Permissions handling in Flutter

Introduction

Apps need permission to access sensitive features like camera or location. Handling permissions lets your app ask users for access safely and politely.

When your app needs to take photos or videos using the camera.

When your app wants to get the user's current location.

When your app needs to read or write files on the device storage.

When your app wants to send notifications or access contacts.

Syntax

Flutter

import 'package:permission_handler/permission_handler.dart';

Future<bool> requestPermission() async {
  var status = await Permission.camera.status;
  if (!status.isGranted) {
    status = await Permission.camera.request();
  }
  return status.isGranted;
}

Use the permission_handler package to manage permissions in Flutter.

Always check permission status before requesting to avoid unnecessary prompts.

Examples

Check and request location permission.

Flutter

var status = await Permission.location.status;
if (!status.isGranted) {
  status = await Permission.location.request();
}

Request storage permission only if it is denied.

Flutter

if (await Permission.storage.isDenied) {
  await Permission.storage.request();
}

If permission is permanently denied, open app settings for manual change.

Flutter

if (await Permission.camera.isPermanentlyDenied) {
  openAppSettings();
}

Sample App

This app shows a button to check and request camera permission. The text updates to show if permission is granted or denied.

Flutter

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

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: PermissionExample(),
    );
  }
}

class PermissionExample extends StatefulWidget {
  @override
  State<PermissionExample> createState() => _PermissionExampleState();
}

class _PermissionExampleState extends State<PermissionExample> {
  String _status = 'Unknown';

  Future<void> checkCameraPermission() async {
    var status = await Permission.camera.status;
    if (!status.isGranted) {
      status = await Permission.camera.request();
    }
    setState(() {
      _status = status.isGranted ? 'Camera Permission Granted' : 'Camera Permission Denied';
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text('Permission Handling')),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(_status, style: TextStyle(fontSize: 20)),
            SizedBox(height: 20),
            ElevatedButton(
              onPressed: checkCameraPermission,
              child: Text('Check Camera Permission'),
            ),
          ],
        ),
      ),
    );
  }
}

Important Notes

Always explain to users why you need permissions before requesting.

Handle the case when users permanently deny permissions by guiding them to app settings.

Test permissions on real devices because emulators may behave differently.

Summary

Permissions let apps access sensitive device features safely.

Use the permission_handler package to check and request permissions in Flutter.

Always update the UI to reflect permission status for better user experience.