Permissions.askAsync(Permissions.NOTIFICATIONS)不工作React-native

Question

我是第一次接触React-native。下面提到了依赖关系

 "dependencies": {
    "@react-native-community/masked-view": "0.1.6",
    "@react-navigation/drawer": "^5.8.2",
    "@react-navigation/native": "^5.5.1",
    "@react-navigation/stack": "^5.2.10",
    "axios": "^0.19.2",
    "expo": "37.0.8",
    "expo-notifications": "^0.1.1",
    "expo-permissions": "^8.1.0",
    "expo-secure-store": "^8.1.0",
    "ngrok": "^3.2.7",
    "react": "~16.9.0",
    "react-dom": "~16.9.0",
    "react-native": "https://github.com/expo/react-native/archive/sdk-37.0.1.tar.gz",
    "react-native-animatable": "^1.3.3",
    "react-native-datepicker": "^1.7.2",
    "react-native-elements": "^2.0.2",
    "react-native-gesture-handler": "^1.6.1",
    "react-native-reanimated": "~1.7.0",
    "react-native-safe-area-context": "0.7.3",
    "react-native-safe-area-view": "^1.1.1",
    "react-native-screens": "~2.2.0",
    "react-native-swipeout": "^2.3.6",
    "react-native-vector-icons": "^6.6.0",
    "react-native-web": "~0.11.7",
    "react-redux": "^7.2.0",
    "redux": "^4.0.5",
    "redux-logger": "^3.0.6",
    "redux-persist": "^6.0.0",
    "redux-thunk": "^2.3.0"
  }

这是我需要检查权限的部分，如果没有权限，我需要请求它。

import * as Permissions from "expo-permissions"

import { Notifications} from 'expo'

obtainNotificationPermission =  async () => {

    const { status: existingStatus } = await Permissions.getAsync(Permissions.NOTIFICATIONS)
   
    if( existingStatus !== 'granted'){
        const nextpermission = await Permissions.askAsync(Permissions.NOTIFICATIONS)
        
        if(nextpermission.status !=='granted'){
            Alert.alert('Permission not granted to show notifications')
        }
    }
   
}

presentLocalNotification = async (date) =>{
   await this.obtainNotificationPermission();
    Notifications.presentLocalNotificationAsync({title:'test',body: 'Reservation for'+date+' 
    requested',
    android:{
        sound: true,
        vibrate: true
        }
    })    
}

如果我手动允许权限，我将收到通知。但是如果我没有给expo通知权限并尝试运行应用程序，它甚至不会请求权限，警报就会显示出来。知道哪里出了问题吗？

Answer 1

我们一直在努力解决这个问题，因为它使得应用程序很难测试。这本身不是expo/react本身的问题，而是android的一个特性。

即使在两次安装之间，Android也会记住权限。因此，如果你安装了一次，并请求许可，然后卸载应用程序。随后出现权限对话框的尝试将不起作用。

我们必须在不同的设备上进行测试才能让它工作。