Angular Can'；t解析LocationTracker的所有参数

我试着遵循Josh Morony的示例代码， 但我似乎找不到解决办法

我从控制台得到一个错误，它显示在webrowser上，甚至在设备上

我已经添加了插件：

$ ionic cordova plugin add cordova-plugin-geolocation
$ npm install --save @ionic-native/geolocation
$ ionic cordova plugin add cordova-plugin-mauron85-background-geolocation
$ npm install --save @ionic-native/background-geolocation

这是错误消息

Uncaught Error: Can't resolve all parameters for LocationTracker: ([object Object], [object Object], [object Object], ?).at syntaxError (file:///android_asset/www/build/vendor.js:79310:34)
    at CompileMetadataResolver._getDependenciesMetadata (file:///android_asset/www/build/vendor.js:92647:35)
    at CompileMetadataResolver._getTypeMetadata (file:///android_asset/www/build/vendor.js:92515:26)
    at CompileMetadataResolver._getInjectableMetadata (file:///android_asset/www/build/vendor.js:92501:21)
    at CompileMetadataResolver.getProviderMetadata (file:///android_asset/www/build/vendor.js:92791:40)
    at file:///android_asset/www/build/vendor.js:92720:49
    at Array.forEach (native)
    at CompileMetadataResolver._getProvidersMetadata (file:///android_asset/www/build/vendor.js:92681:19)
    at CompileMetadataResolver.getNgModuleMetadata (file:///android_asset/www/build/vendor.js:92336:50)
    at JitCompiler._loadModules (file:///android_asset/www/build/vendor.js:103400:66)

pages/home/home.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { LocationTracker } from '../../providers/location-tracker/location-tracker';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

constructor(public navCtrl: NavController, public locationTracker: LocationTracker) {

    this.startTracking();
  }

  startTracking(){
    this.locationTracker.startTracking();
  }

  stopTracking(){
    this.locationTracker.stopTracking();
  }
}

/pages/home/home.html

<ion-content padding>
  <ion-label>Current Latitude: {{locationTracker.lat}</ion-label>
  <ion-label>Current Longitude: {{locationTracker.lng}}</ion-label>
</ion-content>

app/app.module.ts

import { BrowserModule } from '@angular/platform-browser';
import { ErrorHandler, NgModule } from '@angular/core';
import { IonicApp, IonicErrorHandler, IonicModule } from 'ionic-angular';
import { MyApp } from './app.component';
import { HomePage } from '../pages/home/home';
import { StatusBar } from '@ionic-native/status-bar';
import { LocationTracker } from '../providers/location-tracker/location-tracker';
import { BackgroundGeolocation } from '@ionic-native/background-geolocation';
import { Geolocation } from '@ionic-native/geolocation';


@NgModule({
  declarations: [
    MyApp,
    HomePage
  ],
  imports: [
    BrowserModule,
    IonicModule.forRoot(MyApp),
    HttpModule
  ],
  bootstrap: [IonicApp],
  entryComponents: [
    MyApp,
    HomePage
  ],
  providers: [
    StatusBar
    {provide: ErrorHandler, useClass: IonicErrorHandler}
    LocationTracker,
    BackgroundGeolocation,
    Geolocation
  ]
})
export class AppModule {}

---

如果你看一下错误，它说第四个参数不能被注入

Uncaught Error: Can't resolve all parameters for LocationTracker: ([object Object], [object Object], [object Object], ?)

从可注入的

constructor(public zone: NgZone,
            public backgroundGeolocation: BackgroundGeolocation,
            public geolocation: Geolocation,
            public geoposition: Geoposition) {
}

第四个是这个地理位置，这似乎是你没有“提供”在NGM模块

因此，只要不使用此“地理位置”实例/对象，就可以将其从构造函数中删除：

constructor(public zone: NgZone,
            public backgroundGeolocation: BackgroundGeolocation,
            public geolocation: Geolocation) {
}

---

它可以是离子2或离子3，但不能同时是：）在tagsHi onetwo12中，你指的是标记吗？我明白你的意思。我想这两个错误都可能。很好。。您的解释帮助我更好地理解了如何阅读错误…非常感谢！我现在看到了。明天我测试完后，我会给出答案。你解释得很好，很准确。你是对的。你发现了错误。但是，修复方法是从构造函数中删除地理位置，因为它不是必需的，并且不需要在NgModule中“提供”。请把它加在你的答案上，我会接受它为正确答案。非常感谢。你好@ChristianBenseler！它之所以有效，是因为页面中没有使用“地理位置”。但是，如果要使用它并且需要在构造函数中出现？

constructor(public zone: NgZone,
            public backgroundGeolocation: BackgroundGeolocation,
            public geolocation: Geolocation) {
}