android:text="hello"/>

        </RelativeLayout>
    </LinearLayout>
</android.support.v4.widget.NestedScrollView>
</RelativeLayout>

Answer 1

1. Use CoordinatorLayout as root layout.

2. Add AppBarLayout and NestedScrollView inside CoordinatorLayout.

3. Put Toolbar inside AppBarLayout.

Here is the working code:

<?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:layout_width="match_parent"
        android:layout_height="wrap_content">

        <android.support.v7.widget.Toolbar
            android:background="@color/colorPrimary"
            android:id="@+id/toolbar2"
            android:layout_height="?attr/actionBarSize"
            android:layout_width="match_parent"
            app:contentInsetStart="0dp"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:titleTextColor="#FFFFFF">

            <RelativeLayout
                android:layout_height="wrap_content"
                android:layout_width="wrap_content">

                <android.support.v7.widget.CardView
                    android:layout_height="40dp"
                    android:layout_width="match_parent">

                    <RelativeLayout
                        android:layout_height="match_parent"
                        android:layout_width="match_parent">

                        <ImageView
                            android:id="@+id/search_icon"
                            android:layout_alignParentRight="true"
                            android:layout_height="24dp"
                            android:layout_width="24dp"
                            android:src="@drawable/ic_search_black_24dp" />

                        <EditText
                            android:hint="Search"
                            android:id="@+id/searchEditText"
                            android:layout_height="wrap_content"
                            android:layout_width="match_parent"/>
                    </RelativeLayout>
                </android.support.v7.widget.CardView>
            </RelativeLayout>
        </android.support.v7.widget.Toolbar>
    </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">

            <RelativeLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent">

                <Button
                    android:layout_width="match_parent"
                    android:layout_height="150dp"
                    android:layout_marginRight="50dp"
                    android:layout_marginLeft="50dp"
                    android:text="hello"/>

            </RelativeLayout>
        </LinearLayout>
    </android.support.v4.widget.NestedScrollView>

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

OUTPUT:

Hope this will help~

Answer 2

Thanks to @tompadre
The one and only solution was that i have to change the width="match_parent" of both CoordinatorLayout and NestedScrollView to wrap_content and the add this code below to NestedScrollView :

android:layout_below="@+id/coordinatorlayout"

a really simple problem wasted my time for an hour :/