可以使用Rxjs的switchMap和toPromise方法将Promise转换为Observable。在路由中使用resolve来解决Promise并等待其结果。以下是一个示例：

import { Injectable } from '@angular/core';
import { Resolve } from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { switchMap } from 'rxjs/operators';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class MyResolver implements Resolve {
  constructor(private http: HttpClient) { }

  resolve(): Observable {
    return this.http.get('/api/data').pipe(
      switchMap((data: any) => {
        const promise = this.http.get('/api/otherdata').toPromise();
        return Observable.fromPromise(promise).map((otherData: any) => {
          data.otherData = otherData;
          return data;
        });
      })
    );
  }
}

在路由中使用resolve：

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
import { MyResolver } from './my-resolver.service';
import { MyComponent } from './my.component';

const routes: Routes = [
  {
    path: 'details',
    component: MyComponent,
    resolve: {
      data: MyResolver
    }
  }
];

@NgModule({
  imports: [RouterModule.forChild(routes)],
  exports: [RouterModule],
  providers: [MyResolver]
})
export class MyRoutingModule { }

这将在路由被访问之前执行MyResolver中的resolve方法，并等待Promise的结果，然后使用switchMap将其包装为一个Observable以便在MyComponent中使用。