Collapsing layout during scrolling in Android

Question

I would like to have custom view collapsed with a transition during scrolling.

I have AppBarLayout with a Toolbar inside. Below that there is a custom view that I want to collapse.

Below custom view there is a NestedScrollView with LinearLayout.

Toolbar is green, custom layout is pink and scroll with linear is gray:

After scrolling down:

<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">

    <android.support.design.widget.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light" />
    </android.support.design.widget.AppBarLayout>


    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="170dp"
        android:layout_marginTop="?attr/actionBarSize"
        android:background="@drawable/background"
        android:gravity="center">
    </RelativeLayout>

    <ScrollView
        android:id="@+id/scroll"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginTop="170dp"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <include
            layout="@layout/linear"
            android:layout_marginBottom="20dp"
            android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

    </ScrollView>

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

Should I go with custom behavior and CoordinatorLayout or translation with NestedScroll with translation animation?

Answer 1

Use Observable ScrollView library https://github.com/ksoichiro/Android-ObservableScrollView