angular – Ionic 3中提供者的全局实例

所以根据tutorial我已经将类添加到我的app.module.ts文件中,使其成为一个全局实例.所以据我所知,当应用初始化它的根组件(因此app.module.ts)时,服务应该启动.

问题：在应用程序的特定页面导入并使用它之前,不会调用提供程序.

在上面提到的教程中,提供者是这样导入的：

ionicBootstrap(MyApp,[TestProvider]);

不幸的是,这对我不起作用. post说这个全新的教程已经过时了.

问题：如何在启动应用程序后将Ionic 3中的提供程序用作一个实例？

我的app.module.ts：

import { NetworkConnectionProvider } from '../providers/networkconnection/networkconnection';
// (...)

@NgModule({
  declarations: [
    MyApp,// (...)
  ],imports: [
    BrowserModule,HttpModule,IonicModule.forRoot(MyApp),ionicGalleryModal.GalleryModalModule,],bootstrap: [
    IonicApp
  ],entryComponents: [
    MyApp,providers: [
    // (...)
    NetworkConnectionProvider
  ]
})
export class AppModule {}

我的提供者：

import { Injectable } from '@angular/core';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';
import { Network } from '@ionic-native/network';


@Injectable()
export class NetworkConnectionProvider {
  private TAG = "NetworkConnectionProvider ";

  private isConnectedToInternet: Boolean;

  constructor(
    public http: Http,public network: Network
    ) {

    this.isConnectedToInternet = true;

    let disconnectSubscription = this.network.onDisconnect().subscribe(() => {
      console.log(this.TAG + 'network was disconnected.');
      this.isConnectedToInternet = false;
    });

    // watch network for a connection
    let connectSubscription = this.network.onConnect().subscribe(() => {
      console.log('network connected!');
      this.isConnectedToInternet = true;

      // We just got a connection but we need to wait briefly
      // before we determine the connection type. Might need to wait.
      // prior to doing any api requests as well.
      setTimeout(() => {
        if (this.network.type === 'wifi') {
          console.log(this.TAG + 'wifi connection available');
        }
      },3000);
    });

    console.log('Hello NetworkConnectionProvider');
  }

  public subscribeOnConnect() {
    return this.network.onConnect();
  }

  public isConnected(): Boolean{
    return this.isConnectedToInternet;
  }

  public getConnectionType(): string {
    return this.network.type;
  }

}