Android Collapsing toolbar Example java

1/  Design layout xml file and customize as per your requirment

<!-- Use coordinetor layout -->

<?xml version="1.0" encoding="utf-8"?>
<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_height="250dp"
        android:layout_width="match_parent"
        >

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            app:toolbarId="@+id/toolbar"
            app:titleCollapseMode="scale"
            app:titleEnabled="true"
            app:collapsedTitleTextColor="@color/black"
            app:expandedTitleTextColor="#0032CD32"
            app:layout_scrollFlags="scroll|snap|exitUntilCollapsed"
            app:layout_scrollInterpolator="@android:anim/decelerate_interpolator"

            app:contentScrim="@color/mint_green">

        

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_height="?attr/actionBarSize"
                android:layout_width="match_parent"
                app:title="Ghor Bagan"
                app:titleTextColor="@color/black"
                app:layout_collapseMode="pin"
                app:titleTextAppearance="@style/TextAppearance.AppCompat.Large"/>
        </com.google.android.material.appbar.CollapsingToolbarLayout>
    </com.google.android.material.appbar.AppBarLayout>

    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:padding="5dp"
        android:background="@drawable/dashboard_bg_shape"
        app:layout_behavior="com.google.android.material.appbar.AppBarLayout$ScrollingViewBehavior">


    </androidx.core.widget.NestedScrollView>


</androidx.coordinatorlayout.widget.CoordinatorLayout>

2/  to set the toolbar and enable the collapsing effect in Java

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

// To set title programmatically
getSupportActionBar().setTitle("Toolbar title");