[file_selector] Remove custom analysis options

Switches to the new repo-standard analysis options, and fixes all
violations.

Part of flutter/flutter#76229

packages/file_selector/file_selector/example/lib/get_directory_page.dart

@@ -7,26 +7,26 @@ import 'package:flutter/material.dart';
 
 /// Screen that shows an example of getDirectoryPath
 class GetDirectoryPage extends StatelessWidget {
-  void _getDirectoryPath(BuildContext context) async {
-    final String confirmButtonText = 'Choose';
+  Future<void> _getDirectoryPath(BuildContext context) async {
+    const String confirmButtonText = 'Choose';
     final String? directoryPath = await getDirectoryPath(
       confirmButtonText: confirmButtonText,
     );
     if (directoryPath == null) {
       // Operation was canceled by the user.
       return;
     }
-    await showDialog(
+    await showDialog<void>(
       context: context,
-      builder: (context) => TextDisplay(directoryPath),
+      builder: (BuildContext context) => TextDisplay(directoryPath),
     );
   }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Open a text file"),
+        title: const Text('Open a text file'),
       ),
       body: Center(
         child: Column(
@@ -37,7 +37,7 @@ class GetDirectoryPage extends StatelessWidget {
                 primary: Colors.blue,
                 onPrimary: Colors.white,
               ),
-              child: Text('Press to ask user to choose a directory'),
+              child: const Text('Press to ask user to choose a directory'),
               onPressed: () => _getDirectoryPath(context),
             ),
           ],
@@ -49,22 +49,22 @@ class GetDirectoryPage extends StatelessWidget {
 
 /// Widget that displays a text file in a dialog
 class TextDisplay extends StatelessWidget {
+  /// Default Constructor
+  const TextDisplay(this.directoryPath);
+
   /// Directory path
   final String directoryPath;
 
-  /// Default Constructor
-  TextDisplay(this.directoryPath);
-
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
-      title: Text('Selected Directory'),
+      title: const Text('Selected Directory'),
       content: Scrollbar(
         child: SingleChildScrollView(
           child: Text(directoryPath),
         ),
       ),
-      actions: [
+      actions: <Widget>[
         TextButton(
           child: const Text('Close'),
           onPressed: () => Navigator.pop(context),

packages/file_selector/file_selector/example/lib/home_page.dart

@@ -14,39 +14,39 @@ class HomePage extends StatelessWidget {
     );
     return Scaffold(
       appBar: AppBar(
-        title: Text('File Selector Demo Home Page'),
+        title: const Text('File Selector Demo Home Page'),
       ),
       body: Center(
         child: Column(
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             ElevatedButton(
               style: style,
-              child: Text('Open a text file'),
+              child: const Text('Open a text file'),
               onPressed: () => Navigator.pushNamed(context, '/open/text'),
             ),
-            SizedBox(height: 10),
+            const SizedBox(height: 10),
             ElevatedButton(
               style: style,
-              child: Text('Open an image'),
+              child: const Text('Open an image'),
               onPressed: () => Navigator.pushNamed(context, '/open/image'),
             ),
-            SizedBox(height: 10),
+            const SizedBox(height: 10),
             ElevatedButton(
               style: style,
-              child: Text('Open multiple images'),
+              child: const Text('Open multiple images'),
               onPressed: () => Navigator.pushNamed(context, '/open/images'),
             ),
-            SizedBox(height: 10),
+            const SizedBox(height: 10),
             ElevatedButton(
               style: style,
-              child: Text('Save a file'),
+              child: const Text('Save a file'),
               onPressed: () => Navigator.pushNamed(context, '/save/text'),
             ),
-            SizedBox(height: 10),
+            const SizedBox(height: 10),
             ElevatedButton(
               style: style,
-              child: Text('Open a get directory dialog'),
+              child: const Text('Open a get directory dialog'),
               onPressed: () => Navigator.pushNamed(context, '/directory'),
             ),
           ],

packages/file_selector/file_selector/example/lib/main.dart

@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'package:flutter/material.dart';
-import 'package:example/home_page.dart';
 import 'package:example/get_directory_page.dart';
-import 'package:example/open_text_page.dart';
+import 'package:example/home_page.dart';
 import 'package:example/open_image_page.dart';
 import 'package:example/open_multiple_images_page.dart';
+import 'package:example/open_text_page.dart';
 import 'package:example/save_text_page.dart';
+import 'package:flutter/material.dart';
 
 void main() {
   runApp(MyApp());
@@ -25,12 +25,12 @@ class MyApp extends StatelessWidget {
         visualDensity: VisualDensity.adaptivePlatformDensity,
       ),
       home: HomePage(),
-      routes: {
-        '/open/image': (context) => OpenImagePage(),
-        '/open/images': (context) => OpenMultipleImagesPage(),
-        '/open/text': (context) => OpenTextPage(),
-        '/save/text': (context) => SaveTextPage(),
-        '/directory': (context) => GetDirectoryPage(),
+      routes: <String, WidgetBuilder>{
+        '/open/image': (BuildContext context) => OpenImagePage(),
+        '/open/images': (BuildContext context) => OpenMultipleImagesPage(),
+        '/open/text': (BuildContext context) => OpenTextPage(),
+        '/save/text': (BuildContext context) => SaveTextPage(),
+        '/directory': (BuildContext context) => GetDirectoryPage(),
       },
     );
   }

packages/file_selector/file_selector/example/lib/open_image_page.dart

@@ -3,18 +3,20 @@
 // found in the LICENSE file.
 
