.fvm/fvm_config.json

@@ -0,0 +1,3 @@
+{
+  "flutterSdkVersion": "stable"
+}

.gitignore

@@ -72,3 +72,4 @@ build/
 !**/ios/**/default.mode2v3
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
+flutter_sdk

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "dart.flutterSdkPath": "/Users/akufe/fvm/versions/stable"
+}

CHANGELOG.md

@@ -1,3 +1,5 @@
-## [0.0.1] - TODO: Add release date.
+## [0.1.0-nullsafety.0]
 
-* TODO: Describe initial release.
+## [0.0.1]
+
+* first release.

example/lib/main.dart

@@ -33,7 +33,7 @@ class MyApp extends StatelessWidget {
 }
 
 class MyHomePage extends StatefulWidget {
-  MyHomePage({Key key, this.title}) : super(key: key);
+  MyHomePage({Key? key, required this.title}) : super(key: key);
 
   // This widget is the home page of your application. It is stateful, meaning
   // that it has a State object (defined below) that contains fields that affect
@@ -51,20 +51,8 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
   String _char = '';
 
-  void _incrementCounter() {
-    setState(() {
-      // This call to setState tells the Flutter framework that something has
-      // changed in this State, which causes it to rerun the build method below
-      // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
-      // called again, and so nothing would appear to happen.
-      _counter++;
-    });
-  }
-
   @override
   Widget build(BuildContext context) {
     // This method is rerun every time setState is called, for instance as done
@@ -101,9 +89,7 @@ class _MyHomePageState extends State<MyHomePage> {
           children: <Widget>[
             Text(
               '$_char',
-              style: TextStyle(
-                fontSize: 30
-              ),
+              style: TextStyle(fontSize: 30),
             ),
             SizedBox(
               height: 10,
@@ -126,7 +112,7 @@ class _MyHomePageState extends State<MyHomePage> {
               child: Text('易经'),
               color: Colors.blue,
             ),
-             MaterialButton(
+            MaterialButton(
               onPressed: () {
                 setState(() {
                   _char = RandomCharacter.getEmoji(length: 5);
@@ -138,11 +124,6 @@ class _MyHomePageState extends State<MyHomePage> {
           ],
         ),
       ),
-      floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
-        child: Icon(Icons.add),
-      ), // This trailing comma makes auto-formatting nicer for build methods.
     );
   }
 }

example/pubspec.lock

@@ -7,56 +7,56 @@ packages:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.5.0-nullsafety.1"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0-nullsafety.1"
+    version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0-nullsafety.1"
+    version: "1.2.0"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0-nullsafety.1"
+    version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.15.0-nullsafety.3"
+    version: "1.15.0"
   cupertino_icons:
     dependency: "direct main"
     description:
       name: cupertino_icons
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.0.0"
+    version: "1.0.2"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0-nullsafety.1"
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -73,28 +73,28 @@ packages:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.10-nullsafety.1"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0-nullsafety.3"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0-nullsafety.1"
+    version: "1.8.0"
   random_character:
     dependency: "direct main"
     description:
       path: ".."
       relative: true
     source: path
-    version: "0.0.1"
+    version: "0.1.0-nullsafety.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -106,56 +106,56 @@ packages:
       name: source_span
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0-nullsafety.2"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.10.0-nullsafety.1"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0-nullsafety.1"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0-nullsafety.1"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0-nullsafety.1"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.19-nullsafety.2"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0-nullsafety.3"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.10.0-110 <2.11.0"
-  flutter: ">=1.17.0 <2.0.0"
+  dart: ">=2.12.0 <3.0.0"
+  flutter: ">=2.0.0"

example/pubspec.yaml

@@ -18,7 +18,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 version: 1.0.0+1
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
+  sdk: '>=2.12.0 <3.0.0'
 
 dependencies:
   flutter:
@@ -27,7 +27,7 @@ dependencies:
 
   # The following adds the Cupertino Icons font to your application.
   # Use with the CupertinoIcons class for iOS style icons.
-  cupertino_icons: ^1.0.0
+  cupertino_icons: ^1.0.2
   random_character: 
     path: ../
 

lib/chinese_character/random_chinese_charater.dart

@@ -1,121 +1,120 @@
 import 'dart:math';
 
 class RandomCharacter {
-  static String getChinese({int length}) {
+  static String getChinese({int length = 2}) {
     int max = 0x9FEF - 0x4e00 + 1;
     int base = 0x4e00;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getYijing({int length}) {
+  static String getYijing({int length = 2}) {
     int max = 0x4DE0 - 0x4DC0 + 1;
     int base = 0x4DC0;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getHiragana({int length}) {
+  static String getHiragana({int length = 2}) {
     int max = 0x3080 - 0x3040 + 1;
     int base = 0x3040;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getkatakana({int length}) {
+  static String getkatakana({int length = 2}) {
     int max = 0x30E0 - 0x30A0 + 1;
     int base = 0x30A0;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getJPCharacter({int length}) {
+  static String getJPCharacter({int length = 2}) {
     int max = 0x30E0 - 0x3040 + 1;
     int base = 0x3040;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getEmoji({int length}) {
+  static String getEmoji({int length = 2}) {
     int max = 0x1F64F - 0x1F601 + 1;
     int base = 0x1F601;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getNum({int length}) {
+  static String getNum({int length = 2}) {
     int max = 0x003A - 0x0030 + 1;
     int base = 0x0030;
     int r;
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       r = base + Random().nextInt(max);
       rc = rc + String.fromCharCode(r);
     }
     return rc;
   }
 
