Ion-badge icon with badge count

Ionic Framework ionic-v3
1

Hi , I need my application ion-badge like add items in a cart. The cart icon shows the count of no.of items add in a cart. image

My source code,

<ion-fab-button mat-mini-fab size="small" (click)="showOrderItems()">

  <mat-icon matBadge="15" matBadgeColor="warn" >shopping_cart</mat-icon>

</ion-fab-button>

And, also how to show dynamic badge count in ionic