Design Android Tool bar with constraint layout

 Toolbar in Android plays a very important role in quick page movement. 

Steps to implement toolbar in Android

1. Create a layout file toolbar.xml in res/layout directory

2. add below code into your toolbar.xml file.

3. Customize this as per your requirement

<?xml version="1.0" encoding="utf-8"?><layout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools">

    <androidx.appcompat.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"

        android:background="@color/colorPrimaryDark"

        app:elevation="0dp"

        app:layout_collapseMode="pin">

        <androidx.constraintlayout.widget.ConstraintLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content">

            <ImageView
                android:id="@+id/toolbar_user_account"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentStart="true"
                android:layout_marginStart="@dimen/margin_large"
                android:src="@drawable/round_person_pin_black_24dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <ImageView
                android:id="@+id/toolbar_app_logo"
                android:layout_width="@dimen/margin_very_large"
                android:layout_height="@dimen/margin_very_large"
                android:visibility="gone"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintStart_toStartOf="parent"
                app:layout_constraintTop_toTopOf="parent" />

            <ImageView
                android:id="@+id/toolbar_app_notifications"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginEnd="@dimen/margin_large"
                android:src="@drawable/baseline_notifications_black_18dp"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintEnd_toEndOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                tools:text="Pool" />

        </androidx.constraintlayout.widget.ConstraintLayout>
    </androidx.appcompat.widget.Toolbar>
</layout>

Then include this into your other xml files

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".views.detail.DiscoverMoreFragment">

    <include
        android:id="@+id/toolbar"
        layout="@layout/toolbar" />

    <androidx.appcompat.widget.SearchView
        android:id="@+id/search_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="@dimen/margin_medium"
        android:layout_marginTop="@dimen/margin_medium"
        android:layout_marginEnd="@dimen/margin_medium"
        android:paddingStart="@dimen/padding_medium"
        android:paddingEnd="@dimen/padding_medium"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/toolbar" />

    <androidx.recyclerview.widget.RecyclerView
        android:id="@+id/grid_view_recycler_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="@dimen/margin_large"
        android:paddingStart="@dimen/padding_medium"
        android:paddingEnd="@dimen/padding_medium"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@id/search_view" />

</androidx.constraintlayout.widget.ConstraintLayout>