收到推送通知后，背景位置并检查Expo应用程序

如何解决收到推送通知后，背景位置并检查Expo应用程序

我有一个Expo应用程序，即使该应用程序已关闭，我也需要在后台运行地理围栏。我正在通过类似C＃应用程序的推送通知发送纬度和经度。

PushBody = data.DESCRIPTION +“ []” + data.LAT +“ []” + data.LON +“ []” + data.MAXRADIUS

任务是，如果电话在提供的坐标内，我需要显示推送通知

我的App.js文件如下

import React,{ useEffect } from 'react';
import { Platform,StatusBar,StyleSheet,View } from 'react-native';
import { AppLoading,Notifications
} from 'expo';

import { Asset } from 'expo-asset';

import * as Font from 'expo-font';
import * as Icon from '@expo/vector-icons';

import * as Location from 'expo-location';
import * as TaskManager from 'expo-task-manager';
import * as Permissions from 'expo-permissions';

const LOCATION_TRACKING = 'location-tracking';

import Navigator from './navigation';

import Dimensions_provider from './components/providers/dimension';
import {Permission_provider} from './components/providers/permission';
import {Signal_provider} from './components/providers/signal';
import {User_provider} from './components/providers/user';

import Notification from './components/notification';


export default class App extends React.Component {
  constructor() {
    super(...arguments);
    this.reset_notification = this.reset_notification.bind(this);
  }
  state = {
    isLoadingComplete: false,notification : {}
  };
  componentDidMount() {
    console.log('App mounted');
    this._notificationSubscription = Notifications.addListener(this._handleNotification)
  }
  reset_notification = () => {
    this.setState({notification : {}});
  }
  _handleNotification = (notification) => {
    console.log(`


      `)
    console.log(`[NOTIFICATION] HANDLE`);
    console.log(notification);
    console.log(`


      `)
    this.setState({notification});
  }

  render() {
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      return (
        <Permission_provider>
          <Dimensions_provider>
            <User_provider>
              <Signal_provider>
                <View style={styles.container}>
                  {Platform.OS === 'ios' && <StatusBar barStyle="default" />}
                  <Navigator {...this.props}/>

                  {this.state.notification.remote &&
                    <Notification notification={this.state.notification} reset={this.reset_notification}/>
                  }
                </View>
              </Signal_provider>
            </User_provider>
          </Dimensions_provider>
        </Permission_provider>
      );
    }
  }

  _loadResourcesAsync = async () => {
    return Promise.all([
      Asset.loadAsync([
        require('./assets/images/icon-hot-news.png'),require('./assets/images/icon-info.png'),require('./assets/images/icon-inquiry.png'),require('./assets/images/icon-map.png'),require('./assets/images/icon-buletin.png'),require('./assets/images/icon-signal.png'),require('./assets/images/novini.png'),require('./assets/images/query.png'),]),Font.loadAsync({
        ...Icon.Ionicons.font,'space-mono': require('./assets/fonts/SpaceMono-Regular.ttf'),}),]);
  };

  _handleLoadingError = error => {
    console.warn(error);
  };

  _handleFinishLoading = () => {
    this.setState({ isLoadingComplete: true });
  };
}

const styles = StyleSheet.create({
  container: {
    flex: 1,backgroundColor: '#fff',},});

我已经获得许可，如果电话在推送通知中收到的纬度和经度之间，我需要一个在后台运行位置服务并显示推送通知的解决方案

如果有人帮助我，我将非常感激。几天以来，我一直陷于困境，并在互联网上搜索了我的案子。请帮忙

解决方法

即使应用程序在后台，也可以使用this库获取后台位置。 并在设备位于坐标内时使用this触发本地通知。

您必须存储从C＃应用程序中获得的坐标，并将其与从后台地理位置服务获得的设备当前位置进行交叉检查（如果它与您的条件触发本地通知相匹配）。

例如

     useEffect(() => {
          BackgroundGeolocation.configure({
            locationProvider: BackgroundGeolocation.DISTANCE_FILTER_PROVIDER,desiredAccuracy: BackgroundGeolocation.HIGH_ACCURACY,stationaryRadius: 10,distanceFilter: 1,debug: false,stopOnTerminate: true,stopOnStillActivity: false,});
          BackgroundGeolocation.on('location',location => {
            BackgroundGeolocation.startTask(taskKey => {
              BackgroundGeolocation.endTask(taskKey);
            });
            //you will get lat lon here,compare them with the one you get from c# application notification. If matched fire local notification.
           //How to fire local notification is explain better in its documentation just follow the procedure there.

          });
          BackgroundGeolocation.on('authorization',status => {
            console.log(
              '[INFO] BackgroundGeolocation authorization status: ' + status,);
            if (status !== BackgroundGeolocation.AUTHORIZED) {
              // we need to set delay or otherwise alert may not be shown
              setTimeout(
                () =>
                  Alert.alert(
                    'App requires location tracking permission','Would you like to open app settings?',[
                      {
                        text: 'Yes',onPress: () => BackgroundGeolocation.showAppSettings(),},{
                        text: 'No',onPress: () => console.log('No Pressed'),style: 'cancel',],),1000,);
            }
          });
          BackgroundGeolocation.on('background',() => {
            console.log('[INFO] App is in background');
          });
          BackgroundGeolocation.start();
    
        return function cleanup() {
          BackgroundGeolocation.removeAllListeners();
         
        };
      },[]);