How to hide/show toolbar while scrolling

Aman Gupta

22 December 2016

In this blog,
I showed how to achieve hiding/showing Toolbar when the list is scrolling by Design Support Library and we don’t need to do it manually.

I will show how to use CoordinatorLayout and create a simple Behavior to hiding/show Toolbar when list scrolls up/down.

What to do

In below example, I will use a CoordinatorLayout as a parent Layout and use a ToolBar with AppBarLayout. And a recylerView which will be scrolled.

So,

Step 1: Create a ToolBar separately for use it in an entire application

toolbar.xml

<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

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:titleTextColor="#FFFFFF"

app:layout_scrollFlags="scroll|enterAlways"

toolbar: – A Toolbar is a generalized form of action bars for use within application layouts.

Set this flag to your ToolBar.

1	app:layout_scrollFlags="scroll\|enterAlways"

this app:layout_scrollFlags attribute, performs scroll events in the RecyclerView trigger changes inside views declared within AppBarLayout.

enterAlways: The view will become visible when scrolling up.

snap: Using this option will determine what to do when a view only has been partially reduced.

Step 2: Create the other XML file where you want to apply hide/show property

hide_show.xml

<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:orientation="vertical"
        android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

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

<android.support.v7.widget.RecyclerView
        android:id="@+id/my_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

<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:orientation="vertical"

android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar">

<include

android:id="@+id/toolbar"

layout="@layout/toolbar" />

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

<android.support.v7.widget.RecyclerView

android:id="@+id/my_recycler_view"

android:layout_width="match_parent"

android:layout_height="match_parent"

android:clipToPadding="false"

app:layout_behavior="@string/appbar_scrolling_view_behavior" />

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

CoordinatorLayout: – CoordinatorLayout has the ability to achieve many of the Google’s Material Design scrolling effects.

AppBarLayout: – AppBarLayout is a vertical LinearLayout which performs many of the features of material designs app bar concept, namely scrolling gesticulation.

recylerView: – Android now give the RecyclerView widget, a new and enhanced view group for displaying very large collections of data.

Set the behavior in recycler view

1	app:layout_behavior="@string/appbar_scrolling_view_behavior"

We have to define AppBarLayout and the View that will be scrolled.

Add a app:layout_behavior to a RecyclerView or any other View prepared of nested scrolling such as NestedScrollView.

By Adding the above property in your XML, you can achieve the ability to hide and showing toolbar while scrolling.