在Angular中，可以使用Angular Router和Angular Material来实现面包屑导航。以下是一个简单的示例：

1. 首先，安装Angular Router和Angular Material：

npm install @angular/router
npm install @angular/material

2. 在app.module.ts文件中导入所需的模块：

import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { RouterModule } from '@angular/router';
import { MatToolbarModule } from '@angular/material/toolbar';
import { MatIconModule } from '@angular/material/icon';

import { AppComponent } from './app.component';
import { HomeComponent } from './home.component';
import { AboutComponent } from './about.component';
import { ContactComponent } from './contact.component';

@NgModule({
  declarations: [
    AppComponent,
    HomeComponent,
    AboutComponent,
    ContactComponent
  ],
  imports: [
    BrowserModule,
    RouterModule.forRoot([
      { path: '', component: HomeComponent },
      { path: 'about', component: AboutComponent },
      { path: 'contact', component: ContactComponent }
    ]),
    MatToolbarModule,
    MatIconModule
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

3. 创建一个名为breadcrumb.component.ts的组件文件，用于显示面包屑导航：

import { Component, OnInit } from '@angular/core';
import { Router, NavigationEnd, ActivatedRoute } from '@angular/router';

@Component({
  selector: 'app-breadcrumb',
  template: `
    
      home
      
        {{ breadcrumb.label }}
        {{ breadcrumb.label }}
        >
      
    
  `
})
export class BreadcrumbComponent implements OnInit {
  breadcrumbs: Array<{ label: string, url: string }> = [];

  constructor(private router: Router, private activatedRoute: ActivatedRoute) { }

  ngOnInit() {
    this.router.events.subscribe(event => {
      if (event instanceof NavigationEnd) {
        this.breadcrumbs = [];
        this.parseRoute(this.activatedRoute.root);
      }
    });
  }

  parseRoute(route: ActivatedRoute) {
    if (route.routeConfig && route.routeConfig.data && route.routeConfig.data.breadcrumb) {
      let url = route.routeConfig.path;
      let label = route.routeConfig.data.breadcrumb;
      let breadcrumb = { label: label, url: url };
      this.breadcrumbs.push(breadcrumb);
    }

    if (route.firstChild) {
      this.parseRoute(route.firstChild);
    }
  }
}

4. 在app.component.html中使用BreadcrumbComponent组件显示面包屑导航：

5. 在每个路由组件中，通过路由配置的data属性来设置面包屑导航的标签：

import { Component } from '@angular/core';

@Component({
  template: `
    
About
  `,
  data: {
    breadcrumb: 'About'
  }
})
export class AboutComponent { }

import { Component } from '@angular/core';

@Component({
  template: `
    
Contact
  `,
  data: {
    breadcrumb: 'Contact'
  }
})
export class ContactComponent { }

使用以上代码示例，你可以在Angular应用程序中实现一个简单的面包屑导航功能。