How To Ask For Permission Using Flutter Android App

dependencies:
  flutter:
    sdk: flutter
  permission_handler: ^3.0.1

flutter pub get

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(
        title: "Test App",
        home: HomePage(),
    );
  }
}

class HomePage extends StatefulWidget{
  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  @override
  Widget build(BuildContext context) {
    return Scaffold( 
      appBar: AppBar( 
         title: Text("Request Permission"),
         backgroundColor: Colors.redAccent,
      ),
      body: Container( 
        alignment: Alignment.center,
        padding: EdgeInsets.all(20),
         child: Column(
           children: [
               Container( 
                 child: ElevatedButton( 
                   child: Text("Request Single Permission"),
                   onPressed: () async {
                     if (await Permission.location.request().isGranted) {
                           // Either the permission was already granted before or the user just granted it.
                           print("Location Permission is granted");
                      }else{
                          print("Location Permission is denied.");
                      }
                   },
                 ),
               ),

               Container( 
                 child: ElevatedButton( 
                   child: Text("Request Multiple Permission"),
                   onPressed: () async {
                      // You can request multiple permissions at once.
                      Map<Permission, PermissionStatus> statuses = await [
                        Permission.location, 
                        Permission.camera,
                        //add more permission to request here.
                      ].request();
                     
                      if(statuses[Permission.location].isDenied){ //check each permission status after.
                          print("Location permission is denied.");
                      }

                      if(statuses[Permission.camera].isDenied){ //check each permission status after.
                          print("Camera permission is denied.");
                      }
                   },
                 ),
               ),

               Container( 
                 child: ElevatedButton( 
                   child: Text("Check Camera Permission"),
                   onPressed: () async {
                    //check permission without request popup
                      var status = await Permission.camera.status;
                      if (status.isDenied) {
                        // We didn't ask for permission yet or the permission has been denied before but not permanently.
                        print("Permission is denined.");
                      }else if(status.isGranted){
                        //permission is already granted.
                        print("Permission is already granted.");
                      }else if(status.isPermanentlyDenied){
                        //permission is permanently denied.
                        print("Permission is permanently denied");
                      }else if(status.isRestricted){
                        //permission is OS restricted.
                        print("Permission is OS restricted.");
                      }
                   },
                 ),
               )
           ],
         ),
      )
    );
  }
}