 import 'dart:io';
-import 'package:flutter/foundation.dart';
+
 import 'package:file_selector/file_selector.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 /// Screen that shows an example of openFiles
 class OpenImagePage extends StatelessWidget {
-  void _openImageFile(BuildContext context) async {
+  Future<void> _openImageFile(BuildContext context) async {
     final XTypeGroup typeGroup = XTypeGroup(
       label: 'images',
-      extensions: ['jpg', 'png'],
+      extensions: <String>['jpg', 'png'],
     );
-    final List<XFile> files = await openFiles(acceptedTypeGroups: [typeGroup]);
+    final List<XFile> files =
+        await openFiles(acceptedTypeGroups: <XTypeGroup>[typeGroup]);
     if (files.isEmpty) {
       // Operation was canceled by the user.
       return;
@@ -23,17 +25,17 @@ class OpenImagePage extends StatelessWidget {
     final String fileName = file.name;
     final String filePath = file.path;
 
-    await showDialog(
+    await showDialog<void>(
       context: context,
-      builder: (context) => ImageDisplay(fileName, filePath),
+      builder: (BuildContext context) => ImageDisplay(fileName, filePath),
     );
   }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Open an image"),
+        title: const Text('Open an image'),
       ),
       body: Center(
         child: Column(
@@ -44,7 +46,7 @@ class OpenImagePage extends StatelessWidget {
                 primary: Colors.blue,
                 onPrimary: Colors.white,
               ),
-              child: Text('Press to open an image file(png, jpg)'),
+              child: const Text('Press to open an image file(png, jpg)'),
               onPressed: () => _openImageFile(context),
             ),
           ],
@@ -56,23 +58,23 @@ class OpenImagePage extends StatelessWidget {
 
 /// Widget that displays a text file in a dialog
 class ImageDisplay extends StatelessWidget {
+  /// Default Constructor
+  const ImageDisplay(this.fileName, this.filePath);
+
   /// Image's name
   final String fileName;
 
   /// Image's path
   final String filePath;
 
-  /// Default Constructor
-  ImageDisplay(this.fileName, this.filePath);
-
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
       title: Text(fileName),
       // On web the filePath is a blob url
       // while on other platforms it is a system path.
       content: kIsWeb ? Image.network(filePath) : Image.file(File(filePath)),
-      actions: [
+      actions: <Widget>[
         TextButton(
           child: const Text('Close'),
           onPressed: () {

packages/file_selector/file_selector/example/lib/open_multiple_images_page.dart

@@ -3,40 +3,41 @@
 // found in the LICENSE file.
 
 import 'dart:io';
-import 'package:flutter/foundation.dart';
+
 import 'package:file_selector/file_selector.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 
 /// Screen that shows an example of openFiles
 class OpenMultipleImagesPage extends StatelessWidget {
-  void _openImageFile(BuildContext context) async {
+  Future<void> _openImageFile(BuildContext context) async {
     final XTypeGroup jpgsTypeGroup = XTypeGroup(
       label: 'JPEGs',
-      extensions: ['jpg', 'jpeg'],
+      extensions: <String>['jpg', 'jpeg'],
     );
     final XTypeGroup pngTypeGroup = XTypeGroup(
       label: 'PNGs',
-      extensions: ['png'],
+      extensions: <String>['png'],
     );
-    final List<XFile> files = await openFiles(acceptedTypeGroups: [
+    final List<XFile> files = await openFiles(acceptedTypeGroups: <XTypeGroup>[
       jpgsTypeGroup,
       pngTypeGroup,
     ]);
     if (files.isEmpty) {
       // Operation was canceled by the user.
       return;
     }
-    await showDialog(
+    await showDialog<void>(
       context: context,
-      builder: (context) => MultipleImagesDisplay(files),
+      builder: (BuildContext context) => MultipleImagesDisplay(files),
     );
   }
 
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
-        title: Text("Open multiple images"),
+        title: const Text('Open multiple images'),
       ),
       body: Center(
         child: Column(
@@ -47,7 +48,7 @@ class OpenMultipleImagesPage extends StatelessWidget {
                 primary: Colors.blue,
                 onPrimary: Colors.white,
               ),
-              child: Text('Press to open multiple images (png, jpg)'),
+              child: const Text('Press to open multiple images (png, jpg)'),
               onPressed: () => _openImageFile(context),
             ),
           ],
@@ -59,31 +60,31 @@ class OpenMultipleImagesPage extends StatelessWidget {
 
 /// Widget that displays a text file in a dialog
 class MultipleImagesDisplay extends StatelessWidget {
+  /// Default Constructor
+  const MultipleImagesDisplay(this.files);
+
   /// The files containing the images
   final List<XFile> files;
 
-  /// Default Constructor
-  MultipleImagesDisplay(this.files);
-
   @override
   Widget build(BuildContext context) {
     return AlertDialog(
-      title: Text('Gallery'),
+      title: const Text('Gallery'),
       // On web the filePath is a blob url
       // while on other platforms it is a system path.
       content: Center(
         child: Row(
           children: <Widget>[
             ...files.map(
-              (file) => Flexible(
+              (XFile file) => Flexible(
                   child: kIsWeb
                       ? Image.network(file.path)
                       : Image.file(File(file.path))),
             )
           ],
         ),
       ),
-      actions: [
+      actions: <Widget>[
         TextButton(
           child: const Text('Close'),
           onPressed: () {