Question: I find a lot of questions about how to disable the animation of an Android ActionBar. I have exactly the opposite problem. I do want the animation but it should work out of the box right?

I think the problem lies with my custom toolbar:

```
<android.support.design.widget.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/toolbar_parent"
    android:layout_width="match_parent"
    android:theme="@style/AppTheme.AppBarOverlay">

    <android.support.v7.widget.Toolbar android:id="@+id/toolbar"
        android:layout_width="match_parent" android:layout_height="@dimen/menu_height"
        android:minHeight="@dimen/menu_height"
        android:background="@color/backgroundColor" app:popupTheme="@style/AppTheme.PopupOverlay"
        android:theme="@style/ToolbarColoredBackArrow"/>

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

```

Which I set in mij activity like so:

```
 Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
 setSupportActionBar(toolbar);

```

The toolbar works fine, but no animation when I call either of these methods:

```
protected void hideActionBar(){
    ActionBar ab = getSupportActionBar();
    if (ab.isShowing()) {
        ab.hide();
    }

}

protected void showActionBar(){
    ActionBar ab = getSupportActionBar();
    if (!ab.isShowing()) {
        ab.show();
    }
}

```

What is the reason of this?

Answer: 
You can use the below code in the xml ie, for the toolbar parent for animating it when you call hide/show.

```
android:animateLayoutChanges="true"

```

OR this

**Hiding** 

```
toolbarParent.animate().translationY(-toolbarHeight).setInterpolator(new AccelerateInterpolator(2)).start();

```

**Showing**

```
toolbarParent.animate().translationY(0).setInterpolator(new DecelerateInterpolator(2)).start();

```
I suggested you try [cheesesquare](https://github.com/chrisbanes/cheesesquare) sample. this is a layout that collapsing & expanding toolbar.

```
<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/main_content"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <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"
            android:background="?attr/colorPrimary"
            app:popupTheme="@style/ThemeOverlay.AppCompat.Light"
            app:layout_scrollFlags="scroll|enterAlways|snap" />

        <android.support.design.widget.TabLayout
            android:id="@+id/tabs"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

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

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

    <android.support.design.widget.FloatingActionButton
        android:id="@+id/fab"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="end|bottom"
        android:layout_margin="@dimen/fab_margin"
        android:src="@drawable/ic_done" />

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

```