How to Hide or Show Toolbar While Scrolling

Sometimes we have requirement for hiding the toolbar when some list is scroll .In this post we will learn how to hide when scroll down the list and show when scroll upside in Android Application.For this we have to follow some steps :-

Step 1: Create a ToolBar separately for use it in an entire application with name 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"    
   />  
set this flag to toolBar

app:layout_scrollFlags="scroll|enterAlways"

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.

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

with name hide_show_Activity.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">  
     <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>  

    Set the behavior in recycler view

    app:layout_behavior="@string/appbar_scrolling_view_behavior"
 
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.

   for example the result will show like this:
  Before Scrolling:
    After Scrolling:

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