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Android Design Library: CollapsingToolbarLayout basics

Instead of using a plain Toolbar element in your AppBarLayout, you have achieve a nice parallax effect with CollapsingToolbarLayout.

Replace the old Toolbar with a CollapsingToolbarLayout setting its height to be the full uncollapsed height, give it a layout_scrollflags=scroll|exitUntilCollapsed. If you use app:layout_scrollFlags="scroll|enterAlways" it’ll uncollapse as soon as your start scrolling up.

Within such, place your old Toolbar, and give it a layout_collapseMode of pin, to say pin the Toolbar when it’s all collapsed.

Above it have a ImageView, with a the layout_collapseMode of parallax. And voila.

<android.support.design.widget.CollapsingToolbarLayout
    android:layout_width="match_parent"
    android:layout_height="250dp"
    app:layout_scrollFlags="scroll|exitUntilCollapsed"
    app:contentScrim="@android:color/holo_purple"
    >
  <ImageView
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      app:layout_collapseMode="parallax"
      android:scaleType="matrix"
      android:src="@mipmap/orb"
      />
  <android.support.v7.widget.Toolbar
      android:id="@+id/toolbar"
      android:layout_width="match_parent"
      android:layout_height="?attr/actionBarSize"
      app:layout_collapseMode="pin"
      app:popupTheme="@style/AppTheme.PopupOverlay"
      />
</android.support.design.widget.CollapsingToolbarLayout>
android android-collapsingToolbarLayout

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