react-native-fs cannot access storage

Question

i'm using react-native-fs package to save files to android storage.

when i perform these two lines of code, it works

await RNFS.readDir(RNFS.DocumentDirectoryPath);
=====>/data/user/0/com.youtubedljs/files
await RNFS.readDir(RNFS.CachesDirectoryPath);
=====>/data/user/0/com.youtubedljs/cache

but when i try to access external storage, like Download or documents files

await RNFS.readDir(RNFS.DownloadDirectoryPath);

i get this error

Error: Attempt to get length of null array

i already granted storage permissions to the application, it didn't work.

Update: Works fine on android 8.1, i think that the package doesn't support android 10 yet

it is related to android Q privacy change : [here is tomporary solution](https://stackoverflow.com/a/56821320/11616789) — Abdelkader Oumrani, Aug 04 '20 at 00:30

mainak · Answer 1 · 2020-07-31T13:17:45.697

3

Need to give read-write permissions.

that's okay.. but you also need to get incode permissions, before accessing file

import {PermissionsAndroid} from 'react-native';

const granted = await PermissionsAndroid.request(
      PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE,
    );
    if (granted === PermissionsAndroid.RESULTS.GRANTED) {
      //alert('You can use the location');
      console.log('write granted');
      return true;
    } else {
      return false;
    }
  } catch (err) {
    console.warn(err);
    return false;
  }

edited Jul 31 '20 at 13:17

answered Jul 31 '20 at 13:09

mainak

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i added these two lines, same issue ` ` – Abdelkader Oumrani Jul 31 '20 at 13:11
that's okay.. but you also need to get incode permissions, before accessing file see my edited reply above – mainak Jul 31 '20 at 13:16
`const granted = await PermissionsAndroid.request( PermissionsAndroid.PERMISSIONS.WRITE_EXTERNAL_STORAGE, ); if (granted === PermissionsAndroid.RESULTS.GRANTED) { await RNFS.readDir(RNFS.DownloadDirectoryPath); } else { console.log('not granted'); }` the access is granted but the error remains **Error: Attempt to get length of null array** – Abdelkader Oumrani Jul 31 '20 at 13:27
@AbdelkaderOumrani were you able to fix the issue? I'm also getting this error after upgrading to android x. Would be helpful if you could share the steps to fix this. – vindev Aug 30 '20 at 14:16
You can’t save the file “statement19May2021.pdf” because the volume “APPLE SSD - Data” is read only Getting this error After try to copy a file in iOS Documents folder – Rover May 19 '21 at 05:34

score 0 · Answer 2 · answered Sep 01 '22 at 10:14

First you have to ask for permission 
then you can save the into download folder of mobile
import {request, PERMISSIONS} from 'react-native-permissions';

 request(
      Platform.OS === 'ios'
        ? PERMISSIONS.IOS.MEDIA_LIBRARY
        : PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE,
    ).then(result => {
      console.log(result);
     
      );
    });

 var path = RNFS.DownloadDirectoryPath + '/filename.txt';

react-native-fs cannot access storage

2 Answers2