Fragment within CollapsingToolbarLayout with ViewPager won't slide down

Question

I have an activity with a CollapsingToolbarLayout and a TabLayout. When I slide right and left it moves perfectly between fragments. However when I try to scroll down (red a

Answer 1

Try this layout. I have added TabLayout in AppBarLayout, I believe it should work same as you want. But if you want, you can keep two CollapsingToolbarLayout to achieve your desired behaviour. And make sure fitsSystemWindows should be same either true or false in all layouts else you might not see the expected behaviour.

<?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:id="@+id/root_coordinator"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true">

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

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:contentScrim="?attr/colorPrimary"
            android:fitsSystemWindows="true"
            app:layout_scrollFlags="scroll|enterAlways">

            <ImageView
                android:layout_width="match_parent"
                android:layout_height="122dp"
                android:scaleType="centerCrop"
                android:src="@drawable/rsz_bg_cover"
                app:layout_collapseMode="parallax" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
                app:layout_collapseMode="pin" />

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

        <android.support.design.widget.TabLayout
            android:id="@+id/tab_layout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@color/colorAccent"
            app:layout_collapseMode="pin"
            app:tabIndicatorColor="@color/colorPrimary"
            app:tabSelectedTextColor="@android:color/white"
            app:tabTextColor="#EEE" />
    </android.support.design.widget.AppBarLayout>

    <android.support.v4.view.ViewPager
        android:id="@+id/view_pager"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

And in Fragment layout, Use NestedScrollView and add layout_behavior in it.

<?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"
    android:background="@color/white"
    app:layout_behavior="@string/appbar_scrolling_view_behavior">

        // Your Layout

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