离子5 /角9：@ mauron85 / cordova-plugin-background-geolocation，无法启动

问题描述

我不知道为什么该插件无法在我的应用中运行：https://ionicframework.com/docs/native/background-geolocation

我的代码：https://plnkr.co/edit/LAfbfU5edGhQmmkg?open=lib%2Fapp.ts&deferRun=1

它运行startBackgroundGeolocation（），但从不输入“ .subscribe”，甚至不输入第54行的app.component.ts中的“ .then（）”块：

import { Component,OnInit } from '@angular/core';
import { AngularFirestore } from '@angular/fire/firestore';
import { AngularFireDatabase } from '@angular/fire/database';
import * as firebase from 'firebase';
import * as moment from 'moment-timezone';
import { Platform } from '@ionic/angular';
import {
  BackgroundGeolocation,BackgroundGeolocationConfig,BackgroundGeolocationResponse,BackgroundGeolocationEvents
} from '@ionic-native/background-geolocation/ngx';

import { AuthService } from './auth/auth.service';


@Component({
  selector: 'app-root',templateUrl: 'app.component.html',styleUrls: ['app.component.scss']
})
export class AppComponent implements OnInit {
  positionSubscription: Subscription;

  constructor(
    private platform: Platform,private dbRt: AngularFireDatabase,private backgroundGeolocation: BackgroundGeolocation
  ) {
    this.initializeApp();
  }

  initializeApp() {
    this.platform.ready().then(() => {
      this.startBackgroundGeolocation();
    });
  }

  startBackgroundGeolocation() {
    const config: BackgroundGeolocationConfig = {
      desiredAccuracy: 10,stationaryRadius: 1,distanceFilter: 0,interval: 1000,fastestInterval: 1000,activitiesInterval: 1000,stopOnStillActivity: false,startForeground: true,startOnBoot: true,debug: true,//  enable this hear sounds for background-geolocation life-cycle.
      stopOnTerminate: false // enable this to clear background location settings when the app terminates
    };

    this.backgroundGeolocation.configure(config).then(() => {
      this.backgroundGeolocation
        .on(BackgroundGeolocationEvents.location)
        .subscribe((location: BackgroundGeolocationResponse) => {
          console.log(location);

          if (location.speed === undefined) {
            location.speed = 0;
          }

          this.dbRt.database
            .ref(`/gps/${this.authService.userprofile.value.uid}`)
            .push({
              date: moment.tz('Indian/Mauritius').format('DD-MM-YYYY HH:mm:ss'),timestamp: firebase.database.ServerValue.TIMESTAMP,platform: 'background GPS !!!'
            })
            .then((res) => {
              // this.backgroundGeolocation.finish(); // FOR IOS ONLY
            })
            .catch((error) => {
              // this.backgroundGeolocation.finish(); // FOR IOS ONLY
            });

          // IMPORTANT:  You must execute the finish method here to inform the native plugin that you're finished,// and the background-task may be completed.  You must do this regardless if your operations are successful or not.
          // IF YOU DON'T,ios will CRASH YOUR APP for spending too much time in the background.
        });
    });

    // start recording location
    this.backgroundGeolocation.start().then((state) => {
          console.log('state: ' + state);
    });
  }
}

它似乎甚至没有在第84行开始backgroundGeolocation：

this.backgroundGeolocation.start().then((state) => {
     console.log('state: ' + state);
});

我正在使用appflow创建apk并在Samsung S8 / Android 7.0上对其进行了测试，它甚至没有像常规地理位置那样提示我授予任何访问权限。我希望获得backgroundGeolocation许可以允许，但不会弹出任何消息。

当我尝试实施常规的Geolocation插件（https://ionicframework.com/docs/native/geolocation）时，一切正常，当我首次启动该应用程序时，我获得了Grant geolocation许可，并且可以将lat / lng保存到我的数据库中。

解决方法

您已设置

期望精度：10

为了让它工作，你需要有一个距离旧位置 10m 的新位置。