Android – how to animate toolbars like the contacts application in Lollipop

I'm developing this application. I want to implement a folding animation similar to the contact application. I can't find a tutorial to use with the toolbar in the support library

This is a video showing Animation: http://material-design.storage.googleapis.com/publish/v_ 2/material_ ext_ publish/0B0NGgBg38lWWZ1F2b1pUOGFiZHc/patterns-scrollingtech-scrolling-070801_ Flexible_ Space_ with_ Image_ xhdpi_ 002.webm

resolvent:

The following code implements the operation of the "expand / collapse" toolbar

Basically, we will have a coordinatorlayout (FrameLayout), appbarlayout (vertical LinearLayout realizes many functions of things design), collapsingtoolbarlayout (wrapper of toolbar), ImageView and toolbar

<android.support.design.widget.AppBarLayout
    android:id="@+id/appbar"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:fitsSystemWindows="true"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">
    <android.support.design.widget.CollapsingToolbarLayout
        android:id="@+id/collapsing_toolbar"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        app:contentScrim="?attr/colorPrimary"
        app:expandedTitleMarginEnd="64dp"
        app:expandedTitleMarginStart="48dp"
        app:layout_scrollFlags="scroll|exitUntilCollapsed">


        <ImageView
            android:id="@+id/header"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="@drawable/logo"
            android:minHeight="300dp"
            android:scaleType="centerCrop"
            app:layout_collapseMode="parallax" />

        <android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:minHeight="?attr/actionBarSize"
            app:layout_collapseMode="pin" />


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


    <FrameLayout
        android:id="@+id/fr_container_home"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:layout_behavior="@string/appbar_scrolling_view_behavior"/>

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

Observation
- FrameLayout is necessary app: layout_behavior = "@string/appbar_scrolling_view_behavior"
-TOOLBAR Not need backgroud, insert the color in the attribute app:contentScrim = "?Attr/ColorPrimary" from our CollapsingToolbarLayout

In your class

Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
mCollapsingToolbarLayout = (CollapsingToolbarLayout)findViewById(R.id.collapsing_toolbar);
mCollapsingToolbarLayout.setTitle("YourTitle");
setSupportActionBar(toolbar);