Solved: App Crashed When Permission is Denied from App Setting in Flutter

Are you tired of dealing with annoying app crashes in your Flutter application? Do you find yourself pulling your hair out when users report that your app is crashing after denying permission from the app settings? Well, worry no more! In this comprehensive guide, we’ll dive deep into the world of permissions in Flutter and explore the reasons behind these crashes. More importantly, we’ll provide you with step-by-step instructions to fix this issue once and for all.

The Problem: Why Does My App Crash?

When a user denies permission from the app settings, your app might crash due to the way Flutter handles permissions. By default, Flutter assumes that the user has granted the necessary permissions, and when this assumption is wrong, the app crashes.

Understanding the Permission System in Flutter

In Flutter, you can request permissions using the permission_handler package. This package provides a simple way to request permissions at runtime. However, when the user denies permission from the app settings, the permission_handler package doesn’t provide a clear way to handle this scenario.

import 'package:permission_handler/permission_handler.dart';

void requestPermission() async {
  await Permission.storage.request();
}

In the above code snippet, we’re requesting the storage permission using the permission_handler package. However, when the user denies this permission from the app settings, our app will crash.

The Solution: Handling Permission Denial

To fix the app crash issue, we need to handle the permission denial scenario. We can do this by checking the permission status before performing any action that requires the denied permission.

Checking Permission Status

We can use the permission_handler package to check the permission status. Here’s an updated version of the previous code snippet:

import 'package:permission_handler/permission_handler.dart';

void requestPermission() async {
  var status = await Permission.storage.status;
  if (status.is Denied) {
    // Handle permission denial
  } else {
    // Permission is granted
  }
}

In the above code, we’re checking the permission status using the status property. If the status is isDenied, we can handle the permission denial scenario.

Handling Permission Denial

Now that we’ve checked the permission status, we need to handle the permission denial scenario. We can do this by providing a clear error message to the user or by requesting the permission again.

import 'package:permission_handler/permission_handler.dart';

void requestPermission() async {
  var status = await Permission.storage.status;
  if (status.isDenied) {
    // Show an error message to the user
    _showErrorMessage();
  } else {
    // Permission is granted
  }
}

void _showErrorMessage() {
  showDialog(
    context: context,
    builder: (context) {
      return AlertDialog(
        title: Text('Error'),
        content: Text(' Permission is denied. Please enable it in the app settings.'),
        actions: [
          FlatButton(
            child: Text('OK'),
            onPressed: () {
              Navigator.of(context).pop();
            },
          ),
        ],
      );
    },
  );
}

In the above code, we’re showing an error message to the user when the permission is denied. This error message provides a clear instruction to the user to enable the permission in the app settings.

Best Practices for Handling Permissions in Flutter

To provide a better user experience, it’s essential to follow some best practices when handling permissions in Flutter:

• Always check permission status before performing any action that requires the permission. This ensures that your app doesn’t crash when the user denies the permission.
• Provide clear error messages to the user when permission is denied. This helps the user understand what’s happening and how to fix the issue.
• Request permissions only when necessary. Don’t request permissions that your app doesn’t need. This reduces the chances of the user denying the permission.
• Use the permission_handler package correctly. Make sure you’ve added the necessary permissions in the AndroidManifest.xml file (for Android) and the Info.plist file (for iOS).

Common Mistakes to Avoid

When handling permissions in Flutter, it’s essential to avoid some common mistakes:

1. Not checking permission status before performing any action that requires the permission. This can cause your app to crash when the user denies the permission.
2. Not providing clear error messages to the user when permission is denied. This can confuse the user and lead to negative reviews.
3. Requesting permissions that your app doesn’t need. This can lead to the user denying the permission, which can cause issues in your app.

Conclusion

In this comprehensive guide, we’ve explored the reasons behind app crashes when permission is denied from the app settings in Flutter. We’ve also provided step-by-step instructions to fix this issue and handle permission denial scenarios. By following the best practices and avoiding common mistakes, you can ensure that your Flutter app provides a seamless user experience even when the user denies permission.

Methods	Description
Permission.storage.request()	Requests the storage permission at runtime.
Permission.storage.status	Checks the permission status.
isDenied	Checks if the permission is denied.

By following the instructions in this guide, you can ensure that your Flutter app is robust and provides a great user experience even when the user denies permission.

Happy coding!

Last updated on: March 12, 2023

Frequently Asked Question

Are you struggling with your Flutter app crashing when a permission is denied from the app settings? Don’t worry, we’ve got you covered! Here are some frequently asked questions and answers to help you troubleshoot the issue.