Question 215633 in Flutter Question posted in
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failing to create a file in flutter

i am creating a file as json for storing notes backup

here is the method for creating file,

before i write notes, it showing error in this method to opening a file

Future<void> writeNotesToFile() async {
  String path ='/storage/emulated/0/Android/data/com.example.noteapp/backup_note.json';
  File? file = File(path);
  print(path);
  bool doesFileExists = await file.exists();

  print(doesFileExists.toString());
  if (doesFileExists==false) {
     file.create();
  }
 
  
}

it was working fine…but when i uninstalled the app and installed again..its showing error while calling this method…I have not changed path

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2

Answers


  1. 0

    Step 1: Check Permission: https://pub.dev/packages/permission_handler

    Step 2: Add this plugin to get the directory: https://pub.dev/packages/path_provider

    Use below code:

    final Directory directory = await getApplicationDocumentsDirectory();
final File file = File('${directory.path}/backup_note.json');
await file.create();
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  2. 0

    You need to add storage permission to store any file in External storage.

    For this, you can use the permission_handler package.

    I am giving an example code of how you can get that permission.

    1. Add the permission_handler package to your pubspec.yaml file:

    permission_handler: ^9.0.0

    2. Update AndroidManifest.xml:

    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.MANAGE_EXTERNAL_STORAGE" />

    3. Request the required permissions:

    import 'package:flutter/material.dart';
import 'package:permission_handler/permission_handler.dart';

Future<void> requestStoragePermission() async {
  if (await Permission.storage.request().isGranted) {
    // Call your writeNotesToFile() method here.
    writeNotesToFile();
  } else {
    // Permission is not granted.
  }
}

    I hope this will work for you.

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