TaskManager:任务"firstTask“已执行，但似乎没有定义。确保在初始化阶段调用"TaskManager.defineTask“

Question

我正在运行一个EAS应用程序，在那里我必须使用博览-任务管理器来处理背景位置。当我的应用程序构建时，我会遇到这样的错误：

TaskManager: Task "firstTask" has been executed but looks like it is not defined. Please make 
sure that "TaskManager.defineTask" is called during initialization phase.

下面是我在我的应用程序中执行任务管理器的代码，但是我很难知道在“初始化阶段”我会把它称为什么地方。

import * as TaskManager from 'expo-task-manager'
import * as BackgroundFetch from 'expo-background-fetch'
import * as Location from 'expo-location'

const LOCATION_TASK_NAME = 'background-location-task'

useFocusEffect(
    React.useCallback(()=>{

       const requestBackgroundPermissions = async() =>{
       const {status} = await Location.requestBackgroundPermissionsAsync()
         if(status === 'granted'){
           await Location.startLocationUpdatesAsync('firstTask',{
             accuracy: Location.Accuracy.Balanced,
       });
     }
     requestBackgroundPermissions()

    },
    [],
   ),
 )

//在useFocusEffect之外

TaskManager.defineTask('firstTask',({data,errror})=>{
    if(error){
      alert('Something went wrong with background locations')
    }
    if(data){
      alert('Something went right with background locations')
      const{locations} = data
    }
})

Answer 1

因此，如果遇到此问题，请尝试将任务管理器移动到App.js文件中。当应用程序加载时，任务管理器将成为初始化阶段的一部分。如果你有任何问题，可以随意接触，但它应该是这样的：

import React from "react"
import {StyleSheet} from 'react-native'
import * as TaskManager from 'expo-task-manager'
import * as BackgroundFetch from 'expo-background-fetch'
import * as Location from 'expo-location'

const LOCATION_TASK_NAME = 'background-location-task'

TaskManager.defineTask('firstTask',({data,errror})=>{
    if(error){
      alert('Something went wrong with background locations')
    }
    if(data){
      alert('Something went right with background locations')
      const{locations} = data
    }
})

export default function App(){

return <AppFile/>

}