How to show a notification icon in android studio

I am building an android application where I am letting the users to sign in using google also. When they sign in using google and do not register themselves using the registration page then there are certain information which are left out.I also have a screen which updates the profile information of the user.
I want to set an icon on the home screen(kind of a bell icon) which displays that there are some notification and when the user click on that the button it tells that some information are left to be added and it redirects them to the update profile page.

The icon I want is like the notification icon(bell) in youtube.

Is there any way I can do this?

EDIT :

activity_main:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
android:background="@drawable/grdnt"
tools:context=".MainActivity">
<TextView
android:id="@+id/welcome_text"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Welcome"
android:textColor="#2AF598"
android:textSize="50dp"
android:layout_alignParentTop="true"
android:layout_marginTop="80dp"
android:gravity="center"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<Button
android:id="@+id/provide_food"
android:layout_width="270dp"
android:layout_height="60dp"
android:layout_below="@+id/welcome_text"
android:layout_marginTop="100dp"
android:layout_marginLeft="80dp"
android:gravity="center"
android:text="Do you have Food"
android:textSize="20dp"
android:background="@drawable/custombutton"
/>
<Button
android:id="@+id/need_food"
android:layout_width="270dp"
android:layout_height="60dp"
android:layout_below="@+id/provide_food"
android:layout_marginTop="50dp"
android:layout_marginLeft="80dp"
android:gravity="center"
android:text="Do you need Food"
android:textSize="20dp"
android:background="@drawable/custombutton"
/>
<Button
android:id="@+id/deliver_food"
android:layout_width="270dp"
android:layout_height="60dp"
android:layout_below="@+id/need_food"
android:layout_marginTop="50dp"
android:layout_marginLeft="80dp"
android:gravity="center"
android:text="Do you want to Deliver Food"
android:textSize="20dp"
android:background="@drawable/custombutton"
/>
</RelativeLayout>

MainActivity.java:

package com.example.helping_hands_individual;
import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
public class MainActivity extends AppCompatActivity {
Button provide, need,deliver;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
provide = (Button)findViewById(R.id.provide_food);
need = (Button)findViewById(R.id.need_food);
deliver = (Button)findViewById(R.id.deliver_food);
provide.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(MainActivity.this, Provide_food.class);
startActivity(intent);
}
});
}
}

Note: I am not using any custom toolbar, neither am I using any toolbar, my theme for the application is: NoActionBar

There are three ways to get that notification icon depending upon the theme you are using in your Activity.

1. No.ActionBar Theme: If you're not using any ActionBar or toolbar in your activity then you can create a View(ImageView or Button) in your Activity's layout file with Height and Width as same as the notification icon which is around 28dp and then position it at the top right corner of the screen. You can change the background image of the view according to the state you want.

2. Create your own toolbar: You can create your own toolbar and set the menu item in it. While creating the menu item make sure that you select showAsAction="always" this way your icon is always visible. here is a link for the reference

3.ActionBar Theme: If you're using the action bar theme then you can create a menu file with one item like in Option 2 and then override the onCreateOptionsMenu and inflate then inflate your menu in it.

  Notification notification  = new Notification.Builder(this)
.setContentTitle(title)
.setContentText(text)
.setSmallIcon(R.drawable.ic_notification)
.setContentIntent(pIntent)
.setDefaults(Notification.DEFAULT_SOUND|Notification.DEFAULT_LIGHTS|Notification.DEFAULT_VIBRATE)
.setAutoCancel(true)
.build();