Improve text input behavior: append recognition results to text field

- Change from replacing current text to appending final results
- Distinguish between real-time results (display only) and final results (append to text)
- Add proper spacing between appended text segments
- Maintain history of individual recognition segments
- Clear current text when starting new recording session

example/lib/main.dart

@@ -15,7 +15,7 @@ class MyApp extends StatelessWidget {
       title: 'YX ASR Example',
       theme: ThemeData(
         colorScheme: ColorScheme.fromSeed(seedColor: Colors.blue),
-        useMaterial3: true,
+        useMaterial3: false, // 暂时禁用Material 3以避免着色器编译问题
       ),
       home: const SpeechRecognitionPage(),
     );
@@ -95,8 +95,6 @@ class _SpeechRecognitionPageState extends State<SpeechRecognitionPage> {
             if (result.recognizedWords.isNotEmpty) {
               print('📱 [Example] 实时识别: ${result.recognizedWords}');
               _currentText = result.recognizedWords;
-              // 更新文本框显示
-              _updateTextController();
             }
           });
         });
@@ -534,12 +532,22 @@ class _SpeechRecognitionPageState extends State<SpeechRecognitionPage> {
         print(
             '📱 [Example] RecordingButton 接收到识别结果: "${result.recognizedWords}"');
         setState(() {
-          // 更新当前识别的文本（实时显示）
           if (result.recognizedWords.isNotEmpty) {
-            print('📱 [Example] 实时识别: ${result.recognizedWords}');
-            _currentText = result.recognizedWords;
-            // 更新文本框显示
-            _updateTextController();
+            if (result.finalResult) {
+              // 最终结果：追加到文本框
+              print('📱 [Example] 最终识别结果，追加到文本框: ${result.recognizedWords}');
+              String currentTextInBox = _textController.text;
+              if (currentTextInBox.isNotEmpty &&
+                  !currentTextInBox.endsWith(' ')) {
+                currentTextInBox += ' '; // 添加空格分隔
+              }
+              _textController.text = currentTextInBox + result.recognizedWords;
+              _currentText = result.recognizedWords; // 保存当前识别结果
+            } else {
+              // 实时结果：仅用于显示，不追加到文本框
+              print('📱 [Example] 实时识别: ${result.recognizedWords}');
+              _currentText = result.recognizedWords;
+            }
           }
         });
       },
@@ -555,7 +563,7 @@ class _SpeechRecognitionPageState extends State<SpeechRecognitionPage> {
         });
 
         if (!isListening) {
-          // 录音结束后，将当前识别的文本保存到历史记录
+          // 录音结束后，将当前识别结果保存到历史记录（如果有的话）
           if (_currentText.isNotEmpty) {
             setState(() {
               _recognitionHistory.insert(0, _currentText);
@@ -566,9 +574,10 @@ class _SpeechRecognitionPageState extends State<SpeechRecognitionPage> {
             });
           }
         } else {
-          // 开始录音时清空之前的结果
+          // 开始录音时清空实时结果缓存
           setState(() {
             _realtimeResults.clear();
+            _currentText = ''; // 清空当前识别文本
           });
         }
       },