applied dart fix and updated flutter versions

.github/workflows/flutter-codestyle.yml

@@ -20,10 +20,10 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Install Flutter 2.8.1
+    - name: Install Flutter 3.22.2
       uses: subosito/flutter-action@v2
       with:
-        flutter-version: 2.8.1
+        flutter-version: 3.22.2
 
     - name: Run Binding Analyzer
       run: flutter analyze --no-fatal-infos --no-fatal-warnings

.github/workflows/flutter-demos.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        flutter-version: ['2.8.1', '3.0.4']
+        flutter-version: ['3.3.0', '3.22.2']
 
     steps:
     - uses: actions/checkout@v3
@@ -52,10 +52,10 @@ jobs:
 
   build-ios:
     name: Build iOS demo
-    runs-on: macos-11
+    runs-on: macos-12
     strategy:
       matrix:
-        flutter-version: ['2.8.1', '3.0.4']
+        flutter-version: ['3.3.0', '3.22.2']
 
     steps:
     - uses: actions/checkout@v3

demo/flutter/integration_test/app_test.dart

@@ -43,17 +43,17 @@ void main() {
         String keyword = testData['tests']['singleKeyword'][t]['wakeword'];
 
         String keywordPath =
-            "assets/test_resources/keyword_files/${keyword}_${platform}.ppn";
+            "assets/test_resources/keyword_files/${keyword}_$platform.ppn";
         String modelPath =
-            "assets/test_resources/model_files/porcupine_params${language != "en" ? "_${language}" : ""}.pv";
+            "assets/test_resources/model_files/porcupine_params${language != "en" ? "_$language" : ""}.pv";
 
         Porcupine porcupine;
         try {
           porcupine = await Porcupine.fromKeywordPaths(accessKey, [keywordPath],
               modelPath: modelPath);
         } on PorcupineException catch (ex) {
           expect(ex, equals(null),
-              reason: "Failed to initialize Porcupine for ${language}: ${ex}");
+              reason: "Failed to initialize Porcupine for $language: $ex");
           return;
         }
 
@@ -74,10 +74,10 @@ void main() {
         porcupine.delete();
         expect(detections.length, equals(1),
             reason:
-                "Number of detections for ${language} ${keyword} was incorrect");
+                "Number of detections for $language $keyword was incorrect");
         expect(detections[0], equals(0),
             reason:
-                "Porcupine returned wrong keyword index for ${language} ${keyword}");
+                "Porcupine returned wrong keyword index for $language $keyword");
       }
     });
 
@@ -90,23 +90,23 @@ void main() {
             testData['tests']['multipleKeyword'][t]['groundTruth']);
 
         List<String> keywordPaths = keywords.map((keyword) {
-          return "assets/test_resources/keyword_files/${keyword}_${platform}.ppn";
+          return "assets/test_resources/keyword_files/${keyword}_$platform.ppn";
         }).toList();
         String modelPath =
-            "assets/test_resources/model_files/porcupine_params${language != "en" ? "_${language}" : ""}.pv";
+            "assets/test_resources/model_files/porcupine_params${language != "en" ? "_$language" : ""}.pv";
 
         Porcupine porcupine;
         try {
           porcupine = await Porcupine.fromKeywordPaths(accessKey, keywordPaths,
               modelPath: modelPath);
         } on PorcupineException catch (ex) {
           expect(ex, equals(null),
-              reason: "Failed to initialize Porcupine for ${language}: ${ex}");
+              reason: "Failed to initialize Porcupine for $language: $ex");
           return;
         }
 
         String audioPath =
-            "assets/test_resources/audio_samples/multiple_keywords${language != "en" ? "_${language}" : ""}.wav";
+            "assets/test_resources/audio_samples/multiple_keywords${language != "en" ? "_$language" : ""}.wav";
         List<int> pcm = await loadAudioFile(audioPath);
 
         List<int> detections = [];
@@ -121,9 +121,9 @@ void main() {
 
         porcupine.delete();
         expect(detections.length, equals(groundTruth.length),
-            reason: "Number of detections for ${language} was incorrect");
+            reason: "Number of detections for $language was incorrect");
         expect(detections, equals(groundTruth),
-            reason: "Porcupine detections don't match truth for ${language}");
+            reason: "Porcupine detections don't match truth for $language");
       }
     });
   });

demo/flutter/lib/main.dart

@@ -14,7 +14,7 @@ import 'package:flutter/material.dart';
 import 'dart:async';
 import 'dart:convert';
 
-import 'package:flutter_picker/flutter_picker.dart';
+import 'package:bottom_picker/bottom_picker.dart';
 import 'package:porcupine_flutter/porcupine.dart';
 import 'package:porcupine_flutter/porcupine_manager.dart';
 import 'package:porcupine_flutter/porcupine_error.dart';
@@ -56,15 +56,15 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
       isButtonDisabled = true;
       backgroundColour = defaultColour;
     });
-    WidgetsBinding.instance?.addObserver(this);
+    WidgetsBinding.instance.addObserver(this);
 
     _initializeKeywordMap();
     _loadParams();
   }
 
   @override
   void dispose() {
-    WidgetsBinding.instance?.removeObserver(this);
+    WidgetsBinding.instance.removeObserver(this);
     super.dispose();
   }
 
@@ -278,7 +278,7 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
 
   buildStartButton(BuildContext context) {
     final ButtonStyle buttonStyle = ElevatedButton.styleFrom(
-        primary: picoBlue,
+        backgroundColor: picoBlue,
         shape: CircleBorder(),
         textStyle: TextStyle(color: Colors.white));
 
@@ -327,14 +327,23 @@ class _MyAppState extends State<MyApp> with WidgetsBindingObserver {
           )));
 
   showPicker(BuildContext context) {
-    Picker picker = Picker(
-        adapter: PickerDataAdapter<String>(pickerData: _keywords.toList()),
-        changeToFirst: true,
-        textAlign: TextAlign.left,
-        columnPadding: const EdgeInsets.all(8.0),
-        onConfirm: (Picker picker, List value) {
-          loadNewKeyword(picker.getSelectedValues()[0]);
-        });
-    picker.show(_scaffoldKey.currentState!);
+    BottomPicker picker = BottomPicker(
+        pickerTitle: Text(
+          "Choose a keyword",
+          style: TextStyle(
+            fontWeight: FontWeight.bold,
+            fontSize:  15)),
+        titleAlignment: Alignment.topCenter,
+        gradientColors: [
+          picoBlue, picoBlue
+        ],
+        items: _keywords.toList().map((x) => Center(
+          child: Text(x)
+        )).toList(),
+        onSubmit: (index) {
+          loadNewKeyword(_keywords[index]);
+        },
+    );
+    picker.show(_scaffoldKey.currentContext!);
   }
 }

demo/flutter/pubspec.yaml

@@ -6,14 +6,14 @@ publish_to: 'none'
 version: 1.0.0
 
 environment:
-  sdk: ">=2.15.0 <4.0.0"
-  flutter: ">=2.8.1"
+  sdk: ">=2.18.0 <4.0.0"
+  flutter: ">=3.3.0"
 
 dependencies:
   flutter:
     sdk: flutter
 
-  flutter_picker: ^2.0.1
+  bottom_picker: ^2.7.0
   porcupine_flutter: ^3.0.3
   path: ^1.8.0
 

demo/flutter/scripts/prepare_demo.dart

@@ -62,7 +62,7 @@ void main(List<String> arguments) async {
   }
   modelDir.createSync(recursive: true);
 
-  var params = Map();
+  var params = {};
   params["language"] = language;
   params["keywords"] = [];