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Request Storage Permission in Flutter

 How to Request Storage Permission in Flutter


Storage permission is needed when we want the user's device to access the media or files and to perform required actions or work efficiently.
In Flutter we can implement this using Storage Permission and asking user to enable the storage permission at run time.


Flutter Packages required is: Permission Handler
You can find these packages on pub.dev site. 


Source Code:

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

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

class MyApp extends StatefulWidget {
  @override
  _MyAppState createState() => _MyAppState();
}

class _MyAppState extends State<MyApp> {
  Future<int> storagePermissionChecker;

  Future<int> checkStoragePermission() async {
    final result = await PermissionHandler()
        .checkPermissionStatus(PermissionGroup.storage);
    setState(() {});
    if (result.toString() == "PermissionStatus.granted") {
      return 1;
    }
    storagePermissionChecker = requestStoragePermission();
    setState(() {});

    return 0;
  }

  Future<int> requestStoragePermission() async {
    Map<PermissionGroup, PermissionStatus> result =
        await PermissionHandler().requestPermissions([PermissionGroup.storage]);
    return result[PermissionGroup.storage].toString() ==
            "PermissionStatus.granted"
        ? 1
        : 0;
  }

  @override
  void initState() {
    // TODO: implement initState
    super.initState();
    storagePermissionChecker = (() async {
      return await checkStoragePermission();
    })();
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: FutureBuilder(
        future: storagePermissionChecker,
        builder: (context, status) {
          if (status.connectionState == ConnectionState.done) {
            if (status.hasData) {
              if (status.data == 1) {
                return MyHome();
              } else {
                return Scaffold(
                  body: Center(
                    child: RaisedButton(
                      color: Colors.teal,
                      child: Text(
                        "Allow storage Permission",
                        style: TextStyle(color: Colors.white, fontSize: 18),
                      ),
                      onPressed: () {
                        storagePermissionChecker = checkStoragePermission();

                        setState(() {});
                      },
                    ),
                  ),
                );
              }
            } else {
              return Scaffold(
                  body: Center(
                child: Text(
                    'Something went wrong.. Please uninstall and Install Again'),
              ));
            }
          } else {
            return Scaffold(body: Center(child: CircularProgressIndicator()));
          }
        },
      ),
    );
  }
}

class MyHome extends StatefulWidget {
  @override
  _MyHomeState createState() => _MyHomeState();
}

class _MyHomeState extends State<MyHome> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(child: Text('Hello')),
    );
  }
}


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