-  static String getENCharacter({int length}) {
+  static String getENCharacter({int length = 2}) {
     String _alphabet = 'qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM';
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       rc = rc + _alphabet[Random().nextInt(_alphabet.length)];
     }
     return rc;
   }
 
-  static String getLowerCase({int length}) {
+  static String getLowerCase({int length = 2}) {
     String _alphabet = 'qwertyuiopasdfghjklzxcvbnm';
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       rc = rc + _alphabet[Random().nextInt(_alphabet.length)];
     }
     return rc;
   }
 
-  static String getUpperCase({int length}) {
+  static String getUpperCase({int length = 2}) {
     String _alphabet = 'QWERTYUIOPASDFGHJKLZXCVBNM';
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       rc = rc + _alphabet[Random().nextInt(_alphabet.length)];
     }
     return rc;
   }
 
-  static String getCustom(String string, {int length}) {
-    assert(string != null);
+  static String getCustom(String string, {int length = 2}) {
     String rc = '';
-    for (var i = 0; i < length ?? 2; i++) {
+    for (var i = 0; i < length; i++) {
       rc = rc + string[Random().nextInt(string.length)];
     }
     return rc;

pubspec.lock

@@ -7,49 +7,49 @@ packages:
       name: async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.5.0-nullsafety.1"
+    version: "2.5.0"
   boolean_selector:
     dependency: transitive
     description:
       name: boolean_selector
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0-nullsafety.1"
+    version: "2.1.0"
   characters:
     dependency: transitive
     description:
       name: characters
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0-nullsafety.3"
+    version: "1.1.0"
   charcode:
     dependency: transitive
     description:
       name: charcode
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0-nullsafety.1"
+    version: "1.2.0"
   clock:
     dependency: transitive
     description:
       name: clock
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0-nullsafety.1"
+    version: "1.1.0"
   collection:
     dependency: transitive
     description:
       name: collection
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.15.0-nullsafety.3"
+    version: "1.15.0"
   fake_async:
     dependency: transitive
     description:
       name: fake_async
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0-nullsafety.1"
+    version: "1.2.0"
   flutter:
     dependency: "direct main"
     description: flutter
@@ -66,21 +66,21 @@ packages:
       name: matcher
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.12.10-nullsafety.1"
+    version: "0.12.10"
   meta:
     dependency: transitive
     description:
       name: meta
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0-nullsafety.3"
+    version: "1.3.0"
   path:
     dependency: transitive
     description:
       name: path
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0-nullsafety.1"
+    version: "1.8.0"
   sky_engine:
     dependency: transitive
     description: flutter
@@ -92,56 +92,56 @@ packages:
       name: source_span
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.8.0-nullsafety.2"
+    version: "1.8.0"
   stack_trace:
     dependency: transitive
     description:
       name: stack_trace
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.10.0-nullsafety.1"
+    version: "1.10.0"
   stream_channel:
     dependency: transitive
     description:
       name: stream_channel
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0-nullsafety.1"
+    version: "2.1.0"
   string_scanner:
     dependency: transitive
     description:
       name: string_scanner
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.1.0-nullsafety.1"
+    version: "1.1.0"
   term_glyph:
     dependency: transitive
     description:
       name: term_glyph
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.2.0-nullsafety.1"
+    version: "1.2.0"
   test_api:
     dependency: transitive
     description:
       name: test_api
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "0.2.19-nullsafety.2"
+    version: "0.2.19"
   typed_data:
     dependency: transitive
     description:
       name: typed_data
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "1.3.0-nullsafety.3"
+    version: "1.3.0"
   vector_math:
     dependency: transitive
     description:
       name: vector_math
       url: "https://pub.flutter-io.cn"
     source: hosted
-    version: "2.1.0-nullsafety.3"
+    version: "2.1.0"
 sdks:
-  dart: ">=2.10.0-110 <2.11.0"
-  flutter: ">=1.17.0 <2.0.0"
+  dart: ">=2.12.0 <3.0.0"
+  flutter: ">=2.0.0"

pubspec.yaml

@@ -1,11 +1,11 @@
 name: random_character
-description: A new Flutter package.
-version: 0.0.1
+description: a random character generator.
+version: 0.1.0-nullsafety.0
 homepage: https://github.com/meng-fucius/random_character
 
 environment:
-  sdk: ">=2.7.0 <3.0.0"
-  flutter: ">=1.17.0 <2.0.0"
+  sdk: ">=2.12.0 <3.0.0"
+  flutter: ">=2.0.0"
 
 dependencies:
   flutter:
@@ -20,7 +20,6 @@ dev_dependencies:
 
 # The following section is specific to Flutter.
 flutter:
-
   # To add assets to your package, add an assets section, like this:
   # assets:
   #   - images/a_dot_burr.jpeg
@@ -31,7 +30,6 @@ flutter:
   #
   # An image asset can refer to one or more resolution-specific "variants", see
   # https://flutter.dev/assets-and-images/#resolution-aware.
-
   # To add custom fonts to your package, add a fonts section here,
   # in this "flutter" section. Each entry in this list should have a
   # "family" key with the font family name, and a "fonts" key with a